springboot编写博客系统的点赞功能

实现博客点赞功能的基本思路如下：

1. 定义点赞实体类

@Entity
public class Like {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private Long userId;

    private Long blogId;

    // getter, setter and constructor
}

2. 创建点赞表

CREATE TABLE `like` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `user_id` bigint(20) NOT NULL,
  `blog_id` bigint(20) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

3. 创建点赞服务类

@Service
public class LikeService {
    @Autowired
    private LikeRepository likeRepository;

    public void like(Long userId, Long blogId) {
        Like like = new Like(userId, blogId);
        likeRepository.save(like);
    }

    public void cancelLike(Long userId, Long blogId) {
        likeRepository.deleteByUserIdAndBlogId(userId, blogId);
    }
}

4. 创建点赞控制器

@RestController
public class LikeController {
    @Autowired
    private LikeService likeService;

    @PostMapping("/like")
    public void like(@RequestParam Long userId, @RequestParam Long blogId) {
        likeService.like(userId, blogId);
    }

    @PostMapping("/cancel-like")
    public void cancelLike(@RequestParam Long userId, @RequestParam Long blogId) {
        likeService.cancelLike(userId, blogId);
    }
}

5. 在博客详情页面中添加点赞按钮

<button onclick="like()">点赞</button>
<button onclick="cancelLike()">取消点赞</button>

<script>
function like() {
    $.post("/like?userId=${userId}&blogId=${blogId}", function() {
        alert("点赞成功！");
    });
}

function cancelLike() {
    $.post("/cancel-like?userId=${userId}&blogId=${blogId}", function() {
        alert("取消点赞成功！");
    });
}
</script>

以上就是实现博客点赞功能的基本步骤，具体实现还需要结合具体的业务需求进行调整。