JavaWEB版本Log4J的Demo

package com.lxt008; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.log4j.PropertyConfigurator; public class J2eeLog4jDemo extends HttpServlet { /** * Constructor of the object. */ public J2eeLog4jDemo() { super(); } public void destroy() { super.destroy(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } public void init() throws ServletException { //通过web.xml来动态取得配置文件 String prefix = getServletContext().getRealPath("/"); String file = getInitParameter("log4j"); //如果没有给出相应的配置文件，则不进行初始化 if(file != null) { PropertyConfigurator.configure(prefix+file); } } }