Spring Boot Sample Rest API

Membuat simple REST API pertama menggunakan spring boot dengan API spek berikut:

1. Membuat dan menampilkan List Buku
2. Membuat dan menampilkan data buku berdasarkan bookId

1. Buat package controller seperti berikut

2. Buat class BookController

3. Buat Package model dan class BookResponse

package com.hyvercode.spring.model.response;


import java.io.Serializable;

public class BookResponse implements Serializable {

    private int bookId;
    private String bookName;

    public BookResponse(int bookId, String bookName) {
        this.bookId = bookId;
        this.bookName = bookName;
    }

    public int getBookId() {
        return bookId;
    }

    public void setBookId(int bookId) {
        this.bookId = bookId;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }
}

4. Buat API “books” dan endpoint untuk menampilkan data buku dan mengambil data buku berdasarakn bookId

package com.hyvercode.spring.controller;

import com.hyvercode.spring.model.response.BookResponse;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;

import java.util.Arrays;
import java.util.List;

@RestController
@RequestMapping("/books")
public class BookController {
    private final List<BookResponse> bookResponses = Arrays.asList(new BookResponse(1,"Java Basic"),new BookResponse(2,"Spring Boot"));

    @GetMapping(value = "",produces = MediaType.APPLICATION_JSON_VALUE)
    public List<BookResponse> getBooks(){
        return bookResponses.stream().toList();
    }

    @GetMapping(value = "/{bookId}",produces = MediaType.APPLICATION_JSON_VALUE)
    public List<BookResponse> getBook(@PathVariable("bookId") int bookId){
        return bookResponses.stream()
                .filter(bookResponse -> bookResponse.getBookId()==bookId)
                .toList();
    }
}

Selanjutnya jalankan aplikasi dengan perintah berikut:

mvn spring-boot:run

Bukan browser atau Postman akses url http://localhost:8080/books

Bukan browser atau Postman akses url http://localhost:8080/books/1

Sample source code bisa di download di github-hyvercode