Play로 RESTful API 구축

Play REST API 소개

Play 컨트롤러 및 작업

Play에서 경로 정의하기

GET 엔드포인트 구현하기

object GreetingController {
  // This method simulates a Play controller action
  def sayHello(): String = {
    "Hello from your Play API!"
  }
  
  def main(args: Array[String]): Unit = {
    // Simulate receiving a request and calling the action
    val apiResponse = sayHello()
    println(s"Simulated API Response: $apiResponse")
  }
}

경로 매개변수 추출하기

object UserController {
  // This action takes an 'id' as a path parameter
  def getUser(id: Int): String = {
    s"Fetching user details for ID: $id"
  }
  
  def main(args: Array[String]): Unit = {
    // Simulate a request to /users/123
    val userIdFromRequest = 123
    val apiResponse = getUser(userIdFromRequest)
    println(s"Simulated API Response: $apiResponse")
  }
}

요청 본문 및 JSON

POST 엔드포인트 구축하기

object ItemController {
  // Simulate processing a JSON request body
  def createItem(jsonBody: String): String = {
    // In a real Play app: Json.parse(jsonBody).as[ItemCaseClass]
    if (jsonBody.contains("name") && jsonBody.contains("price")) {
      s"Item successfully created! Data: $jsonBody"
    } else {
      "Error: Invalid JSON format. 'name' and 'price' expected."
    }
  }
  
  def main(args: Array[String]): Unit = {
    // Simulate a POST request with a JSON body
    val validJson = """{"name": "Smartphone", "price": 799.99}"""
    println(s"Valid JSON Response: ${createItem(validJson)}")
    
    val invalidJson = """{"product": "Tablet"}"""
    println(s"Invalid JSON Response: ${createItem(invalidJson)}")
  }
}

PUT 및 DELETE 처리하기

JSON 응답 반환하기

object ResponseGenerator {
  // Simulate a case class for the response data
  case class ApiResponse(status: String, message: String)

  // Simulate converting the case class to a JSON string
  def buildJsonResponse(response: ApiResponse): String = {
    s"""{"status": "${response.status}", "message": "${response.message}"}"""
  }

  def main(args: Array[String]): Unit = {
    val successResponse = ApiResponse("success", "Data retrieved successfully")
    println(s"Simulated JSON Output:\n${buildJsonResponse(successResponse)}")

    val errorResponse = ApiResponse("error", "Item not found")
    println(s"Simulated JSON Output:\n${buildJsonResponse(errorResponse)}")
  }
}

경로 매칭 퀴즈

복습 및 다음 단계