심플하게 만들기 위해 Service Layer 없이 Controller만 생성해서 CRUD API를 만들 것이다.

✅ 사용자 생성 API 만들기

1. Controller 틀 만들기

   @RestController
   @RequestMapping("users")
   public class UserController {
     private UserDocumentRepository userDocumentRepository;
   
     public UserController(UserDocumentRepository userDocumentRepository) {
       this.userDocumentRepository = userDocumentRepository;
     }
   
     @PostMapping()
     public UserDocument createUser() {
     }
   }
   
   

2. Request DTO 만들기

   UserCreateRequestDto

   public class UserCreateRequestDto {
     private String id;
     private String name;
     private Long age;
     private Boolean isActive;
   
     public String getId() {
       return id;
     }
   
     public String getName() {
       return name;
     }
   
     public Long getAge() {
       return age;
     }
   
     public Boolean getIsActive() {
       return isActive;
     }
   }
   

   • 참고) 일관성을 위해 메서드명을 getIsActive()라고 지어주자.

3. Controller 완성하기

   @RestController
   @RequestMapping("users")
   public class UserController {
     private UserDocumentRepository userDocumentRepository;
   
     public UserController(UserDocumentRepository userDocumentRepository) {
       this.userDocumentRepository = userDocumentRepository;
     }
   
     @PostMapping()
     public UserDocument createUser(**@RequestBody UserCreateRequestDto requestDto**) {
       **UserDocument user = new UserDocument(requestDto.getId(), requestDto.getName(), requestDto.getAge(), requestDto.getIsActive());
       return userDocumentRepository.save(user);**
     }
   }
   
   

4. Postman으로 테스트해보기

   {
       "id": "1",
       "name": "Jaeseong",
       "age": 20,
       "isActive": true
   }
   

   

{
    "id": "2",
    "name": "JSCODE",
    "age": 25,
    "isActive": false
}

✅ 사용자 조회 API 만들기

1. Controller 만들기

   @RestController
   @RequestMapping("users")
   public class UserController {
     private UserDocumentRepository userDocumentRepository;
   
     public UserController(UserDocumentRepository userDocumentRepository) {
       this.userDocumentRepository = userDocumentRepository;
     }
   
     @PostMapping()
     public UserDocument createUser(@RequestBody UserCreateRequestDto requestDto) {
       UserDocument user = new UserDocument(requestDto.getId(), requestDto.getName(), requestDto.getAge(), requestDto.getIsActive());
       return userDocumentRepository.save(user);
     }
   
     **@GetMapping()
     public Page<UserDocument> findUsers() {
       return userDocumentRepository.findAll(PageRequest.of(0, 10));
     }
   
     @GetMapping("/{id}")
     public UserDocument findUserById(@PathVariable String id) {
       return userDocumentRepository.findById(id)
           .orElseThrow(() -> new RuntimeException("존재하지 않는 사용자입니다."));
     }**
   }
   
   

2. Postman으로 테스트해보기

   GET localhost:8080/users

   

   GET localhost:8080/users/1

   

   GET localhost:8080/users/2

   

✅ 사용자 정보 수정 API 만들기

1. Request DTO 만들기

   UserUpdateRequestDto

   public class UserUpdateRequestDto {
     private String name;
     private Long age;
     private Boolean isActive;
   
     public String getName() {
       return name;
     }
   
     public Long getAge() {
       return age;
     }
   
     public Boolean getIsActive() {
       return isActive;
     }
   }
   

   • 참고) 일관성을 위해 메서드명을 getIsActive()라고 지어주자.

2. Controller 완성하기

   @RestController
   @RequestMapping("users")
   public class UserController {
     private UserDocumentRepository userDocumentRepository;
   
     public UserController(UserDocumentRepository userDocumentRepository) {
       this.userDocumentRepository = userDocumentRepository;
     }
   
     ...
   
     **@PutMapping("/{id}")
     public UserDocument updateUser(@PathVariable String id, @RequestBody UserUpdateRequestDto requestDto) {
       UserDocument existingUser = userDocumentRepository.findById(id)
           .orElseThrow(() -> new RuntimeException("존재하지 않는 사용자입니다."));
       existingUser.setAge(requestDto.getAge());
       existingUser.setName(requestDto.getName());
       existingUser.setIsActive(requestDto.getIsActive());
       return userDocumentRepository.save(existingUser);
     }**
   }
   
   

3. Postman으로 테스트해보기

   

   

✅ 사용자 삭제 API 만들기