HttpURLConnection Sample(Get, Post)

안드로이드 HttpURLConnection Sample입니다.

안드로이드 앱내에서 RestAPI를 이용하여 데이터를 받아오기 위한 통신입니다.

기본적인 Get/Post 샘플입니다.

1. GET 통신

private void HttpGet(){

        new AsyncTask<Void, Void, JSONObject>(){

            @Override
            protected JSONObject doInBackground(Void... voids) {

                JSONObject result = null;
                try{
                    URL url = new URL("요청 URL");
                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                    connection.setRequestProperty("content-type", "application/json");
                    connection.setRequestMethod("GET");         // 통신방식
                    connection.setDoInput(true);                // 읽기모드 지정
                    connection.setUseCaches(false);             // 캐싱데이터를 받을지 안받을지
                    connection.setConnectTimeout(15000);        // 통신 타임아웃

                    int responseCode = connection.getResponseCode();

                    if (responseCode == HttpURLConnection.HTTP_OK || responseCode == HttpURLConnection.HTTP_CREATED) {
                        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                        String inputLine;
                        StringBuffer response = new StringBuffer();
                        while ((inputLine = in.readLine()) != null) {
                            response.append(inputLine);
                        }
                        in.close();

                    } else {
                        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
                        String inputLine;
                        StringBuffer response = new StringBuffer();
                        while ((inputLine = in.readLine()) != null) {
                            response.append(inputLine);
                        }
                        in.close();
                    }

                } catch (ConnectException e) {
                    Log.e(TAG, "ConnectException");
                    e.printStackTrace();


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

                return result;
            }

            @Override
            protected void onPostExecute(JSONObject jsonObject) {
                super.onPostExecute(jsonObject);
            }

        }.execute();
    }

2. POST 통신

private void HttpPost(){
        
        new AsyncTask<Void, Void, JSONObject>(){

            @Override
            protected JSONObject doInBackground(Void... voids) {

                JSONObject result = null;
                try{
                    URL url = new URL("요청 URL");
                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                    connection.setRequestProperty("content-type", "application/x-www-form-urlencoded");
                    connection.setRequestMethod("POST");
                    connection.setDoInput(true);
                    connection.setDoOutput(true);
                    connection.setUseCaches(false);
                    connection.setConnectTimeout(15000);

                    OutputStreamWriter wr = new OutputStreamWriter(connection.getOutputStream());
                    
                    HashMap<String, String> map = new HashMap<>();
                    map.put("키값","데이터값");

StringBuffer sbParams = new StringBuffer();

boolean isAnd = false;
for(String key: map.keySet()){
if(isAnd)
sbParams.append("&");

sbParams.append(key).append("=").append(map.get(key));
if(!isAnd)
if(map.size() >= 2)
isAnd = true;
}

wr.wrtie(sbParams.toString());
wr.flush();
wr.close();

                    int responseCode = connection.getResponseCode();
                    if (responseCode == HttpURLConnection.HTTP_OK || responseCode == HttpURLConnection.HTTP_CREATED) {
                        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                        String inputLine;
                        StringBuffer response = new StringBuffer();
                        while ((inputLine = in.readLine()) != null) {
                            response.append(inputLine);
                        }
                        in.close();

                    } else {
                        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
                        String inputLine;
                        StringBuffer response = new StringBuffer();
                        while ((inputLine = in.readLine()) != null) {
                            response.append(inputLine);
                        }
                        in.close();
                        result = new JSONObject(response.toString());
                    }

                } catch (ConnectException e) {
                    Log.e(TAG, "ConnectException");
                    e.printStackTrace();


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

                return result;
            }

            @Override
            protected void onPostExecute(JSONObject jsonObject) {
                super.onPostExecute(jsonObject);
            }

        }.execute();
    }