• 【Java Web】开发关注、取关功能

    • 需求
      • 开发关注、取消关注功能；
      • 统计用户的关注数、粉丝数；
    • 关键
      • 若A关注了B，则A是B的粉丝follower，B是A的关注目标followee ;
      • 关注的目标可以是用户、帖子、题目等，在实现时这些目标抽象为实体。

    1. RedisKeyUtil

    用于生成相关的key

    package com.nowcoder.community.util;

public class RedisKeyUtil {
    private static final String SPLIT = ":";
    private static final String PREFIX_ENTITY_LIKE = "like:entity";
    private static final String PREFIX_USER_LIKE = "like:user";
    private static final String PREFIX_FOLLOWER = "follower";
    private static final String PREFIX_FOLLOWEE = "followee";

    // 某个实体的赞对应的key
    // 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;
    }

    // 某个用户关注的实体
    //followee:userId:entityType -> zset(entityId,now)
    public static String getFolloweeKey(int userId, int entityType){
        return PREFIX_FOLLOWEE + SPLIT + userId + SPLIT + entityType;
    }

    // 某个实体拥有的粉丝
    // follower:entityType:entityId -> zset(userId,now)
    public static String getFollowerKey(int entityType, int entityId){
        return PREFIX_FOLLOWER + SPLIT + entityType + SPLIT + entityId;
    }

}


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    2. FollowService

    package com.nowcoder.community.service;

import com.nowcoder.community.entity.User;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.HostHolder;
import com.nowcoder.community.util.RedisKeyUtil;
import org.apache.coyote.http2.HpackDecoder;
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;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.Date;

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

    public void follow(int userId, int entityType, int entityId){
        redisTemplate.execute(new SessionCallback() {
            @Override
            public Object execute(RedisOperations operations) throws DataAccessException {
                String followeeKey = RedisKeyUtil.getFolloweeKey(userId,entityType);
                String followerKey = RedisKeyUtil.getFollowerKey(entityType,entityId);

                operations.multi();
                redisTemplate.opsForZSet().add(followeeKey,entityId,System.currentTimeMillis());
                redisTemplate.opsForZSet().add(followerKey,userId,System.currentTimeMillis());
                return operations.exec();
            }
        });
    }

    public void unfollow(int userId, int entityType, int entityId){
        redisTemplate.execute(new SessionCallback() {
            @Override
            public Object execute(RedisOperations operations) throws DataAccessException {
                String followeeKey = RedisKeyUtil.getFolloweeKey(userId,entityType);
                String followerKey = RedisKeyUtil.getFollowerKey(entityType,entityId);

                operations.multi();
                redisTemplate.opsForZSet().remove(followeeKey,entityId);
                redisTemplate.opsForZSet().remove(followerKey,userId);
                return operations.exec();
            }
        });
    }

    // 查询关注的实体的数量
    public long findFolloweeCount(int userId, int entityType){
        String followeeKey = RedisKeyUtil.getFolloweeKey(userId,entityType);
        return redisTemplate.opsForZSet().zCard(followeeKey);
    }

    // 统计某一实体的粉丝数量
    public long findFollowerCount(int entityType, int entityId){
        String followerKey = RedisKeyUtil.getFollowerKey(entityType,entityId);
        return redisTemplate.opsForZSet().zCard(followerKey);
    }

    // 查询当前用户是否已关注该实体
    public boolean hasFollowed(int userId, int entityType, int entityId){
        String followedKey = RedisKeyUtil.getFolloweeKey(userId, entityType);
        return redisTemplate.opsForZSet().score(followedKey,entityId) != null;
    }
}


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    3. FollowController

    package com.nowcoder.community.controller;

import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.FollowService;
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;

@Controller
public class FollowController {

    @Autowired
    private HostHolder hostHolder;

    @Autowired
    private FollowService followService;

