西叉的代码屋

20250916144004

Tue, 16 Sep 2025 22:40:35 +0800

个性化的阿里云OSS图床

下载并安装ossutil2.0 ，并安装官方文档配置好必要的参数

根据自身情况修改下面这个脚本

Linux/MacOS版

base_url=https://cx-picture.example.com
bucket=cx-picture
year=$(date +%Y)
month=$(date +%m)
day=$(date +%d)
file_path="'"$1"'"
remote_path=$year/$month/$day/$(date +%s).${file_path##*.}
# sudo mkdir /var/log/cxputil && sudo chmod 777 /var/log/cxputil
log_path=/var/log/cxputil/$year$month.log
[[ -z "$file_path" ]] && { echo "用法: $0 <文件路径>"; exit 1; }
[[ ! -f "$file_path" ]] && { echo "错误: 文件不存在 '$file_path'"; exit 1; }
[[ "$file_path" =~ \.(jpg|jpeg|png|gif|bmp|tiff|tif|webp|svg|ico|heic|raw)$ ]] || { echo "错误: $filename 不是支持的图片格式"; exit 1; }
cmd="ossutil cp $1 oss://$bucket/$remote_path"
echo $cmd
$cmd >> $log_path
echo "Upload Success:"
echo "$base_url/$remote_path"

Windows版本

开发中

在typora中配置上传命令

Post202509161428

Tue, 16 Sep 2025 22:30:46 +0800

My First Post

Sat, 22 Mar 2025 20:00:42 +0800

Azure入门指南（一）

Sun, 18 Jun 2023 12:25:00 +0000

注册

注册一个微软账户即可，具体步骤可以参考知乎的这篇文章（如何白嫖微软Azure12个月及避坑指南 - 知乎 (zhihu.com)），

注意：这篇文章写了有很久了，azure的策略可能已经更改，由此可能产生费用，大家实践的时候一定要看清收费策略，或者提前咨询客服，避免不必要的损失。

Azure服务

以下是常用的azure服务：

以下表格是Azure、阿里云和AWS的云服务的对应关系

Azure	阿里云	AWS
订阅（Subscriptions）
资源组（Resource groups）	资源组
虚拟机（Virtual machine）	云服务器ECS	EC2
磁盘（Disk）	云盘	卷（Volume）
虚拟网络（Virtual network）	专有网络	VPC
网络接口（Network Interface）	交换机	网络接口（Network interface）
网络安全组（Network security group）	安全组	安全组（Security Group）
公共 IP 地址（Public IP address）	公网IP	公有 IPv4 /IPv6地址（Public IPv4/IPv6 address）
SSH 密钥（SSH key）	密钥对	密钥对（Key Pair）

虚拟机

创建

基本

Debian-Ubuntu使用Nexus的私有镜像源

Thu, 27 Oct 2022 15:24:18 +0000

以Debian11为例

修改**/etc/apt/source.list**

vim /etc/apt/source.list

# deb cdrom:[Debian GNU/Linux 11.2.0 _Bullseye_ - Official amd64 DVD Binary-1 20211218-11:13]/ bullseye contrib main

#deb cdrom:[Debian GNU/Linux 11.2.0 _Bullseye_ - Official amd64 DVD Binary-1 20211218-11:13]/ bullseye contrib main

deb http://deb.debian.org/debian/ bullseye main
deb-src http://deb.debian.org/debian/ bullseye main

deb http://security.debian.org/debian-security bullseye-security main contrib
deb-src http://security.debian.org/debian-security bullseye-security main contrib

# bullseye-updates, to get updates before a point release is made;
# see https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_updates_and_backports
deb http://deb.debian.org/debian/ bullseye-updates main contrib
deb-src http://deb.debian.org/debian/ bullseye-updates main contrib

把其中的地址替换成你的私有镜像源地址

mybatis xml的字符串表达式中不要包含in（因为in是关键字，除此之外，还有很多关键字都不要放在这里）！！！

Tue, 11 Oct 2022 15:09:00 +0000

正确的做法是把Query类的in变量名改成其它名字，比如改成contains <if test="null != query.contains"></if>（正确）

群晖Gitlab开启https

Fri, 07 Oct 2022 14:06:00 +0000

2.打开docker，右键编辑synology_gitlab，在端口设置中将本地端口44333（自定义），映射到容器端口443，然后在环境变量中新增GITLAB_HTTPS true 完成以上步骤后，重启Gitlab，就可以在浏览器上使用https访问Gitlab了。但是当使用克隆代码时，仍然是使用原来的端口。 3.在环境变量中修改GITLAB_PORT的值为44333（自定义）然后重启Gitlab就完事了。

MySQL8.0主从同步

Fri, 09 Sep 2022 09:51:29 +0000

参考：https://www.cnblogs.com/kylinlin/p/5258719.html

一、主数据库

1.修改配置文件

vim /etc/mysql/mysql.conf.d/mysqld.cnf

[mysqld]

log-bin=mysql-bin

server-id=1

2.锁表

mysql > flush tables with read lock;

3.备份

mysqldump -u root -p 'root' -S /var/run/mysqld/mysqld.sock kpc | gzip > /tmp/mysql_bak.$(date +%F).sql.gz

4.创建用户并授权

CREATE USER 'rep'@'%' IDENTIFIED WITH mysql_native_password BY 'rep';

GRANT REPLICATION SLAVE ON *.* TO 'rep'@'%';

5.记录信息

mysql > show master status;

6.重启

sudo systemctl restart mysql

二、从数据库

1.修改配置文件

vim /etc/mysql/mysql.conf.d/mysqld.cnf

[server-id != 1](# 1.修改配置文件)

[mysqld]

server-id=2

2.配置Master

[MASTER_USER](# 4.创建用户)

[MASTER_PASSWORD](# 4.创建用户)

[MASTER_LOG_FILE](# 5.记录信息)

[MASTER_LOG_POS](# 5.记录信息)

mysql> CHANGE MASTER TO

-> MASTER_HOST='master_host_name',

-> MASTER_USER='rep',

-> MASTER_PASSWORD='rep',

-> MASTER_LOG_FILE='mysql-bin.000001',

-> MASTER_LOG_POS=156

3.运行

mysql > start slave;

