<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<jsp:forward page="list.do"></jsp:forward>
package web;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.ProductDao;
import dao.common.DaoFactory;
import entity.Product;
@WebServlet(urlPatterns="/list.do")
public class ProductServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = -7119542366400700217L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
try {
ProductDao pdao = DaoFactory.getInstance("productDao", ProductDao.class);
List<Product> list=pdao.findAll();
req.setAttribute("productList", list);
req.getRequestDispatcher("list.jsp").forward(req, resp);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
<%@ page language="java" import="java.util.*,entity.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'list.jsp' starting page</title>
</head>
<body>
<h3>产品信息列表</h3>
<form>
<table>
<tr>
<th>ID</th>
<th>Name</th>
<th>Price</th>
<th>Operation</th>
</tr>
<%
List<Product> list=(List<Product>)request.getAttribute("productList");
int size=list.size()>0?list.size():0;
for(int i=0;i<size;i++){
Product p=list.get(i);
%>
<tr>
<td><%=p.getId() %></td>
<td><%=p.getName() %></td>
<td><%=p.getPrice() %></td>
<td><a href="addcar.do?id=<%=p.getId() %>">加入购物车</a></td>
</tr>
<%} %>
</table>
</form>
</body>
</html>
package web;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@WebServlet(urlPatterns="/addcar.do")
public class AddCarServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 260407340529396028L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//获取产品ID
String id=req.getParameter("id");
//创建一个HttpSession会话
HttpSession session=req.getSession();
//创建一个用了保存产品信息的map集合,键表示产品id,值表示产品数量
Map<Integer,Integer> map=(Map)session.getAttribute("shopcar");
if(map==null||map.size()==0){
map=new HashMap<Integer,Integer>();
}
int productId=Integer.parseInt(id);
Integer count=map.get(productId);//根据产品id获取指定产品的数量
if(count!=null){//说明购物车中，已经存在了该款产品
map.put(productId, count+1);
}else{
map.put(productId, 1);
}
session.setAttribute("shopcar", map);
req.getRequestDispatcher("/info.jsp").forward(req, resp);
}
}
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>产品信息提示页面</title>
</head>
<body>
<h3>产品成功添加到购物车</h3>
<hr/>
<a href="index.jsp">继续购物</a><br/>
<a href="viewcar.do">结算</a>
</body>
</html>
package web;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import dao.ProductDao;
import dao.common.DaoFactory;
import entity.Product;
@WebServlet(urlPatterns="/viewcar.do")
public class ViewCarServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//获取当前客户端和服务器端的会话
HttpSession session=req.getSession();
//获取购物车
Map<Integer,Integer> map=(Map<Integer,Integer>)session.getAttribute("shopcar");
//再次创建一个Map集合，键表示产品对象，值表示产品的数量
Map<Product,Integer> map2=new HashMap<>();
//
try {
ProductDao pDao=DaoFactory.getInstance("productDao", ProductDao.class);
//循环获取购物车中，每个产品的信息和数量，并且再次保存到mp2集合中。
for(Entry<Integer, Integer> entry:map.entrySet()){
Product p=pDao.get(entry.getKey());
map2.put(p, entry.getValue());
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
req.setAttribute("map2", map2);
req.getRequestDispatcher("/viewcar.jsp").forward(req, resp);
}
}
<%@ page language="java" import="java.util.Map.*,entity.*,java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'viewcar.jsp' starting page</title>
<script type="text/javascript">
function add(i,price){
var count=document.getElementById("count"+i).value;
var total=document.getElementById("total").value;
document.getElementById("count"+i).value=(parseInt(count)+1);
document.getElementById("total").value=(parseInt(total)+price);
}
function jian(i,price){
var count=document.getElementById("count"+i).value;
var total=document.getElementById("total").value;
if(count>1){
document.getElementById("count"+i).value=(parseInt(count)-1);
document.getElementById("total").value=(parseInt(total)-price);
}else{
alert("亲，你真的不要我了吗？");
}
}
</script>
</head>
<body>
<h3>购物车列表页面</h3>
<table>
<tr>
<th>ID</th>
<th>Name</th>
<th>Price</th>
<th>数量</th>
<th>操作</th>
</tr>
<%
Map<Product,Integer> map=(Map<Product,Integer>)request.getAttribute("map2");
int i=0;
double total=0;
for(Entry<Product, Integer> entry:map.entrySet()){
Product p=entry.getKey();
i++;
total+=p.getPrice()*entry.getValue();
%>
<tr>
<td> <%=i %></td>
<td> <%=p.getName() %></td>
<td> <%=p.getPrice() %></td>
<td> <%=entry.getValue() %></td>
<td>
<input type="button" value="+" onclick="add(<%=i%>,<%=p.getPrice()%>)"/>
<input type="text" name="count" id="count<%=i %>" value="<%=entry.getValue()%>"/>
<input type="button" value="-" onclick="jian(<%=i%>,<%=p.getPrice()%>)"/>
</td>
</tr>
<%} %>
<tr>
<td colspan="4">
总价:<input type="text" name="total" id="total" value="<%=total %>" disabled="disabled"> <input type="button" value="去结算"/>
</td>
</tr>
</table>
</body>
</html>
