\n4. Create Entity Class<\/h2>\n
Create entity classes to define the data models needed for the application. To store basic blog posts, the Post entity class is created as follows:<\/p>\n
package com.example.blog.model;\n\nimport javax.persistence.*;\n\n@Entity\npublic class Post {\n @Id\n @GeneratedValue(strategy = GenerationType.IDENTITY)\n private Long id;\n\n @Column(nullable = false)\n private String title;\n\n @Column(nullable = false)\n private String content;\n\n private String author;\n\n \/\/ getters and setters\n}<\/code><\/pre>\nThis class contains the ID, title, content, and author of the post. It handles the mapping to the database using JPA.<\/p>\n<\/section>\n\n5. Create Repository Interface<\/h2>\n
Create a repository interface that extends JpaRepository to handle CRUD operations for the Post entity:<\/p>\n
package com.example.blog.repository;\n\nimport com.example.blog.model.Post;\nimport org.springframework.data.jpa.repository.JpaRepository;\n\npublic interface PostRepository extends JpaRepository {\n}<\/code><\/pre>\nThis interface allows easy access to CRUD operations associated with the Post entity in the database.<\/p>\n<\/section>\n\n6. Write Service Class<\/h2>\n
Create a service class that handles business logic and defines business rules. The PostService class is written as follows:<\/p>\n
package com.example.blog.service;\n\nimport com.example.blog.model.Post;\nimport com.example.blog.repository.PostRepository;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Service;\n\nimport java.util.List;\n\n@Service\npublic class PostService {\n private final PostRepository postRepository;\n\n @Autowired\n public PostService(PostRepository postRepository) {\n this.postRepository = postRepository;\n }\n\n public List findAll() {\n return postRepository.findAll();\n }\n\n public Post save(Post post) {\n return postRepository.save(post);\n }\n\n public Post findById(Long id) {\n return postRepository.findById(id).orElse(null);\n }\n\n public void deleteById(Long id) {\n postRepository.deleteById(id);\n }\n}<\/code><\/pre>\nThis class defines methods to retrieve the list of posts, save posts, and delete posts.<\/p>\n<\/section>\n\n7. Write Controller<\/h2>\n
Now, let’s write the controller class to handle client requests. The PostController class can be written as follows:<\/p>\n
package com.example.blog.controller;\n\nimport com.example.blog.model.Post;\nimport com.example.blog.service.PostService;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Controller;\nimport org.springframework.ui.Model;\nimport org.springframework.web.bind.annotation.*;\n\nimport java.util.List;\n\n@Controller\n@RequestMapping(\"\/posts\")\npublic class PostController {\n private final PostService postService;\n\n @Autowired\n public PostController(PostService postService) {\n this.postService = postService;\n }\n\n @GetMapping\n public String list(Model model) {\n List posts = postService.findAll();\n model.addAttribute(\"posts\", posts);\n return \"post\/list\";\n }\n\n @GetMapping(\"\/new\")\n public String createForm(Model model) {\n model.addAttribute(\"post\", new Post());\n return \"post\/form\";\n }\n\n @PostMapping\n public String create(Post post) {\n postService.save(post);\n return \"redirect:\/posts\";\n }\n \n @GetMapping(\"\/{id}\")\n public String view(@PathVariable Long id, Model model) {\n Post post = postService.findById(id);\n model.addAttribute(\"post\", post);\n return \"post\/view\";\n }\n\n @GetMapping(\"\/edit\/{id}\")\n public String editForm(@PathVariable Long id, Model model) {\n Post post = postService.findById(id);\n model.addAttribute(\"post\", post);\n return \"post\/form\";\n }\n\n @PostMapping(\"\/edit\/{id}\")\n public String edit(@PathVariable Long id, Post post) {\n post.setId(id);\n postService.save(post);\n return \"redirect:\/posts\";\n }\n\n @GetMapping(\"\/delete\/{id}\")\n public String delete(@PathVariable Long id) {\n postService.deleteById(id);\n return \"redirect:\/posts\";\n }\n}<\/code><\/pre>\nThe controller defines handler methods for HTTP requests following the pattern. The above code implements listing, creating, editing, and deleting posts functionalities.<\/p>\n<\/section>\n\n8. Write Thymeleaf Template<\/h2>\n
Now it’s time to create the HTML view using Thymeleaf. The list.html to display the list of posts can be written as follows:<\/p>\n
<!DOCTYPE html>\n<html xmlns:th=\"http:\/\/www.thymeleaf.org\">\n<head>\n <title>Post List<\/title>\n<\/head>\n<body>\n <h1>Post List<\/h1>\n <a href=\"@{\/posts\/new}\">Create New Post<\/a>\n <ul>\n <li th:each=\"post : ${posts}\">\n <a th:href=\"@{\/posts\/{id}(id=${post.id})}\">[[${post.title}]]<\/a>\n <\/li>\n <\/ul>\n<\/body>\n<\/html><\/code><\/pre>\nThe above template displays the list of posts, where clicking on each post title will take you to the details page of that post.<\/p>\n<\/section>\n\n9. Conclusion<\/h2>\n
This course introduced how to build a simple blog application using Spring Boot and Thymeleaf. I hope it helped you understand basic backend development by creating entity, repository, service, controller, and view step by step.<\/p>\n
If you want to add more features, consider implementing comment functionality for posts, user authentication, and permission management. This will help you build a solid foundation for more advanced web application development.<\/p>\n<\/section>\n<\/article>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
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