Spring Cloud Alibaba 2021.0.1.0 踩坑记录

Sun, 04 Sep 2022 15:27:00 +0000

事情是这样的，跟往常一样，我先去Spring官网找到Spring Cloud Alibaba的最新的版本号，如下图所示：

可以看到最新的版本是2021.0.1.0

我默默记下这个版本号… 然后点了右上角的那只章鱼猫 在Wiki里找到版本说明，如下图所示：现在我知道了Spring Cloud Alibaba Version、Spring Cloud Version和Spring Boot Version三者版本对应关系了！

我再次回到Spring官网，然后打开Spring Cloud Alibaba的Reference，根据文档，一顿操作。其实大概就只有三步：

添加依赖

<!--在父工程添加以下依赖-->
<properties>
        <spring.cloud.version>2021.0.1</spring.cloud.version>
        <spring-boot-dependencies.version>2.6.3</spring-boot-dependencies.version>
        <com.alibaba.cloud.spring-cloud-alibaba-dependencies.version>2021.0.1.0
        </com.alibaba.cloud.spring-cloud-alibaba-dependencies.version>
</properties>
<dependencyManagement>
        <dependencies>
            <!--官网里使用spring-boot-starter-parent作为父工程而没有导入这条依赖，实际作用相同-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot-dependencies.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring.cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${com.alibaba.cloud.spring-cloud-alibaba-dependencies.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
</dependencyManagement>

<!--在module中添加以下依赖-->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>

配置yaml

spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

在主类上添加**@EnableDiscoveryClient**注解激动的心，颤抖的手，点击运行！（提前启动好了Nacos）

2022-09-05 00:04:32.047  INFO 37828 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2022-09-05 00:04:32.047  INFO 37828 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.56]
2022-09-05 00:04:32.109  INFO 37828 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2022-09-05 00:04:32.109  INFO 37828 --- [  restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1320 ms
2022-09-05 00:04:32.504  WARN 37828 --- [  restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageConverters' defined in class path resource [org/springframework/boot/autoconfigure/http/HttpMessageConvertersAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.autoconfigure.http.HttpMessageConverters]: Factory method 'messageConverters' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mappingJackson2HttpMessageConverter' defined in class path resource [org/springframework/boot/autoconfigure/http/JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration.class]: Unsatisfied dependency expressed through method 'mappingJackson2HttpMessageConverter' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@2437c6dc]
2022-09-05 00:04:32.507  INFO 37828 --- [  restartedMain] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2022-09-05 00:04:32.523  INFO 37828 --- [  restartedMain] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-09-05 00:04:32.551 ERROR 37828 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageConverters' defined in class path resource [org/springframework/boot/autoconfigure/http/HttpMessageConvertersAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.autoconfigure.http.HttpMessageConverters]: Factory method 'messageConverters' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mappingJackson2HttpMessageConverter' defined in class path resource [org/springframework/boot/autoconfigure/http/JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration.class]: Unsatisfied dependency expressed through method 'mappingJackson2HttpMessageConverter' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@2437c6dc]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:953) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.15.jar:5.3.15]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.15.jar:5.3.15]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.3.jar:2.6.3]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:732) ~[spring-boot-2.6.3.jar:2.6.3]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:414) ~[spring-boot-2.6.3.jar:2.6.3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:302) ~[spring-boot-2.6.3.jar:2.6.3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) ~[spring-boot-2.6.3.jar:2.6.3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) ~[spring-boot-2.6.3.jar:2.6.3]
	at cn.imcaoxuan.FileManagerApplication.main(FileManagerApplication.java:11) ~[classes/:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.6.3.jar:2.6.3]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageConverters' defined in class path resource [org/springframework/boot/autoconfigure/http/HttpMessageConvertersAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.autoconfigure.http.HttpMessageConverters]: Factory method 'messageConverters' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mappingJackson2HttpMessageConverter' defined in class path resource [org/springframework/boot/autoconfigure/http/JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration.class]: Unsatisfied dependency expressed through method 'mappingJackson2HttpMessageConverter' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@2437c6dc]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.15.jar:5.3.15]
	... 24 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageConverters' defined in class path resource [org/springframework/boot/autoconfigure/http/HttpMessageConvertersAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.autoconfigure.http.HttpMessageConverters]: Factory method 'messageConverters' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mappingJackson2HttpMessageConverter' defined in class path resource [org/springframework/boot/autoconfigure/http/JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration.class]: Unsatisfied dependency expressed through method 'mappingJackson2HttpMessageConverter' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@2437c6dc]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory$DependencyObjectProvider.getIfAvailable(DefaultListableBeanFactory.java:2030) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory$DependencyObjectProvider.ifAvailable(DefaultListableBeanFactory.java:2041) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.configureMessageConverters(WebMvcAutoConfiguration.java:232) ~[spring-boot-autoconfigure-2.6.3.jar:2.6.3]
	at org.springframework.web.servlet.config.annotation.WebMvcConfigurerComposite.configureMessageConverters(WebMvcConfigurerComposite.java:137) ~[spring-webmvc-5.3.15.jar:5.3.15]
	at org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration.configureMessageConverters(DelegatingWebMvcConfiguration.java:118) ~[spring-webmvc-5.3.15.jar:5.3.15]
	at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.getMessageConverters(WebMvcConfigurationSupport.java:865) ~[spring-webmvc-5.3.15.jar:5.3.15]
	at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.requestMappingHandlerAdapter(WebMvcConfigurationSupport.java:673) ~[spring-webmvc-5.3.15.jar:5.3.15]
	at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfiguration.requestMappingHandlerAdapter(WebMvcAutoConfiguration.java:419) ~[spring-boot-autoconfigure-2.6.3.jar:2.6.3]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.15.jar:5.3.15]
	... 25 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.autoconfigure.http.HttpMessageConverters]: Factory method 'messageConverters' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mappingJackson2HttpMessageConverter' defined in class path resource [org/springframework/boot/autoconfigure/http/JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration.class]: Unsatisfied dependency expressed through method 'mappingJackson2HttpMessageConverter' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@2437c6dc]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.15.jar:5.3.15]
	... 49 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mappingJackson2HttpMessageConverter' defined in class path resource [org/springframework/boot/autoconfigure/http/JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration.class]: Unsatisfied dependency expressed through method 'mappingJackson2HttpMessageConverter' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@2437c6dc]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:541) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1614) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1571) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveMultipleBeans(DefaultListableBeanFactory.java:1415) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1347) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory$DependencyObjectProvider.resolveStream(DefaultListableBeanFactory.java:2117) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory$DependencyObjectProvider.orderedStream(DefaultListableBeanFactory.java:2111) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration.messageConverters(HttpMessageConvertersAutoConfiguration.java:70) ~[spring-boot-autoconfigure-2.6.3.jar:2.6.3]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.15.jar:5.3.15]
	... 50 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@2437c6dc]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:597) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.15.jar:5.3.15]
	... 72 common frames omitted
Caused by: java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@2437c6dc]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:481) ~[spring-core-5.3.15.jar:5.3.15]
	at org.springframework.util.ReflectionUtils.doWithLocalMethods(ReflectionUtils.java:321) ~[spring-core-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.buildLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:232) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.findLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:210) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(InitDestroyAnnotationBeanPostProcessor.java:149) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(CommonAnnotationBeanPostProcessor.java:305) ~[spring-context-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyMergedBeanDefinitionPostProcessors(AbstractAutowireCapableBeanFactory.java:1116) ~[spring-beans-5.3.15.jar:5.3.15]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.3.15.jar:5.3.15]
	... 82 common frames omitted
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/exc/StreamWriteException
	at java.base/java.lang.Class.getDeclaredMethods0(Native Method) ~[na:na]
	at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3167) ~[na:na]
	at java.base/java.lang.Class.getDeclaredMethods(Class.java:2310) ~[na:na]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:463) ~[spring-core-5.3.15.jar:5.3.15]
	... 89 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.core.exc.StreamWriteException
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582) ~[na:na]
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
	... 93 common frames omitted

