session的典型案例一:使用session实现购物车

来源：互联网发布：sqlserver删除历史数据编辑：程序博客网时间：2024/05/17 23:44

使用session实现购物车

step1.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="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%>">        <title>商品列表</title>      </head>    <body>    <h4>商品列表</h4>    <form action="<%=basePath%>servlet/step2" method="post">       <table border="1px">         <tr>           <td>商品名称</td>           <td>选择</td>         </tr>         <tr>           <td>java</td>           <td><input type="checkbox" name="book" value="java"></td>         </tr>                  <tr>           <td>c</td>           <td><input type="checkbox" name="book" value="c"></td>         </tr>                  <tr>           <td>c++</td>           <td><input type="checkbox" name="book" value="c++"></td>         </tr>               </table>       <input type="submit" value="确认">    </form>  </body></html>

step2.java:

package com.sa.shopping;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;import javax.servlet.http.HttpSession;public class step2 extends HttpServlet {public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException{          //1.获取选中的商品信息String[] books=request.getParameterValues("book");  //2.将商品放入sessionHttpSession session=request.getSession();session.setAttribute("book", books);//3.重定向到step2String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";response.sendRedirect(basePath+"/shopping/step2.jsp");}}

step2.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="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%>">        <title>My JSP 'step1.jsp' starting page</title>  </head>    <body>    <h4>填写收件人，地址</h4>    <form action="<%=basePath%>servlet/step3" method="post">        收件人:<input type="text" name="receiver"><br>        地址:<input type="text" name="addr"><br>        <input type="submit" value="提交">    </form>  </body></html>

step3.java:

package com.sa.shopping;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;import javax.servlet.http.HttpSession;public class step3 extends HttpServlet {public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {             String receiver=request.getParameter("receiver");             String addr=request.getParameter("addr");             HttpSession session=request.getSession();             session.setAttribute("receiver", receiver);             session.setAttribute("addr", addr);     String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";    response.sendRedirect(basePath+"/shopping/step3.jsp");}}

step3.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="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%>">        <title>My JSP 'step1.jsp' starting page</title>      </head>    <body>    <h4>信息总览</h4>    <form action="<%=basePath%>servlet/pay" method="post">      <%String[] books=(String[])session.getAttribute("book"); %>        商品:<%=Arrays.asList(books) %><br>   收件人:<%=session.getAttribute("receiver") %><br>   地址:<%=session.getAttribute("addr") %><br>       <input type="submit" value="付款">    </form>  </body></html>

测试:

阅读全文

0 0