关于java web项目使用log4j

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pom.xml中添加依赖。

<dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency>

maven会自动添加相应的jar包

配置log4j初始化用的servlet

web.xml中添加下面servlet

<servlet><servlet-name>log4j-init</servlet-name><servlet-class>com.suyang.servlet.Log4jInit</servlet-class><init-param><param-name>log4j-init-file</param-name><param-value>\WEB-INF\classes\log4j.properties</param-value></init-param><load-on-startup>1</load-on-startup></servlet>

添加对应的servlet

Log4jInit.java

package com.suyang.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.log4j.PropertyConfigurator;/** * Servlet implementation class Log4jInit */public class Log4jInit extends HttpServlet {private static final long serialVersionUID = 1L;@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {// TODO Auto-generated method stubsuper.doGet(req, resp);}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {// TODO Auto-generated method stubsuper.doPost(req, resp);}@Overridepublic void init() throws ServletException {// TODO Auto-generated method stubsuper.init();String prefix = getServletContext().getRealPath("/");String file = getInitParameter("log4j-init-file");if (file != null) {System.out.println("read log4j.properties:"+prefix + file);PropertyConfigurator.configure(prefix + file);}}}

在resources中添加log4j.properties文件，maven会自动把文件复制到classes目录下

log4j.rootLogger = DEBUG , stdout , Dlog4j.appender.stdout = org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.Target = System.outlog4j.appender.stdout.layout = org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%nlog4j.appender.D = org.apache.log4j.DailyRollingFileAppenderlog4j.appender.D.Threshold= DEBUGlog4j.appender.D.File= ${catalina.home}/logs/log.loglog4j.appender.D.ImmediateFlush= truelog4j.appender.D.Append= truelog4j.appender.D.DatePattern='-'yyyy-MM-dd-HH'.log'log4j.appender.D.Encoding= UTF-8log4j.appender.D.layout= org.apache.log4j.PatternLayoutlog4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n

日志会自动记录DEBUG级别以上的日志。

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