1.数据库表

• 新增t_follow关注表

  
  
  image.png

2.entity

• Follow实体类

@Data
public class Follow {
    private Integer id;
    private Integer fromUId;
    private Integer toUId;
}

• FollowVO 视图对象类

@Data
public class FollowVO {
    private Integer toUId;
    private String nickname;
    private String avatar;
}

• mapper
• FollowMapper

public interface FollowMapper {

    @Results({
            @Result(property = "id", column = "id"),
            @Result(property = "fromUId", column = "from_uid"),
            @Result(property = "toUId", column = "to_uid")
    })
    @Select("SELECT * FROM t_follow WHERE from_uid = #{fromUId} AND to_uid = #{toUId} ")
    Follow getFollow(@Param("fromUId") int fromUId, @Param("toUId") int toUId);

    @Results({
            @Result(property = "toUId", column = "to_uid"),
            @Result(property = "nickname", column = "nickname"),
            @Result(property = "avatar", column = "avatar")
    })
    @Select("SELECT a.to_uid,b.nickname,b.avatar FROM t_follow a LEFT JOIN t_user b ON a.to_uid = b.id WHERE a.from_uid = #{fromUId}  ")
    List<FollowVO> getFollowsByUId(int fromUId);

    @Insert("INSERT INTO t_follow (from_uid,to_uid) VALUES (#{fromUId},#{toUId}) ")
    void insertFollow(Follow follow);

    @Delete("DELETE  FROM t_follow WHERE from_uid = #{fromUId} AND to_uid = #{toUId} ")
    void deleteFollow(@Param("fromUId") int fromUId, @Param("toUId") int toUId);
}
CommentMapper增加插入方法

@Insert("INSERT INTO t_comment(u_id,a_id,content,comment_time) VALUES(#{uId}, #{aId}, #{content},#{commentTime}) ")
void insert(Comment comment);

• service
• FollowService

public interface FollowService {
    Follow getFollow(int fromUId, int toUId);

    List<FollowVO> getFollowsByUId(int fromUId);

    void insertFollow(Follow follow);

    void deleteFollow(int fromUId, int toUId);
}
CommentService

public interface CommentService {
    List<CommentVO> selectCommentsByAId(int aId);
    void addComment(Comment comment);
}

• service实现类自行完成并进行单元测试

• controller

• FollowController

@RestController
@RequestMapping(value = "/api/follow")
public class FollowController {
    @Resource
    private FollowService followService;


    @PostMapping("/add")
    public ResponseResult followUser(@RequestParam("fromUId") int fromUId, @RequestParam("toUId") int toUId) {
        Follow follow = new Follow();
        follow.setFromUId(fromUId);
        follow.setToUId(toUId);
        followService.insertFollow(follow);
        return ResponseResult.success();
    }

    @PostMapping("/cancel")
    public ResponseResult cancelFollow(@RequestParam("fromUId") int fromUId, @RequestParam("toUId") int toUId) {
        followService.deleteFollow(fromUId, toUId);
        return ResponseResult.success();
    }
}

• CommentController

@RestController
@RequestMapping(value = "/api/comment")
public class CommentController {
    @Resource
    private CommentService commentService;

    @PostMapping("/add")
    public ResponseResult addComment(@RequestParam("aId") int aId, @RequestParam("uId") int uId, @RequestParam("content") String content) {
        Comment comment = new Comment();
        comment.setAId(aId);
        comment.setUId(uId);
        comment.setContent(content);
        comment.setCommentTime(new Date());
        commentService.addComment(comment);
        return ResponseResult.success();
    }
}

• 修改一下ArticleController接口中的根据id获取文章的方法，增加一个参数：登录用户的id，来判断登录用户是否已经关注了文章作者

@GetMapping(value = "/{aId}")
public ResponseResult getArticleById(@PathVariable("aId") int aId,@RequestParam("userId") int userId) {
    ArticleVO article = articleService.getArticleById(aId);
    int toUId = article.getUId();
    Map<String, Object> map = new HashMap<>();
    Follow follow = followService.getFollow(userId, toUId);
    if (follow != null) {
        map.put("followed", MsgConst.FOLLOWED);
    } else {
        map.put("followed", MsgConst.NO_FOLLOWED);
    }
    List<CommentVO> comments = commentService.selectCommentsByAId(aId);
    map.put("article", article);
    map.put("comments", comments);
    return ResponseResult.success(map);
}

3.swagger测试自行完成