log4j2重复打印日志问题解决

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
  <Appenders>
    <CONSOLE name="CONSOLE">
      <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%X{requestId}] %-5level | %C.%M:%L - %m%n"/>
    </CONSOLE>
  </Appenders>
  <Loggers>
    <Root level="ERROR">
      <AppenderRef ref="CONSOLE"/>
    </Root>
    <logger name="com.ebc.web" level="INFO">
        <AppenderRef ref="CONSOLE"/>
    </logger>
    <logger name="com.ebc.disruptor" level="INFO">
        <AppenderRef ref="CONSOLE"/>
    </logger>
  </Loggers>
</Configuration>

测试输出

2019-01-25 09:58:26.861 [5c4a6d42cbb0e727aad9a7a0] INFO  | com.ebc.web.IndexController.index:25 - 接收参数：name=遥远2,minernum=222
2019-01-25 09:58:26.861 [5c4a6d42cbb0e727aad9a7a0] INFO  | com.ebc.web.IndexController.index:25 - 接收参数：name=遥远2,minernum=222
一月 25, 2019 9:58:26 上午 org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@27fa7512: startup date [Fri Jan 25 09:58:26 GMT+08:00 2019]; root of context hierarchy
2019-01-25 09:58:26.909 [5c4a6d42cbb0e727aad9a7a0] INFO  | com.ebc.disruptor.UserMinerProducer.publish:16 - 接收:5c4a6d42cbb0e727aad9a7a0,222
2019-01-25 09:58:26.909 [5c4a6d42cbb0e727aad9a7a0] INFO  | com.ebc.disruptor.UserMinerProducer.publish:16 - 接收:5c4a6d42cbb0e727aad9a7a0,222
2019-01-25 09:58:26.912 [] INFO  | com.ebc.disruptor.UserMinerHandler.onEvent:18 - userName=5c4a6d42cbb0e727aad9a7a0,amount=222

解决：

把以上红色字体：<AppenderRef ref="CONSOLE"/>，去掉即可。

原因：

logger继承Root，而Root中已经写了<AppenderRef ref="CONSOLE"/>，如果在logger中再次写，则重复打印。