04. POST API 어노테이션 @RestController : Rest API 설정 @RequestMapping : 리소스를 설정 (method로 구분 가능) @PostMapping : Post Resource 설정 @RequestBody : Request Body 부분 JSON Data Parsing. @JsonProperty : json naming @JsonNaming : class json naming JSON string : value number : value boolean : value object : value { } array : value [ ] { "phone_number" : "010-1111-2222", "age" : 10, "isAgree" : false, "account" ..