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YAMLcom.fasterxml.jackson.core:jackson-databind com.fasterxml.jackson.dataformat:jackson-dataformat-yamllog4j2.yaml log4j2.ymlJSONcom.fasterxml.jackson.core:jackson-databindlog4j2.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 t [PF:%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 t [PF:%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