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+"/";
%
 
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
 head
 base href="%=basePath%" rel="external nofollow" 
 
 titleMy JSP 'index.jsp' starting page/title
  meta http-equiv="pragma" content="no-cache"
  meta http-equiv="cache-control" content="no-cache"
  meta http-equiv="expires" content="0" 
  meta http-equiv="keywords" content="keyword1,keyword2,keyword3"
  meta http-equiv="description" content="This is my page"
  !--
  link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" 
  --
 /head
 
 body
 h1第一个Servlet小例子/h1
 a href="servlet/HelloServlet" rel="external nofollow" Get方式请求HelloServlet/a
 form action="servlet/HelloServlet" method="post"
    input type="submit" value="Post方式请求HelloServlet"
 /form
 /body
/html

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("strongHello Servlet!/strongbr");
  }
 
  @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("strongHello Servlet!/strongbr");
  }
 
}

4、编写web.xml

xml version="1.0" encoding="UTF-8"
web-app version="2.5"
  xmlns="http://java.*s*u*n.com/xml/ns/javaee";
  xmlns:xsi="http://www.***w3.org/2001/XMLSchema-instance";
  xsi:schemaLocation="http://java.*s*u*n.com/xml/ns/javaee
http://java.*s*u*n.com/xml/ns/javaee/web-app_2_5.xsd";
 display-name/display-name 
 welcome-file-list
 welcome-fileindex.jsp/welcome-file
 /welcome-file-list
 servlet
  servlet-nameHelloServlet/servlet-name
  servlet-classservlet.HelloServlet/servlet-class
 /servlet
 servlet-mapping
   servlet-nameHelloServlet/servlet-name
   url-pattern/servlet/HelloServlet/url-pattern
 /servlet-mapping
/web-app
 

四 运行结果

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