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:io.andyc.papercut.api.PrintApi.java

/**
 * Queries the remote Papercut server to get the status of the file
 *
 * e.g.//from  w w  w .  j a v  a2 s .  c  o m
 *
 * {"status":{"code":"hold-release","complete":false,"text":"Held in a
 * queue","formatted":"Held in a queue"},"documentName":"test.rtf",
 * "printer":"Floor1 (Full Colour)","pages":1,"cost":"$0.10"}
 *
 * @param printJob {PrintJob} - the file to check the status on
 *
 * @return {String} - JSON String which includes file metadata
 *
 * @throws NoStatusURLSetException
 * @throws IOException
 */
public static PrintStatusData getFileStatus(PrintJob printJob) throws NoStatusURLSetException, IOException {
    if (Objects.equals(printJob.getStatusCheckURL(), "") || printJob.getStatusCheckURL() == null) {
        throw new NoStatusURLSetException();
    }

    // from: http://stackoverflow.com/a/29889139/2605221
    StringBuilder stringBuffer = new StringBuilder("");
    URL url = new URL(printJob.getStatusCheckURL());
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setRequestProperty("User-Agent", "");
    connection.setRequestMethod("GET");
    connection.setRequestProperty("Accept", "application/json");
    connection.setDoInput(true);
    connection.connect();

    InputStream inputStream = connection.getInputStream();

    BufferedReader rd = new BufferedReader(new InputStreamReader(inputStream));
    String line = "";
    while ((line = rd.readLine()) != null) {
        stringBuffer.append(line);
    }
    return new ObjectMapper().readValue(stringBuffer.toString(), PrintStatusData.class);
}

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From source file:eu.geopaparazzi.library.network.NetworkUtilities.java

/**
 * Sends a string via POST to a given url.
 * //from w  w  w  .j a va2 s .c  o m
 * @param urlStr the url to which to send to.
 * @param string the string to send as post body.
 * @param user the user or <code>null</code>.
 * @param password the password or <code>null</code>.
 * @return the response.
 * @throws Exception
 */
public static String sendPost(String urlStr, String string, String user, String password) throws Exception {
    BufferedOutputStream wr = null;
    HttpURLConnection conn = null;
    try {
        conn = makeNewConnection(urlStr);
        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
        conn.setDoInput(true);
        // conn.setChunkedStreamingMode(0);
        conn.setUseCaches(false);
        if (user != null && password != null) {
            conn.setRequestProperty("Authorization", getB64Auth(user, password));
        }
        conn.connect();

        // Make server believe we are form data...
        wr = new BufferedOutputStream(conn.getOutputStream());
        byte[] bytes = string.getBytes();
        wr.write(bytes);
        wr.flush();

        int responseCode = conn.getResponseCode();
        StringBuilder returnMessageBuilder = new StringBuilder();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));
            while (true) {
                String line = br.readLine();
                if (line == null)
                    break;
                returnMessageBuilder.append(line + "\n");
            }
            br.close();
        }

        return returnMessageBuilder.toString();
    } catch (Exception e) {
        e.printStackTrace();
        throw e;
    } finally {
        if (conn != null)
            conn.disconnect();
    }
}

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From source file:de.jdellay.wallet.ExchangeRatesProvider.java

private static Map<String, ExchangeRate> requestExchangeRates(final URL url, float ccnBtcConversion,
        final String userAgent, final String source, final String... fields) {
    final long start = System.currentTimeMillis();

    HttpURLConnection connection = null;
    Reader reader = null;//from ww  w .j  ava2  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.addRequestProperty("Accept-Encoding", "gzip");
        connection.connect();

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

            InputStream is = new BufferedInputStream(connection.getInputStream(), 1024);
            if ("gzip".equalsIgnoreCase(contentEncoding))
                is = new GZIPInputStream(is);

            reader = new InputStreamReader(is, Constants.UTF_8);
            final StringBuilder content = new StringBuilder();
            final long length = Io.copy(reader, content);

            final Map<String, ExchangeRate> rates = new TreeMap<String, ExchangeRate>();

            final JSONObject head = new JSONObject(content.toString());
            for (final Iterator<String> i = head.keys(); i.hasNext();) {
                final String currencyCode = i.next();
                if (!"timestamp".equals(currencyCode)) {
                    final JSONObject o = head.getJSONObject(currencyCode);

                    for (final String field : fields) {
                        final String rate = o.optString(field, null);

