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"; } }
