JSP 中Servlet的自己实现

JSP 中Servlet的自己实现

一 步骤

1、继承HttpServlet
2、重写doGet()或者doPost()方法
3、在web.xml中注册Servlet 

二 HttpServlet类继承图

三 实例

1、创建MyFirstServletDemo web project. 

2、编辑index.jsp

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 


 
 
 
 
  
  
   
  
  
  
 
 
 
 
第一个Servlet小例子
 Get方式请求HelloServlet
 

    
 
 

3、编写HelloServlet

package servlet;
 
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;
 
//继承于HttpServlet
public class HelloServlet extends HttpServlet {
 
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    // TODO Auto-generated method stub
    System.out.println("处理get（）请求...");
    PrintWriter out = response.getWriter();
    response.setContentType("text/html; charset=utf-8");
    out.println("Hello Servlet!
");
  }
 
  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    System.out.println("处理post（）请求...");
    PrintWriter out = response.getWriter();
    response.setContentType("text/html; charset=utf-8");
    out.println("Hello Servlet!
");
  }
 
}

4、编写web.xml

  
 
 index.jsp
 
 
  HelloServlet
  servlet.HelloServlet
 
 
   HelloServlet
   /servlet/HelloServlet
 

 

四 运行结果 

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