JSP 中Servlet的自己實(shí)現(xiàn)
一 步驟
1、繼承HttpServlet
2、重寫(xiě)doGet()或者doPost()方法
3、在web.xml中注冊(cè)Servlet
二 HttpServlet類(lèi)繼承圖
三 實(shí)例
1、創(chuàng)建MyFirstServletDemo web project.
2、編輯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" >
title>My 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>第一個(gè)Servlet小例子/h1>
a href="servlet/HelloServlet" rel="external nofollow" >Get方式請(qǐng)求HelloServlet/a>
form action="servlet/HelloServlet" method="post">
input type="submit" value="Post方式請(qǐng)求HelloServlet">
/form>
/body>
/html>
3、編寫(xiě)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;
//繼承于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("處理get（）請(qǐng)求...");
PrintWriter out = response.getWriter();
response.setContentType("text/html; charset=utf-8");
out.println("strong>Hello Servlet!/strong>br>");
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("處理post（）請(qǐng)求...");
PrintWriter out = response.getWriter();
response.setContentType("text/html; charset=utf-8");
out.println("strong>Hello Servlet!/strong>br>");
}
}
4、編寫(xiě)web.xml
?xml version="1.0" encoding="UTF-8"?> web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd";> display-name>/display-name> welcome-file-list> welcome-file>index.jsp/welcome-file> /welcome-file-list> servlet> servlet-name>HelloServlet/servlet-name> servlet-class>servlet.HelloServlet/servlet-class> /servlet> servlet-mapping> servlet-name>HelloServlet/servlet-name> url-pattern>/servlet/HelloServlet/url-pattern> /servlet-mapping> /web-app>
四 運(yùn)行結(jié)果
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