servlet+jsp+java实现Web应用

时间：2022-05-24 06:12:46

servlet+jsp+java实现Web应用

环境：

1，eclipse
2，tomcat
3，eclipse tomcat 插件

开发过程：

1，建立一个Dynamic Web Project

2，创建一个欢迎页面

页面可以是jsp/html，我们选择一个jsp页面（放在WebContent内）

<%@ 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，向工程添加一个servlet文件

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!");

         //带参跳到另一个页面

         request.setAttribute("token", token);

         request.getRequestDispatcher("welcome.jsp").forward(request,response);

    }

}

4，创建welcome.jsp页面，并接受参数值

<%@ 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，创建一个web.xml

web.xml用来建立servlet与jsp的关系（需要放在WEB-INF内）。

　  根据不同的url来调用不同的servlet来进行处理。

<?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>//要与下面的名称相同

    <servlet-class>com.example.Welcome</servlet-class>//调用的类的位置

   </servlet>

   <servlet-mapping>

    <servlet-name>Welcome</servlet-name>

    <url-pattern>/hello.do</url-pattern>//url标识

  </servlet-mapping>

</web-app>

6，测试地址：http://localhost:8080/webtest/hello.do

7，可能会提示：HTTP method GET is not supported by this URL

解决方案：

public void doPost(HttpServletR……

改成：

public void service(HttpServletR……

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