[API] Java API Connection(HttpURLConnection, JSONObject)

.API Connection

API Connection을 위한 예제를 살펴보려고 한다.

예제에서는 request 후 response로 JSON Object를 받는 형태이다.

JSON Object 사용을 위해 JSON.simple import 가 필요하다.

plugin으로 사용 시 "여기"를,

jar 파일을 사용할 경우 "여기"를 참고해보면 좋을 것 같다.

JSON Parser 관련 정보는 아래 글을 참고해보자!

[API] Java JSONParser

.example01 (GET)

API 정보

curl -X GET {BASE_URL}/example01 

-H 'Authorization: {AUTH_KEY}' 

-H 'Content-Type: application/json'

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public JSONObject getExample() {     HttpURLConnection conn = null;     JSONObject responseJson = null;       try {         URL url = new URL(GlobalData.HOST_URL + "/example01");         conn = (HttpURLConnection) url.openConnection();         // Authorization 정보를 head에 넣어주자.         conn.setRequestProperty("Authorization", KeyManger.getInstance().getKey());         // Content-Type 도 마찬가지로 !         conn.setRequestProperty("Content-Type", "application/json");           int responseCode = conn.getResponseCode();         if (responseCode == 401) {             System.out.println("401:: Header를 확인해주세요.");         } else if (responseCode == 500) {             System.out.println("500:: 서버 에러");         } else { // response             BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));             StringBuilder sb = new StringBuilder();             String line = "";             while ((line = br.readLine()) != null) {                 sb.append(line);             }               responseJson = new JSONObject(sb.toString());         }     } catch (MalformedURLException e) {         e.printStackTrace();     } catch (IOException e) {         e.printStackTrace();     } catch (JSONException e) {         System.out.println("not JSON Format response");         e.printStackTrace();     }     return responseJson; } Colored by Color Scripter

cs

.example02 (POST)

API 정보

curl -X POST {BASE_URL}/start

-H 'X-Auth-Token: {X_AUTH_TOKEN}'

-H 'Content-Type: application/json'

-d '{ "problem": 1 }'

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public String getAutoKey(String userKey, int id) {       HttpURLConnection conn = null;     JSONObject responseJson = null;     String response = null;     String startParams = "/" + userKey + "/" + Integer.toString(id);       try {         URL url = new URL(GlobalData.HOST_URL + "/start");         conn = (HttpURLConnection) url.openConnection();         // Set request mothod         conn.setRequestMethod("POST");         // Set Header         conn.setRequestProperty("X-Auth-Token", userKey);         conn.setRequestProperty("Content-Type", "application/json");         // Set Data         conn.setDoOutput(true);         BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream()));         JSONObject commands = new JSONObject();         commands.put("problem", 1);         bw.write(commands.toString());         bw.flush();         bw.close();           int responseCode = conn.getResponseCode();         if (responseCode == 200) { // 성공             BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));             StringBuilder sb = new StringBuilder();             String line = "";             while ((line = br.readLine()) != null) {                 sb.append(line);             }               responseJson = new JSONObject(sb.toString());             response = responseJson.getString("auth_key");         } else {             response = String.valueOf(responseCode);         }     } catch (MalformedURLException e) {         e.printStackTrace();     } catch (IOException e) {         e.printStackTrace();     } catch (JSONException e) {         System.out.println("not JSON Format response");         e.printStackTrace();     }       return response; } Colored by Color Scripter

cs

.example03 (PUT)

API 정보

curl -X PUT {BASE_URL}/simulate

-H 'Authorization: {AUTH_KEY}'

-H 'Content-Type: application/json'

-d '{ "commands": [ { "something_id": 0,

"command": [2, 5, 4, 1, 6] } ... ] }'

 
public JSONObject setSimulate(JSONArray commandArrays) {
    HttpURLConnection conn = null;
    JSONObject responseJson = null;
 
    try {
 
        URL url = new URL(GlobalData.HOST_URL + "/simulate");
        conn = (HttpURLConnection) url.openConnection();
        // set request method
        conn.setRequestMethod("PUT");
        // set Header
        conn.setRequestProperty("Authorization", KeyManger.getInstance().getKey());
        conn.setRequestProperty("Content-Type", "application/json");
        // set Data
        conn.setDoOutput(true);
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream()));
        JSONObject commands = new JSONObject();
        commands.put("commands", commandArrays);
        bw.write(commands.toString());
        bw.flush();
        bw.close();
 
        int responseCode = conn.getResponseCode();
        if (responseCode == 400) {
            System.out.println( "400:: 해당 명령 실행 불가");
        } else if (responseCode == 401) {
            System.out.println("401:: Header 오류");
        } else if (responseCode == 500) {
            System.out.println("500:: 서버 에러");
        } else { // success
            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            StringBuilder sb = new StringBuilder();
            String line = "";
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }
 
            responseJson = new JSONObject(sb.toString());
        }
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (JSONException e) {
        System.out.println("not JSON Format response");
        e.printStackTrace();
    }
    return responseJson;
}