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