springboot动态调整日志级别

前言：我们在调试程序时，查看日志是主要途径之一。当项目部署到开发测试环境之后，就无法随心所欲通过修改配置文件来修改日志级别，此时就需要动态的调整日志级别来满足调试需求。

1.引入actuator依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
 </dependency>

2.修改application.properties

#暴露loggers这个endpoint
management.endpoints.web.exposure.include=health,info,loggers

3.查看日志信息

• 访问http://ip:port/actuator/loggers 可以看到当前项目每个包的日志级别,可以看到springboot的默认日志级别为info，也就是ROOT对应的日志级别

{
  "levels": [
    "OFF",
    "ERROR",
    "WARN",
    "INFO",
    "DEBUG",
    "TRACE"
  ],
  "loggers": {
    "ROOT": {
      "configuredLevel": "INFO",
      "effectiveLevel": "INFO"
    },
    "com": {
      "configuredLevel": null,
      "effectiveLevel": "INFO"
    },
    "com.yao": {
      "configuredLevel": null,
      "effectiveLevel": "INFO"
    },
    "com.yao.logdemo": {
      "configuredLevel": null,
      "effectiveLevel": "INFO"
    },
    ...
    }

4.修改日志级别

• 修改整个项目日志级别为error

发送post请求到 http://ip:port/actuator/loggers/ROOT ，请求body为

{
    "configuredLevel":"ERROR"
}

再次查看日志信息，可以看到所有ROOT以及所有包的日志级别都变成ERROR了

{
  "levels": [
    "OFF",
    "ERROR",
    "WARN",
    "INFO",
    "DEBUG",
    "TRACE"
  ],
  "loggers": {
    "ROOT": {
      "configuredLevel": "ERROR",
      "effectiveLevel": "ERROR"
    },
    "com": {
      "configuredLevel": null,
      "effectiveLevel": "ERROR"
    },
    "com.yao": {
      "configuredLevel": null,
      "effectiveLevel": "ERROR"
    },
    "com.yao.logdemo": {
      "configuredLevel": null,
      "effectiveLevel": "ERROR"
    },
    ...
    }

• 修改com.yao包日志级别为debug

发送post请求到 http://ip:port/actuator/loggers/com.yao ，请求body为

{
 "configuredLevel":"DEBUG"
}

再次查看日志信息，可以看到com.yao包及包含的包日志级别都变为DEBUG了

{
  "levels": [
    "OFF",
    "ERROR",
    "WARN",
    "INFO",
    "DEBUG",
    "TRACE"
  ],
  "loggers": {
    "ROOT": {
      "configuredLevel": "ERROR",
      "effectiveLevel": "ERROR"
    },
    "com": {
      "configuredLevel": null,
      "effectiveLevel": "ERROR"
    },
    "com.yao": {
      "configuredLevel": "DEBUG",
      "effectiveLevel": "DEBUG"
    },
    "com.yao.logdemo": {
      "configuredLevel": null,
      "effectiveLevel": "DEBUG"
    },
    ...
    }