log4j2.yml構成の概要

pom.xml：

<!-- log4j2 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>

<!-- 加上这个才能辨认到log4j2.yml文件 -->
<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-yaml</artifactId>
</dependency>

application.yml

logging:
  config: classpath:log4j2.yml

log4j2.yml

# 共有8个级别，按照从低到高为：ALL < TRACE < DEBUG < INFO < WARN < ERROR < FATAL < OFF。
# status：用于设置log4j2自身内部的信息输出，可以不设置
# monitorInterval：log4j2监测配置文件的时间间隔，如果文件被修改，则重新加载
Configuration:
  status: warn
  monitorInterval: 30

  Properties: # 定义全局变量
    Property:
      - name: log.level.console
        value: info
      - name: log.path
      # “sys:”表示：如果VM参数中没指定这个变量值，则使用本文件中定义的缺省全局变量值
      # ${sys:catalina.home} 指向tomcat安装目录
        value: ${sys:catalina.home}/logs
      - name: project.name
        value: CloudEmploy
      - name: log.pattern
        value: "%d{yyyy-MM-dd HH:mm:ss.SSS} -%5p ${PID:-} [%15.15t] %-30.30C{1.} : %m%n"

  Appenders:
    Console:  # 输出到控制台
      name: CONSOLE
      target: SYSTEM_OUT
      PatternLayout:
        pattern: ${log.pattern}
    RollingFile: # 打印到文件
      - name: ROLLING_FILE
        # fileName  指定当前日志文件的位置和文件名称
        fileName: ${log.path}/${project.name}.log
        # filePattern  指定当发生Rolling时，文件的转移和重命名规则
        filePattern: "${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz"
        PatternLayout:
          pattern: ${log.pattern}
        Filters:
          ThresholdFilter:
            - level: ${sys:log.level.console}
              onMatch: ACCEPT
              onMismatch: DENY
        Policies:
          TimeBasedTriggeringPolicy:  # 按天分类
            modulate: true
            interval: 1
        DefaultRolloverStrategy:     # 文件最多100个
          max: 100

# 只有定义了 Loggers，并引入 Appenders，Appenders才会生效
  Loggers:
    Root:
      level: error
      AppenderRef:
        - ref: CONSOLE
        - ref: ROLLING_FILE

    Logger: # 为com.***包配置特殊的Log级别，方便调试，trace会打印SQL具体结果，debug只打印SQL语句
      - name: com.***.mapper
        additivity: false
        level: trace
        AppenderRef:
          - ref: CONSOLE
          - ref: ROLLING_FILE

ます。https：//www.jianshu.com/p/abaa0fa202c2で再現

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