springboot2.X动态修改log4j2日志级别

利用springboot提供的 spring-boot-starter-actuator 包可以实现动态修改log4j2日志级别的功能

添加依赖

添加依赖包

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

修改配置

修改springboot配置文件application.yml，添加如下配置

management:
  endpoints:
    web:
      exposure:
        include: 'loggers'

查询日志级别

利用postman GET请求地址 http://localhost:8080/ecs-exporter/actuator/loggers
得到结果

{
    "levels": [
        "OFF",
        "FATAL",
        "ERROR",
        "WARN",
        "INFO",
        "DEBUG",
        "TRACE"
    ],
    "loggers": {
        "ROOT": {
            "configuredLevel": "INFO",
            "effectiveLevel": "INFO"
        },
        "com": {
            "configuredLevel": "DEBUG",
            "effectiveLevel": "DEBUG"
        }
    }
}

从上面结果中可以看到每个包对应的日志级别，查看指定包对应日志级别可以在url后面拼接对应的包全路径
如：http://localhost:8080/ecs-exporter/actuator/loggers/com

{
    "configuredLevel": "DEBUG",
    "effectiveLevel": "DEBUG"
}

修改

ROOT级别不可动态修改,可以修改每个包的日志级别
利用postman POST请求地址 http://localhost:8080/ecs-exporter/actuator/loggers/对应包
请求体

{
    "configuredLevel": "info"
}

再次查看日志级别，已经变更

{
    "levels": [
        "OFF",
        "FATAL",
        "ERROR",
        "WARN",
        "INFO",
        "DEBUG",
        "TRACE"
    ],
    "loggers": {
        "ROOT": {
            "configuredLevel": "INFO",
            "effectiveLevel": "INFO"
        },
        "com": {
            "configuredLevel": "INFO",
            "effectiveLevel": "INFO"
        }
    }
}

对应log4j.yml配置

  loggers:
    logger:
      - # 以com开头的logger
        name: com
        level: info
        additivity: false
        appenderRef:
          - ref: default_console # 将日志信息输出到控制台
            
    root:
      level: info
      additivity: false
      appenderRef:
        - ref: default_console