限制Log4j2日志最大输出长度

Posted 2021-04-20 走路自带音响

需求由来

昨晚会议，领导提出我们系统的日志刷的太多，给日志的定位造成了极大的困扰，而且一般来说那种很大很大一坨的日志都是不重要的日志，我们不能指望开发时刻意不去打印这些日志，所以只能从日志框架入手解决问题。

参考文档

• https://logging.apache.org/log4j/2.x/manual/layouts.html

具体实现

在layout中配置 %maxLen{%m}{1500}%n 即可。

Configuration:
  status: warn
  monitorInterval: 300

  properties:
    property:
      - name: pattern
        value: "[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%logger{36}.%t:%L] <%X{uuid}> - %maxLen{%m}{1500}%n"
      - name: path
        value: /home/ubuntu/data/server/logs

  Appenders:
    RollingFile:
      - name: AllFile
        fileName: ${path}/all.log
        filePattern: "${path}/archive/$${date:yyyy-MM}/all-%d{yyyy-MM-dd}-%i.log.gz"
        PatternLayout:
          pattern: ${pattern}
        Filters:
          ThresholdFilter:
            - level: fatal
              onMatch: DENY
              onMismatch: NEUTRAL
            - level: debug
              onMatch: ACCEPT
              onMismatch: DENY
        Policies:
          TimeBasedTriggeringPolicy:
            interval: 1
          SizeBasedTriggeringPolicy:
            size: "500 MB"

      - name: ErrorFile
        fileName: ${path}/error.log
        filePattern: "${path}/archive/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log.gz"
        PatternLayout:
          pattern: ${pattern}
        Filters:
          ThresholdFilter:
            - level: fatal
              onMatch: DENY
              onMismatch: NEUTRAL
            - level: error
              onMatch: ACCEPT
              onMismatch: DENY
        Policies:
          TimeBasedTriggeringPolicy:
            interval: 1
          SizeBasedTriggeringPolicy:
            size: "500 MB"

  Loggers:
    Logger:
      name: com.kangyonggan.server.mapper
      level: debug
      additivity: false
      AppenderRef:
        - ref: AllFile
        - ref: ErrorFile

    Root:
      level: info
      additivity: true
      AppenderRef:
        - ref: AllFile
        - ref: ErrorFile

效果

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声明原创需要300字以上，我上面的这些不够300个字吗？它是没有把代码也算进去吧！链接不算字数，代码不算字数，图片url不算字数，对于篇幅较小的文章想声明原创有点困难啊，我啰嗦了这么多应该够300字了吧，不够的话我还可以再啰嗦啰嗦的。