效果：?

思路：很好想，把自己的粉絲和自己關(guān)注的人都存起來（set即可），做增刪改查。

package com.now.community.community.service;import com.now.community.community.entity.User; import com.now.community.community.util.CommunityConstant; import com.now.community.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;import java.util.*;@Service public class FollowService implements CommunityConstant {@Autowiredprivate RedisTemplate redisTemplate;@Autowiredprivate UserService userService;public void follow(int userId, int entityType, int entityId) {redisTemplate.execute(new SessionCallback() {@Overridepublic 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() {@Overridepublic 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();}});}// 查詢關(guān)注的實體的數(shù)量public long findFolloweeCount(int userId, int entityType) {String followeeKey = RedisKeyUtil.getFolloweeKey(userId, entityType);return redisTemplate.opsForZSet().zCard(followeeKey);}// 查詢實體的粉絲的數(shù)量public long findFollowerCount(int entityType, int entityId) {String followerKey = RedisKeyUtil.getFollowerKey(entityType, entityId);return redisTemplate.opsForZSet().zCard(followerKey);}// 查詢當(dāng)前用戶是否已關(guān)注該實體public boolean hasFollowed(int userId, int entityType, int entityId) {String followeeKey = RedisKeyUtil.getFolloweeKey(userId, entityType);return redisTemplate.opsForZSet().score(followeeKey, entityId) != null;}// 查詢某用戶關(guān)注的人public List<Map<String, Object>> findFollowees(int userId, int offset, int limit) {String followeeKey = RedisKeyUtil.getFolloweeKey(userId, ENTITY_TYPE_USER);Set<Integer> targetIds = redisTemplate.opsForZSet().reverseRange(followeeKey, offset, offset + limit - 1);if (targetIds == null) {return null;}List<Map<String, Object>> list = new ArrayList<>();for (Integer targetId : targetIds) {Map<String, Object> map = new HashMap<>();User user = userService.findUserById(targetId);map.put("user", user);Double score = redisTemplate.opsForZSet().score(followeeKey, targetId);map.put("followTime", new Date(score.longValue()));list.add(map);}return list;}// 查詢某用戶的粉絲public List<Map<String, Object>> findFollowers(int userId, int offset, int limit) {String followerKey = RedisKeyUtil.getFollowerKey(ENTITY_TYPE_USER, userId);Set<Integer> targetIds = redisTemplate.opsForZSet().reverseRange(followerKey, offset, offset + limit - 1);if (targetIds == null) {return null;}List<Map<String, Object>> list = new ArrayList<>();for (Integer targetId : targetIds) {Map<String, Object> map = new HashMap<>();User user = userService.findUserById(targetId);map.put("user", user);Double score = redisTemplate.opsForZSet().score(followerKey, targetId);map.put("followTime", new Date(score.longValue()));list.add(map);}return list;} }

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