京东秒杀之秒杀详情

1 编写前端页面（商品详情）

<!DOCTYPE html>
<head>
    <title>商品详情</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <script type="text/javascript" src="/js/jquery.min.js"></script>
    <link rel="stylesheet" type="text/css" href="/bootstrap/css/bootstrap.min.css" /><!-- bootstrap -->
    <script type="text/javascript" src="/bootstrap/js/bootstrap.min.js"></script>
    <script type="text/javascript" src="/jquery-validation/jquery.validate.min.js"></script> <!-- jquery-validator -->
    <script type="text/javascript" src="/jquery-validation/localization/messages_zh.min.js"></script>
    <script type="text/javascript" src="/layer/layer.js"></script><!-- layer -->
    <script type="text/javascript" src="/js/md5.min.js"></script><!-- md5.js -->
    <script type="text/javascript" src="/js/common.js"></script><!-- common.js -->
    <script type="text/javascript" src="/js/socket.js"></script><!-- common.js -->
</head>
<body>
<div class="panel panel-default">
    <div class="panel-heading">秒杀商品详情</div>
    <div class="panel-body">
    <div id="userTip" style="display: none">
        <span> 您还没有登录，请<a href="/login.html">登陆</a>后再操作<br/></span>
    </div>
    <span>没有收货地址的提示。。。</span>
</div>
<table class="table">
    <tr>
        <td>商品名称</td>
        <td colspan="3" id="goodName"></td>
    </tr>
    <tr>
        <td>商品图片</td>
        <td colspan="3"><img id="goodImg"  width="200" height="200" /></td>
    </tr>
    <tr>
        <td>秒杀开始时间</td>
        <td id="startDate"></td>
        <td id="seckillTip">
        </td>
        <td>
            <img id="verifyCodeImg" width="80" height="32"  onclick="initVerifyCodeImg()" style="display: none">
            <input id="verifyCode" style="display: none">
            <button class="btn btn-primary btn-block" type="button" id="buyButton" onclick="">立即秒杀</button>
        </td>
    </tr>
    <tr>
        <td>商品原价</td>
        <td colspan="3" id="goodPrice"></td>
    </tr>
    <tr>
        <td>秒杀价</td>
        <td colspan="3" id="seckillPrice"></td>
    </tr>
    <tr>
        <td>库存数量</td>
        <td colspan="3" id="stockCount"></td>
    </tr>
</table>
</div>
<script type="text/javascript">


    var seckillId;

    $(function () {
          seckillId = getQueryString("seckillId");
        initGood();
    });


    function initGood(){
        $(function () {
            $.ajax({
                url: "http://localhost:9000/seckill/seckillGood/find?seckillId="+seckillId,
                type: "get",
                xhrFields: {withCredentials: true}, //启用cookie
                success:function (data) {
                    if(data.code==200){
                        //填充表格中的数据
                        renderGood(data.data);
                    }else{
                        layer.msg(data.msg)
                    }
                }
            });
        });

    }

    function renderGood(good) {
         $("#goodName").html(good.goodName);
         $("#goodImg").prop("src",good.goodImg);
         $("#startDate").html(good.startDate);
         $("#goodPrice").html(good.goodPrice);
         $("#stockCount").html(good.stockCount);
        $("#seckillPrice").html(good.seckillPrice);
        //调用时间
        renderDate(good.startDate,good.endDate);
    }

    //定义秒杀的三个阶段
    var timer;  //计时器
    //距离抢购开始还有多久
    var remainStartSeconds;
    //距离结束还有多久
    var remainEndSeconds;

    function renderDate(sDate,eDate) {
        var startTime = new Date(sDate);  // 2023-11-25 16:00
        var endTime = new Date(eDate);   // 2023-11-25 18:00
        var now = new Date();        // 2023-11-25 14:37
        remainStartSeconds=parseInt((startTime.getTime()-now.getTime())/1000);//秒
        remainEndSeconds=parseInt((endTime.getTime()-now.getTime())/1000);//秒
        timer=window.setInterval(showSeckillTip,1000);
    }

    
    function showSeckillTip() {
        remainStartSeconds--;
        remainEndSeconds--;

       if(remainStartSeconds>0){
           $("#seckillTip").html("距离本场秒杀开始还有"+remainStartSeconds+"秒");
           //禁用按钮
           $("#buyButton").prop("disabled",true);
       }else{
           if(remainEndSeconds>0){
                 //秒杀中
               $("#seckillTip").html("秒杀进行中....");
               //禁用按钮
               $("#buyButton").prop("disabled",false);
           }else{
               $("#seckillTip").html("秒杀结束了");
               //禁用按钮
               $("#buyButton").prop("disabled",true);
               window.clearInterval(timer);//取消计时器
           }


       }
    }

</script>
</body>
</html>

2 编写Mapper接口

@Mapper
public interface SeckillGoodMapper {

    @Select("SELECT * FROM t_seckill_goods")
    public List<SeckillGood> query();

    @Select("SELECT * FROM t_seckill_goods where id=#{seckillId}")
    public SeckillGoodVo find(Long seckillId);
}

3 编写service业务逻辑接口及其实现类

service业务逻辑接口

public interface SeckillGoodService {

    /**
     * 查询商品数据
     * @return
     */
    public List<SeckillGoodVo> query();

    /**
     * 查询商品详情
     * @param seckillId
     * @return
     */
    public SeckillGoodVo find(Long seckillId);
}

实现类

    @Override
    public SeckillGoodVo find(Long seckillId) {
        if (seckillId == null){
            return null;
        }
        //根据场次id查询商品
        SeckillGood sg=  seckillGoodMapper.find(seckillId);

        if(sg==null){
            return null;
        }

        List<SeckillGood> seckillGoodList = new ArrayList<>();
        seckillGoodList.add(sg);
        //调用聚合的方法
        List<SeckillGoodVo> seckillGoodVos = getSeckillGoodVos(seckillGoodList);
        //获取单个对象
        return seckillGoodVos.get(0);
    }

4 创建controller层

    @RequestMapping("/find")
    public Result find(Long seckillId){
        SeckillGoodVo seckillGoodVo = seckillGoodService.find(seckillId);

        return Result.success(seckillGoodVo);
    }