1.点击按钮，表单提交到MiaoshaController

1.判断用户是否登录 没登录就跳转到login

2.判断库存 根据goodsId进行库存查询

3.如果已经秒杀到了，进入订单OrderService是否秒杀到了商品

package com.ryan.miaosha.controller;

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 org.springframework.web.bind.annotation.RequestParam;
import com.ryan.miaosha.dao.MiaoshaUser;
import com.ryan.miaosha.domain.CodeMsg;
import com.ryan.miaosha.domain.MiaoshaOrder;
import com.ryan.miaosha.domain.OrderInfo;
import com.ryan.miaosha.service.GoodsService;
import com.ryan.miaosha.service.MiaoshaGoodsService;
import com.ryan.miaosha.service.OrderService;
import com.ryan.miaosha.vo.GoodsVo;

@Controller
@RequestMapping("/miaosha")
public class MiaoshaController {
   @Autowired
   GoodsService goodsService;
   @Autowired
   OrderService orderService;
   @Autowired
   MiaoshaGoodsService miaoshaGoodsService;
    @RequestMapping("/do_miaosha")
    String doMiaosha(Model model,MiaoshaUser user,@RequestParam("goodsId")long goodsId) {
        model.addAttribute("user", user);
        if(user==null) 
        {return "login";}
        //判断库存
        GoodsVo goodsVoByGoodsId = goodsService.getGoodsVoByGoodsId(goodsId);
        if(goodsVoByGoodsId.getStockCount()<=0) {
            model.addAttribute("errmsg", CodeMsg.MIAOSHA_OVER.getMsg());
            return "miaosha_failure";
        }
        //判断是否同一个账号多次秒杀
        MiaoshaOrder miaoshaOrder=orderService.getMiaoshaOrderByUserIdGoodsId(user.getId(),goodsId);
        if(miaoshaOrder!=null) {
            model.addAttribute("errmsg", CodeMsg.REPEATE_MIAOSHA.getMsg());
            return "miaosha_failure";
        }
        //减库存、下订单、写入秒杀订单
        OrderInfo orderInfo=miaoshaGoodsService.miaosha(user,goodsVoByGoodsId);
        model.addAttribute("orderInfo", orderInfo);
        model.addAttribute("goods", goodsVoByGoodsId);
        return "order_detail";
    }
}

2.MiaoshaGoodsService

package com.ryan.miaosha.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.ryan.miaosha.dao.MiaoshaUser;
import com.ryan.miaosha.domain.OrderInfo;
import com.ryan.miaosha.vo.GoodsVo;

@Service
public class MiaoshaGoodsService {
    @Autowired
    GoodsService goodsService;
    @Autowired
    OrderService orderService;
    
    @Transactional
    public OrderInfo miaosha(MiaoshaUser user, GoodsVo goodsVo) {
        //减库存 下订单 写入秒杀订单
        goodsService.reduceStock(goodsVo);
        //order_info  miaosha_order
        return orderService.createOrder(user,goodsVo);
    }   
}

3. GoodsService

package com.ryan.miaosha.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.ryan.miaosha.dao.GoodsDao;
import com.ryan.miaosha.dao.User;
import com.ryan.miaosha.dao.UserDao;
import com.ryan.miaosha.domain.Goods;
import com.ryan.miaosha.domain.MiaoshaGoods;
import com.ryan.miaosha.vo.GoodsVo;

@Service
public class GoodsService {
    @Autowired
    GoodsDao goodsDao;
    public List<GoodsVo> listGoodsVo() {
        return goodsDao.listGoodsVo();
    }
    public GoodsVo getGoodsVoByGoodsId(long goodsId) {
        return goodsDao.getGoodsVoByGoodsId(goodsId);
    }
    public void reduceStock(GoodsVo goodsVo) {
        MiaoshaGoods g=new MiaoshaGoods();
        g.setGoodsId(goodsVo.getId());
        goodsDao.reduceStock(g);
    }
}

4.GoodsDao

package com.ryan.miaosha.dao;



import java.util.List;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.ryan.miaosha.domain.Goods;
import com.ryan.miaosha.domain.MiaoshaGoods;
import com.ryan.miaosha.vo.GoodsVo;

@Mapper
public interface GoodsDao {
    @Select("select g.*,mg.stock_count,mg.start_date,mg.end_date,mg.miaosha_price from miaosha_goods mg left join goods g on mg.goods_id=g.id")
    public List<GoodsVo> listGoodsVo();
    @Select("select g.*,mg.stock_count,mg.start_date,mg.end_date,mg.miaosha_price from miaosha_goods mg left join goods g on mg.goods_id=g.id where goods_id =#{goodsId}")
    public GoodsVo getGoodsVoByGoodsId(@Param("goodsId")long goodsId);
    @Update("update miaosha_goods set stock_count=stock_count-1 where goods_id=#{goodsId}")
    public int reduceStock(MiaoshaGoods g);
}

2.3.OrderService

package com.ryan.miaosha.service;

import java.util.Date;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.ryan.miaosha.dao.MiaoshaUser;
import com.ryan.miaosha.dao.OrderDao;
import com.ryan.miaosha.domain.MiaoshaOrder;
import com.ryan.miaosha.domain.OrderInfo;
import com.ryan.miaosha.vo.GoodsVo;

