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:BihuHttpUtil.java

/**
 * ??HTTPJSON?/*ww w . ja v a2 s . c  om*/
 * @param url
 * @param jsonStr
 */
public static String sendPostForJson(String url, String jsonStr) {
    StringBuffer sb = new StringBuffer("");
    try {
        //
        URL realUrl = new URL(url);
        HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.setRequestMethod("POST");
        connection.setUseCaches(false);
        connection.setInstanceFollowRedirects(true);
        connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
        connection.connect();
        //POST
        DataOutputStream out = new DataOutputStream(connection.getOutputStream());
        out.write(jsonStr.getBytes("UTF-8"));//???
        out.flush();
        out.close();
        //??
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String lines;
        while ((lines = reader.readLine()) != null) {
            lines = new String(lines.getBytes(), "utf-8");
            sb.append(lines);
        }
        reader.close();
        // 
        connection.disconnect();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return sb.toString();
}

---

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

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

    HttpURLConnection connection = null;
    Reader reader = null;//from   w w w.  j  a v a  2  s .  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.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, Charsets.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 rateStr = o.optString(field, null);

                        if (rateStr != null) {
                            try {
                                final Fiat rate = Fiat.parseFiat(currencyCode, rateStr);

                                if (rate.signum() > 0) {
                                    rates.put(currencyCode, new ExchangeRate(
                                            new org.bitcoinj.utils.ExchangeRate(rate), source));
                                    break;
                                }
                            } catch (final NumberFormatException 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 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.screenslicer.core.util.Email.java

public static void sendResults(EmailExport export) {
    if (WebApp.DEV) {
        return;/*from  w w w.  j av  a 2s. c  o  m*/
    }
    Map<String, Object> params = new HashMap<String, Object>();
    params.put("key", Config.instance.mandrillKey());
    List<Map<String, String>> to = new ArrayList<Map<String, String>>();
    for (int i = 0; i < export.recipients.length; i++) {
        to.add(CommonUtil.asMap("email", "name", "type", export.recipients[i],
                export.recipients[i].split("@")[0], "to"));
    }
    List<Map<String, String>> attachments = new ArrayList<Map<String, String>>();
    for (Map.Entry<String, byte[]> entry : export.attachments.entrySet()) {
        attachments.add(CommonUtil.asMap("type", "name", "content", new Tika().detect(entry.getValue()),
                entry.getKey(), Base64.encodeBase64String(entry.getValue())));
    }
    params.put("message", CommonUtil.asObjMap("track_clicks", "track_opens", "html", "text", "headers",
            "subject", "from_email", "from_name", "to", "attachments", false, false, "Results attached.",
            "Results attached.", CommonUtil.asMap("Reply-To", Config.instance.mandrillEmail()), export.title,
            Config.instance.mandrillEmail(), Config.instance.mandrillEmail(), to, attachments));
    params.put("async", true);
    HttpURLConnection conn = null;
    String resp = null;
    Log.info("Sending email: " + export.title, false);
    try {
        conn = (HttpURLConnection) new URL("https://mandrillapp.com/api/1.0/messages/send.json")
                .openConnection();
        conn.setDoOutput(true);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/json");
        conn.setRequestProperty("User-Agent", "Mandrill-Curl/1.0");
        String data = CommonUtil.gson.toJson(params, CommonUtil.objectType);
        byte[] bytes = data.getBytes("utf-8");
        conn.setRequestProperty("Content-Length", "" + bytes.length);
        OutputStream os = conn.getOutputStream();
        os.write(bytes);
        conn.connect();
        resp = IOUtils.toString(conn.getInputStream(), "utf-8");
        if (resp.contains("\"rejected\"") || resp.contains("\"invalid\"")) {
            Log.warn("Invalid/rejected email addreses");
        }
    } catch (Exception e) {
        Log.exception(e);
    }
}

---

From source file:com.vaguehope.onosendai.util.HttpHelper.java

private static <R> R fetchWithFollowRedirects(final Method method, final URL url,
        final HttpStreamHandler<R> streamHandler, final int redirectCount)
        throws IOException, URISyntaxException {
    final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    try {//from  w  w  w  .  j a v  a  2  s. c  om
        connection.setRequestMethod(method.toString());
        connection.setInstanceFollowRedirects(false);
        connection.setConnectTimeout((int) TimeUnit.SECONDS.toMillis(HTTP_CONNECT_TIMEOUT_SECONDS));
        connection.setReadTimeout((int) TimeUnit.SECONDS.toMillis(HTTP_READ_TIMEOUT_SECONDS));
        connection.setRequestProperty("User-Agent", "curl/1"); // Make it really clear this is not a browser.
        //connection.setRequestProperty("Accept-Encoding", "identity"); This fixes missing Content-Length headers but feels wrong.
        connection.connect();

        InputStream is = null;
        try {
            final int responseCode = connection.getResponseCode();

