javaweb商城秒杀系统--秒杀功能的实现(四)

1、秒杀页面的代码

2、秒杀的controller的实现
1.先判断库存是否还存在
2.判断是否是已经秒杀过了
3.库存还有，也没有下过订单而后就是 减库存 下订单 写入秒杀订单
4.将秒杀后的订单信息直接写入页面

@RequestMapping("/do_miaosha")
    public String doMiaosha(Model model, MiaoshaUser user, @RequestParam("goodsId") Long goodsId){

        model.addAttribute("user",user);
        if (user==null){
            return "login";
        }
     //先判断库存是否还存在
        GoodsVo goodsVo=goodsService.getGoosVoByGoodsId(goodsId);
        int stockCount=goodsVo.getStockCount();
        if(stockCount<=0){
            model.addAttribute("errmsg", CodeMsg.MIAO_SHA_OVER);
            return "miaosha_fail";
        }
        //判断是否是已经秒杀过了
     MiaoshaOrder miaoshaOrder=orderService.getMiaoshaOrderByUserIdGoodsId(user.getId(),goodsId);
        if(miaoshaOrder!=null){
            model.addAttribute("errmsg", CodeMsg.REPEATE_MIAOSHA);
            return "miaosha_fail";
        }
        //库存还有，也没有下过订单而后就是 减库存 下订单 写入秒杀订单
        //由于要知足事务的操做 因此 建一个单独的service

     OrderInfo orderInfo= miaoshaService.miaosha(user,goodsVo);

        //将秒杀后的订单信息直接写入页面
        model.addAttribute("orderInfo",orderInfo);
        //显示商品信息
        model.addAttribute("goods",goodsVo);

        return "order_detail";

3、秒杀的service的实现

/** * @Author:zhangyx * @Date:Created in 12:492018/11/17 * @Modified By: */
@Service
public class MiaoshaService {

    @Autowired
    private GoodsService goodsService;
    @Autowired
    private OrderService orderService;

   //作秒杀的操做
    @Transactional
    public OrderInfo miaosha(MiaoshaUser user, GoodsVo goodsVo) {
        //减小库存
        goodsService.reduceStock(goodsVo);
        //写订单
        return orderService.createOrder(user,goodsVo);
    }
}