                        if (rate != null) {
                            try {
                                BigDecimal btcRate = new BigDecimal(GenericUtils.toNanoCoins(rate, 0));
                                BigInteger ccnRate = btcRate.multiply(BigDecimal.valueOf(ccnBtcConversion))
                                        .toBigInteger();

                                if (ccnRate.signum() > 0) {
                                    rates.put(currencyCode, new ExchangeRate(currencyCode, ccnRate, source));
                                    break;
                                }
                            } catch (final ArithmeticException x) {
                                log.warn("problem fetching {} exchange rate from {} ({}): {}", currencyCode,
                                        url, contentEncoding, x.getMessage());
                            }
                        }
                    }
                }
            }

            log.info("fetched exchange rates from {} ({}), {} chars, took {} ms", url, contentEncoding, length,
                    System.currentTimeMillis() - start);

            return rates;
        } else {
            log.warn("http status {} when fetching {}", 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;
}

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From source file:in.neoandroid.neoupdate.neoUpdate.java

/**
 * A Simpler HTTPConnection helper./*from  w  w w  . j av a2s .c  o  m*/
 * Used currently.
 */
private static HttpURLConnection getHTTPConnection(String url) throws MalformedURLException, IOException {
    HttpURLConnection c;
    c = (HttpURLConnection) new URL(url).openConnection();
    c.setUseCaches(false);
    c.connect();
    return c;
}

---

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

private static boolean killRunningServer(String url) throws IOException {
    try {//from  www. j ava  2s .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
        out.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:net.bible.service.common.CommonUtils.java

/** return true if URL is accessible
 * //from   w ww .j  a  v a 2  s .c o  m
 * Since Android 3 must do on different or NetworkOnMainThreadException is thrown
 */
public static boolean isHttpUrlAvailable(final String urlString) {
    boolean isAvailable = false;
    final int TIMEOUT_MILLIS = 3000;

    try {
        class CheckUrlThread extends Thread {
            public boolean checkUrlSuccess = false;

            public void run() {
                HttpURLConnection connection = null;
                try {
                    // might as well test for the url we need to access
                    URL url = new URL(urlString);

                    Log.d(TAG, "Opening test connection");
                    connection = (HttpURLConnection) url.openConnection();
                    connection.setConnectTimeout(TIMEOUT_MILLIS);
                    Log.d(TAG, "Connecting to test internet connection");
                    connection.connect();
                    checkUrlSuccess = (connection.getResponseCode() == HttpURLConnection.HTTP_OK);
                    Log.d(TAG, "Url test result for:" + urlString + " is " + checkUrlSuccess);
                } catch (IOException e) {
                    Log.i(TAG, "No internet connection");
                    checkUrlSuccess = false;
                } finally {
                    if (connection != null) {
                        connection.disconnect();
                    }
                }
            }
        }
        ;

        CheckUrlThread checkThread = new CheckUrlThread();
        checkThread.start();
        checkThread.join(TIMEOUT_MILLIS);
        isAvailable = checkThread.checkUrlSuccess;
    } catch (InterruptedException e) {
        Log.e(TAG, "Interrupted waiting for url check to complete", e);
    }
    return isAvailable;
}

---

From source file:main.java.vasolsim.common.GenericUtils.java

/**
 * Returns if a given http based address can be connected to
 *
 * @param address the address/*from   w  w  w .j  a v a  2  s.  c  o  m*/
 *
 * @return if teh connection can be made
 */
public static boolean canConnectToAddress(String address) {
    if (!isValidAddress(address))
        return false;

    try {
        HttpURLConnection connection = (HttpURLConnection) (new URL(address).openConnection());
        connection.setRequestMethod("HEAD");
        connection.connect();
        boolean success = (connection.getResponseCode() == HttpURLConnection.HTTP_OK);
        connection.disconnect();
        return success;
    } catch (Exception e) {
        return false;
    }
}

