2018-12-17 实现秒杀功能-商品详情页

1.goods_detail.html

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>商品详情</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-default">
  <div class="panel-heading">秒杀商品详情</div>
  <div class="panel-body">
    <!-- <span th:if="${user eq null}"> 您还没有登录,请登陆后再操作<br/></span> -->
    <span th:if="${user eq null}">您还没有登录,请登录后再操作</span>
    <span>没有收货地址的提示。。。</span>
  </div>
  <table class="table" id="goodslist">
    <tr>  
        <td>商品名称</td>  
        <td colspan="3" th:text="${goods.goodsName}"></td> 
     </tr>  
     <tr>  
        <td>商品图片</td>  
        <td colspan="3"><img th:src="@{${goods.goodsImg}}" width="200" height="200" /></td>  
     </tr>
     <tr>  
        <td>秒杀开始时间</td>  
        <td th:text="${#dates.format(goods.startDate, 'yyyy-MM-dd HH:mm:ss')}"></td>
        <td id="miaoshaTip">    
            <input type="hidden" id="remainSeconds" th:value="${remainSeconds}" /> 
            <span th:if="${miaoshaStatus eq 0}">秒杀倒计时:<span id="countDown" th:text="${remainSeconds}"></span>秒</span>
            <span th:if="${miaoshaStatus eq 1}">秒杀进行中</span>
            <span th:if="${miaoshaStatus eq 2}">秒杀已结束</span>
        </td>
        <td>
            <form id="miaoshaForm" method="post" action="/miaosha/do_miaosha">
                <button class="btn btn-primary btn-block" type="submit" id="buyButton">立即秒杀</button>
                <input type="hidden" name="goodsId" th:value="${goods.id}" />
            </form>
        </td>
     </tr>
     <tr>  
        <td>商品原价</td>  
        <td colspan="3" th:text="${goods.goodsPrice}"></td>  
     </tr>
      <tr>  
        <td>秒杀价</td>  
        <td colspan="3" th:text="${goods.miaoshaPrice}"></td>  
     </tr>
     <tr>  
        <td>库存数量</td>  
        <td colspan="3" th:text="${goods.stockCount}"></td>  
     </tr>
  </table>
</div>
</body>
<script>
$(function(){
    countDown();
});
function countDown(){
    var remainSeconds=$("#remainSeconds").val();
    var timeout;
    if(remainSeconds>0){ //秒杀还没开始,倒计时
        $("#buyButton").attr("disabled",true);
        timeout = setTimeout(function(){
            $("#countDown").text(remainSeconds - 1);
            $("#remainSeconds").val(remainSeconds - 1);
            countDown();
        },1000); //1秒钟之后开始定时
    }else if (remainSeconds==0){ //秒杀进行时
        $("#buyButton").attr("disabled",false);
        if(timeout){
            clearTimeout(timeout);
        }
        $("#miaoshaTip").html("秒杀进行中");//更改当前行 <span></span>中间的字
    }else{//秒杀已经结束
        $("#buyButton").attr("disabled",true);
        $("#miaoshaTip").html("秒杀已经结束");
    }
}
/* $(function(){
    countDown();
});

function countDown(){
    var remainSeconds = $("#remainSeconds").val();
    var timeout;
    if(remainSeconds > 0){//秒杀还没开始,倒计时
        $("#buyButton").attr("disabled", true);
        timeout = setTimeout(function(){
            $("#countDown").text(remainSeconds - 1);
            $("#remainSeconds").val(remainSeconds - 1);
            countDown();
        },1000);
    }else if(remainSeconds == 0){//秒杀进行中
        $("#buyButton").attr("disabled", false);
        if(timeout){
            clearTimeout(timeout);
        }
        $("#miaoshaTip").html("秒杀进行中");
    }else{//秒杀已经结束
        $("#buyButton").attr("disabled", true);
        $("#miaoshaTip").html("秒杀已经结束");
    }
} */
</script>
</html>

1.controller层 根据跳转页面显示具体的商品详情内容

@RequestMapping("/to_detail/{goodsId}")
    String list(Model model, MiaoshaUser user,@PathVariable("goodsId") long goodsId) {          
        model.addAttribute("user", user);
        GoodsVo goods=goodsService.getGoodsVoByGoodsId(goodsId);
        model.addAttribute("goods", goods);
        long startDate = goods.getStartDate().getTime();
        long endDate = goods.getEndDate().getTime();
        long currentTimeMillis = System.currentTimeMillis();
        
        int miaoshaStatus=0;
        int remainSeconds=0;
        if(currentTimeMillis<startDate) {//秒杀还没开始 进入倒计时
            miaoshaStatus=0;
            remainSeconds=(int) ((startDate-currentTimeMillis)/1000);
        } else if(currentTimeMillis>endDate) {//秒杀已经结束
            miaoshaStatus=2;
            remainSeconds=-1;
        }else {//秒杀正在进行中
            miaoshaStatus=1;
            remainSeconds=0;
        }
        model.addAttribute("miaoshaStatus", miaoshaStatus);
        model.addAttribute("remainSeconds", remainSeconds);
        return "goods_detail";
    }

3. 增加 service层 和 dao层

//service层 
public GoodsVo getGoodsVoByGoodsId(long goodsId) {
        return goodsDao.getGoodsVoByGoodsId(goodsId);
    }
//dao层
@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);

1.goods_detail.html


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