JavaとSpring BootでAPIを構築してみた【REST APIs】

1.APIの概要

Create

PUT /books/

Read

GET /books/
GET /books

Update

PUT /books/

Delete

DELET /books/

2.spring.initializr でプロジェクトを作成する

(1) ブラウザを開き、(https://start.spring.io/) を入力し、開く
(2) 下記を入力し、Dependenciesで下記を選択し、『GENERATE』ボタンを押す

Project: Maven
Language: Java
SpringBoot: 3.4.4

Group: com.devtiro.books
Artifact: books
Name : books
Description: REST API for Books
Package name:com.devtiro.books

Packaging: Jar
Java: 17

Dependencies

Spring Web
Lombok
Spring Data JPA
H2 Database

3.Domain Modelling

(1)domain/BookEntitiy.javaを作成する

main/java/com/devtiro/books/domain/BookEntitiy.java

package com.devtiro.books.domain;

import jakarta.persistence.Entity;
import jakarta.persistence.Table;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
@Entity
@Table(name = "books")
public class BookEntity {

    @Id
    private String isbn;
    private String author;
    private String title;
}

(2)repositories/BookRepository.javaを作成する

main/java/com/devtiro/books/repositories/BookRepository.java

package com.devtiro.books.repositories;

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

import com.devtiro.books.domain.BookEntity;

@Repository
public interface BookRepository extends JpaRepository<BookEntity, String> {
}

(3)services/BookServices.javaを作成する

main/java/com/devtiro/books/services/BookServices.java

package com.devtiro.books.services;

public interface BookServices {

}

(4)services/BookServicesImpl.javaを作成する

main/java/com/devtiro/books/impl/BookServiceImpl.java

package com.devtiro.books.impl;

import org.springframework.stereotype.Service;

import com.devtiro.books.services.BookServices;

@Service
public class BookServiceImpl implements BookServices {

}

(5)domain/Book.javaを作成する

main/java/com/devtiro/books/domain/Book.java

参考サイト

The Web is Built on REST APIs: Let’s Build One with Java & Spring Boot