Disconnected from the target VM, address: '127.0.0.1:59002', transport: 'socket'

Process finished with exit code 0

报错提示ClassNotFoundException，很明显，这种问题一般都是出现在缺少依赖的情况下的，但是jackson这个东西，我之前一直用的好好的啊！怎么突然就说找不到了呢？我在密密麻麻的POM文件中看了半天，也没发现什么问题。我也没做多大改动啊，怎么就跑不起来了呢？我想了下，问题会不会是依赖冲突导致的？我去看看External Libraries：

Gradle 添加私有仓库

Thu, 25 Aug 2022 09:18:33 +0000

以Android Studio为例

在build.gradle(Project)中添加maven{…}，如下所示：

buildscript {
    repositories {
        maven {
            url "https://maven.imcaoxuan.cn:8443/repository/public/"
            credentials {
                username = 'public'
                password = 'public'
            }
        }
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:7.0.4'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

在settings.gradle(Project)中添加maven{…}，如下所示：

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        maven {
            url "https://maven.imcaoxuan.cn:8443/repository/public/"
            credentials {
                username = 'public'
                password = 'public'
            }
        }
        google()
        mavenCentral()
        jcenter() // Warning: this repository is going to shut down soon
    }
}

3.Sync now!

转发：解决warning: LF will be replaced by CRLF in方法

Sun, 21 Aug 2022 07:03:21 +0000

在windows下add代码时一直提示：warning: LF will be replaced by CRLF in，虽然没多大影响，但是看得不爽。

解决办法：

git config –global core.autocrlf false

转发：Ubuntu 创建 RAID1 阵列

Sun, 24 Jul 2022 15:55:00 +0000

# 列出所有磁盘信息
$ sudo fdisk -l 

# 建立分区
$ sudo fdisk /dev/sdb

# 然后依次输入
$ n (新建分区表)
$ p (主分区，然后根据提示操作)
$ w (保存分区信息)

$ sudo mdadm --create  --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1
mdadm: Note: this array has metadata at the start and
    may not be suitable as a boot device.  If you plan to
    store '/boot' on this device please ensure that
    your boot-loader understands md/v1.x metadata, or use
    --metadata=0.90
mdadm: size set to 20953088K
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.

JAVA_HOME

Sun, 17 Jul 2022 13:36:33 +0000

#JAVA_HOME
export JAVA_HOME=/opt/jdk1.8.0_201
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

定时任务

Sun, 17 Jul 2022 13:34:49 +0000

example:

*/1 * * * *  /home/admin/traffic.sh echo > /home/admin/log/traffic.log

Ubuntu修改代理

Sun, 17 Jul 2022 13:33:27 +0000

vim /etc/apt/apt.conf.d/90curtin-aptproxy

然后…

整合代码：TOTP+Hex+Base32

Tue, 22 Mar 2022 11:54:00 +0000

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.lang.reflect.UndeclaredThrowableException;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.GeneralSecurityException;
import java.util.Arrays;


public class TotpDemo {
    private static final int[] DIGITS_POWER
            // 0 1  2   3    4     5      6       7        8
            = {1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000};

    public static void main(String[] args) {
        // todo
        String secretKey = "";
        Base32 base32 = new Base32();
        byte[] bytes = base32.decode(secretKey.toUpperCase());
        // [-84, -88, -126, -19, 116, -72, -61, -58, 117, 53]
        String hexKey = Hex.encodeHexString(bytes);
        String hexTime = Long.toHexString(System.currentTimeMillis() / 30 / 1000);
        System.out.println(generateTOTP(hexKey, hexTime, "6"));
    }

    static class Hex {
        public static String encodeHexString(final byte[] data) {
            return new String(encodeHex(data));
        }

        public static char[] encodeHex(final byte[] data) {
            return encodeHex(data, true);
        }

        public static char[] encodeHex(final byte[] data, final boolean toLowerCase) {
            return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
        }

        protected static char[] encodeHex(final byte[] data, final char[] toDigits) {
            final int l = data.length;
            final char[] out = new char[l << 1];
            // two characters form the hex value.
            for (int i = 0, j = 0; i < l; i++) {
                out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
                out[j++] = toDigits[0x0F & data[i]];
            }
            return out;
        }

        private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
                'e', 'f'};

