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Java Servlet实现购物车(Session实例)

 2009-10-25 16:35:20 来源:WEB开发网   
核心提示:1.jsp代码:(购物form) -- Document : testsession Created on : 2009-10-9, 15:05:55 Author : lucifer--%><%@page contentType="text/html" pageEncoding

1.jsp代码:(购物form)

--
   Document  : testsession
   Created on : 2009-10-9, 15:05:55
   Author   : lucifer
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!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=UTF-8">
     <title>JSP Page</title>
   </head>
   <body>
     <center>
        <h1>电器商场</h1>
     <form method="post" action="SessionServlet">
        <input type="checkbox" name="item" value="0">电视机<br>
        <input type="checkbox" name="item" value="1">电冰箱<br>
        <input type="checkbox" name="item" value="2">电脑<br>
        <input type="submit" name="submit" value="加入购物车">
     </form>
     </center>
   </body>
</html>

2.SessionServlet:


package MyServlet;

import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;

/**
 *
 * @author lucifer
 */
public class SessionServlet extends HttpServlet {

   PRotected void processRequest(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
     response.setContentType("text/html;charset=UTF-8");
     PrintWriter out = response.getWriter();
     String[] items = {"电视机","电冰箱","电脑"};
     HttpSession sess = request.getSession(true);
     Integer itemCount = (Integer)sess.getValue("itemCount");
     if(itemCount == null){
       itemCount = new Integer(0);
     }
     try {
       String[] itemSelected;
       String itemName;
       itemSelected = request.getParameterValues("item");
       if(itemSelected != null){
         for(int i = 0;i < itemSelected.length;i++){
            itemName = itemSelected[i];
            itemCount = new Integer(itemCount.intValue() + 1);
            sess.putValue("Item" + itemCount,itemName);
            sess.putValue("itemCount",itemCount);
         }
       }
       out.println("<html>");
       out.println("<head>");
       out.println("<title>Servlet SessionServlet</title>"); 
       out.println("</head>");
       out.println("<body>");
       out.println("<center><h1>您购物车中的东西为:</h1>");
       out.println("共挑选了" + itemCount + "件电器<br>");
       for(int i = 1;i <= itemCount.intValue();i++){
         String item = (String)sess.getValue("Item" + i);
         out.println(items[Integer.parseInt(item)]);
         out.println("<br>");
       }
       out.println("<a href = \"ShowCart.jsp\">继续挑选</a>");
       out.println("</center></body>");
       out.println("</html>");
     } finally {
       out.close();
     }
   }

   @Override
   protected void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
     processRequest(request, response);
   }


   @Override
   protected void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
     processRequest(request, response);
   }

   @Override
   public String getServletInfo() {
     return "Short description";
   }

}

Tags:Java Servlet 实现

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