Simple Restful Server

기존에 UserApplication.kt 내부에서 만들었던 User 리스트 정보를 UserService 클래스로 이동시킵니다. 그리고 UserService 클래스를 직접 참조하는게 아니라 인터페이스를 통해 접근하기 위해서, IUser 인터페이스와 UserService 클래스로 분리를 합니다.

UserApplication.kt

@SpringBootApplication
class UserApplication

fun main(args: Array<String>) {
    runApplication<UserApplication>(*args)
}

IUser.kt

interface IUser {
    fun getUser(id: Int): User?
    fun searchUser(nameFilter: String): List<User>
    fun createUser(user: User)
    fun updateUser(id: Int, user: User)
    fun deleteUser(id: Int)
}

UserService.kt

@Service
class UserService : IUser {
    private val userMap = ConcurrentHashMap<Int, User>()

    init {
        userMap[1] = User(1, "snowdeer")
        userMap[2] = User(2, "ran")
    }

    override fun getUser(id: Int): User? {
        return userMap[id]
    }

    override fun searchUser(nameFilter: String): List<User> {
        return userMap.filter {
            it.value.name.contains(nameFilter, true)
        }.map(Map.Entry<Int, User>::value).toList()
    }

    override fun createUser(user: User) {
        userMap[user.id] = user
    }

    override fun updateUser(id: Int, user: User) {
        userMap[id] = user
    }

    override fun deleteUser(id: Int) {
        userMap.remove(id)
    }
}

UserController.kt

@RestController
class UserController {

    @Autowired
    private lateinit var service: UserService

    @GetMapping("/user/{id}")
    fun getUser(@PathVariable id: Int): ResponseEntity<User> {
        return ResponseEntity(service.getUser(id), HttpStatus.OK)
    }

    @GetMapping("/users")
    fun userList(): ResponseEntity<List<User>> {
        return ResponseEntity(service.searchUser(""), HttpStatus.OK)
    }

    @GetMapping("/search")
    fun search(@RequestParam(required = false, defaultValue = "") nameFilter: String): ResponseEntity<List<User>> {
        return ResponseEntity(service.searchUser(nameFilter), HttpStatus.OK)
    }

    @PostMapping("/create")
    fun createUser(@RequestBody user: User): ResponseEntity<Unit> {
        service.createUser(user)
        return ResponseEntity(Unit, HttpStatus.OK)
    }

    @DeleteMapping("/delete/{id}")
    fun deleteUser(@PathVariable id: Int): ResponseEntity<Unit> {
        service.deleteUser(id)
        return ResponseEntity(Unit, HttpStatus.OK)
    }

    @PutMapping("/update/{id}")
    fun updateUser(@PathVariable id: Int, @RequestBody user: User): ResponseEntity<Unit> {
        service.updateUser(id, user)
        return ResponseEntity(Unit, HttpStatus.OK)
    }
}

POST 함수 테스트하기

터미널에서 curl 명령어를 이용해서 간단하게 테스트할 수 있습니다.

curl -X POST "http://localhost:8080/create" \
    -H "content-type: application/json" \
    -d '{ 
        "id": 3, 
        "name": "yang" 
        }'