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servlet+jsp+java實現Web應用
環境：
1，eclipse
2，tomcat
3，eclipse tomcat 外掛程式
開發過程：
1，建立一個Dynamic Web Project
2，建立一個歡迎頁面
頁面可以是jsp/html，我們選擇一個jsp頁面（放在WebContent內）
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body><h1>Do you come in?</h1><form method="post" action="hello.do"> Select:<br> <select> <option>yes <option>no </select> <center> <input type="submit"> </center></form></body></html>
3，向工程添加一個servlet檔案
package com.example;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class Welcome */@WebServlet("/Welcome")public class Welcome extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub response.setContentType("text/html"); PrintWriter out = response.getWriter(); String c = request.getParameter("select"); if(c.equals("yes")) out.print("Welcome!"); else out.print("I don‘t like you!"); //帶參跳到另一個頁面 request.setAttribute("token", token); request.getRequestDispatcher("welcome.jsp").forward(request,response); }}
4，建立welcome.jsp頁面，並接受參數值
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title><%String token = request.getParameter("token");//用request得到 %><style> #ifr_fr{ width: 84%; height: 700px; } </style> </head><body >welcome to rzzx1.<iframe id="ifr_fr" name="ifr_fr" frameborder="0" src=""></iframe></body></html>
5，建立一個web.xml
web.xml用來建立servlet與jsp的關係（需要放在WEB-INF內）。
根據不同的url來調用不同的servlet來進行處理。
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <display-name></display-name> <servlet> <servlet-name>Welcome</servlet-name>//要與下面的名稱相同 <servlet-class>com.example.Welcome</servlet-class>//調用的類的位置 </servlet> <servlet-mapping> <servlet-name>Welcome</servlet-name> <url-pattern>/hello.do</url-pattern>//url標識 </servlet-mapping></web-app>
6，測試地址：http://localhost:8080/webtest/hello.do
7，可能會提示：HTTP method GET is not supported by this URL
解決方案：
public void doPost(HttpServletR……改成：public void service(HttpServletR……
servlet+jsp+java實現Web應用
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