JAVA项目如何使用日志文件

最近做了一个java桌面程序，界面使用SWT/jface画的，在做的过程中，我想使用log4j记录程序运行的日志信息，当然也包括错误日志。

下面我把使用log4j的使用方法记录在下面，也包括配置方法，供以后参考

1.配置方法：

导入jar包，slf4j-log-4j12.jar，slf4j-api-1.7.2.jar，log4j-1.2.17.jar

把log4j的配置文件log4j.xml拷贝到项目的src目录下

log4j.xml内容如下：${helloHome}是为虚拟机配置的本项目的路径

<?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="${helloHome}/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="${helloHome}/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="${helloHome}/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="${helloHome}/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>

<!-- OF-506: Jetty INFO messages are generally not useful. Ignore them by default. -->

<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>

到此配置完毕。

2.使用方法

public class HelloiServer {

private static final Logger Log = LoggerFactory.getLogger(HelloiServer.class);

public void aa()  {

Log.error("erroreeeeeeeeeeeeeeee");

}

}

这样日志就会记录到上面log4j.xml文件所配置的"${helloHome}/logs/error.log"路径下了