Java开发博客平台教程详解

@Entity
public class Blog {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String title;
    private String content;
    private LocalDateTime createTime;

    // 构造函数、getter、setter
}

public interface BlogRepository extends JpaRepository {
}

@Service
public class BlogService {
    @Autowired
    private BlogRepository blogRepository;

    public List getAllBlogs() {
        return blogRepository.findAll();
    }

    public Blog saveBlog(Blog blog) {
        blog.setCreateTime(LocalDateTime.now());
        return blogRepository.save(blog);
    }

    public Blog getBlogById(Long id) {
        return blogRepository.findById(id).orElse(null);
    }

    public void deleteBlog(Long id) {
        blogRepository.deleteById(id);
    }
}

@Controller
public class BlogController {

    @Autowired
    private BlogService blogService;

    // 显示所有文章列表
    @GetMapping("/")
    public String listBlogs(Model model) {
        model.addAttribute("blogs", blogService.getAllBlogs());
        return "index";
    }

    // 跳转到发布页面
    @GetMapping("/post")
    public String showPostForm(Model model) {
        model.addAttribute("blog", new Blog());
        return "post";
    }

    // 提交新文章
    @PostMapping("/post")
    public String postBlog(@ModelAttribute Blog blog) {
        blogService.saveBlog(blog);
        return "redirect:/";
    }

    // 查看单篇文章
    @GetMapping("/view/{id}")
    public String viewBlog(@PathVariable Long id, Model model) {
        model.addAttribute("blog", blogService.getBlogById(id));
        return "view";
    }

    // 删除文章
    @GetMapping("/delete/{id}")
    public String deleteBlog(@PathVariable Long id) {
        blogService.deleteBlog(id);
        return "redirect:/";
    }
}

spring.datasource.url=jdbc:h2:mem:blogdb
spring.datasource.driverClassName=org.h2.Driver
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.jpa.hibernate.ddl-auto=create-drop
spring.h2.console.enabled=true