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   源码介绍

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实现书籍的增删改查，购买和后台管理功能

package com.bookStore.client.cart.handler;

import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.internal.util.AlipaySignature;
import com.alipay.api.request.AlipayTradePagePayRequest;
import com.bookStore.client.cart.service.ICartService;
import com.bookStore.client.product.service.IProductService;
import com.bookStore.commons.beans.Order;
import com.bookStore.commons.beans.Product;
import com.bookStore.commons.beans.User;
import com.bookStore.utils.AlipayConfig;
import com.bookStore.utils.IdUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

@Controller
@RequestMapping("/client/cart")
public class CartHandler {

    @Autowired
    private IProductService productService;

    @Autowired
    private ICartService cartService;

    @RequestMapping("/addCart.do")
    //id：商品的唯一标识符
    public String addCart(String id, HttpSession session,HttpServletRequest request){
        //根据id查询把哪本书添加到购物车
        Product product = productService.findProductById(id);
        System.out.println(product);
        //第一次往购物车添加商品，创建购物车cart，以后购买就不在需要创建购物车
        // <Product ,Integer>：指定键值对的类型
        //(Map<Product,Integer>)：session只能是Object类型的，所以得强转
        //先从session中获取购物车
        Map<Product ,Integer> cart = (Map<Product,Integer>)session.getAttribute("cart");
        //如果cart == null
        if (cart == null){
            //创建购物车
            cart = new HashMap<Product ,Integer>();
        }
        //当key重复时，put方法返回原来的value值
        Integer count = cart.put(product,1);
        //若count原来有值，则购物车存在这本书
        if (count != null){
            //原来的购物车的值 1
            cart.put(product,count 1);
        }
        session.setAttribute("cart",cart);
        return "/client/cart.jsp";

    }

    @RequestMapping("/changeCart.do")
    public String changeCart(String id,Integer count,HttpSession session){
        //根据id获取哪个商品，获取改变数量的商品信息
        Product product = productService.findProductById(id);
       //从session中获取原来的购物车原始数据
        Map<Product,Integer>cart = (Map<Product,Integer>)session.getAttribute("cart");
        //如果商品的数量为0，从购物车中删除该商品信息
        if (count == 0){
            //购物车是map类型的，删除时使用remov，可以删除主键
            cart.remove(product);
        }else {
            //改变购物车中商品的数量
            cart.put(product,count);
        }
        //返回到购物车
        return "/client/cart.jsp";
    }

   @RequestMapping("/createOrder.do")
    public String createOrder(Order order, HttpSession session, Model model) throws Exception{
        //获取下订单的用户信息
        User login_user = (User) session.getAttribute("login_user");
        //获取订单的购物车
        Map<Product,Integer>cart = (Map<Product, Integer>) session.getAttribute("cart");
        order.setId(IdUtils.getUUID());
        order.setUser(login_user);
        //创建订单
        cartService.createOrder(order,cart);
        //把创建完订单后的购物车删除
        session.removeAttribute("cart");
        model.addAttribute("order",order);
        return "/client/confirm.jsp";
    }
    //在“我的账户”-“订单查询”-“未支付”去支付
    @RequestMapping("/goPay.do")
    public String goPay(Order order,String id,String moeny,HttpSession session,Model model){
        //获取下订单的用户信息
        User login_user = (User) session.getAttribute("login_user");
        //获取订单的购物车
        Map<Product,Integer>cart = (Map<Product, Integer>) session.getAttribute("cart");
        order.setUser(login_user);
        //把创建完订单后的购物车删除
        session.removeAttribute("cart");
        model.addAttribute("order",order);
        return "/client/confirm.jsp";
    }

    @RequestMapping("/pay.do")
    public void pay(String id, String money, String name, HttpServletResponse response) throws Exception {
        //获得初始化的AlipayClient
        AlipayClient alipayClient = new DefaultAlipayClient(AlipayConfig.gatewayUrl, AlipayConfig.app_id, AlipayConfig.merchant_private_key, "json", AlipayConfig.charset, AlipayConfig.alipay_public_key, AlipayConfig.sign_type);

        //设置请求参数
        AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();
        alipayRequest.setReturnUrl(AlipayConfig.return_url);
        alipayRequest.setNotifyUrl(AlipayConfig.notify_url);

        //商户订单号，商户网站订单系统中唯一订单号，必填
        String out_trade_no = id;
        //付款金额，必填
        String total_amount = money;
        //订单名称，必填
        String subject = name;
        //商品描述，可空
        String body = "";

        alipayRequest.setBizContent("{\"out_trade_no\":\""  out_trade_no  "\","
                  "\"total_amount\":\""  total_amount  "\","
                  "\"subject\":\""  subject  "\","
                  "\"body\":\""  body  "\","
                  "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");

        //请求
        String result = alipayClient.pageExecute(alipayRequest).getBody();

        response.setContentType("text/html");
        //输出
        response.getWriter().println(result);

    }

    @RequestMapping("/paysuccess.do")
    public String paysuccess(HttpServletRequest request) throws Exception {
        //获取支付宝GET过来反馈信息
        Map<String,String> params = new HashMap<String,String>();
        Map<String,String[]> requestParams = request.getParameterMap();
        for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext();) {
            String name = (String) iter.next();
            String[] values = (String[]) requestParams.get(name);
            String valueStr = "";
            for (int i = 0; i < values.length; i  ) {
                valueStr = (i == values.length - 1) ? valueStr   values[i]
                        : valueStr   values[i]   ",";
            }
            //乱码解决，这段代码在出现乱码时使用
            valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8");
            params.put(name, valueStr);
        }

        boolean signVerified = AlipaySignature.rsaCheckV1(params, AlipayConfig.alipay_public_key, AlipayConfig.charset, AlipayConfig.sign_type); //调用SDK验证签名

        //——请在这里编写您的程序（以下代码仅作参考）——
        if(signVerified) {
            //商户订单号
            String id = new String(request.getParameter("out_trade_no").getBytes("ISO-8859-1"),"UTF-8");

            //支付宝交易号
            String trade_no = new String(request.getParameter("trade_no").getBytes("ISO-8859-1"),"UTF-8");

            //付款金额
            String total_amount = new String(request.getParameter("total_amount").getBytes("ISO-8859-1"),"UTF-8");
            //付款成功之后，去修改订单的付款状态，支付状态变为1
            cartService.paySuccess(id);  //传的参数是这次付款成功的订单号，这次付款成功的订单
            return "/client/paysuccess.jsp";
        }else {
            return "/client/payfail.jsp";
        }
    }
}