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仿牛客网社区项目（二十四）关注

2022-05-03 19:32:08 作者：互联网

关注

需求
- 开发关注、取消关注功能。
- 统计用户的关注数、粉丝数。
关注
- 若A关注了B，则A是B的Follower（粉丝），B是A的Followee（目标）。
- 关注的目标可以是用户、帖子、题目等，在实现时将这些目标抽象为实体。

修改RedisKeyUtil


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_FOLLOWEE = "followee";
    private static final String PREFIX_FOLLOWER = "follower";

    // 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;
    }

    // 某个用户关注的实体
    //这里实体的可以为用户，帖子 等
    // 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;
    }
}

编写业务层逻辑 FollwService

@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();

                operations.opsForZSet().add(followeeKey, entityId, System.currentTimeMillis());
                operations.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();

                operations.opsForZSet().remove(followeeKey, entityId);
                operations.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);
    }

    // 查询实体的粉丝的数量
    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 followeeKey = RedisKeyUtil.getFolloweeKey(userId, entityType);
        return redisTemplate.opsForZSet().score(followeeKey, entityId) != null;
    }

}

编写表现层逻辑

package com.nowcoder.community.controller;

@Controller
public class FollowController {

    @Autowired
    private FollowService followService;

    @Autowired
    private HostHolder hostHolder;

    @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, "已取消关注!");
    }

}

修改UserController的个人页面请求

 @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);

        // 关注数量
        long followeeCount = followService.findFolloweeCount(userId, ENTITY_TYPE_USER);
        model.addAttribute("followeeCount", followeeCount);
        // 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";
    }

接下来去处理静态页面,关注采用的是异步的方式所以先编写对应的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");
	}
}

修改个人主页html profile.html 84行

<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 ${hasFollowed?'btn-secondary':'btn-info'} btn-sm float-right mr-5 follow-btn|"
                    th:text="${hasFollowed?'已关注':'关注TA'}" th:if="${loginUser!=null&&loginUser.id!=user.id}">关注TA</button>
        </h5>
        <div class="text-muted mt-3">
            <span>注册于 <i class="text-muted" th:text="${#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>

okl

标签：仿牛,String,int,entityType,userId,客网,二十四,entityId,public
来源： https://www.cnblogs.com/nevererror/p/16219104.html