Android/HttpRequest通信/HttpURLConnection

サンプル

同期処理のみ(AsyncTaskなどで実行すること)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.net.URL;
 String strGetUrl = "https://api.github.com/feeds";
 // System.setProperty("http.agent", "Dalvik/2.1.0 (Linux; U; Android 9; H8216 Build/PDP-PKQ1.180708.001-10229)"); // System.getProperty("http.agent");
 Log.i("HttpURLConnection", "ua=" + System.getProperty("http.agent"));
 HttpURLConnection urlConn = null;
 InputStream in = null;
 BufferedReader reader = null;
 try {
     URL url = new URL(strGetUrl);
     urlConn = (HttpURLConnection) url.openConnection();
     urlConn.addRequestProperty("Content-Type", "application/json; charset=UTF-8");
     urlConn.setRequestMethod("GET");
//      urlConn.setRequestMethod("POST");
     urlConn.setConnectTimeout(10000); // 10s
     urlConn.setReadTimeout(1000); // 1s
     urlConn.connect();
     int status = urlConn.getResponseCode();
     Log.i("HttpURLConnection","status_code=" + status);
     if (status == HttpURLConnection.HTTP_OK) {
         in = urlConn.getInputStream();
         reader = new BufferedReader(new InputStreamReader(in));
         StringBuilder output = new StringBuilder();
         String line;
         while ((line = reader.readLine()) != null) {
             output.append(line);
         }
         Log.i("HttpURLConnection", "res=" + output.toString());
     }
 } catch (SocketTimeoutException e) {
     e.printStackTrace();
 } catch (IOException e) {
     e.printStackTrace();
 } finally {
     try {
         if (reader != null) {
             reader.close();
         }
         if (urlConn != null) {
             urlConn.disconnect();
         }
     } catch (IOException e) {
         e.printStackTrace();
     }
 }

uaはサーバに接続して変更設定されていることを確認済み。

ドメイン接続許可しないエラーが出るときはこちらを確認

android/開発環境/Android8 [ｼｮｰﾄｶｯﾄ]

参考

https://itsakura.com/java-httpurlconnection

http://d.hatena.ne.jp/Kazuhira/20131026/1382796711

retry処理

本来のget処理をexecGetCore()に入れる

    public boolean execGet() throws Exception {
        Exception tmpException = null;
        for (int retry = 0; retry <= mRetry; retry++) {
            try {
                boolean ret = execGetCore();
                if (ret) {
                    return ret;
                }
            } catch (Exception e) {
                tmpException = e;
            }
        }
        if (Exception != null) {
            throw tmpException;
        }
        return false;
    }