Example usage for java.net HttpURLConnection connect

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:de.darkblue.bongloader2.utils.ToolBox.java

/**
 * returns the file size using the config to retrieve the current version of
 * bongloader and setting the right user-agent
 *
 * @param config//from w  ww . j a  v  a  2  s  . co m
 * @param url
 * @return
 * @throws IOException
 */
public static long getFileSize(final Configuration config, final URL url) throws IOException {
    HttpURLConnection connection = null;
    try {
        connection = (HttpURLConnection) url.openConnection();
        if (config != null) {
            connection.setRequestProperty("User-Agent", "BongLoader2 " + config.get(ConfigurationKey.VERSION));
        }
        connection.setConnectTimeout(2000);
        connection.connect();

        final String headerField = connection.getHeaderField("Content-Length");
        if (headerField == null) {
            throw new IOException("Did not get a content length for the connection to " + url);
        }

        final String rawContentLength = headerField.trim();
        return Long.valueOf(rawContentLength);
        //return connection.getContentLength();
    } finally {
        if (connection != null) {
            connection.disconnect();
        }
    }
}

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From source file:edu.stanford.muse.launcher.Main.java

private static boolean killRunningServer(String url) throws IOException {
    try {/*from  w  w w  . ja  v a  2 s. c  o m*/
        // attempt to fetch the page
        // throws a connect exception if the server is not even running
        // so catch it and return false
        String http = url
                + "/exit.jsp?message=Shutdown%20request%20from%20a%20different%20instance%20of%20Muse"; // version num spaces and brackets screw up the URL connection
        System.err.println("Sending a kill request to " + http);
        HttpURLConnection u = (HttpURLConnection) new URL(http).openConnection();
        u.connect();
        if (u.getResponseCode() == 200) {
            u.disconnect();
            return true;
        }
        u.disconnect();
    } catch (ConnectException ce) {
    }
    return false;
}

---

From source file:com.rimbit.android_wallet.ExchangeRatesProvider.java

private static String getURLResult(URL url, final String userAgent) {

    HttpURLConnection connection = null;
    Reader reader = null;//from   w  ww.j a  v  a 2s  .c o  m

    try {
        connection = (HttpURLConnection) url.openConnection();

        connection.setInstanceFollowRedirects(false);
        connection.setConnectTimeout(Constants.HTTP_TIMEOUT_MS);
        connection.setReadTimeout(Constants.HTTP_TIMEOUT_MS);
        connection.addRequestProperty("User-Agent", userAgent);
        connection.connect();

        final int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {

            InputStream is = new BufferedInputStream(connection.getInputStream(), 1024);

            reader = new InputStreamReader(is, Constants.UTF_8);
            final StringBuilder content = new StringBuilder();

            Io.copy(reader, content);
            return content.toString();

        } else {
            log.warn("http status {} when fetching exchange rates from {}", responseCode, RIMBIT_EXPLORER_URL);
        }
    } catch (final Exception x) {
        log.warn("problem fetching exchange rates from " + RIMBIT_EXPLORER_URL, x);
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (final IOException x) {
                // swallow
            }
        }

        if (connection != null)
            connection.disconnect();
    }

    return null;

}

---

From source file:edu.stanford.epadd.launcher.Main.java

private static boolean killRunningServer(String url) throws IOException {
    try {//from www  .  j  av a 2  s  .c o m
        // attempt to fetch the page
        // throws a connect exception if the server is not even running
        // so catch it and return false
        String http = url
                + "/exit.jsp?message=Shutdown%20request%20from%20a%20different%20instance%20of%20ePADD"; // version num spaces and brackets screw up the URL connection
        System.err.println("Sending a kill request to " + http);
        HttpURLConnection u = (HttpURLConnection) new URL(http).openConnection();
        u.connect();
        if (u.getResponseCode() == 200) {
            u.disconnect();
            return true;
        }
        u.disconnect();
    } catch (ConnectException ce) {
    }
    return false;
}

---

From source file:ee.ria.xroad.proxy.ProxyMain.java

private static Map<String, DiagnosticsStatus> checkConnectionToTimestampUrl() {
    Map<String, DiagnosticsStatus> statuses = new HashMap<>();

    for (String tspUrl : ServerConf.getTspUrl()) {
        try {/*from   w  ww  .j a v  a  2 s . co m*/
            URL url = new URL(tspUrl);

            log.info("Checking timestamp server status for url {}", url);

            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            con.setConnectTimeout(DIAGNOSTICS_CONNECTION_TIMEOUT_MS);
            con.setReadTimeout(DIAGNOSTICS_READ_TIMEOUT_MS);
            con.setDoOutput(true);
            con.setDoInput(true);
            con.setRequestMethod("POST");
            con.setRequestProperty("Content-type", "application/timestamp-query");
            con.connect();

            log.info("Checking timestamp server con {}", con);

            if (con.getResponseCode() != HttpURLConnection.HTTP_OK) {
                log.warn("Timestamp check received HTTP error: {} - {}. Might still be ok",
                        con.getResponseCode(), con.getResponseMessage());
                statuses.put(tspUrl,
                        new DiagnosticsStatus(DiagnosticsErrorCodes.RETURN_SUCCESS, LocalTime.now(), tspUrl));
            } else {
                statuses.put(tspUrl,
                        new DiagnosticsStatus(DiagnosticsErrorCodes.RETURN_SUCCESS, LocalTime.now(), tspUrl));
            }