        /**
         * Used to build output as Hex
         */
        private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
                'E', 'F'};
    }

    public static String generateTOTP(String key,
                                      String time,
                                      String returnDigits) {
        return generateTOTP(key, time, returnDigits, "HmacSHA1");
    }

    private static byte[] hmac_sha1(String crypto, byte[] keyBytes,
                                    byte[] text) {
        try {
            Mac hmac;
            hmac = Mac.getInstance(crypto);
            SecretKeySpec macKey =
                    new SecretKeySpec(keyBytes, "RAW");
            hmac.init(macKey);
            return hmac.doFinal(text);
        } catch (GeneralSecurityException gse) {
            throw new UndeclaredThrowableException(gse);
        }
    }

    private static byte[] hexStr2Bytes(String hex) {
        // Adding one byte to get the right conversion
        // values starting with "0" can be converted
        byte[] bArray = new BigInteger("10" + hex, 16).toByteArray();

        // Copy all the REAL bytes, not the "first"
        byte[] ret = new byte[bArray.length - 1];
        for (int i = 0; i < ret.length; i++)
            ret[i] = bArray[i + 1];
        return ret;
    }

    private static String generateTOTP(String key,
                                       String time,
                                       String returnDigits,
                                       String crypto) {
        int codeDigits = Integer.decode(returnDigits).intValue();
        String result;
        byte[] hash;

        // Using the counter
        // First 8 bytes are for the movingFactor
        // Complaint with base RFC 4226 (HOTP)
        while (time.length() < 16)
            time = "0" + time;

        // Get the HEX in a Byte[]
        byte[] msg = hexStr2Bytes(time);

        // Adding one byte to get the right conversion
        byte[] k = hexStr2Bytes(key);

        hash = hmac_sha1(crypto, k, msg);

        // put selected bytes into result int
        int offset = hash[hash.length - 1] & 0xf;

        int binary =
                ((hash[offset] & 0x7f) << 24) |
                        ((hash[offset + 1] & 0xff) << 16) |
                        ((hash[offset + 2] & 0xff) << 8) |
                        (hash[offset + 3] & 0xff);

        int otp = binary % DIGITS_POWER[codeDigits];

        result = Integer.toString(otp);
        while (result.length() < codeDigits) {
            result = "0" + result;
        }
        return result;
    }

    static abstract class BaseNCodec {
        static final int EOF = -1;
        protected final byte pad;
        protected static final int MASK_8BITS = 0xff;
        protected static final byte PAD_DEFAULT = '='; // Allow static access to default
        private final int unencodedBlockSize;

        /**
         * Number of bytes in each full block of encoded data, e.g. 3 for Base64 and 8 for Base32
         */
        private final int encodedBlockSize;
        protected final int lineLength;

        /**
         * Size of chunk separator. Not used unless {@link #lineLength} &gt; 0.
         */
        private final int chunkSeparatorLength;

        protected BaseNCodec(final int unencodedBlockSize, final int encodedBlockSize,
                             final int lineLength, final int chunkSeparatorLength, final byte pad) {
            this.unencodedBlockSize = unencodedBlockSize;
            this.encodedBlockSize = encodedBlockSize;
            final boolean useChunking = lineLength > 0 && chunkSeparatorLength > 0;
            this.lineLength = useChunking ? (lineLength / encodedBlockSize) * encodedBlockSize : 0;
            this.chunkSeparatorLength = chunkSeparatorLength;

            this.pad = pad;
        }

        public byte[] decode(final String pArray) {
            return decode(pArray.getBytes(StandardCharsets.UTF_8));
        }

        public byte[] decode(final byte[] pArray) {
            if (pArray == null || pArray.length == 0) {
                return pArray;
            }
            final Context context = new Context();
            decode(pArray, 0, pArray.length, context);
            decode(pArray, 0, EOF, context); // Notify decoder of EOF.
            final byte[] result = new byte[context.pos];
            readResults(result, 0, result.length, context);
            return result;
        }

        abstract void decode(byte[] pArray, int i, int length, Context context);

        int readResults(final byte[] b, final int bPos, final int bAvail, final Context context) {
            if (context.buffer != null) {
                final int len = Math.min(available(context), bAvail);
                System.arraycopy(context.buffer, context.readPos, b, bPos, len);
                context.readPos += len;
                if (context.readPos >= context.pos) {
                    context.buffer = null; // so hasData() will return false, and this method can return -1
                }
                return len;
            }
            return context.eof ? EOF : 0;
        }

        int available(final Context context) {  // package protected for access from I/O streams
            return context.buffer != null ? context.pos - context.readPos : 0;
        }

        protected byte[] ensureBufferSize(int size, Context context) {
            if (context.buffer == null) {
                context.buffer = new byte[this.getDefaultBufferSize()];
                context.pos = 0;
                context.readPos = 0;
            } else if (context.pos + size - context.buffer.length > 0) {
                return resizeBuffer(context, context.pos + size);
            }

            return context.buffer;
        }

        protected int getDefaultBufferSize() {
            return 8192;
        }

        private static byte[] resizeBuffer(Context context, int minCapacity) {
            int oldCapacity = context.buffer.length;
            int newCapacity = oldCapacity * 2;
            if (compareUnsigned(newCapacity, minCapacity) < 0) {
                newCapacity = minCapacity;
            }

            if (compareUnsigned(newCapacity, 2147483639) > 0) {
                newCapacity = createPositiveCapacity(minCapacity);
            }

            byte[] b = new byte[newCapacity];
            System.arraycopy(context.buffer, 0, b, 0, context.buffer.length);
            context.buffer = b;
            return b;
        }

        private static int compareUnsigned(int x, int y) {
            return Integer.compare(x + -2147483648, y + -2147483648);
        }

        private static int createPositiveCapacity(int minCapacity) {
            if (minCapacity < 0) {
                throw new OutOfMemoryError("Unable to allocate array size: " + ((long) minCapacity & 4294967295L));
            } else {
                return minCapacity > 2147483639 ? minCapacity : 2147483639;
            }
        }

        protected boolean containsAlphabetOrPad(final byte[] arrayOctet) {
            if (arrayOctet == null) {
                return false;
            }
            for (final byte element : arrayOctet) {
                if (pad == element || isInAlphabet(element)) {
                    return true;
                }
            }
            return false;
        }

        protected abstract boolean isInAlphabet(byte value);

        protected static boolean isWhiteSpace(final byte byteToCheck) {
            switch (byteToCheck) {
                case ' ':
                case '\n':
                case '\r':
                case '\t':
                    return true;
                default:
                    return false;
            }
        }

        static class Context {
            int ibitWorkArea;
            long lbitWorkArea;
            byte[] buffer;
            int pos;
            int readPos;
            boolean eof;
            int currentLinePos;
            int modulus;

