Example usage for java.net HttpURLConnection connect

List of usage examples for java.net HttpURLConnection connect

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Introduction

In this page you can find the example usage for java.net HttpURLConnection connect.

Prototype

public abstract void connect() throws IOException;

Source Link

Document

Opens a communications link to the resource referenced by this URL, if such a connection has not already been established.

Usage

From source file:Main.java

public static boolean hasActiveInternetConnection(Context context) {
    if (isNetworkAvailable(context)) {
        try {//  w w  w . j a v  a  2s .c o m
            HttpURLConnection connection = (HttpURLConnection) (new URL(
                    "http://clients3.google.com/generate_204")).openConnection();
            connection.setRequestProperty("User-Agent", "Test");
            connection.setRequestProperty("Connection", "close");
            connection.setReadTimeout(1500);
            connection.connect();
            return (connection.getResponseCode() == 204 && connection.getContentLength() == 0);
        } catch (IOException e) {
            Log.e("ERROR", "Error checking internet connection");
        }
    } else
        Log.e("ERROR", "No network available");
    return false;
}

From source file:org.cytoscape.app.internal.net.server.ScreenOriginsBeforeResponseTest.java

private static HttpURLConnection connectToURL(String urlString, String method, String origin) throws Exception {
    final URL url = new URL(urlString);
    final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setRequestMethod(method);
    connection.setDoOutput(true);/*from   w  ww .  java  2  s . com*/
    if (origin != null)
        connection.setRequestProperty("Origin", origin);
    connection.setConnectTimeout(1000);
    connection.connect();
    return connection;
}

From source file:Main.java

public static URI unredirect(URI uri) throws IOException {
    if (!REDIRECTOR_DOMAINS.contains(uri.getHost())) {
        return uri;
    }//from  w ww.  ja  v  a 2  s .  c om
    URL url = uri.toURL();

    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setInstanceFollowRedirects(false);
    connection.setDoInput(false);
    connection.setRequestMethod("HEAD");
    connection.setRequestProperty("User-Agent", "ZXing (Android)");
    try {
        connection.connect();
        switch (connection.getResponseCode()) {
        case HttpURLConnection.HTTP_MULT_CHOICE:
        case HttpURLConnection.HTTP_MOVED_PERM:
        case HttpURLConnection.HTTP_MOVED_TEMP:
        case HttpURLConnection.HTTP_SEE_OTHER:
        case 307: // No constant for 307 Temporary Redirect ?
            String location = connection.getHeaderField("Location");
            if (location != null) {
                try {
                    return new URI(location);
                } catch (URISyntaxException e) {
                    // nevermind
                }
            }
        }
        return uri;
    } finally {
        connection.disconnect();
    }
}

From source file:com.rumblefish.friendlymusic.api.WebRequest.java

public static Bitmap getBitmapAtURL(URL url) {
    InputStream inStream = null;//from  w w  w .ja v  a2  s .  c o  m
    HttpURLConnection _conn = null;
    Bitmap bitmap = null;
    try {

        _conn = (HttpURLConnection) url.openConnection();
        _conn.setDoInput(true);
        _conn.connect();
        inStream = _conn.getInputStream();
        bitmap = BitmapFactory.decodeStream(inStream);
        inStream.close();
        _conn.disconnect();
        inStream = null;
        _conn = null;
    } catch (Exception ex) {
        // nothing
    }
    if (inStream != null) {
        try {
            inStream.close();
        } catch (Exception ex) {
        }
    }
    if (_conn != null) {
        _conn.disconnect();
    }

    return bitmap;
}

From source file:itdelatrisu.opsu.downloads.BloodcatServer.java

/**
 * Returns a JSON object from a URL./*from ww  w. java  2 s.  com*/
 * @param url the remote URL
 * @return the JSON object
 * @author Roland Illig (http://stackoverflow.com/a/4308662)
 */
public static JSONObject readJsonFromUrl(URL url) throws IOException {
    // open connection
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setConnectTimeout(Download.CONNECTION_TIMEOUT);
    conn.setReadTimeout(Download.READ_TIMEOUT);
    conn.setUseCaches(false);
    try {
        conn.connect();
    } catch (SocketTimeoutException e) {
        ErrorHandler.error("Connection to server timed out.", e, false);
        throw e;
    }

    if (Thread.interrupted())
        return null;

    // read JSON
    JSONObject json = null;
    try (InputStream in = conn.getInputStream()) {
        BufferedReader rd = new BufferedReader(new InputStreamReader(in));
        StringBuilder sb = new StringBuilder();
        int c;
        while ((c = rd.read()) != -1)
            sb.append((char) c);
        json = new JSONObject(sb.toString());
    } catch (SocketTimeoutException e) {
        ErrorHandler.error("Connection to server timed out.", e, false);
        throw e;
    } catch (JSONException e1) {
        ErrorHandler.error("Failed to create JSON object.", e1, true);
    }
    return json;
}