    @RequestMapping(path = "/follow", method = RequestMethod.POST)
    @ResponseBody
    public String follow(int entityType, int entityId){
        User user = hostHolder.getUser();
        followService.follow(user.getId(), entityType, entityId);

        return CommunityUtil.getJSONString(0,"已关注！");
    }

    @RequestMapping(path = "/unfollow",method = RequestMethod.POST)
    @ResponseBody
    public String unfollow(int entityType, int entityId){
        User user = hostHolder.getUser();
        followService.unfollow(user.getId(), entityType, entityId);

        return CommunityUtil.getJSONString(0,"已取关！");
    }
}


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    4. UserController 新增 getProfilePage方法

    package com.nowcoder.community.controller;

import com.nowcoder.community.annotation.LoginRequired;
import com.nowcoder.community.dao.UserMapper;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.FollowService;
import com.nowcoder.community.service.LikeService;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.HostHolder;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;

@Controller
@RequestMapping(path = "/user")
public class UserController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(UserController.class);

    @Value("${community.path.upload}")
    private String uploadPath;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private UserService userService;

    @Autowired
    private HostHolder hostHolder;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private LikeService likeService;

    @Autowired
    private FollowService followService;

    @LoginRequired
    @RequestMapping(path = "/setting",method = RequestMethod.GET)
    public String getSettingPage(){
        return "/site/setting";
    }

    @LoginRequired
    @RequestMapping(path="/upload", method = RequestMethod.POST)
    public String uploadHeader(MultipartFile headerImage, Model model){
        if(headerImage == null){
            model.addAttribute("headerMsg","您还没有选择图片！");
        }
        // 获取原始文件名及其后缀
        String fileName = headerImage.getOriginalFilename();  // 原始文件名
        String suffix = fileName.substring(fileName.lastIndexOf(".")); //从最后一个点往后截取
        if(StringUtils.isBlank(suffix)){
            model.addAttribute("headerMsg","文件格式不正确");
        }
        // 为了避免同名覆盖，需要给每个头像生成不同的名字
        fileName = CommunityUtil.generateUUID() + suffix;
        // 确定文件存放路径
        File dest = new File(uploadPath + "/" + fileName);
        try {
            // 存储文件
            headerImage.transferTo(dest); // 将当前文件内容写进目标文件
        } catch (IOException e) {
            logger.error("上传文件失败"+e.getMessage());
            throw new RuntimeException("上传文件失败，服务器发生异常！", e);
        }
        // 更新当前用户头像路径(web访问路径)
        // http://localhost:8080/communtiy/user/header/xxx.png
        User user = hostHolder.getUser();
        String headerUrl = domain + contextPath + "/user/header/" + fileName;
        userService.updateHeader(user.getId(), headerUrl);

        // 头像更新成功，返回首页
        return "redirect:/index";
    }

    @RequestMapping(path = "/header/{filename}", method = RequestMethod.GET)
    public void getHeader(@PathVariable("filename") String fileName, HttpServletResponse response){
        // 服务器存放路径
        fileName = uploadPath + "/" + fileName;
        // 文件后缀
        String suffix = fileName.substring(fileName.lastIndexOf(".")+1);
        // 响应图片
        response.setContentType("image/"+suffix);
        try (
                OutputStream os = response.getOutputStream();  // 输出流
                FileInputStream fis = new FileInputStream(fileName);  // 输入流，读图片后才能输出
        ){
            byte[] buffer = new byte[1024];
            int b = 0;
            while((b = fis.read(buffer)) != -1){
                os.write(buffer,0, b);
            }
        } catch (IOException e) {
            logger.error("读取头像失败:"+e.getMessage());
            throw new RuntimeException(e);
        }
    }

    @LoginRequired
    @RequestMapping(path = "/modifyPassword", method = RequestMethod.POST)
    public String modifyPassword(String originalPassword, String newPassword1, String newPassword2, Model model){
        if(StringUtils.isBlank(originalPassword)){
            model.addAttribute("originPasswordMsg","密码不能为空！");
            System.out.println("密码不能为空！");
            return "/site/setting";
        }
        if(StringUtils.isBlank(newPassword1)){
            model.addAttribute("newPasswordMsg1","密码不能为空！");
            return "/site/setting";
        }
        if(StringUtils.isBlank(newPassword2)){
            model.addAttribute("newPasswordMsg2","密码不能为空！");
            return "/site/setting";
        }

