[Java] 외부 API Json형태로 호출하기

라이엇API

class Http {
    final static String API_KEY = `라이엇 개인용 api_key`;
    
    public Http(String nickname) {
        getSummonerInfo(nickname);
    }

    static String getSummonerInfo(String nickname) {
        HttpURLConnection conn = null;
        String jsonString = null;
        try {
            String SummonerName = nickname.replaceAll(" ", "%20");
            URL url = new URL("https://kr.api.riotgames.com/lol/summoner/v4/summoners/by-name/"+ SummonerName+"?api_key="+API_KEY);
            conn = (HttpURLConnection) url.openConnection();

            conn.setRequestMethod("GET");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty("Transfer-Encoding", "chunked");
            conn.setRequestProperty("Connection", "keep-alive");
            conn.setDoOutput(true);

            // 서버로부터 데이터 읽어오기
            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            StringBuilder sb = new StringBuilder();
            String line = null;

            while((line = br.readLine()) != null) { // 읽을 수 있을 때 까지 반복
                sb.append(line);
            }

            JSONObject obj = new JSONObject(sb.toString()); // json으로 변경 (역직렬화)
            jsonString = "{"
                    + "\"id\": \"" + obj.getString("id") + "\","
                    + "\"accountId\": \"" + obj.getString("accountId") + "\","
                    + "\"puuid\": \"" + obj.getString("puuid") + "\","
                    + "\"name\": \"" + obj.getString("name") + "\","
                    + "\"profileIconId\": \"" + obj.getInt("profileIconId") + "\","
                    + "\"revisionDate\": \"" + obj.getLong("revisionDate") + "\","
                    + "\"summonerLevel\": \"" + obj.getInt("summonerLevel") + "\","
                    + "}";

        } catch (Exception e) {
            e.printStackTrace();
        }

        return jsonString;
    }

URL url = new URL("https://kr.api.riotgames.com/lol/summoner/v4/summoners/by-name/"+ SummonerName+"?api_key="+API_KEY);