仿牛客网社区项目（二十三）我收到的赞

我收到的赞

重构点赞功能
- 以用户为key，记录点赞数量
- increment(key)，decrement(key)
开发个人主页
- 以用户为key，查询点赞数量

一、重构点赞功能#

增加RedisKeyUtil

public class RedisKeyUtil {
    //key的分隔符
    private static final String SPLIT = ":";
    //点赞的前缀
    private static final String PREFIX_ENTITY_LIKE = "like:entity";

    private static final String PREFIX_USER_LIKE = "like:user";
    // 某个实体的赞
    // like:entity:entityType:entityId -> set(userId)
    public static String getEntityLikeKey(int entityType, int entityId) {
        return PREFIX_ENTITY_LIKE + SPLIT + entityType + SPLIT + entityId;
    }
    // 某个用户的赞
    // like:user:userId -> int
    public static String getUserLikeKey(int userId) {
        return PREFIX_USER_LIKE + SPLIT + userId;
    }
}

为了记录点赞数量，在原先点赞的基础上增加业务逻辑所以需要重构 service层 like方法

 // 点赞
    public void like(int userId, int entityType, int entityId, int entityUserId) {
        redisTemplate.execute(new SessionCallback() {
            @Override
            public Object execute(RedisOperations operations) throws DataAccessException {
                String entityLikeKey = RedisKeyUtil.getEntityLikeKey(entityType, entityId);
                String userLikeKey = RedisKeyUtil.getUserLikeKey(entityUserId);

                boolean isMember = operations.opsForSet().isMember(entityLikeKey, userId);
				//此处需要两次更新操作，所以使用Redis编程事务
                //redis事务特殊，像是一个队列一样，查询操作只有在exec时才会执行
                operations.multi();
				
                if (isMember) {
                    operations.opsForSet().remove(entityLikeKey, userId);
                    operations.opsForValue().decrement(userLikeKey);
                } else {
                    operations.opsForSet().add(entityLikeKey, userId);
                    operations.opsForValue().increment(userLikeKey);
                }

                return operations.exec();
            }
        });
    }

再编写一个查询用户所得的赞的数量业务

      // 查询某个用户获得的赞
    public int findUserLikeCount(int userId) {
        String userLikeKey = RedisKeyUtil.getUserLikeKey(userId);
        Integer count = (Integer) redisTemplate.opsForValue().get(userLikeKey);
        return count == null ? 0 : count.intValue();
    }

之后去更新表现层Controller,因为我们的参数列表发生改变，需要实体类的用户id

public String like(int entityType, int entityId, int entityUserId) {
        User user = hostHolder.getUser();

        // 点赞
        likeService.like(user.getId(), entityType, entityId, entityUserId);

        // 数量
        long likeCount = likeService.findEntityLikeCount(entityType, entityId);
        // 状态
        int likeStatus = likeService.findEntityLikeStatus(user.getId(), entityType, entityId);
        // 返回的结果
        Map<String, Object> map = new HashMap<>();
        map.put("likeCount", likeCount);
        map.put("likeStatus", likeStatus);

        return CommunityUtil.getJSONString(0, null, map);
    }

二、开发个人主页#

这时我们就需要去修改前端界面的参数列表

discuss-detail 87行

<a href="javascript:;" th:onclick="|like(this,1,${post.id},${post.userId});|" class="text-primary">
    <b th:text="${likeStatus==1?'已赞':'赞'}">赞</b> <i th:text="${likeCount}">11</i>
</a>

138行

<a href="javascript:;" th:onclick="|like(this,2,${cvo.comment.id},${cvo.comment.userId});|" class="text-primary">
    <b th:text="${cvo.likeStatus==1?'已赞':'赞'}">赞</b>(<i th:text="${cvo.likeCount}">1</i>)
</a>

3.164行

<a href="javascript:;" th:onclick="|like(this,2,${rvo.reply.id},${rvo.reply.userId});|" class="text-primary">
    <b th:text="${rvo.likeStatus==1?'已赞':'赞'}">赞</b>(<i th:text="${rvo.likeCount}">1</i>)
</a>