        User user = hostHolder.getUser();
        if(!user.getPassword().equals(CommunityUtil.md5(originalPassword+user.getSalt()))){  // 原密码不正确
            model.addAttribute("originPasswordMsg","密码不正确！");
            System.out.println("密码不正确！");
            return "/site/setting";
        }
        if(!newPassword1.equals(newPassword2)){  // 新密码两次输入不一致
            model.addAttribute("newPasswordMsg2","两次密码不一致！");
            return "/site/setting";
        }
        try {  // 修改数据库中密码
            userMapper.updatePassword(user.getId(), CommunityUtil.md5(newPassword1+user.getSalt()));
            return "redirect:/index";
        } catch (Exception e) {
            logger.error("修改密码失败："+e.getMessage());
            throw new RuntimeException(e);
        }
    }

    @RequestMapping(path = "/profile/{userId}", method = RequestMethod.GET)
    public String getProfilePage(@PathVariable("userId") int userId, Model model){
        User user = userService.findUserById(userId);
        if(user == null){  // 防止恶意攻击
            throw new RuntimeException("该用户不存在");
        }
        // 查询的目标用户
        model.addAttribute("user",user);

        // 查询收到点赞数量
        int likeCount = likeService.findUserLikeCount(user.getId());
        model.addAttribute("likeCount",likeCount);

        // 查询用户关注了多少用户
        long followeeCount = followService.findFolloweeCount(userId, ENTITY_TYPE_USER);
        model.addAttribute("followeeCount",followeeCount);

        // 查询粉丝数量
        long followerCount = followService.findFollowerCount(ENTITY_TYPE_USER, userId);
        model.addAttribute("followerCount",followerCount);

        // 是否已关注
        boolean hasFollowed = false;
        if(hostHolder.getUser() != null)
            hasFollowed = followService.hasFollowed(hostHolder.getUser().getId(), ENTITY_TYPE_USER, userId);
        model.addAttribute("hasFollowed",hasFollowed);

        return "/site/profile";
    }
}


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    5. 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>
							<input type="hidden" id="entityId" th:value="${user.id}">
							<button type="button" th:class="|btn ${hasFollowed ? 'btn-secondary':'btn-info'} btn-sm float-right mr-5 follow-btn|"
									th:if="${loginUser !=null && loginUser.id != user.id}"
									th:text="${hasFollowed?'已关注':'关注TA'}">关注TA
							</button>
						</h5>
						<div class="text-muted mt-3">
							<span >注册于 <i class="text-muted" th:text="${#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" th:text="${followeeCount}">5</a> 人</span>
							<span class="ml-4">关注者 <a class="text-primary" href="follower.html" th:text="${followerCount}">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>
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	<script th:src="@{/js/global.js}"></script>
	<script th:src="@{/js/profile.js}"></script>
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    6. profile.js

    $(function(){
	$(".follow-btn").click(follow);
});

function follow() {
	var btn = this;
	if($(btn).hasClass("btn-info")) {
		// 关注TA
		$.post(
			CONTEXT_PATH + "/follow",
			{"entityType":3, "entityId":$(btn).prev().val()},
			function (data) {
				data = $.parseJSON(data);
				if(data.code == 0){
					window.location.reload();
				} else {
					alert(data.msg);
				}
			}
		);
		// $(btn).text("已关注").removeClass("btn-info").addClass("btn-secondary");
	} else {
		// 取消关注
		$.post(
			CONTEXT_PATH + "/unfollow",
			{"entityType":3, "entityId":$(btn).prev().val()},
			function (data) {
				data = $.parseJSON(data);
				if(data.code == 0){
					window.location.reload();
				} else {
					alert(data.msg);
				}
			}
		);
		// $(btn).text("关注TA").removeClass("btn-secondary").addClass("btn-info");
	}
}

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  • 原文地址：https://blog.csdn.net/qq_42251120/article/details/132741330