src/com/shop/service/OsProductCartService.java

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package com.shop.service;

import com.shop.dao.OsProductMapper;
import com.shop.dao.OsProductSpecificationMapper;
import com.shop.dao.OsSpecificationAttributeMapper;
import com.shop.po.OsProduct;
import com.shop.po.OsProductSpecification;
import com.shop.po.OsSpecificationAttribute;
import com.shop.vo.CartVO;
import com.shop.vo.ShoppingCartVO;
import net.sf.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

/**
 * @Author 康健
 * @Date 2017/8/11 16:15
 */
@Service
public class OsProductCartService {

    @Autowired
    private OsProductSpecificationMapper osProductSpecificationMapper;
    @Autowired
    private OsProductMapper osProductMapper;
    @Autowired
    private OsSpecificationAttributeMapper osSpecificationAttributeMapper;

    //添加购物车商品
    public CartVO insertProductCart(Long productSpecNumber, HttpSession session) {
        OsProductSpecification osProductSpecification = osProductSpecificationMapper.selectByProductSpecNumber(productSpecNumber);

        CartVO cartVO = (CartVO) session.getAttribute("cart");
        //如果当前商品有规格，规格商品已在购物车 数量加1
        if(osProductSpecification != null && (!"".equals(osProductSpecification.getSpec()))) {
            Boolean flag = false;
            List<ShoppingCartVO> shoppingCartVOs = cartVO.getShoppingCartVOs();
            for (ShoppingCartVO vo : shoppingCartVOs) {
                if (osProductSpecification.getProductSpecNumber().longValue()==(vo.getProductSpecNumber().longValue())) {
                    vo.setBuyNumber(vo.getBuyNumber() + 1);
                    flag = true;
                    break;
                }
            }
            if (flag == false) {
                //如果当前商品不在购物车 新建vo并加入
                ShoppingCartVO shoppingCartVO = new ShoppingCartVO();
                shoppingCartVO.setProductSpecNumber(osProductSpecification.getProductSpecNumber());
                shoppingCartVO.setBuyNumber(1);
                shoppingCartVO.setStock(osProductSpecification.getStock());
                shoppingCartVO.setSalesVolume(osProductSpecification.getSalesVolume());
                shoppingCartVO.setPrice(osProductSpecification.getPrice());
                shoppingCartVO.setSpec(osProductSpecification.getSpec());

                shoppingCartVO.setProductNumber(osProductMapper.selectProductNumberByProductId(osProductSpecification.getProductId()));