Java Servlet实现购物车(Session实例)

    技术2022-05-12  1

    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";     } }


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