            Context() {
            }

            public String toString() {
                return String.format("%s[buffer=%s, currentLinePos=%s, eof=%s, ibitWorkArea=%s, lbitWorkArea=%s, modulus=%s, pos=%s, readPos=%s]", this.getClass().getSimpleName(), Arrays.toString(this.buffer), this.currentLinePos, this.eof, this.ibitWorkArea, this.lbitWorkArea, this.modulus, this.pos, this.readPos);
            }
        }
    }

    static class Base32 extends TotpForXuandembp.BaseNCodec {
        private final int decodeSize;
        private final int encodeSize;
        private final byte[] decodeTable;
        private final byte[] encodeTable;
        private final byte[] lineSeparator;

        private static final int BITS_PER_ENCODED_BYTE = 5;
        private static final int BYTES_PER_ENCODED_BLOCK = 8;
        private static final int BYTES_PER_UNENCODED_BLOCK = 5;
        private static final long MASK_2BITS = 0x03L;
        private static final long MASK_7BITS = 0x7fL;
        /**
         * Mask used to extract 6 bits, used when decoding final trailing character.
         */
        private static final long MASK_6BITS = 0x3fL;
        /**
         * Mask used to extract 5 bits, used when encoding Base32 bytes
         */
        private static final int MASK_5BITS = 0x1f;
        /**
         * Mask used to extract 4 bits, used when decoding final trailing character.
         */
        private static final long MASK_4BITS = 0x0fL;
        /**
         * Mask used to extract 3 bits, used when decoding final trailing character.
         */
        private static final long MASK_3BITS = 0x07L;
        /** Mask used to extract 2 bits, used when decoding final trailing character. */
        /**
         * Mask used to extract 1 bits, used when decoding final trailing character.
         */
        private static final long MASK_1BITS = 0x01L;

        public Base32() {
            this(false);
        }

        public Base32(final boolean useHex) {
            this(0, null, useHex, PAD_DEFAULT);
        }

        public Base32(final int lineLength, final byte[] lineSeparator, final boolean useHex, final byte pad) {
            super(BYTES_PER_UNENCODED_BLOCK, BYTES_PER_ENCODED_BLOCK, lineLength,
                    lineSeparator == null ? 0 : lineSeparator.length, pad);
            if (useHex) {
                this.encodeTable = HEX_ENCODE_TABLE;
                this.decodeTable = HEX_DECODE_TABLE;
            } else {
                this.encodeTable = ENCODE_TABLE;
                this.decodeTable = DECODE_TABLE;
            }
            if (lineLength > 0) {
                if (lineSeparator == null) {
                    throw new IllegalArgumentException("lineLength " + lineLength + " > 0, but lineSeparator is null");
                }
                // Must be done after initializing the tables
                if (containsAlphabetOrPad(lineSeparator)) {
                    final String sep = new String(lineSeparator, StandardCharsets.UTF_8);
                    throw new IllegalArgumentException("lineSeparator must not contain Base32 characters: [" + sep + "]");
                }
                this.encodeSize = BYTES_PER_ENCODED_BLOCK + lineSeparator.length;
                this.lineSeparator = new byte[lineSeparator.length];
                System.arraycopy(lineSeparator, 0, this.lineSeparator, 0, lineSeparator.length);
            } else {
                this.encodeSize = BYTES_PER_ENCODED_BLOCK;
                this.lineSeparator = null;
            }
            this.decodeSize = this.encodeSize - 1;

            if (isInAlphabet(pad) || isWhiteSpace(pad)) {
                throw new IllegalArgumentException("pad must not be in alphabet or whitespace");
            }
        }

        private static final byte[] HEX_DECODE_TABLE = {
                //  0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
                -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 00-0f
                -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 10-1f
                -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 20-2f
                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, // 30-3f 2-7
                -1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, // 40-4f A-O
                25, 26, 27, 28, 29, 30, 31,                                     // 50-56 P-V
                -1, -1, -1, -1, -1, -1, -1, -1, -1, // 57-5f Z-_
                -1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, // 60-6f `-o
                25, 26, 27, 28, 29, 30, 31                                      // 70-76 p-v
        };

        /**
         * This array is a lookup table that translates 5-bit positive integer index values into their
         * "Base32 Hex Alphabet" equivalents as specified in Table 4 of RFC 4648.
         */
        private static final byte[] HEX_ENCODE_TABLE = {
                '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
                'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
        };
        private static final byte[] DECODE_TABLE = {
                //  0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
                -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 00-0f
                -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 10-1f
                -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 20-2f
                -1, -1, 26, 27, 28, 29, 30, 31, -1, -1, -1, -1, -1, -1, -1, -1, // 30-3f 2-7
                -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 40-4f A-O
                15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,                     // 50-5a P-Z
                -1, -1, -1, -1, -1, // 5b - 5f
                -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 60 - 6f a-o
                15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,                     // 70 - 7a p-z/**/
        };

