Spring Boot使用Log4j2的实例代码

前言

spring boot 默认使用logback,来打印日志，这里还想说的slfj(simple logging facade for java)，它们之间的关系，一张图，说明一切：

maven 配置

<!--use log4j2 property-->
    <dependency>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter</artifactid>
      <exclusions>
        <exclusion>
          <groupid>org.springframework.boot</groupid>
          <artifactid>spring-boot-starter-logging</artifactid>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter-log4j2</artifactid>
    </dependency>

    <!--flume log4j appender-->
    <dependency>
      <groupid>org.apache.logging.log4j</groupid>
      <artifactid>log4j-flume-ng</artifactid>
      <version>2.6</version>
    </dependency>

log4j2.xml 配置

log4j2 提供非常丰富的appender,比如cassandraappender，asyncappender，我们这里配置了简单的flume appnder,failover appender.

<?xml version="1.0" encoding="utf-8"?>
<configuration monitorinterval="60">
  <properties>
    <property name="source">api-web</property>
    <property name="log-pattern">%d{yyyy-mm-dd hh:mm:ss.sss} [%x{userid}] [%t] [%-5level] %c{1.}@%m%l - %m%n</property>
    <!--get product dynamic property-->
  </properties>
  <appenders>

    <rollingfile name="rollingfile" filename="logs/app.log"
           filepattern="logs/$${date:yyyy-mm}/app-%d{mm-dd-yyyy}-%i.log.gz">
      <patternlayout>
        <pattern>${log-pattern}</pattern>
      </patternlayout>
      <policies>
        <timebasedtriggeringpolicy />
        <sizebasedtriggeringpolicy size="250 mb"/>
      </policies>
    </rollingfile>

    <flume name="eventlogger" compress="false" type="avro" ignoreexceptions="false">
      <agent host="192.168.31.115" port="4444"/>
      <agent host="127.0.0.1" port="4444"/>
      <patternlayout>
        <pattern>
          <pattern>${log-pattern}</pattern>
        </pattern>
      </patternlayout>
    </flume>

    <console name="console-appender" target="system_out" ignoreexceptions="false">
      <patternlayout>
        <pattern>${log-pattern}</pattern>
      </patternlayout>
    </console>

    <!-- 主要apeender失败的时候使用备用appender-->
    <failover name="failover" primary="eventlogger">
      <failovers>
        <appenderref ref="rollingfile"/>
      </failovers>
    </failover>
  </appenders>
  <loggers>
    <!--在需要同时打印文件和发送至flume的时候使用-->
    <!--<logger name="" level="info" additivity="false">-->
      <!--<appenderref ref="rollingfile"/>-->
    <!--</logger>-->
    <root level="info">
      <appenderref ref="console-appender"/>
      <appenderref ref="failover"/>
    </root>
  </loggers>
</configuration>

总结

如果遇到识别不了log4j2.properties/xml，可以在application.properties,中指定 logging.config=classpath:log4j2.properties/xml

参考

http://logging.apache.org/log4j/2.x/manual/appenders.html#rollingfileappender

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