在Java中如何开发博客文章编辑功能_博客编辑模块实践指南

@Entity
@Table(name = "blog_posts")
public class BlogPost {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false, length = 200)
    private String title;

    @Lob
    @Column(nullable = false)
    private String content;

    @Column(name = "author", nullable = false)
    private String author;

    @Column(name = "created_at")
    @CreationTimestamp
    private LocalDateTime createdAt;

    @Column(name = "updated_at")
    @UpdateTimestamp
    private LocalDateTime updatedAt;

    // Getters and Setters
}

public interface BlogPostRepository extends JpaRepository<BlogPost, Long> {
    List<BlogPost> findByAuthor(String author);
    List<BlogPost> findByTitleContaining(String keyword);
}

@Service
public class BlogPostService {

    @Autowired
    private BlogPostRepository blogPostRepository;

    public BlogPost savePost(BlogPost post) {
        if (post.getTitle() == null || post.getTitle().trim().isEmpty()) {
            throw new IllegalArgumentException("标题不能为空");
        }
        if (post.getContent() == null || post.getContent().length() < 10) {
            throw new IllegalArgumentException("内容至少10个字符");
        }
        return blogPostRepository.save(post);
    }

    public BlogPost updatePost(Long id, BlogPost updatedPost, String username) {
        BlogPost existing = blogPostRepository.findById(id)
                .orElseThrow(() -> new RuntimeException("文章未找到"));

        if (!existing.getAuthor().equals(username)) {
            throw new SecurityException("无权修改他人文章");
        }

        existing.setTitle(updatedPost.getTitle());
        existing.setContent(updatedPost.getContent());
        return blogPostRepository.save(existing);
    }
}

@RestController
@RequestMapping("/api/posts")
public class BlogPostController {

    @Autowired
    private BlogPostService blogPostService;

    @PostMapping
    public ResponseEntity<BlogPost> create(@RequestBody BlogPost post) {
        BlogPost saved = blogPostService.savePost(post);
        return ResponseEntity.ok(saved);
    }

    @PutMapping("/{id}")
    public ResponseEntity<BlogPost> update(
            @PathVariable Long id,
            @RequestBody BlogPost post,
            HttpServletRequest request) {
        String author = getUserNameFromSession(request); // 简化示例
        BlogPost updated = blogPostService.updatePost(id, post, author);
        return ResponseEntity.ok(updated);
    }

    @GetMapping("/{id}")
    public ResponseEntity<BlogPost> getById(@PathVariable Long id) {
        BlogPost post = blogPostRepository.findById(id)
                .orElseThrow(() -> new RuntimeException("文章不存在"));
        return ResponseEntity.ok(post);
    }

    private String getUserNameFromSession(HttpServletRequest request) {
        // 实际项目中从SecurityContext或Token解析用户
        return "testuser";
    }
}