37 lines
1.3 KiB
Java
37 lines
1.3 KiB
Java
package com.example.demo.service;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.data.redis.core.RedisTemplate;
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import org.springframework.stereotype.Service;
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@Service
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public class LikeService {
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private final RedisTemplate<String, Object> redisTemplate;
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@Autowired
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public LikeService(RedisTemplate<String, Object> redisTemplate) {
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this.redisTemplate = redisTemplate;
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}
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public void like(String targetId, String userId) {
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// 使用集合记录点赞用户，防止重复点赞
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redisTemplate.opsForSet().add(targetId + ":likes", userId);
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// 点赞数自增，使用字符串存储点赞数，方便后续展示
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redisTemplate.opsForValue().increment(targetId + ":likeCount", 1);
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}
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public void unlike(String targetId, String userId) {
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redisTemplate.opsForSet().remove(targetId + ":likes", userId);
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redisTemplate.opsForValue().decrement(targetId + ":likeCount", 1);
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}
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public boolean hasLiked(String targetId, String userId) {
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return redisTemplate.opsForSet().isMember(targetId + ":likes", userId);
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}
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public long getLikeCount(String targetId) {
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Long count = (Long) redisTemplate.opsForValue().get(targetId + ":likeCount");
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return count == null? 0 : count;
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}
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}
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