log4j.xml配置实现配置实现配置实现配置实现
先写一个Servlet的listener,用来监听服务启动,并自动解析log4j.xml文件 代码如下:
import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import org.apache.log4j.LogManager; import org.apache.log4j.PropertyConfigurator; import org.apache.log4j.xml.DOMConfigurator; public class Log4jConfigListener implements ServletContextListener{ public static final String CONFIG_LOCATION_PARAM = "log4jConfigLocation"; public static final String XML_FILE_EXTENSION = ".xml"; public void contextDestroyed(ServletContextEvent event) { // TODO Auto-generated method stub LogManager.shutdown(); } public void contextInitialized(ServletContextEvent event) { // TODO Auto-generated method stub String location = event.getServletContext().getInitParameter(CONFIG_LOCATION_PARAM); if (location != null) { if (!location.startsWith("/")) { location = "/" + location; } location = event.getServletContext().getRealPath(location); //如果是xml结尾就用DOM解析,否则就用properties解析 if (location.toLowerCase().endsWith(XML_FILE_EXTENSION)) { DOMConfigurator.configure(location); }else { PropertyConfigurator.configure(location); } } } }
再写个util类,用来生成所要的不同类型的日志
代码如下:
package com.zhaopin.util; import org.apache.log4j.Logger; public class Log4jUtil { public static Logger getSQLLogger(){ return Logger.getLogger("sql"); } public static Logger getBusinessLogger(){ return Logger.getLogger("business"); } public static Logger getSimpleErrorLogger(){ return Logger.getLogger("simpleError"); } public static Logger getNormalErrorLogger(){ return Logger.getLogger("normalError"); } }
下面开始写配置文件,先要在web.xml下添加信息
下面开始写配置文件,先要在web.xml下添加信息
<context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/Log4j.xml</param-value> </context-param> <!-- 加载log4j配置文件 --> <listener> <listener-class>Log4jConfigListener</listener-class> </listener>
最重要的log4j.xml的配置信息如下:
<?xml version="1.0" encoding="GBK"?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender"> <param name="target" value="System.out"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] (%C:%L) - %m%n"/> </layout> </appender> <!-- SQL类日志 --> <appender name="sql" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="/usr/local/tomcat/logs/testlog4j.sql.log"/> <param name="Append" value="true"/> <!-- name="DatePattern" 配置这条信息是让日志每天自动生成,名字尾部追加日期格式, 第一天生成的日志需第二天才能看到log 可以通过更改系统时间来看日志的输出 --> <param name="DatePattern" value="'.'yyyy-MM-dd"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] (%C:%L) - %m%n"/> </layout> </appender> <!-- 业务类日志 --> <appender name="business" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="/usr/local/tomcat/logs/testlog4j.business.log"/> <param name="Append" value="true"/> <param name="DatePattern" value="'.'yyyy-MM-dd"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] (%C:%L) - %m%n"/> </layout> </appender> <!-- 不带执行轨迹错误日志 --> <appender name="simpleError" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="/usr/local/tomcat/logs/testlog4j.error.simple.log"/> <param name="Append" value="true"/> <param name="DatePattern" value="'.'yyyy-MM-dd"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] (%C:%L) - %m%n"/> </layout> </appender> <!-- 带执行轨迹错误日志 --> <appender name="normalError" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="/usr/local/tomcat/logs/testlog4j.error.normal.log"/> <param name="Append" value="true"/> <param name="DatePattern" value="'.'yyyy-MM-dd"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] (%C:%L) - %m%n"/> </layout> </appender> <logger name="sql" additivity="true"> <priority value="info"/> <appender-ref ref="sql"/> </logger> <logger name="business" additivity="true"> <priority value="info"/> <appender-ref ref="simpleError"/> </logger> <logger name="simpleError" additivity="true"> <priority value="info"/> <appender-ref ref="simpleError"/> </logger> <logger name="normalError" additivity="true"> <priority value="info"/> <appender-ref ref="normalError"/> </logger> <root> <appender-ref ref="STDOUT"/> <priority value="info"/> </root> </log4j:configuration>
在程序中应用时需要编写如下代码: Log4jUtil.getBusinessLogger().info("message!");