String vs. JsonObject

String

String result = callMicro();
...
System.out.println(result);

->

{"response":{"body":{"totalCount":108, "item":[...."header"...

• 단순한 문자열!!

JsonObject

JsonObject resultObj = JsonParser.parseString(result).getAsJsonObject();
...
System.out.println(resultObj);

->

{"response":{"body":{"totalCount":108, "item":[...."header"...

• "key"를 넣어주면 "value"를 뱉어낸다.
• ✨✨✨KEY값을 이용해서 값(데이터)을 꺼내올 수 있다!!!!

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✨✨✨파싱

OpenApiController

	@GetMapping("micro")
	public String micro() throws Exception{
		
		String result = callMicro();
		
		//json 데이터 파싱하기
//		JsonElement jsonElem = JsonParser.parseString(result);
		JsonObject resultObj = JsonParser.parseString(result).getAsJsonObject();
		
		//3가지 방법
		//resultObj.get("response") -> 리턴타입 : JsonElement
//		JsonObject responseObj = resultObj.getAsJsonObject("response");
		JsonObject responseObj = resultObj.get("response").getAsJsonObject();
		System.out.println("responseObj : "+ responseObj);
//		JsonObject responseObj = (JsonObject) resultObj.get("response");
        //"key"를 넣어주면 "value"를 뱉어낸다.
		
		JsonObject headerObj = responseObj.getAsJsonObject("header");
		System.out.println("headerObj : "+ headerObj);
		JsonObject bodyObj = responseObj.getAsJsonObject("body");
		System.out.println("bodyObj : "+ bodyObj);
		
		//숫자여도 보통 String으로 받는다.
		String totalCount = bodyObj.get("totalCount").getAsString();
		System.out.println("totalCount : "+ totalCount);
		
		//"items":[{}] -> 배열이므로
//		JsonArray items = bodyObj.getAsJsonArray("items");
		JsonArray items = (JsonArray) bodyObj.get("items");
		
		System.out.println("items ::: "+ items);
		
		for(int i=0; i<items.size(); ++i) {
			JsonObject item = items.get(i).getAsJsonObject();
			System.out.println(item);
		}

		return "data/micro";
	}

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✨JsonObject 로 바꾸는 3가지 방법??

//resultObj.get("response") -> 리턴타입 : JsonElement
JsonObject responseObj = resultObj.getAsJsonObject("response");
JsonObject responseObj = resultObj.get("response").getAsJsonObject();
JsonObject responseObj = (JsonObject) resultObj.get("response");

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✨✨✨각 item을 Vo, List에

		System.out.println("items ::: "+ items);
		
		List<ItemVo> itemVoList = new ArrayList<ItemVo>();
		for(int i=0; i<items.size(); ++i) {
			JsonObject item = items.get(i).getAsJsonObject();
			System.out.println(item);
			
			String clearVal = item.get("clearVal").getAsString();
			String sn = item.get("sn").getAsString();
			String districtName = item.get("districtName").getAsString();
			String dataDate = item.get("dataDate").getAsString();
			String issueVal = item.get("issueVal").getAsString();
			
			ItemVo vo = new ItemVo();
			vo.setClearVal(clearVal);
			vo.setSn(sn);
			vo.setDistrictName(districtName);
			vo.setDataDate(dataDate);
			vo.setIssueVal(issueVal);
			
			itemVoList.add(vo);
			
		}
		
		for(ItemVo x : itemVoList) {
			System.out.println(x);
			System.out.println("---------------------------");
		}

ItemVo

@Data
//getter setter toString RequiredArgsConstructor??
public class ItemVo {

	private String clearVal;
	private String sn;
	private String districtName;
	private String dataDate;
	private String issueVal;
}