• 【Java Web】论坛——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

    1. 重构LikeService

    用redis事务管理，点赞时：

    • 如果已经点过赞，那么移除该用户的点赞，同时目标用户收到的赞减少;
    • 如果没点过赞，那么当前用户点赞成功，目标用户收到的赞增加。

    另外增加findUserLikeCount功能，用于查询某用户收到的赞。

    package com.nowcoder.community.service;

import com.nowcoder.community.util.RedisKeyUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.SessionCallback;
import org.springframework.stereotype.Service;

@Service
public class LikeService {
    @Autowired
    private RedisTemplate redisTemplate;

    // 点赞
    public void like(int userId, int entityType, int entityId, int entityUserId){
//        String entityLikeKey = RedisKeyUtil.getEntityLikeKey(entityType,entityId);
//        boolean isMember = redisTemplate.opsForSet().isMember(entityLikeKey,userId);
//        if(isMember){ // 已经点过赞
//            redisTemplate.opsForSet().remove(entityLikeKey,userId);
//        } else { // 没点过赞
//            redisTemplate.opsForSet().add(entityLikeKey,userId);
//        }
        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);
                operations.multi();
                if(isMember){ //移除该用户的点赞、目标用户收到的赞减少
                    operations.opsForSet().remove(entityLikeKey,userId);
                    operations.opsForValue().decrement(userLikeKey);
                } else {  //该用户的点赞成功、目标用户收到的赞增加
                    operations.opsForSet().add(entityLikeKey,userId);
                    operations.opsForValue().increment(userLikeKey);
                }
                return operations.exec();
            }
        });
    }

    // 查询某个实体点赞的数量
    public long findEntityLikeCount(int entityType, int entityId){
        String entityLikeKey = RedisKeyUtil.getEntityLikeKey(entityType,entityId);
        return redisTemplate.opsForSet().size(entityLikeKey);
    }

    // 查询某人某实体的点赞状态
    public int findEntityLikeStatus(int userId, int entityType, int entityId){
        String entityLikeKey = RedisKeyUtil.getEntityLikeKey(entityType,entityId);
         return redisTemplate.opsForSet().isMember(entityLikeKey, userId) ? 1 : 0;
    }

    // 查询某用户收到的赞数量
    public int findUserLikeCount(int userId){
        String userLikeKey = RedisKeyUtil.getUserLikeKey(userId);
        Integer count = (Integer) redisTemplate.opsForValue().get(userLikeKey);
        return count == null ? 0 : count.intValue();
    }
}


    • 1
    • 2
    • 3
    • 4
    • 5
    • 6
    • 7
    • 8
    • 9
    • 10
    • 11
    • 12
    • 13
    • 14
    • 15
    • 16
    • 17
    • 18
    • 19
    • 20
    • 21
    • 22
    • 23
    • 24
    • 25
    • 26
    • 27
    • 28
    • 29
    • 30
    • 31
    • 32
    • 33
    • 34
    • 35
    • 36
    • 37
    • 38
    • 39
    • 40
    • 41
    • 42
    • 43
    • 44
    • 45
    • 46
    • 47
    • 48
    • 49
    • 50
    • 51
    • 52
    • 53
    • 54
    • 55
    • 56
    • 57
    • 58
    • 59
    • 60
    • 61
    • 62
    • 63
    • 64

    2. 重构LikeController

    增加entityUserId参数

    package com.nowcoder.community.controller;

import com.nowcoder.community.annotation.LoginRequired;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.LikeService;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.HashMap;
import java.util.Map;

@Controller
public class LikeController {

    @Autowired
    private LikeService likeService;

    @Autowired
    private HostHolder hostHolder;

    @RequestMapping(path="/like",method = RequestMethod.POST)
    @ResponseBody
    public String like(int entityType, int entityId, int entityUserId){
        // 当前用户
        User user = hostHolder.getUser();

