ResponseEntity<String> 나중에 정리하자

	@ResponseBody
	@PostMapping("/pay")
	public ResponseEntity<String> feePay(@RequestBody FeePayVO vo) {
		
		try {
			service.feePay(vo);
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		ResponseEntity<String> entity = null;
		try {
			service.feePay(vo);
			entity = new ResponseEntity<String>("SUCCESS",HttpStatus.OK);
		} catch (Exception e) {
			e.printStackTrace();
			entity = new ResponseEntity<String>(e.getMessage(), HttpStatus.BAD_REQUEST);
		}
		
		return entity;
	}

ResponseEntity<String>

 	$.ajax({
		  type : 'post',
		  url : '${cPath}/fr/pay/fee/pay',
		  contentType: 'application/json',
		  data : JSON.stringify(datas),
		  dataType : 'text',
		  success : function(data){
		    alert("SUCCESS?"+data);
		  },
		  error : function(data){
		    alert("납부 실패.");
		  }
	});