            // For some reason some devices do not follow redirects. :(
            if (responseCode == 301 || responseCode == 302 || responseCode == 303 || responseCode == 307) { // NOSONAR not magic numbers.  Its HTTP spec.
                if (redirectCount >= MAX_REDIRECTS)
                    throw new TooManyRedirectsException(responseCode, url, MAX_REDIRECTS);
                final String locationHeader = connection.getHeaderField("Location");
                if (locationHeader == null)
                    throw new HttpResponseException(responseCode,
                            "Location header missing.  Headers present: " + connection.getHeaderFields() + ".");
                connection.disconnect();

                final URL locationUrl;
                if (locationHeader.toLowerCase(Locale.ENGLISH).startsWith("http")) {
                    locationUrl = new URL(locationHeader);
                } else {
                    locationUrl = url.toURI().resolve(locationHeader).toURL();
                }
                return fetchWithFollowRedirects(method, locationUrl, streamHandler, redirectCount + 1);
            }

            if (responseCode < 200 || responseCode >= 300) { // NOSONAR not magic numbers.  Its HTTP spec.
                throw new NotOkResponseException(responseCode, connection, url);
            }

            is = connection.getInputStream();
            final int contentLength = connection.getContentLength();
            if (contentLength < 1)
                LOG.w("Content-Length=%s for %s.", contentLength, url);
            return streamHandler.handleStream(connection, is, contentLength);
        } finally {
            IoHelper.closeQuietly(is);
        }
    } finally {
        connection.disconnect();
    }
}

---

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

/**
 * Sends an HTTP GET request to a url//w ww. j a  va2  s  . co  m
 *
 * @param urlStr - The URL of the server. (Example: " http://www.yahoo.com/search")
 * @param file the output file. If it is a folder, it tries to get the file name from the header.
 * @param requestParameters - all the request parameters (Example: "param1=val1&param2=val2"). 
 *           Note: This method will add the question mark (?) to the request - 
 *           DO NOT add it yourself
 * @param user
 * @param password
 * @return the file written. 
 * @throws Exception 
 */
public static File sendGetRequest4File(String urlStr, File file, String requestParameters, String user,
        String password) throws Exception {
    if (requestParameters != null && requestParameters.length() > 0) {
        urlStr += "?" + requestParameters;
    }
    HttpURLConnection conn = makeNewConnection(urlStr);
    conn.setRequestMethod("GET");
    // 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();

    if (file.isDirectory()) {
        // try to get the header
        String headerField = conn.getHeaderField("Content-Disposition");
        String fileName = null;
        if (headerField != null) {
            String[] split = headerField.split(";");
            for (String string : split) {
                String pattern = "filename=";
                if (string.toLowerCase().startsWith(pattern)) {
                    fileName = string.replaceFirst(pattern, "");
                    break;
                }
            }
        }
        if (fileName == null) {
            // give a name
            fileName = "FILE_" + LibraryConstants.TIMESTAMPFORMATTER.format(new Date());
        }
        file = new File(file, fileName);
    }

    InputStream in = null;
    FileOutputStream out = null;
    try {
        in = conn.getInputStream();
        out = new FileOutputStream(file);

        byte[] buffer = new byte[(int) maxBufferSize];
        int bytesRead = in.read(buffer, 0, (int) maxBufferSize);
        while (bytesRead > 0) {
            out.write(buffer, 0, bytesRead);
            bytesRead = in.read(buffer, 0, (int) maxBufferSize);
        }
        out.flush();

    } finally {
        if (in != null)
            in.close();
        if (out != null)
            out.close();
    }
    return file;
}

---

From source file:net.drgnome.virtualpack.util.Util.java

public static boolean hasUpdate(int projectID, String version) {
        try {/*w ww. j av a 2s .  c  o  m*/
            HttpURLConnection con = (HttpURLConnection) (new URL(
                    "https://api.curseforge.com/servermods/files?projectIds=" + projectID)).openConnection();
            con.setConnectTimeout(5000);
            con.setRequestMethod("GET");
            con.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; JVM)");
            con.setRequestProperty("Pragma", "no-cache");
            con.connect();
            JSONArray json = (JSONArray) JSONValue.parse(new InputStreamReader(con.getInputStream()));
            String[] cdigits = ((String) ((JSONObject) json.get(json.size() - 1)).get("name")).toLowerCase()
                    .split("\\.");
            String[] vdigits = version.toLowerCase().split("\\.");
            int max = vdigits.length > cdigits.length ? cdigits.length : vdigits.length;
            int a;
            int b;
            for (int i = 0; i < max; i++) {
                a = b = 0;
                try {
                    a = Integer.parseInt(cdigits[i]);
                } catch (Exception e1) {
                    char[] c = cdigits[i].toCharArray();
                    for (int j = 0; j < c.length; j++) {
                        a += (c[j] << ((c.length - (j + 1)) * 8));
                    }
                }
                try {
                    b = Integer.parseInt(vdigits[i]);
                } catch (Exception e1) {
                    char[] c = vdigits[i].toCharArray();
                    for (int j = 0; j < c.length; j++) {
                        b += (c[j] << ((c.length - (j + 1)) * 8));
                    }
                }
                if (a > b) {
                    return true;
                } else if (a < b) {
                    return false;
                } else if ((i == max - 1) && (cdigits.length > vdigits.length)) {
                    return true;
                }
            }
        } catch (Exception e) {
        }
        return false;
    }

