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";
}
}