        /**
         * This array is a lookup table that translates 5-bit positive integer index values into their "Base32 Alphabet"
         * equivalents as specified in Table 3 of RFC 4648.
         */
        private static final byte[] ENCODE_TABLE = {
                'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
                'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
                '2', '3', '4', '5', '6', '7',
        };

        private static void validateCharacter(final long emptyBitsMask, final Context context) {
            // Use the long bit work area
            if ((context.lbitWorkArea & emptyBitsMask) != 0) {
                throw new IllegalArgumentException(
                        "Last encoded character (before the paddings if any) is a valid base 32 alphabet but not a possible value. " +
                                "Expected the discarded bits to be zero.");
            }
        }

        void decode(final byte[] input, int inPos, final int inAvail, final Context context) {
            // package protected for access from I/O streams

            if (context.eof) {
                return;
            }
            if (inAvail < 0) {
                context.eof = true;
            }
            for (int i = 0; i < inAvail; i++) {
                final byte b = input[inPos++];
                if (b == pad) {
                    // We're done.
                    context.eof = true;
                    break;
                }
                final byte[] buffer = ensureBufferSize(decodeSize, context);
                if (b >= 0 && b < this.decodeTable.length) {
                    final int result = this.decodeTable[b];
                    if (result >= 0) {
                        context.modulus = (context.modulus + 1) % BYTES_PER_ENCODED_BLOCK;
                        // collect decoded bytes
                        context.lbitWorkArea = (context.lbitWorkArea << BITS_PER_ENCODED_BYTE) + result;
                        if (context.modulus == 0) { // we can output the 5 bytes
                            buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 32) & MASK_8BITS);
                            buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 24) & MASK_8BITS);
                            buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 16) & MASK_8BITS);
                            buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 8) & MASK_8BITS);
                            buffer[context.pos++] = (byte) (context.lbitWorkArea & MASK_8BITS);
                        }
                    }
                }
            }

            // Two forms of EOF as far as Base32 decoder is concerned: actual
            // EOF (-1) and first time '=' character is encountered in stream.
            // This approach makes the '=' padding characters completely optional.
            if (context.eof && context.modulus >= 2) { // if modulus < 2, nothing to do
                final byte[] buffer = ensureBufferSize(decodeSize, context);

                //  we ignore partial bytes, i.e. only multiples of 8 count
                switch (context.modulus) {
                    case 2: // 10 bits, drop 2 and output one byte
                        validateCharacter(MASK_2BITS, context);
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 2) & MASK_8BITS);
                        break;
                    case 3: // 15 bits, drop 7 and output 1 byte
                        validateCharacter(MASK_7BITS, context);
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 7) & MASK_8BITS);
                        break;
                    case 4: // 20 bits = 2*8 + 4
                        validateCharacter(MASK_4BITS, context);
                        context.lbitWorkArea = context.lbitWorkArea >> 4; // drop 4 bits
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 8) & MASK_8BITS);
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea) & MASK_8BITS);
                        break;
                    case 5: // 25bits = 3*8 + 1
                        validateCharacter(MASK_1BITS, context);
                        context.lbitWorkArea = context.lbitWorkArea >> 1;
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 16) & MASK_8BITS);
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 8) & MASK_8BITS);
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea) & MASK_8BITS);
                        break;
                    case 6: // 30bits = 3*8 + 6
                        validateCharacter(MASK_6BITS, context);
                        context.lbitWorkArea = context.lbitWorkArea >> 6;
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 16) & MASK_8BITS);
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 8) & MASK_8BITS);
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea) & MASK_8BITS);
                        break;
                    case 7: // 35 = 4*8 +3
                        validateCharacter(MASK_3BITS, context);
                        context.lbitWorkArea = context.lbitWorkArea >> 3;
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 24) & MASK_8BITS);
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 16) & MASK_8BITS);
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea >> 8) & MASK_8BITS);
                        buffer[context.pos++] = (byte) ((context.lbitWorkArea) & MASK_8BITS);
                        break;
                    default:
                        // modulus can be 0-7, and we excluded 0,1 already
                        throw new IllegalStateException("Impossible modulus " + context.modulus);
                }
            }
        }

        @Override
        protected boolean isInAlphabet(byte octet) {
            return octet >= 0 && octet < decodeTable.length && decodeTable[octet] != -1;
        }
    }
}

转发：nginx反向代理websocket返回403

Wed, 09 Feb 2022 14:06:00 +0000

The log accessed through nginx has the following entry:

DEBUG ... o.s.w.s.s.s.OriginHandshakeInterceptor   : Handshake request rejected, Origin header value https://some-host.com not allowed

Then Google queries related solutions to find the issue on GitHub, so you only need to modify the configuration of nginx and addproxy_set_header Origin “";That’s it.

http { //SSL related configuration

map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}

server {
    listen 8020;
    location /ws {
        proxy_pass http://some-ip:8080;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_set_header Origin "";
    }
}

在我的access.log中并未发现关于“Origin”的信息，但是按照此方案修改配置文件后却可以解决问题。 [1]: https://developpaper.com/solution-of-nginx-reverse-proxy-websocket-response-403/

复习：StringBuilder和String拼接字符串效率差距真大

Sun, 23 Jan 2022 07:20:22 +0000

换成StringBuilder后速度提升了4个数量级！

至于原因，大家应该都懂，我就不再赘述了。 基础不能忘！！！ 基础不能忘！！！ 基础不能忘！！！

转载：一个好用的zip库zip4j

Sun, 23 Jan 2022 03:47:58 +0000

Demo：@user2003470

import net.lingala.zip4j.exception.ZipException;
import net.lingala.zip4j.core.ZipFile;


public static void unzip(){
    String source = "some/compressed/file.zip";
    String destination = "some/destination/folder";
    String password = "password";

    try {
         ZipFile zipFile = new ZipFile(source);
         if (zipFile.isEncrypted()) {
            zipFile.setPassword(password);
         }
         zipFile.extractAll(destination);
    } catch (ZipException e) {
        e.printStackTrace();
    }
}

The Maven dependency is:

<dependency>
    <groupId>net.lingala.zip4j</groupId>
    <artifactId>zip4j</artifactId>
    <version>1.3.2</version>
</dependency>

Ubuntu20.04中使用snap安装的docker如何修改registry-mirrors

Sun, 16 Jan 2022 14:24:43 +0000

通过 systemctl status snap.docker.dockerd.service 命令，可以找到daemon.json的路径

Ubuntu20.04中使用snap安装的docker如何开启远程访问？

Sun, 16 Jan 2022 13:32:00 +0000

@Rumdex

By running: systemctl status snap.docker.dockerd.service I was able to see which was the loaded service file: /etc/systemd/system/snap.docker.dockerd.service Just looked inside this file looking for the ExecStart directive. It was there. So just had to add -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock to that line, so it ended up looking like: ExecStart=/usr/bin/snap run docker.dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock Rebooted. Works.