---

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

private static boolean killRunningServer(String url) throws IOException {
    try {//ww w  .j  a  va 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
        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:org.wso2.carbon.appmanager.integration.ui.Util.HttpUtil.java

public static HttpResponse doGet(String endpoint, Map<String, String> headers) throws IOException {
    HttpResponse httpResponse;//from  w  ww.j  ava  2  s  .  co  m
    if (endpoint.startsWith("http://")) {
        URL url = new URL(endpoint);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setDoOutput(true);
        conn.setReadTimeout(30000);

        // setting headers
        if (headers != null && headers.size() > 0) {
            Iterator<String> itr = headers.keySet().iterator();
            while (itr.hasNext()) {
                String key = itr.next();
                conn.setRequestProperty(key, headers.get(key));
            }
        }

        conn.connect();

        // Get the response
        StringBuilder sb = new StringBuilder();
        BufferedReader rd = null;
        try {
            rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = rd.readLine()) != null) {
                sb.append(line);
            }
            httpResponse = new HttpResponse(sb.toString(), conn.getResponseCode());
            httpResponse.setResponseMessage(conn.getResponseMessage());

        } catch (IOException ignored) {
            rd = new BufferedReader(new InputStreamReader(conn.getErrorStream()));
            String line;
            while ((line = rd.readLine()) != null) {
                sb.append(line);
            }
            httpResponse = new HttpResponse(sb.toString(), conn.getResponseCode());
            httpResponse.setResponseMessage(conn.getResponseMessage());
        } finally {
            if (rd != null) {
                rd.close();
            }
        }

        return httpResponse;
    }
    return null;
}

---

From source file:com.cannabiscoin.wallet.ExchangeRatesProvider.java

private static Object getCoinValueBTC_BTER() {
    Date date = new Date();
    long now = date.getTime();

    //final Map<String, ExchangeRate> rates = new TreeMap<String, ExchangeRate>();
    // Keep the LTC rate around for a bit
    Double btcRate = 0.0;// ww w .j a v  a 2 s . c o m
    String currency = CoinDefinition.cryptsyMarketCurrency;
    String url = "https://bittrex.com/api/v1.1/public/getticker?market=BTC-CANN";

    HttpURLConnection connection = null;
    try {
        // final String currencyCode = currencies[i];
        final URL URL_bter = new URL(url);
        connection = (HttpURLConnection) URL_bter.openConnection();
        connection.setConnectTimeout(Constants.HTTP_TIMEOUT_MS * 2);
        connection.setReadTimeout(Constants.HTTP_TIMEOUT_MS * 2);
        connection.connect();

        final StringBuilder content = new StringBuilder();

        Reader reader = null;
        try {
            reader = new InputStreamReader(new BufferedInputStream(connection.getInputStream(), 1024));
            Io.copy(reader, content);
            final JSONObject head = new JSONObject(content.toString());
            String result = head.getString("result");
            if (result.equals("true")) {

                Double averageTrade = head.getDouble("Bid");

                if (currency.equalsIgnoreCase("BTC"))
                    btcRate = averageTrade;
            }

        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (final IOException x) {
                    // swallow
                }
            }
        }
        return btcRate;
    } catch (final IOException x) {
        x.printStackTrace();
    } catch (final JSONException x) {
        x.printStackTrace();
    } finally {
        if (connection != null)
            connection.disconnect();
    }

    return null;
}

---

From source file:com.example.android.ennis.barrett.popularmovies.asynchronous.TMDbSyncUtil.java

private static String fetch(Uri uri) {
    HttpURLConnection connection = null;
    BufferedReader reader = null;
    String rawJSON = "";

    Log.d(TAG, uri.toString());//from   w  ww. j  a  v  a  2s .com
    try {
        URL url = new URL(uri.toString()); //java.net Malformed uri exception

        connection = (HttpURLConnection) url.openConnection(); //java.io.  IO exception
        connection.setRequestMethod("GET"); //java.net.ProtocolException && unnecessary
        connection.connect(); //java.io.IOExecption

        InputStream inputStream = connection.getInputStream(); // java.io.IOException
        StringBuffer stringBuffer = new StringBuffer();

        if (inputStream == null) {
            return rawJSON;
        }
        reader = new BufferedReader(new InputStreamReader(inputStream));

        //Make the string more readable
        String line;
        while ((line = reader.readLine()) != null) {
            stringBuffer.append(line + "\n");
        }

        rawJSON = stringBuffer.toString();
        Log.d(TAG + "doInBackground", rawJSON);

    } catch (IOException e) {
        Log.e(TAG, "Error ", e);
        e.printStackTrace();
    } finally {
        if (connection != null) {
            connection.disconnect();
        }
        if (reader != null) {
            try {
                reader.close();
            } catch (final IOException e) {
                Log.e(TAG, "Error closing stream", e);
            }
        }
    }

    return rawJSON;
}

---

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