加入购物车
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Add2CartServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置编码
response.setContentType("text/html;charset=utf-8");
PrintWriter writer = response.getWriter();
//获取商品的名称
String name=request.getParameter("name");
name=new String(name.getBytes("iso-8859-1"),"utf-8");
//将商品添加到购物车中
//从session中获取购物车
Map<String,Integer> car=(Map<String, Integer>) request.getSession().getAttribute("cart");
Integer count=null;
//判断购物车是否为空
if(car==null){
//第一次购物 创建购物车
car=new HashMap<String, Integer>();
//将购物车放入session中
request.getSession().setAttribute("cart", car);
count=1;
}else{
//购物车不为空,继续判断购物车中是否有该商品
count=car.get(name);
if(count==null){
//购物车没有该商品
count=1;
}else{
//购物车中有该商品
count++;
}
}
//将商品放入到购物车中
car.put(name, count);
writer.println("已经将<b>"+name+"</b>添加到购物车中<hr/>");
writer.print("<a href='/cookie/product_list.jsp'>继续购物</a>");
writer.print("<a href='/cookie/cart.jsp'>查看购物车</a>");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
cart.jsp
<%@ page import="java.util.Map" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
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>
<table border="1" align="center" width="50%">
<tr>
<td>商品名称</td>
<td>数量</td>
</tr>
<%
//1.获取购物车
Map<String,Integer> map = (Map<String,Integer>)session.getAttribute("cart");
//2.判断购物车是否为空
if(map==null){
//2.1若为空
out.print("<tr><td colspan='2'>亲,购物车空空,先逛逛</td></tr>");
}else{
//2.2若不为空 遍历购物车
for(String name:map.keySet()){
out.print("<tr>");
out.print("<td>");
out.print(name);
out.print("</td>");
out.print("<td>");
out.print(map.get(name));
out.print("</td>");
out.print("</tr>");
}
}
%>
</table>
<hr/>
<center>
<a href="/cookie/product_list.jsp">继续购物</a>
<a href="/cookie/clearcart">清空购物车</a>
</center>
</body>
</html>
清空购物车
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ClearCartServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//清空session
request.getSession().invalidate();
//重定向
response.sendRedirect(request.getContextPath()+"/cart.jsp");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}