Introduction

Spring Boot is a framework that helps facilitate the rapid development of Java-based applications.
This course covers the essential concepts required for backend development, as well as the basic screen layout and post view implementation of a blog application.
A blog system using Spring Boot includes topics such as RESTful API development, database integration, and security configuration.

Environment Setup

I will explain the development environment and tools required to proceed with the course.
The following tools and libraries must be installed.

• Java 11 or higher
• Spring Boot 2.5 or higher
• IDE (e.g., IntelliJ IDEA, Eclipse, VSCode)
• MySQL or H2 Database
• Maven or Gradle

Project Creation

Create a new Spring Boot project using Spring Initializr.
Add the following Spring Boot-related dependencies.

• Spring Web
• Spring Data JPA
• MySQL Driver (if using MySQL)
• Spring Security
• Thymeleaf (if used as the frontend template engine)

Blog Screen Layout Example

1. Setting Up Basic URL Path

To set the basic URL path of the blog application, write the following in the application.properties file.

        server.port=8080
        spring.datasource.url=jdbc:mysql://localhost:3306/blogdb
        spring.datasource.username=root
        spring.datasource.password=yourpassword
        spring.jpa.hibernate.ddl-auto=update
    

2. Creating Blog Post Entity

Create a simple Entity class to represent blog posts.

        import javax.persistence.*;
        import java.time.LocalDateTime;

        @Entity
        public class BlogPost {
            @Id
            @GeneratedValue(strategy = GenerationType.IDENTITY)
            private Long id;

            private String title;
            private String content;

            @Column(updatable = false)
            private LocalDateTime createdAt;

            @PrePersist
            protected void onCreate() {
                createdAt = LocalDateTime.now();
            }

            // getters and setters
        }
    

3. Creating Repository Interface

Create a Repository interface for performing CRUD operations on blog posts.

        import org.springframework.data.jpa.repository.JpaRepository;

        public interface BlogPostRepository extends JpaRepository {
        }
    

4. Implementing Service Class

Write a service class to implement business logic.

        import org.springframework.beans.factory.annotation.Autowired;
        import org.springframework.stereotype.Service;

        import java.util.List;

        @Service
        public class BlogPostService {
            @Autowired
            private BlogPostRepository repository;

            public List findAll() {
                return repository.findAll();
            }

            public BlogPost findById(Long id) {
                return repository.findById(id).orElse(null);
            }

            public void save(BlogPost blogPost) {
                repository.save(blogPost);
            }

            public void deleteById(Long id) {
                repository.deleteById(id);
            }
        }
    

5. Implementing Controller

Implement a Controller class to handle client requests.
The following is an example that outputs the list of blog posts.

        import org.springframework.beans.factory.annotation.Autowired;
        import org.springframework.stereotype.Controller;
        import org.springframework.ui.Model;
        import org.springframework.web.bind.annotation.GetMapping;

        @Controller
        public class BlogPostController {
            @Autowired
            private BlogPostService blogPostService;

            @GetMapping("/posts")
            public String getAllPosts(Model model) {
                model.addAttribute("posts", blogPostService.findAll());
                return "posts"; // Thymeleaf template file
            }
        }
    

Implementing Blog Post View

In this section, we will implement the blog post view.
We will write a Thymeleaf template to display the list of posts based on the Controller and Service prepared in the previous section.

1. Thymeleaf Setup

Add Thymeleaf settings to the application.properties file.

        spring.thymeleaf.prefix=classpath:/templates/
        spring.thymeleaf.suffix=.html
    

2. Creating Blog Post List Template

Create the src/main/resources/templates/posts.html file and enter the following code.

        

        
        
            
        
        
            
Blog Post List
            

                

                

                

                

            
        
        
    

Conclusion

Through this course, we explored the methods for backend development of a basic blog application using Spring Boot.
Additionally, I recommend implementing more complex features, including authentication, authorization management, and writing test cases.

I will continue the series later to include more content. Thank you!