由于我们传参用的时AJAX 异步方式，所以还要修改js

function like(btn, entityType, entityId, entityUserId) {
    $.post(
        CONTEXT_PATH + "/like",
        {"entityType":entityType,"entityId":entityId,"entityUserId":entityUserId},
        function(data) {
            data = $.parseJSON(data);
            if(data.code == 0) {
                $(btn).children("i").text(data.likeCount);
                $(btn).children("b").text(data.likeStatus==1?'已赞':"赞");
            } else {
                alert(data.msg);
            }
        }
    );
}

接下来就要开发个人主页功能在userController下增加主页路径

 // 个人主页
    @RequestMapping(path = "/profile/{userId}", method = RequestMethod.GET)
    public String getProfilePage(@PathVariable("userId") int userId, Model model) {
        User user = userService.findUserById(userId);
        if (user == null) {
            throw new RuntimeException("该用户不存在!");
        }

        // 用户
        model.addAttribute("user", user);
        // 点赞数量
        int likeCount = likeService.findUserLikeCount(userId);
        model.addAttribute("likeCount", likeCount);

        return "/site/profile";
    }

接下来修改前端比较简单在你认为应该跳转的地方加入地址

<a th:href="@{|/user/profile/${map.user.id}|}">

增加主页页面

<!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
	
	
	<link rel="icon" href="https://static.nowcoder.com/images/logo_87_87.png"/>
	<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" crossorigin="anonymous">
	<link rel="stylesheet" th:href="@{/css/global.css}" />
	<title>牛客网-个人主页</title>
</head>
<body>
	<div class="nk-container">
		<!-- 头部 -->
		<header class="bg-dark sticky-top" th:replace="index::header">
			<div class="container">
				<!-- 导航 -->
				<nav class="navbar navbar-expand-lg navbar-dark">
					<!-- logo -->
					<a class="navbar-brand" href="#"></a>
					<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
						<span class="navbar-toggler-icon"></span>
					</button>
					<!-- 功能 -->
					<div class="collapse navbar-collapse" id="navbarSupportedContent">
						<ul class="navbar-nav mr-auto">
							<li class="nav-item ml-3 btn-group-vertical">
								<a class="nav-link" href="../index.html">首页</a>
							</li>
							<li class="nav-item ml-3 btn-group-vertical">
								<a class="nav-link position-relative" href="letter.html">消息<span class="badge badge-danger">12</span></a>
							</li>
							<li class="nav-item ml-3 btn-group-vertical">
								<a class="nav-link" href="register.html">注册</a>
							</li>
							<li class="nav-item ml-3 btn-group-vertical">
								<a class="nav-link" href="login.html">登录</a>
							</li>
							<li class="nav-item ml-3 btn-group-vertical dropdown">
								<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
									<img src="http://images.nowcoder.com/head/1t.png" class="rounded-circle" style="width:30px;"/>
								</a>
								<div class="dropdown-menu" aria-labelledby="navbarDropdown">
									<a class="dropdown-item text-center" href="profile.html">个人主页</a>
									<a class="dropdown-item text-center" href="setting.html">账号设置</a>
									<a class="dropdown-item text-center" href="login.html">退出登录</a>
									<div class="dropdown-divider"></div>
									<span class="dropdown-item text-center text-secondary">nowcoder</span>
								</div>
							</li>
						</ul>
						<!-- 搜索 -->
						<form class="form-inline my-2 my-lg-0" action="search.html">
							<input class="form-control mr-sm-2" type="search" aria-label="Search" />
							<button class="btn btn-outline-light my-2 my-sm-0" type="submit">搜索</button>
						</form>
					</div>
				</nav>
			</div>
		</header>

