servlet 项目

1.Servlet基础类，必须继承HttpServlet

 package com.fan;

 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;

 public abstract class ServletBase extends HttpServlet {
     public HttpServletRequest request = null;
     public HttpServletResponse response = null;

     public ServletBase() {
     }

     public void init() throws ServletException {
         // Put your code here
         System.out.println("init");
         BeginInit();
     }

     public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         System.out.println("doGet");
         this.request = request;
         this.response = response;
         BeginGetIn("Get");
     }

     public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         System.out.println("doPost");
         this.request = request;
         this.response = response;
         BeginGetIn("Post");
     }

     public abstract void BeginGetIn(String Falg);

     public abstract void BeginInit();

     public void OutPut(String str) {
         try {
             if (this.response != null) {
                 PrintWriter out = this.response.getWriter();
                 out.println(str);
                 out.flush();
                 out.close();
             }
         } catch (Exception e) {
             // TODO: handle exception
         }
     }
 }// end

2.子类

 package com.fan;

 public class HelloWorld extends ServletBase{

     @Override
     public void BeginGetIn(String Falg) {
         // TODO Auto-generated method stub
         System.out.println(Falg);
         OutPut(Falg);
     }

     @Override
     public void BeginInit() {
         // TODO Auto-generated method stub
         System.out.println("init2");
     }

 }

3.配置文件web.xml

4.请求地址

http://localhost:8888/项目名/servlet/ServletBase