JavaNote 4.6 session中实现简单购物车功能_作业要求：通过session机制来实现购物车功能-优快云博客

本文链接：https://blog.youkuaiyun.com/LetsStudy/article/details/100999315

本文介绍了一种基于Servlet的购物车实现方式，通过在session中存储商品列表，实现了商品的添加与获取功能。文章提供了具体的Java代码示例，包括添加商品到购物车的Servlet处理逻辑及对应的HTML页面，以及从session中读取商品列表的Servlet代码。

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一、添加商品

package com.session;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@WebServlet(name = "AddServlet",urlPatterns = "/addcart")
public class AddServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String name = request.getParameter("name");
        HttpSession session = request.getSession();
        List list = (List)session.getAttribute("list");
        if(list==null){
//第一次访问时，session中没有attribute属性
             list = new ArrayList();
        }
        list.add(name);
        session.setAttribute("list",list);
        Cookie cookie = new Cookie("JSESSIONID", session.getId());
        cookie.setMaxAge(3600);
        cookie.setPath("/");
        response.addCookie(cookie);
    }
}
二、添加商品html
<body>
    <h1>商品列表</h1>
    <a href="/addcart?name=杯子">杯子</a>
    <a href="/addcart?name=书包">书包</a>
    <a href="/addcart?name=笔记本">笔记本</a>
</body>

三、获取商品

package com.session;

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 java.io.IOException;
import java.util.List;

@WebServlet(name = "GetCartServlet",urlPatterns = "/recart")
public class GetCartServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        HttpSession session = request.getSession();
        List<String> list = (List)session.getAttribute("list");
        response.setContentType("text/html;charset=utf-8");
        for(String s : list){
            response.getWriter().write(s);
        }
    }
}