공공데이터 날씨 API

인증키 - 허가 비밀번호
참고문서 - 활용 가이드

url과 인증키 중요

try-catch하면 안되고 throws해야하는 이유 :
catch는 잡아버리기 때문에 에러가 나도 잡을 떄 까지 꺼지지 않음

/* Javascript 샘플 코드 */


var xhr = new XMLHttpRequest();
var url = 'http://apis.data.go.kr/1360000/VilageFcstInfoService_2.0/getUltraSrtNcst'; /*⭐URL*/
var queryParams = '?' + encodeURIComponent('serviceKey') + '='+'서비스키'; /*Service Key*/ // ? : 쿼리스트링 
queryParams += '&' + encodeURIComponent('pageNo') + '=' + encodeURIComponent('1'); /**/
queryParams += '&' + encodeURIComponent('numOfRows') + '=' + encodeURIComponent('1000'); /**/
queryParams += '&' + encodeURIComponent('dataType') + '=' + encodeURIComponent('XML'); /**/
queryParams += '&' + encodeURIComponent('base_date') + '=' + encodeURIComponent('20210628'); /**/
queryParams += '&' + encodeURIComponent('base_time') + '=' + encodeURIComponent('0600'); /**/
queryParams += '&' + encodeURIComponent('nx') + '=' + encodeURIComponent('55'); /**/
queryParams += '&' + encodeURIComponent('ny') + '=' + encodeURIComponent('127'); /**/
xhr.open('GET', url + queryParams);
xhr.onreadystatechange = function () {
    if (this.readyState == 4) {
        alert('Status: '+this.status+'nHeaders: '+JSON.stringify(this.getAllResponseHeaders())+'nBody: '+this.responseText);
    }
};

xhr.send('');

public class ApiExplorer {
    public static void main(String[] args) throws IOException {
        StringBuilder urlBuilder = new StringBuilder("http://apis.data.go.kr/1360000/VilageFcstInfoService_2.0/getUltraSrtNcst"); /*URL*/
        urlBuilder.append("?" + URLEncoder.encode("serviceKey","UTF-8") + "=서비스키"); /*Service Key*/
        urlBuilder.append("&" + URLEncoder.encode("pageNo","UTF-8") + "=" + URLEncoder.encode("1", "UTF-8")); /*페이지번호*/
        urlBuilder.append("&" + URLEncoder.encode("numOfRows","UTF-8") + "=" + URLEncoder.encode("1000", "UTF-8")); /*한 페이지 결과 수*/
        urlBuilder.append("&" + URLEncoder.encode("dataType","UTF-8") + "=" + URLEncoder.encode("XML", "UTF-8")); /*요청자료형식(XML/JSON) Default: XML*/
        urlBuilder.append("&" + URLEncoder.encode("base_date","UTF-8") + "=" + URLEncoder.encode("20210628", "UTF-8")); /*‘21년 6월 28일 발표*/
        urlBuilder.append("&" + URLEncoder.encode("base_time","UTF-8") + "=" + URLEncoder.encode("0600", "UTF-8")); /*06시 발표(정시단위) */
        urlBuilder.append("&" + URLEncoder.encode("nx","UTF-8") + "=" + URLEncoder.encode("55", "UTF-8")); /*예보지점의 X 좌표값*/
        urlBuilder.append("&" + URLEncoder.encode("ny","UTF-8") + "=" + URLEncoder.encode("127", "UTF-8")); /*예보지점의 Y 좌표값*/
        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()));
        } else {
            rd = new BufferedReader(new InputStreamReader(conn.getErrorStream()));
        }
        StringBuilder sb = new StringBuilder();
        String line;
        while ((line = rd.readLine()) != null) {
            sb.append(line);
        }
        rd.close();
        conn.disconnect();
        System.out.println(sb.toString());
    }

append: 이어 붙이기
Responsecode는 에러 확인용