java log4j.xml配置与使用

偏执的太偏执、 2022-09-30 06:51 90阅读 0赞

将配置好的log4j.xml 放到项目的classpath下即可。我的是放在src下

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<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>                   <appender name="log4jTestDebug" class="org.apache.log4j.RollingFileAppender"> <param name="File" value="D:/work/log/test\_log4j\_debug.log"/> <param name="Append" value="true"/> <param name="MaxFileSize" value="5KB"/> <param name="MaxBackupIndex" value="2"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%c %d\{ISO8601\}-- %p -- %m%n"/> </layout> <filter class="org.apache.log4j.varia.LevelRangeFilter"> <param name="LevelMin" value="DEBUG"/> <param name="LevelMax" value="DEBUG"/> </filter> </appender> <appender name="log4jTestLogInfo" class="org.apache.log4j.RollingFileAppender"> <param name="File" value="D:/work/log/test\_log4j\_info.log"/> <param name="Append" value="true"/> <param name="MaxFileSize" value="5KB"/> <param name="MaxBackupIndex" value="2"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%c %d\{ISO8601\}-- %p -- %m%n"/> </layout> <filter class="org.apache.log4j.varia.LevelRangeFilter"> <param name="LevelMin" value="INFO"/> <param name="LevelMax" value="INFO"/> </filter> </appender>  <category name="com.gzy"> <priority value="debug" /> <appender-ref ref="log4jTestLogInfo" /> <appender-ref ref="log4jTestDebug" /> </category> <root> <priority value="debug"/> </root> </log4j:configuration>

如果出现重复打日志的情况，需要在中添加一个属性 additivity="false"，即

某个logger的additivity设置为false，表示log只打印到本log的appender中，而不再打印到其父logger的appender。

下面写个测试类进行测试

package com.gzy; import org.apache.log4j.Logger; /\*\* \* Created by IntelliJ IDEA. \* User: zunyong \* Date: 2011-4-27 \* Time: 16:54:44 \* To change this template use File | Settings | File Templates. \*/ public class Test \{ private static final Logger log = Logger.getLogger(Test.class); public static void main(String\[\] args) \{ for(int i=0;i<10;i++)\{ log.info("Enter the main()...."); log.debug("Enter the main()...."); log.warn("Enter the main()...."); log.info("Enter the main()...."); System.out.println("this is a log4j test."); log.info("log end."); \} \} \}