@Service
public class OrderService {
    @Autowired
    OrderDao orderDao;
    public MiaoshaOrder getMiaoshaOrderByUserIdGoodsId(long userId, long goodsId) {
        return orderDao.getMiaoshaOrderByUserIdGoodsId(userId,goodsId);
    }
    @Transactional
    public OrderInfo createOrder(MiaoshaUser user, GoodsVo goodsVo) {
        OrderInfo orderInfo=new OrderInfo();
        orderInfo.setCreateDate(new Date());
        orderInfo.setDeliveryAddrId(0L);
        orderInfo.setGoodsCount(1);
        orderInfo.setGoodsId(goodsVo.getId());
        orderInfo.setGoodsName(goodsVo.getGoodsName());
        orderInfo.setGoodsPrice(goodsVo.getMiaoshaPrice());
        orderInfo.setOrderChannel(1);
        orderInfo.setStatus(0);
        orderInfo.setUserId(user.getId());
        long orderId=orderDao.insert(orderInfo);
        MiaoshaOrder miaoshaOrder=new MiaoshaOrder();
        miaoshaOrder.setGoodsId(goodsVo.getId());
        miaoshaOrder.setOrderId(orderId);
        miaoshaOrder.setUserId(user.getId());
        orderDao.insertMiaoshaOrder(miaoshaOrder);
        return orderInfo;
    }
}

2.4.OrderDao

package com.ryan.miaosha.dao;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.SelectKey;

import com.ryan.miaosha.domain.MiaoshaOrder;
import com.ryan.miaosha.domain.OrderInfo;

@Mapper
public interface OrderDao {

    @Select("select* from miaosha_order where user_id=#{userId} and goods_id=#{goodsId}")
    public MiaoshaOrder getMiaoshaOrderByUserIdGoodsId(@Param("userId")long userId,@Param("goodsId") long goodsId);
    
    @Insert("insert into order_info (user_id,goods_id,goods_name,goods_count,goods_price,order_channel,status,create_date)values("
            +"#{userId},#{goodsId},#{goodsName},#{goodsCount},#{goodsPrice},#{orderChannel},#{status},#{createDate})")
    @SelectKey(keyColumn="id",keyProperty="id",resultType=long.class,before=false,statement="select last_insert_id()")
    public long insert(OrderInfo orderInfo);

    @Insert("insert into miaosha_order (user_id,goods_id,order_id) values (#{userId},#{goodsId},#{orderId})")
    public int insertMiaoshaOrder(MiaoshaOrder miaoshaOrder);
}

1.miaosha_failure.html 与 order_detail.html

<!DOCTYPE HTML>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" >
<head>
    <title>秒杀失败</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <!-- jquery -->
    <script type="text/javascript" th:src="@{/js/jquery.min.js}"></script>
    <!-- bootstrap -->
    <link rel="stylesheet" type="text/css" th:href="@{/bootstrap/css/bootstrap.min.css}" />
    <script type="text/javascript" th:src="@{/bootstrap/js/bootstrap.min.js}"></script>
    <!-- jquery-validator -->
    <script type="text/javascript" th:src="@{/jquery-validation/jquery.validate.min.js}"></script>
    <script type="text/javascript" th:src="@{/jquery-validation/localization/messages_zh.min.js}"></script>
    <!-- layer -->
    <script type="text/javascript" th:src="@{/layer/layer.js}"></script>
    <!-- md5.js -->
    <script type="text/javascript" th:src="@{/js/md5.min.js}"></script>
    <!-- common.js -->
    <script type="text/javascript" th:src="@{/js/common.js}"></script>
</head>
<body>
<div class="panel panel-success">
  <div class="panel-heading">
  </div>
   <div class="panel-body">
      <span id="name">秒杀失败： <span th:text="${errmsg}"></span></span>
     <button class="btn btn-success" type="button" id="button">倒计时</button>
  </div>
   <div class="panel-footer">
  </div>
</div>


</body>
</html>




<!DOCTYPE HTML>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" >
<head>
    <title>订单详情</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <!-- jquery -->
    <script type="text/javascript" th:src="@{/js/jquery.min.js}"></script>
    <!-- bootstrap -->
    <link rel="stylesheet" type="text/css" th:href="@{/bootstrap/css/bootstrap.min.css}" />
    <script type="text/javascript" th:src="@{/bootstrap/js/bootstrap.min.js}"></script>
    <!-- jquery-validator -->
    <script type="text/javascript" th:src="@{/jquery-validation/jquery.validate.min.js}"></script>
    <script type="text/javascript" th:src="@{/jquery-validation/localization/messages_zh.min.js}"></script>
    <!-- layer -->
    <script type="text/javascript" th:src="@{/layer/layer.js}"></script>
    <!-- md5.js -->
    <script type="text/javascript" th:src="@{/js/md5.min.js}"></script>
    <!-- common.js -->
    <script type="text/javascript" th:src="@{/js/common.js}"></script>
</head>
<body>
<div class="panel panel-success">
  <div class="panel-heading">
  </div>
   <div class="panel-body">
      <span id="name">订单ID： <span th:text="${orderInfo.id}"></span></span>
     <button class="btn btn-success" type="button" id="button">倒计时</button>
  </div>
   <div class="panel-footer">
  </div>
</div>


</body>
</html>