From source file:com.mopaas_mobile.http.BaseHttpRequester.java

public static String doGETwithHeader(String urlstr, String token, List<BasicNameValuePair> params)
        throws IOException {
    String result = null;//from w  w w  .  j a  v  a  2  s.co  m
    String content = "";
    for (int i = 0; i < params.size(); i++) {
        content = content + "&" + URLEncoder.encode(((NameValuePair) params.get(i)).getName(), "UTF-8") + "="
                + URLEncoder.encode(((NameValuePair) params.get(i)).getValue(), "UTF-8");
    }
    URL url = new URL(urlstr + "?" + content.substring(1));
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setRequestProperty("token", token);
    connection.setDoInput(true);
    connection.setRequestMethod("GET");
    connection.setUseCaches(false);
    connection.connect();
    InputStream is = connection.getInputStream();
    BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"));

    StringBuffer b = new StringBuffer();
    int ch;
    while ((ch = br.read()) != -1) {
        b.append((char) ch);
    }
    result = b.toString().trim();
    connection.disconnect();
    return result;
}

From source file:Main.java

static String downloadUrl(String myurl) throws IOException {
    InputStream is = null;//ww w .ja  va2 s  .  com

    try {
        URL url = new URL(myurl);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestProperty("Authorization", "Basic cm9vdDpvcmllbnRkYg==");
        conn.setReadTimeout(10000);
        conn.setConnectTimeout(15000);
        conn.setRequestMethod("GET");
        conn.setDoInput(true);
        //start
        conn.connect();
        int response = conn.getResponseCode();
        Log.e("The response is: ", "" + response);
        is = conn.getInputStream();
        //converte inputStream in stringa
        String contentAsString = readIt(is);
        return contentAsString;
    } catch (IOException e) {
        Log.e("HTTP", e.getMessage());
        return null;
    } finally {
        if (is != null) {
            is.close();
        }
    }
}

From source file:com.wx.kernel.util.HttpKit.java

/**
 * Send GET request// ww  w .  ja v a2 s . c  om
 */
public static String get(String url, Map<String, String> queryParas, Map<String, String> headers) {
    HttpURLConnection conn = null;
    try {
        conn = getHttpConnection(buildUrlWithQueryString(url, queryParas), GET, headers);
        conn.connect();
        return readResponseString(conn);
    } catch (Exception e) {
        throw new RuntimeException(e);
    } finally {
        if (conn != null) {
            conn.disconnect();
        }
    }
}

From source file:org.pixmob.fm2.util.HttpUtils.java

/**
 * Download a file.//from  w w w.  j a  v  a 2  s .  co m
 */
public static void downloadToFile(Context context, String uri, Set<String> cookies, File outputFile)
        throws IOException {
    final HttpURLConnection conn = newRequest(context, uri, cookies);
    try {
        conn.connect();

        final int sc = conn.getResponseCode();
        if (sc != HttpURLConnection.HTTP_OK) {
            throw new IOException("Cannot download file: " + uri + "; statusCode=" + sc);
        }

        final InputStream input = getInputStream(conn);
        IOUtils.writeToFile(input, outputFile);
    } finally {
        conn.disconnect();
    }
}

From source file:com.ibuildapp.romanblack.CataloguePlugin.imageloader.Utils.java

public static String downloadFile(Context context, String url, String md5) {
    final int BYTE_ARRAY_SIZE = 8024;
    final int CONNECTION_TIMEOUT = 30000;
    final int READ_TIMEOUT = 30000;

    try {//  w w  w. j a v  a2 s. com
        for (int i = 0; i < 3; i++) {
            URL fileUrl = new URL(URLDecoder.decode(url));
            HttpURLConnection connection = (HttpURLConnection) fileUrl.openConnection();
            connection.setConnectTimeout(CONNECTION_TIMEOUT);
            connection.setReadTimeout(READ_TIMEOUT);
            connection.connect();

            int status = connection.getResponseCode();

            if (status >= HttpStatus.SC_BAD_REQUEST) {
                connection.disconnect();

                continue;
            }

            BufferedInputStream bufferedInputStream = new BufferedInputStream(connection.getInputStream());
            File file = new File(StaticData.getCachePath(context) + md5);

            if (!file.exists()) {
                new File(StaticData.getCachePath(context)).mkdirs();
                file.createNewFile();
            }

            FileOutputStream fileOutputStream = new FileOutputStream(file, false);
            int byteCount;
            byte[] buffer = new byte[BYTE_ARRAY_SIZE];

            while ((byteCount = bufferedInputStream.read(buffer, 0, BYTE_ARRAY_SIZE)) != -1)
                fileOutputStream.write(buffer, 0, byteCount);

            bufferedInputStream.close();
            fileOutputStream.flush();
            fileOutputStream.close();

            return file.getAbsolutePath();
        }
    } catch (Exception e) {
        e.printStackTrace();

        return null;
    }

    return null;
}