		<!-- 内容 -->
		<div class="main">
			<div class="container">
				<!-- 选项 -->
				<div class="position-relative">
					<ul class="nav nav-tabs">
						<li class="nav-item">
							<a class="nav-link active" href="profile.html">个人信息</a>
						</li>
						<li class="nav-item">
							<a class="nav-link" href="my-post.html">我的帖子</a>
						</li>
						<li class="nav-item">
							<a class="nav-link" href="my-reply.html">我的回复</a>
						</li>
					</ul>
				</div>
				<!-- 个人信息 -->
				<div class="media mt-5">
					<img th:src="${user.headerUrl}" class="align-self-start mr-4 rounded-circle" alt="用户头像" style="width:50px;">
					<div class="media-body">
						<h5 class="mt-0 text-warning">
							<span th:utext="${user.username}">nowcoder</span>
							<button type="button" class="btn btn-info btn-sm float-right mr-5 follow-btn">关注TA</button>
						</h5>
						<div class="text-muted mt-3">
							<span>注册于 <i class="text-muted" th:text="${#dates.format(user.createTime,'yyyy-MM-dd HH:mm:ss')}">2015-06-12 15:20:12</i></span>
						</div>
						<div class="text-muted mt-3 mb-5">
							<span>关注了 <a class="text-primary" href="followee.html">5</a> 人</span>
							<span class="ml-4">关注者 <a class="text-primary" href="follower.html">123</a> 人</span>
							<span class="ml-4">获得了 <i class="text-danger" th:text="${likeCount}">87</i> 个赞</span>
						</div>
					</div>
				</div>
			</div>
		</div>

		<!-- 尾部 -->
		<footer class="bg-dark">
			<div class="container">
				<div class="row">
					<!-- 二维码 -->
					<div class="col-4 qrcode">
						<img src="https://uploadfiles.nowcoder.com/app/app_download.png" class="img-thumbnail" style="width:136px;" />
					</div>
					<!-- 公司信息 -->
					<div class="col-8 detail-info">
						<div class="row">
							<div class="col">
								<ul class="nav">
									<li class="nav-item">
										<a class="nav-link text-light" href="#">关于我们</a>
									</li>
									<li class="nav-item">
										<a class="nav-link text-light" href="#">加入我们</a>
									</li>
									<li class="nav-item">
										<a class="nav-link text-light" href="#">意见反馈</a>
									</li>
									<li class="nav-item">
										<a class="nav-link text-light" href="#">企业服务</a>
									</li>
									<li class="nav-item">
										<a class="nav-link text-light" href="#">联系我们</a>
									</li>
									<li class="nav-item">
										<a class="nav-link text-light" href="#">免责声明</a>
									</li>
									<li class="nav-item">
										<a class="nav-link text-light" href="#">友情链接</a>
									</li>
								</ul>
							</div>
						</div>
						<div class="row">
							<div class="col">
								<ul class="nav btn-group-vertical company-info">
									<li class="nav-item text-white-50">
										公司地址：北京市朝阳区大屯路东金泉时代3-2708北京牛客科技有限公司
									</li>
									<li class="nav-item text-white-50">
										联系方式：010-60728802(电话)&nbsp;&nbsp;&nbsp;&nbsp;admin@nowcoder.com
									</li>
									<li class="nav-item text-white-50">
										牛客科技©2018 All rights reserved
									</li>
									<li class="nav-item text-white-50">
										京ICP备14055008号-4 &nbsp;&nbsp;&nbsp;&nbsp;
										<img src="http://static.nowcoder.com/company/images/res/ghs.png" style="width:18px;" />
										京公网安备 11010502036488号
									</li>
								</ul>
							</div>
						</div>
					</div>
				</div>
			</div>
		</footer>
	</div>

	<script src="https://code.jquery.com/jquery-3.3.1.min.js" crossorigin="anonymous"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" crossorigin="anonymous"></script>
	<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" crossorigin="anonymous"></script>
	<script th:src="@{/js/global.js}"></script>
	<script th:src="@{/js/profile.js}"></script>
</body>
</html>

ok了写博客真麻烦兄弟们

posted @ 2022-04-30 19:53 卷皇阅读(407) 评论(0) 编辑收藏举报

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仿牛客网社区项目（二十三）我收到的赞

我收到的赞

一、重构点赞功能#

二、开发个人主页#

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