[spring boot] RequestMapping - GET

RequestMapping Annotation
GET

@RestController
class GreetingController {

    @RequestMapping(value = [("/")], method = [RequestMethod.GET])
    fun greeting(): String {
        return "getMethod, Good to see you"
    }

	// 아래와 같이 변경 가능 
    @GetMapping("/")
    fun greeting(): String {
        return "getMethod, Good to see you"
    }

    @RequestMapping(value = ["/"], method = [RequestMethod.POST])
    fun greetingUser(): String {
        return "postMethod, Good to see you"
    }
    
	// 아래와 같이 변경 가능 
    @PostMapping("/")
    fun greetingUser(): String {
        return "postMethod, Good to see you"
    }


}

파라미터 전달 (get)

@PathVariable

 	@GetMapping("/userNm/{userNm}")
    fun greeting(@PathVariable userNm : String): String {
        return "getMethod, Good to see you! userNm: $userNm"
    }


    @GetMapping("/userName/{userNm}")
    // 변수명 변경하기 위해서 사용 
    fun greeting1(@PathVariable("userNm")  userName : String): String {
        return "getMethod, Good to see you! userName: $userName"
    }

url query문

@GetRequestParam

url ?name=paramNm&email=testEmail

    @GetMapping("/userNm")
    fun greeting2(@RequestParam name: String, @RequestParam email: String): String {
        return "getMethod, Good to see you! userName: \"$name\" :: email : \"$email\""
    }

결과물 : getMethod, Good to see you! userName: "paramNm" :: email : "testEmail"

Map : 변수명이 정의 되지 않은 케이스

    //    Map 형식으로 받음
    @GetMapping("/map")
    fun greeting3(@RequestParam param: Map<String, String>): String {

        val sb = StringBuilder()

        param.entries.forEach { map ->
            sb.append( "${map.key} = ${map.value}, " )
        }
        return "getMethod, Good to see you! userName: \"$sb\""
    }

결과물: getMethod, Good to see you! userName: "name = paramNm, email = testEmail, "

DTO 사용

       // DTO 사용
    @GetMapping("/dto")
    fun greeting4(user: UserDTO): String {
        return "getMethod, Good to see you! userName: \"${user.name}\" :: email : \"${user.email}\""
    }
    
    //DTO 
    data class UserDTO( val name : String ,  val email: String)