SpringBoot 配置log4j2日志输出

可以有两种优雅一点的方式：

格式	依赖包	文件名
YAML	com.fasterxml.jackson.core:jackson-databind com.fasterxml.jackson.dataformat:jackson-dataformat-yaml	log4j2.yaml log4j2.yml
JSON	com.fasterxml.jackson.core:jackson-databind	log4j2.json log4j2.jsn

pom.xml

排除 web 包中的 logging,

引入log4j2依赖和yaml 文件识别。

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<!-- 引入log4j2依赖 -->
<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>

log4j2.yaml

在 resources 文件夹下增加 log4j2.yaml 文件。

Configuration:
  status: warn
  Properties: # 定义全局变量
    Property: # 缺省配置（用于开发环境）。其他环境需要在VM参数中指定，如下：
      # 测试：-Dlog.level.console=warn -Dlog.level.xjj=trace
      # 生产：-Dlog.level.console=warn -Dlog.level.xjj=info
      - name: log.level.console
        value: trace
      - name: log.level.com.jeiker.demo.mapper
        value: trace
      - name: log.path
        value: /opt/logs
      - name: project.name
        value: my-app
  Appenders:
    Console:  # 输出到控制台
      name: CONSOLE
      target: SYSTEM_OUT
      ThresholdFilter:
        level: ${sys:log.level.console} # “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
        onMatch: ACCEPT
        onMismatch: DENY
      PatternLayout:
        pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%5p %20t [%50F:%3L] - %m%n"
    RollingFile: # 输出到文件，超过128MB归档
      - name: ROLLING_FILE
        ignoreExceptions: false
        fileName: ${
   log.path}/${project.name}.log
        filePattern: "${ log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz"
        PatternLayout:
          pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%5p %20t [%50F:%3L] - %m%n"
        Policies:
          SizeBasedTriggeringPolicy:
            size: "128 MB"
        DefaultRolloverStrategy:
          max: 1000
  Loggers:
    Root:
      level: info
      AppenderRef:
        - ref: CONSOLE
        - ref: ROLLING_FILE
    Logger: # 为 com.jeiker.demo.mapper 包配置特殊的Log级别，方便调试 SQL 语句输出
      - name: log.level.com.jeiker.demo.mapper
        additivity: false
        level: ${sys:log.level.com.jeiker.demo.mapper}
        AppenderRef:
          - ref: CONSOLE
          - ref: ROLLING_FILE