        } catch (Exception e) {
            log.warn("Timestamp status check failed {}", e);

            statuses.put(tspUrl,
                    new DiagnosticsStatus(DiagnosticsUtils.getErrorCode(e), LocalTime.now(), tspUrl));
        }
    }
    return statuses;

}

---

From source file:com.bushstar.htmlcoin_android_wallet.ExchangeRatesProvider.java

private static String getURLResult(URL url, final String userAgent) {

    HttpURLConnection connection = null;
    Reader reader = null;/*  w w  w  .j a  va  2s  .  co  m*/

    try {
        connection = (HttpURLConnection) url.openConnection();

        connection.setInstanceFollowRedirects(false);
        connection.setConnectTimeout(Constants.HTTP_TIMEOUT_MS);
        connection.setReadTimeout(Constants.HTTP_TIMEOUT_MS);
        connection.addRequestProperty("User-Agent", userAgent);
        connection.connect();

        final int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {

            InputStream is = new BufferedInputStream(connection.getInputStream(), 1024);

            reader = new InputStreamReader(is, Constants.UTF_8);
            final StringBuilder content = new StringBuilder();

            Io.copy(reader, content);
            return content.toString();

        } else {
            log.warn("http status {} when fetching exchange rates from {}", responseCode, BTCE_URL);
        }
    } catch (final Exception x) {
        log.warn("problem fetching exchange rates from " + BTCE_URL, x);
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (final IOException x) {
                // swallow
            }
        }

        if (connection != null)
            connection.disconnect();
    }

    return null;

}

---

From source file:com.matthewmitchell.nubits_android_wallet.ExchangeRatesProvider.java

private static String getURLResult(URL url, final String userAgent) {

    HttpURLConnection connection = null;
    Reader reader = null;//ww  w  .  j  a v  a 2  s .c om

    try {
        connection = (HttpURLConnection) url.openConnection();

        connection.setInstanceFollowRedirects(false);
        connection.setConnectTimeout(Constants.HTTP_TIMEOUT_MS);
        connection.setReadTimeout(Constants.HTTP_TIMEOUT_MS);
        connection.addRequestProperty("User-Agent", userAgent);
        connection.connect();

        final int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {

            InputStream is = new BufferedInputStream(connection.getInputStream(), 1024);

            reader = new InputStreamReader(is, Constants.UTF_8);
            final StringBuilder content = new StringBuilder();

            Io.copy(reader, content);
            return content.toString();

        } else {
            log.warn("http status {} when fetching exchange rates from {}", responseCode, url);
        }
    } catch (final Exception x) {
        log.warn("problem fetching exchange rates from " + url, x);
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (final IOException x) {
                // swallow
            }
        }

        if (connection != null)
            connection.disconnect();
    }

    return null;

}

---

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

public static String downloadFileAsString(String url) {
    final int CONNECTION_TIMEOUT = 30000;
    final int READ_TIMEOUT = 30000;

    try {//  w ww .  j a  va 2s. c om
        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;
            }

            BufferedReader bufferedReader = new BufferedReader(
                    new InputStreamReader(connection.getInputStream()));
            StringBuilder stringBuilder = new StringBuilder();
            String line;

            while ((line = bufferedReader.readLine()) != null)
                stringBuilder.append(line);

            bufferedReader.close();

            return stringBuilder.toString();
        }
    } catch (Exception e) {
        e.printStackTrace();

        return null;
    }

    return null;
}

---

From source file:com.example.igorklimov.popularmoviesdemo.helpers.Utility.java

public static String getJsonResponse(String s) {
    HttpURLConnection connection = null;
    InputStream input = null;//  w w  w .j a v  a  2s  .  c  o m
    BufferedReader reader = null;
    String JsonResponse = null;

    try {
        URL url = new URL(s);
        Log.d("TAG", url.toString());
        connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.connect();
        input = connection.getInputStream();
        StringBuilder builder = new StringBuilder();

        if (input != null) {
            reader = new BufferedReader(new InputStreamReader(input));
            String line;

            while ((line = reader.readLine()) != null) {
                builder.append(line).append("\n");
            }
            JsonResponse = builder.toString();
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (connection != null) {
            connection.disconnect();
        }
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (input != null) {
            try {
                input.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return JsonResponse;
}

---

From source file:itdelatrisu.opsu.Utils.java

/**
 * Returns a the contents of a URL as a string.
 * @param url the remote URL//from w  ww  . j  ava  2 s .com
 * @return the contents as a string, or null if any error occurred
 * @author Roland Illig (http://stackoverflow.com/a/4308662)
 * @throws IOException if an I/O exception occurs
 */
public static String readDataFromUrl(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) {
        Log.warn("Connection to server timed out.", e);
        throw e;
    }

    if (Thread.interrupted())
        return null;

    // read contents
    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);
        return sb.toString();
    } catch (SocketTimeoutException e) {
        Log.warn("Connection to server timed out.", e);
        throw e;
    }
}

---

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