Log4j的使用

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我的下载地址：http://download.csdn.net/download/l294333475/7855161

1、需要导入com.springsource.org.apache.commons.logging-1.1.1.jar和com.springsource.org.apache.log4j-1.2.15.jar

2、web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <display-name></display-name>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>     <servlet><servlet-name>Log4jInit</servlet-name><servlet-class>com.liupeng.servlet.Log4jInitServlet</servlet-class><init-param> <param-name>log4j</param-name><param-value>/WEB-INF/log4j.xml</param-value>  </init-param><load-on-startup>0</load-on-startup>  </servlet>       <servlet><servlet-name>testLog4j</servlet-name><servlet-class>com.liupeng.servlet.TestLog4jServlet</servlet-class>  </servlet>  <servlet-mapping><servlet-name>testLog4j</servlet-name><url-pattern>/testLog4j</url-pattern>  </servlet-mapping></web-app>

3、log4j.xml

<?xml version="1.0" encoding="GBK" ?>    <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">    <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">          <!-- 输出日志到控制台  ConsoleAppender -->       <appender name="console"           class="org.apache.log4j.ConsoleAppender">          <param name="Threshold" value="info"></param>          <layout class="org.apache.log4j.TTCCLayout">              <param name="ConversionPattern" value="TTCCLayout"></param>          </layout>      </appender>        <!-- 输出日志到文件  每天一个文件 -->      <appender name="dailyRollingFile"          class="org.apache.log4j.DailyRollingFileAppender">          <param name="Threshold" value="info"></param>          <param name="ImmediateFlush" value="true"></param>          <param name="File" value="d:/liupeng/logs/dailyRollingFile.log"></param>          <param name="DatePattern" value="'.'yyyy-MM-dd'.log'"></param>          <layout class="org.apache.log4j.PatternLayout">              <param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm:ss\} %-5p] [%t] {%c:%L}-%m%n"></param>          </layout>      </appender>             <!-- 输出日志到文件  文件大小到达指定尺寸的时候产生一个新的文件 -->      <appender name="railyFile"           class="org.apache.log4j.RollingFileAppender">          <param name="File" value="d:/liupeng/logs/railyFile.log"></param>          <param name="ImmediateFlush" value="true"/>          <param name="Threshold" value="info"></param>          <param name="Append" value="true"></param>          <param name="MaxFileSize" value="30KB"></param>          <param name="MaxBackupIndex" value="100"></param>          <layout class="org.apache.log4j.PatternLayout">              <param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm:ss\} %-5p] [%t] {%c:%L}-%m%n"></param>          </layout>      </appender>        <!-- 输出日志到文件 -->      <appender name="file"          class="org.apache.log4j.FileAppender">          <param name="File" value="d:/liupeng/logs/error.log"></param>          <param name="Threshold" value="error"></param>          <layout class="org.apache.log4j.PatternLayout">              <param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm:ss\} %-5p] [%t] {%c:%L}-%m%n"></param>          </layout>      </appender>        <!--           定义全局的日志输出级别,但是在输出目的地的配置中配置的具体输出级别优先级高于全局定义的优先级。          如果在railyFile中定义<param name="Threshold" value="info"></param>，那么将会把info以上级别的信息输出       -->      <root>               <priority value="debug" />               <appender-ref ref="console" />            <appender-ref ref="dailyRollingFile" />            <!-- <appender-ref ref="railyFile" />     -->        <appender-ref ref="file" />        </root>           </log4j:configuration>

4、TestLog4jServlet

package com.liupeng.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;public class TestLog4jServlet extends HttpServlet {private final static Log logger = LogFactory.getLog(TestLog4jServlet.class);@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {logger.info("testInfo");logger.error("testError");logger.debug("testDebug");}@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}}

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