文件名中出现^M导致java.io.FileNotFoundException

Tue, 16 Nov 2021 01:40:00 +0000

解决方案：vi filename打开文件，执行 : set ff=unix 设置文件为unix，然后执行:wq，保存成unix格式参考：https://blog.csdn.net/ygy162/article/details/105364096/

用多个密钥解密同一个密文

Tue, 21 Sep 2021 09:51:04 +0000

思想借鉴：https://www.zhihu.com/question/266180268

从严格意义上来说，这并不是某个加密算法，能够同时允许多个密钥解密。而是对称加密和非对称加密算法配合，实现将数据加密分发给多个人，能够让不同人使用自己的密钥解密数据

在线测试：Secret (caoxuan.top)

Demo（AES+RSA）:

package t20210921;

import util.AESUtil;
import util.RSAUtil;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Cao Xuan
 * @date 2021/9/21 17:15
 */
public class Test {
    public static void main(String[] args) throws Exception {
        String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCrfQnSoLWLyob3d7PgZySgzRtAHCxyJaYs+Mqc2WeqwaxAlYV1vunmoadaVX00XzCqZej9HOxUbyxIJswrbKsK39mlj6LQ0VIVRngYgaYF5M7JsshiNnY0BCdmA39TzGtmdUDxppKQjyVT6MeUfqFO5NV9emWcrBKCad1Hql16AQIDAQAB";
        String privateKey = "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";
        String secretKey = "60479f43-b296-4199-8d97-de472e1d37bd";
        String plainText = "cxnb";
        String secretText = AESUtil.encrypt(plainText, secretKey);
        System.out.println("原文：" + plainText);
        System.out.println("密文：" + secretText);
        List<String> mySecretList = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            mySecretList.add(RSAUtil.encrypt(secretKey, publicKey));
        }
        System.out.println("多密钥" + mySecretList);
        mySecretList.forEach(e -> {
            System.out.println("使用密钥" + e + "解密");
            try {
                String s = AESUtil.decrypt(secretText, RSAUtil.decrypt(e, privateKey));
                System.out.println("解密成功" + s);
            } catch (Exception exception) {
                exception.printStackTrace();
            }
        });
    }
}

转发：mybatis 大坑之 useGeneratedKeys 返回值不是id，而是0跟1

Sun, 22 Aug 2021 07:46:07 +0000

原文：https://blog.csdn.net/a5601564/article/details/77945958/

转发：mybatis报错：Error evaluating expression

Sat, 21 Aug 2021 15:45:54 +0000

解决：if标签的test里面的表达式的and不能写成大写AND。（具体的原因本人没有详细探究过，估计是mybatis的语法不允许吧）

原文：mybatis报错：Error evaluating expression

转发：Android Bitmap压缩图像的正确方法(compress的误区)

Sun, 15 Aug 2021 06:08:34 +0000

Bitmap.compress方法确实可以压缩图片，但压缩的是存储大小，即你放到disk上的大小

我尝试过把品质设置为10，decode出来的Bitmap大小没变，但显示照片的质量非常差

BitmapFactory.decodeByteArray方法对压缩后的byte[]解码后，得到的Bitmap大小依然和未压缩过一样

如果你想要显示的Bitmap占用的内存少一点，还是需要去设置加载的像素长度和宽度（变成缩略图）

原文地址：https://blog.csdn.net/T3/article/details/79665077

Linux下使用jps命令报错

Sat, 14 Aug 2021 06:14:00 +0000

![QQ截图20210814141543.png][1]

解决方案

![QQ截图20210814141703.png][2]

cd ..

发现是因为刚才在xftp中删除了此目录导致的![QQ截图20210814141831.png][3]

cd /

cd到根目录，再尝试使用jps，发现问题已解决 [1]: https://www.caoxuan.top/usr/uploads/2021/08/1556106767.png [2]: https://www.caoxuan.top/usr/uploads/2021/08/3988254530.png [3]: https://www.caoxuan.top/usr/uploads/2021/08/2498345376.png

好久没写了，随便水一贴吧

Tue, 20 Jul 2021 13:39:57 +0000

六月十一辛丑年牛乙未月己巳日

2021/7/20

关于在Nginx中配置顶级域名与www域名之间跳转以及https和如何搭配CDN的综合解决方案

Tue, 04 May 2021 13:08:00 +0000

	方案一	方案二（不推荐）	方案三
使用场景	一般情况	顶级域名存在邮件服务	顶级域名存在邮件服务
相对复杂度	低	中	高
终点	`https://www.example.com`	`https://www.example.com`	`https://www.example.com`
隐藏源站IP	是	是	是
相对可用性	高	低	高
缺点	无法在顶级域名存在邮件服务的情况下使用	无法直接访问`https://example.com`	成本略高，配置麻烦
特殊要求	无	要求DNS服务商支持显性URL转发	需要一台代理服务器

方案一

源站配置（以Nginx为例）

关于www和naked域名的重新向以及https的解决方案（以Nginx为例） - 西叉的代码屋 (caoxuan.top)

CDN配置（以腾讯云为例）

基础配置

加速域名：www.example.com

源站类型：自有源

回源协议：协议跟随

源站地址：1.1.1.1（源站IP）

回源HOST：www.example.com

HTTPS配置

强制跳转

跳转配置：开

跳转类型：http->https

跳转方式：301跳转

携带头部：否

DNS配置（以阿里云为例）

记录类型	主机记录	解析线路	记录值	TTL
CNAME	www	默认	`www.example.com.cdn.dnsv1.com`（示例；实际以CDN控制台的为准）	10分钟
CNAME	@	默认	`www.example.com`	10分钟

路径表

起点	过程	浏览器请求次数
`http://example.com`或`example.com`	起点 -> CDN（301 `https://example.com`）`https://example.com` -> CDN -> 源站（301 `https://www.example.com`）`https://www.example.com` -> CDN -> 源站资源	3
`http://www.example.com`或`www.example.com`	起点 -> CDN（301 `https://www.example.com`）`https://www.example.com` -> CDN -> 源站资源	2
`https://example.com`	起点 -> CDN -> 源站（301 `https://www.example.com`）`https://www.example.com` -> CDN -> 源站资源	2
`https://www.example.com`	起点 -> CDN -> 源站资源	1

