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
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!