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在展示购物车这个页面可以看到自己的订单，并且可以修改商品的数量，并更新总价，还可以删除商品。
当在购物大厅点击购买时，提交给GoShowMyCart这个servlet处理
GoShowMyCart.java
public class GoShowMyCart extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
MyCart myCart=(MyCart)request.getSession().getAttribute("myCart");
//把要显示的数据放入request，准备显示。
request.setAttribute("bookList", myCart.showMyCart());
request.setAttribute("totalPrice", myCart.getTotalPrice()+"");
request.getRequestDispatcher("/WEB-INF/showMyCart.jsp").forward(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
然后跳转到showMyCart.jsp页面
showMyCart.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
import="java.util.*,com.wxh.domain.*"
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>Insert title here</title>
</head>
<body style="text-align:center; margin:0 auto; ">
<h1>我的购物车</h1>
<%-- <a href="/shopping/GoHallUI?id=<%=((Users)session.getAttribute("loginUser")).getId()%>&&password=<%=((Users)session.getAttribute("loginUser")).getPwd()%>">返回购物大厅</a> --%>
<a href="/shopping/GoHallUI">返回购物大厅</a>
<form action="/shopping/ShoppingClServlet?type=update" method="post">
<table border="1"style="border-collapse: collapse; width: 600px " align="center">
<tr><th>BookID</th><th>书名</th><th>价格</th><th>出版社</th><th>数量</th><th>是否删除</th></tr>
<%
//从request中取出要显示的商品信息
ArrayList al=(ArrayList)request.getAttribute("bookList");
for(int i=0;i<al.size();i++){
Book book=(Book)al.get(i);
%>
<tr><td><%=book.getId() %><input type="hidden" name="id" value="<%=book.getId() %>"/></td><td><%=book.getName()%></td><td><%=book.getPrice() %></td>
<td><%=book.getPublishHouse() %></td><td><input type="text" name="booknum" value="<%=book.getShoppingNum()%>"/>本
</td><td><a href="/shopping/ShoppingClServlet?type=del&id=<%=book.getId()%>">删除</a></td></tr>
<%
}
%>
<tr><td colspan="6"><input type="submit" value="update"></td></tr>
<tr><td colspan="6">购物车的总价格是 ：${totalPrice} 元</td></tr>
</table>
</form>
<a href="/shopping/GoMyOrderServlet">提交订单</a>
</body>
</html>这里的数量修改和删除都交给ShoppingClServlet处理
点击提交订单以后交给GoMyOrderServlet处理。
——摘自《韩顺平细说jsp》
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原文地址：http://blog.csdn.net/hoho_12/article/details/51366893