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From source file:Main.java

@TargetApi(Build.VERSION_CODES.KITKAT)
public static String net(String strUrl, Map<String, Object> params, String method) throws Exception {
    HttpURLConnection conn = null;
    BufferedReader reader = null;
    String rs = null;//from  w  ww  .j a va 2 s  .c  o m
    try {
        StringBuffer sb = new StringBuffer();
        if (method == null || method.equals("GET")) {
            strUrl = strUrl + "?" + urlencode(params);
        }
        URL url = new URL(strUrl);
        conn = (HttpURLConnection) url.openConnection();
        if (method == null || method.equals("GET")) {
            conn.setRequestMethod("GET");
        } else {
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
        }
        conn.setRequestProperty("User-agent", userAgent);
        conn.setUseCaches(false);
        conn.setConnectTimeout(DEF_CONN_TIMEOUT);
        conn.setReadTimeout(DEF_READ_TIMEOUT);
        conn.setInstanceFollowRedirects(false);
        conn.connect();
        if (params != null && method.equals("POST")) {
            try (DataOutputStream out = new DataOutputStream(conn.getOutputStream())) {
                out.writeBytes(urlencode(params));
            }
        }
        InputStream is = conn.getInputStream();
        reader = new BufferedReader(new InputStreamReader(is, DEF_CHATSET));
        String strRead = null;
        while ((strRead = reader.readLine()) != null) {
            sb.append(strRead);
        }
        rs = sb.toString();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (reader != null) {
            reader.close();
        }
        if (conn != null) {
            conn.disconnect();
        }
    }
    return rs;
}

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From source file:core.Web.java

public static String httpRequest(URL url, Map<String, String> properties, JSONObject message) {
    //        System.out.println(url);
    try {//from   ww  w .  jav a2s  .c  o  m
        // Create connection
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        //connection.addRequestProperty("Authorization", API_KEY);
        // Set properties if needed
        if (properties != null && !properties.isEmpty()) {
            properties.forEach(connection::setRequestProperty);
        }
        // Post message
        if (message != null) {
            // Maybe somewhere
            connection.setDoOutput(true);
            //                connection.setRequestProperty("Accept", "application/json");
            try (BufferedWriter writer = new BufferedWriter(
                    new OutputStreamWriter(connection.getOutputStream()))) {
                writer.write(message.toString());
            }
        }
        // Establish connection
        connection.connect();
        int responseCode = connection.getResponseCode();

        if (responseCode != 200) {
            System.err.println("Error " + responseCode + ":" + url);
            return null;
        }

        try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
            String line;
            String content = "";
            while ((line = reader.readLine()) != null) {
                content += line;
            }
            return content;
        }

    } catch (IOException ex) {
        Logger.getLogger(Web.class.getName()).log(Level.SEVERE, null, ex);
    }
    return null;
}

---

From source file:edu.stanford.muse.index.NER.java

/** returns a list of <name, #occurrences> */
public static List<Pair<String, Float>> namesFromURL(String url, boolean removeCommonNames)
        throws ClassCastException, IOException, ClassNotFoundException {
    // only http conns allowed currently
    Indexer.log.info(url);//from ww w  .j a  v  a  2  s.co  m
    HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
    conn.setInstanceFollowRedirects(true);
    conn.setRequestProperty("User-agent",
            "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:6.0.2) Gecko/20100101 Firefox/6.0.2");
    conn.connect();
    Indexer.log.info("url for extracting names:" + conn.getURL());
    byte[] b = Util.getBytesFromStream(conn.getInputStream());
    String text = new String(b, "UTF-8");
    text = Util.unescapeHTML(text);
    org.jsoup.nodes.Document doc = Jsoup.parse(text);
    text = doc.body().text();
    return namesFromText(text, removeCommonNames);
}

---

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