java点赞_java实现点赞功能示例

Java实现点赞功能的示例：

1. 创建一个点赞表，包含用户ID和被点赞的ID。

CREATE TABLE `like_table` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) NOT NULL COMMENT '用户ID',
  `liked_id` int(11) NOT NULL COMMENT '被点赞的ID',
  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
  PRIMARY KEY (`id`),
  KEY `idx_user_id` (`user_id`),
  KEY `idx_liked_id` (`liked_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COMMENT='点赞表';

2. 创建点赞服务，提供点赞和取消点赞的接口。

@Service
public class LikeService {
    private final LikeMapper likeMapper;

    @Autowired
    public LikeService(LikeMapper likeMapper) {
        this.likeMapper = likeMapper;
    }

    /**
     * 点赞
     *
     * @param userId   用户ID
     * @param likedId  被点赞的ID
     */
    public void like(int userId, int likedId) {
        Like like = new Like();
        like.setUserId(userId);
        like.setLikedId(likedId);
        likeMapper.insert(like);
    }

    /**
     * 取消点赞
     *
     * @param userId   用户ID
     * @param likedId  被点赞的ID
     */
    public void unlike(int userId, int likedId) {
        LikeExample example = new LikeExample();
        example.createCriteria()
                .andUserIdEqualTo(userId)
                .andLikedIdEqualTo(likedId);
        likeMapper.deleteByExample(example);
    }
}

3. 创建点赞控制器，处理点赞和取消点赞的请求。

@RestController
@RequestMapping("/like")
public class LikeController {
    private final LikeService likeService;

    @Autowired
    public LikeController(LikeService likeService) {
        this.likeService = likeService;
    }

    /**
     * 点赞
     *
     * @param userId   用户ID
     * @param likedId  被点赞的ID
     * @return
     */
    @PostMapping("/like")
    public ResultVO like(@RequestParam("userId") int userId,
                         @RequestParam("likedId") int likedId) {
        likeService.like(userId, likedId);
        return ResultVO.success();
    }

    /**
     * 取消点赞
     *
     * @param userId   用户ID
     * @param likedId  被点赞的ID
     * @return
     */
    @PostMapping("/unlike")
    public ResultVO unlike(@RequestParam("userId") int userId,
                           @RequestParam("likedId") int likedId) {
        likeService.unlike(userId, likedId);
        return ResultVO.success();
    }
}