공공데이터 api사용법

 

 

소스 - 

@GetMapping("/api/gong")
    public String gong(@ModelAttribute("orderGongSearch") OrderGongSearch orderGongSearch , Model model) throws IOException, ParseException {
        StringBuilder urlBuilder = new StringBuilder("http://apis.data.go.kr/B552584/ArpltnInforInqireSvc/getCtprvnRltmMesureDnsty"); /*URL*/
        urlBuilder.append("?" + URLEncoder.encode("serviceKey","UTF-8") + serviceKey); /*Service Key*/ //고유의 서비스키
        urlBuilder.append("&" + URLEncoder.encode("returnType","UTF-8") + "=" + URLEncoder.encode("json", "UTF-8")); /*xml 또는 json*/
        urlBuilder.append("&" + URLEncoder.encode("numOfRows","UTF-8") + "=" + URLEncoder.encode("100", "UTF-8")); /*한 페이지 결과 수*/
        urlBuilder.append("&" + URLEncoder.encode("pageNo","UTF-8") + "=" + URLEncoder.encode("1", "UTF-8")); /*페이지번호*/
        urlBuilder.append("&" + URLEncoder.encode("sidoName","UTF-8") + "=" + URLEncoder.encode("경기", "UTF-8")); /*시도 이름(전국, 서울, 부산, 대구, 인천, 광주, 대전, 울산, 경기, 강원, 충북, 충남, 전북, 전남, 경북, 경남, 제주, 세종)*/
        urlBuilder.append("&" + URLEncoder.encode("ver","UTF-8") + "=" + URLEncoder.encode("1.0", "UTF-8")); /*버전별 상세 결과 참고*/
        URL url = new URL(urlBuilder.toString());
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setRequestProperty("Content-type", "application/json");
        System.out.println("Response code: " + conn.getResponseCode());
        BufferedReader rd;
        if(conn.getResponseCode() >= 200 && conn.getResponseCode() <= 300) {
            rd = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"));
        } else {
            rd = new BufferedReader(new InputStreamReader(conn.getErrorStream(),"UTF-8"));
        }
        StringBuilder sb = new StringBuilder();
        String line;
        while ((line = rd.readLine()) != null) {
            sb.append(line);
        }
        rd.close();
        conn.disconnect();

        System.out.println(sb.toString());

        // 1. 문자열 형태의 JSON을 파싱하기 위한 JSONParser 객체 생성.
        JSONParser parser = new JSONParser();
        int i = sb.toString().indexOf("\"items\":[{");
        int j = sb.toString().indexOf(",\"pageNo\"");
        // 2. 문자열을 JSON 형태로 JSONObject 객체에 저장.
        JSONObject obj = (JSONObject)parser.parse("{"+sb.toString().substring(i,j)+"}");
        // 3. 필요한 리스트 데이터 부분만 가져와 JSONArray로 저장.
        JSONArray dataArr = (JSONArray) obj.get("items");
        // 4. model에 담아준다.
        if(!StringUtils.isEmpty(orderGongSearch.getStationName())){
            JSONArray dataArr2 = new JSONArray();
            for (int k = 0; k < dataArr.size(); k++) {
                if(((JSONObject) dataArr.get(k)).get("stationName").equals(orderGongSearch.getStationName())) {
                    dataArr2.add(dataArr.get(k));
                }
            }
            model.addAttribute("data",dataArr2);
        }else {
            model.addAttribute("data",dataArr);
        }

        return "order/orderList2";
    }