java 用log4j输出日志信息

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java 用log4j输出日志信息

1、首先需要向项目导入log4j和commen-logging的jar包
2、配置log4j.xml文件，如果是eclipse环境，则只需放在工程的src下面就可以了

配置内容如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

<appender name="debug-out" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="d:/java-dev/workspace/userInterest/logs/debug.log" />
<param name="MaxFileSize" value="1024KB"/>
<param name="MaxBackupIndex" value="5"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy.MM.dd HH:mm:ss} %c - %m%n" />
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMax" value="debug" />
<param name="AcceptOnMatch" value="true" />
</filter>
</appender>

<appender name="info-out" class="org.apache.log4j.RollingFileAppender" >
<param name="File" value="d:/java-dev/workspace/userInterest/logs/info.log" />
<param name="MaxFileSize" value="1024KB"/>
<param name="MaxBackupIndex" value="5"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy.MM.dd HH:mm:ss} %c - %m%n" />
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMax" value="info" />
<param name="LevelMin" value="info" />
<param name="AcceptOnMatch" value="true" />
</filter>
</appender>

<appender name="warn-out" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="d:/java-dev/workspace/userInterest/logs/warn.log" />
<param name="MaxFileSize" value="1024KB"/>
<param name="MaxBackupIndex" value="5"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy.MM.dd HH:mm:ss} %c - %m%n" />
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMax" value="warn" />
<param name="LevelMin" value="warn" />
<param name="AcceptOnMatch" value="true" />
</filter>
</appender>

<appender name="error-out" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="d:/java-dev/workspace/userInterest/logs/error.log" />
<param name="MaxFileSize" value="1024KB"/>
<param name="MaxBackupIndex" value="5"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy.MM.dd HH:mm:ss} %c - %m%n" />
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMin" value="error" />
<param name="AcceptOnMatch" value="true" />
</filter>
</appender>


<logger name="org.eclipse.jetty">
<level value="warn" />
</logger>

<root>
<level value="info" />
<appender-ref ref="debug-out" />
<appender-ref ref="info-out" />
<appender-ref ref="warn-out" />
<appender-ref ref="error-out" />
</root>

</log4j:configuration>

3、代码调用情况如下：

现在类里面定义静态变量

static Log log = LogFactory.getLog(TestLog.class.getClass());

然后 public static void main(String[] args) {

log.info("Here is some INFO,debug");

}

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