应急解决方案（保证可用性；前提：Nginx配置与本方案的源站配置相同）

SSL出现问题

步骤一：修改CDN的HTTPS配置

关闭强制跳转

关于www和naked域名的重新向以及https的解决方案（以Nginx为例）

Tue, 04 May 2021 10:55:00 +0000

#server1 http://example.com
server {
    listen       80;
    server_name  example.com;
	return 301 http://www.example.com$request_uri;
}

#server2 http://www.example.com
server {
    listen       80;
    server_name  www.example.com;
	return 301 https://$server_name$request_uri;
}

#server3 https://example.com
server {
	listen 443 ssl http2;
	server_name example.com;
	ssl_certificate 0000000_example.com.pem;
    ssl_certificate_key 0000000_example.com.key;
    ssl_session_cache   shared:SSL:10m;
	ssl_session_timeout 10m;
    ssl_protocols  TLSv1.2 TLSv1.3;
	return 301 https://www.example.com$request_uri;
}

#server4 https://www.example.com
server {
	listen 443 ssl ;
	server_name www.example.com;
	ssl_certificate 0000000_example.com.pem;
    ssl_certificate_key 0000000_example.com.key;
    ssl_session_cache   shared:SSL:10m;
	ssl_session_timeout 10m;
    ssl_protocols  TLSv1.2 TLSv1.3;
	location / {
		root   /usr/share/nginx/html;
        index index.html index.htm;
	}	
}

FAQs

Q：为什么要重定向多次？而不直接重定向到 https://www.example.com ？

A：为了降低出错后的维护成本，当ssl出现问题时，只需修改一个server（server2）即可以http的方式访问，从而恢复正常工作。

Q：这样做对SEO有影响吗？

A：鄙人才疏学浅，请自行查阅资料了解。目前看来，使用Google可以搜索到本站的内容，但是某度却不行。

fastjson反序列化后缺失属性值

Mon, 19 Apr 2021 15:09:00 +0000

解决方案：如果使用了Lombok，就在相应的实体类上添加注解*@NoArgsConstructor*；否则就手动重写无参构造方法。

RecyclerView只显示一条数据

Thu, 15 Apr 2021 08:26:10 +0000

检查对应的item，将android:layout_height=“match_parent"改为android:layout_height=“wrap_content”。

简单实现负载均衡

Sun, 21 Mar 2021 15:03:00 +0000

package algorithm.loadbalance;

import com.alibaba.fastjson.JSON;

import java.util.*;

/**

@author Cao Xuan
@date 2021/3/21 20:04
@update 2021/5/5 */ public class LoadBalanceDemo {

private final List serverList = new ArrayList<>();

/**
- client -> server */ private final Map<Client, Server> clientServerMap = new HashMap<>();
/**
- <—head—tail—>
- <—light—weight—>
- <—former—latter–> */ @Deprecated private void sort() { for (int i = serverList.size() - 1; i > 0; i–) { for (int j = i - 1; j > -1; j–) { Server latter = new Server(serverList.get(i)); Server former = new Server(serverList.get(j)); if (latter.getCurrentLoad().size() > former.getCurrentLoad().size()) { serverList.set(i, former); serverList.set(j, latter); } } } System.out.println(“sorting…”); }
/**

群晖 GitServer用户为空的解决办法

Fri, 26 Feb 2021 08:07:10 +0000

sudo cp /var/packages/Git/target/webapi/SYNO.Git.lib /var/packages/Git/target/webapi/SYNO.Git.lib.bak sudo vi /var/packages/Git/target/webapi/SYNO.Git.lib 删掉appPriv 之后的SYNO.SDS.GIT.Instance 保存退出

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Thu, 17 Dec 2020 15:40:52 +0000

西叉的代码屋

20250916144004

个性化的阿里云OSS图床

Post202509161428

My First Post

Azure入门指南（一）

注册

Azure服务

虚拟机

创建

基本

Debian-Ubuntu使用Nexus的私有镜像源

以Debian11为例

mybatis xml的字符串表达式中不要包含in（因为in是关键字，除此之外，还有很多关键字都不要放在这里）！！！

群晖Gitlab开启https

MySQL8.0主从同步

一、 主数据库

1.修改配置文件

2.锁表

3.备份

4.创建用户并授权

5.记录信息

6.重启

二、从数据库

1.修改配置文件

2.配置Master

3.运行

Spring Cloud Alibaba 2021.0.1.0 踩坑记录

Gradle 添加私有仓库

以Android Studio为例

转发：解决warning: LF will be replaced by CRLF in方法

转发：Ubuntu 创建 RAID1 阵列

JAVA_HOME

定时任务

Ubuntu修改代理

整合代码：TOTP+Hex+Base32

转发：nginx反向代理websocket返回403

复习：StringBuilder和String拼接字符串效率差距真大

转载：一个好用的zip库zip4j

Ubuntu20.04中使用snap安装的docker如何修改registry-mirrors

Ubuntu20.04中使用snap安装的docker如何开启远程访问？

文件名中出现^M导致java.io.FileNotFoundException

用多个密钥解密同一个密文

转发：mybatis 大坑之 useGeneratedKeys 返回值不是id，而是0跟1

转发：mybatis报错：Error evaluating expression

转发：Android Bitmap压缩图像的正确方法(compress的误区)

Linux下使用jps命令报错

解决方案

好久没写了，随便水一贴吧

关于在Nginx中配置顶级域名与www域名之间跳转以及https和如何搭配CDN的综合解决方案

方案一

源站配置（以Nginx为例）

CDN配置（以腾讯云为例）

基础配置

HTTPS配置

强制跳转

DNS配置（以阿里云为例）

路径表

应急解决方案（保证可用性；前提：Nginx配置与本方案的源站配置相同）

SSL出现问题

步骤一：修改CDN的HTTPS配置

关于www和naked域名的重新向以及https的解决方案（以Nginx为例）

FAQs

fastjson反序列化后缺失属性值

RecyclerView只显示一条数据

简单实现负载均衡

群晖 GitServer用户为空的解决办法

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一、主数据库