从 0 开始实现一个博客系统 (SSM 项目)（下）

@Mapper
public interface BlogMapper {
    // 查询博客列表
    @Select("select * from blog where delete_flag = 0 order by create_time desc")
    List<BlogInfo> selectAllBlog();

    // 根据博客 ID, 查询博客信息
    @Select("select * from blog where delete_flag = 0 and id = #{blogId}")
    BlogInfo selectById(@Param("blogId") Integer blogId);

    // 根据博客 ID, 修改/删除 博客信息
    Integer updateBlog(BlogInfo blogInfo);

    // 插入博客
    @Insert("insert into blog(title, content, user_id) values(#{blogInfo.title}, #{blogInfo.content}, #{blogInfo.userId})")
    Integer insertBlog(@Param("blogInfo") BlogInfo blogInfo);
}

@Mapper
public interface UserMapper {
    // 根据用户名, 查询用户信息
    @Select("select * from user where user_name = #{userName} and delete_flag = 0")
    UserInfo selectByName(@Param("userName") String userName);

    // 根据用户 ID, 查询用户信息
    @Select("select * from user where id = #{userId} and delete_flag = 0")
    UserInfo selectById(@Param("userId") Integer userId);

}

  @Autowired
    private UserService userService;
    
    // 登录接口
    @RequestMapping("/login")
    public Result login(String userName, String password) {
        // 1.对参数进行校验
        // 2.对密码进行校验
        // 3.如果校验成功, 生成 token
        if(!StringUtils.hasLength(userName) || !StringUtils.hasLength(password)) {
//            throw new UnsupportedOperationException("用户名或密码不能为空");
            return Result.fail("用户名或密码不能为空");
        }

        // 获取用户信息
        UserInfo userInfo = userService.queryUserByName(userName);
        if(userInfo == null || userInfo.getId() <= 0) {
            return Result.fail("用户不存在");
        }
        
        // 密码校验
        if(!SecurityUtils.verify(password, userInfo.getPassword())) {
            return Result.fail("密码错误");
        }


        // 用户信息正确, 生成 token
        Map<String, Object> claim = new HashMap<>();
        claim.put(Constant.USER_CLAIM_ID, userInfo.getId());
        claim.put(Constant.USER_CLAIM_NAME, userInfo.getUserName());

        return Result.success(JWTUtils.getToken(claim));
    }

function logout() {
    localStorage.removeItem("user_token");
    location.href = "blog_login.html";
}

@Autowired
private BlogService blogService;

@RequestMapping("/getList")
public List<BlogInfo> queryBlogList() {
    return blogService.queryBlogList();
}

@Slf4j
@RestController
@RequestMapping("/blog")
public class BlogController {
    @Autowired
    private BlogService blogService;

    // 根据博客id获取博客信息
    @RequestMapping("/getBlogDetail")
    public BlogInfo getBlogDetail(Integer blogId, HttpServletRequest request) {
        BlogInfo blogInfo = blogService.getBlogDetail(blogId);
        // 获取登录用户信息
        String user_token = request.getHeader(Constant.USER_TOKEN_HEADER);
        Integer userId = JWTUtils.getUserIdFromToken(user_token);
        // 判断登录用户是否为作者
        if(userId != null && userId == blogInfo.getUserId()) {
            blogInfo.setIsLoginUser(true);
        }else {
            blogInfo.setIsLoginUser(false);
        }

        return blogInfo;
    }
}

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    // 根据博客 ID, 获取作者信息
    @RequestMapping("/getAuthorInfo")
    public UserInfo getAuthorInfo(Integer blogId) {
        // 校验博客 ID 是否正确
        if(blogId == null || blogId <= 0) {
            return null;
        }

        UserInfo userInfo = userService.queryAuthorInfoByBlogId(blogId);
        userInfo.setPassword("");
        return userInfo;
    }
}

@Slf4j
@RestController
@RequestMapping("/blog")
public class BlogController {
    @Autowired
    private BlogService blogService;

    // 添加博客
    @RequestMapping("/add")
    public Boolean publishBlog(String title, String content, HttpServletRequest request) {

        // 1.参数校验
        if(!StringUtils.hasLength(title) || !StringUtils.hasLength(content)) {
            return false;
        }

        // 2.获取当前用户
        String user_token = request.getHeader(Constant.USER_TOKEN_HEADER);
        Integer userId = JWTUtils.getUserIdFromToken(user_token);
        if(userId == null || userId <= 0) {
            return false;
        }

        // 3.博客发布
        BlogInfo blogInfo = new BlogInfo();
        blogInfo.setUserId( userId);
        blogInfo.setContent(content);
        blogInfo.setTitle(title);

        Integer result = blogService.publishBlog(blogInfo);
        return result<=0 ? false:true;
    }
}