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

        // 返回点赞数量
        long likeCount = likeService.findEntityLikeCount(entityType, entityId);

        // 点赞状态
        int likeStatus = likeService.findEntityLikeStatus(user.getId(), entityType, entityId);

        // 封装传给页面
        Map<String,Object> map = new HashMap<>();
        map.put("likeCount",likeCount);
        map.put("likeStatus",likeStatus);
        System.out.println(likeStatus);

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


    • 1
    • 2
    • 3
    • 4
    • 5
    • 6
    • 7
    • 8
    • 9
    • 10
    • 11
    • 12
    • 13
    • 14
    • 15
    • 16
    • 17
    • 18
    • 19
    • 20
    • 21
    • 22
    • 23
    • 24
    • 25
    • 26
    • 27
    • 28
    • 29
    • 30
    • 31
    • 32
    • 33
    • 34
    • 35
    • 36
    • 37
    • 38
    • 39
    • 40
    • 41
    • 42
    • 43
    • 44
    • 45
    • 46
    • 47
    • 48
    • 49
    • 50

    3. profile.html

    <!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
	<link rel="icon" th:href="@{/img/ucas.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>果壳网-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" th:replace="index::foot">
			<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>


    • 1
    • 2
    • 3
    • 4
    • 5
    • 6
    • 7
    • 8
    • 9
    • 10
    • 11
    • 12
    • 13
    • 14
    • 15
    • 16
    • 17
    • 18
    • 19
    • 20
    • 21
    • 22
    • 23
    • 24
    • 25
    • 26
    • 27
    • 28
    • 29
    • 30
    • 31
    • 32
    • 33
    • 34
    • 35
    • 36
    • 37
    • 38
    • 39
    • 40
    • 41
    • 42
    • 43
    • 44
    • 45
    • 46
    • 47
    • 48
    • 49
    • 50
    • 51
    • 52
    • 53
    • 54
    • 55
    • 56
    • 57
    • 58
    • 59
    • 60
    • 61
    • 62
    • 63
    • 64
    • 65
    • 66
    • 67
    • 68
    • 69
    • 70
    • 71
    • 72
    • 73
    • 74
    • 75
    • 76
    • 77
    • 78
    • 79
    • 80
    • 81
    • 82
    • 83
    • 84
    • 85
    • 86
    • 87
    • 88
    • 89
    • 90
    • 91
    • 92
    • 93
    • 94
    • 95
    • 96
    • 97
    • 98
    • 99
    • 100
    • 101
    • 102
    • 103
    • 104
    • 105
    • 106
    • 107
    • 108
    • 109
    • 110
    • 111
    • 112
    • 113
    • 114
    • 115
    • 116
    • 117
    • 118
    • 119
    • 120
    • 121
    • 122
    • 123
    • 124
    • 125
    • 126
    • 127
    • 128
    • 129
    • 130
    • 131
    • 132
    • 133
    • 134
    • 135
    • 136
    • 137
    • 138
    • 139
    • 140
    • 141
    • 142
    • 143
    • 144
    • 145
    • 146
    • 147
    • 148
    • 149
    • 150
    • 151
    • 152
    • 153
    • 154
    • 155
    • 156
    • 157
    • 158
    • 159
    • 160
    • 161
    • 162
    • 163
    • 164
    • 165
    • 166
    • 167
    • 168
    • 169
  • 相关阅读:
    数字化建设方案
    最大时延扩展、CP 和相干带宽
    2023大数据挑战赛全国六强团队获奖经验+ppt分享（二）
    矩阵分析与应用+张贤达
    Day41—— 343. 整数拆分 96.不同的二叉搜索树 （动规）
    实现两栏布局的五种方式
    opengl-shader学习笔记：varying变量
    Java —— String类
    实现分布式锁SchedulerLock
    腾讯云TCP认证考试知识点有哪些？腾讯云停车票认证证书含金量高吗？
  • 原文地址：https://blog.csdn.net/qq_42251120/article/details/132740143