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:com.commonsware.cwac.updater.SimpleHttpVersionCheckStrategy.java

@Override
public int getVersionCode() throws Exception {
    HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
    int result = -1;

    try {//from ww w  .j  av  a 2s .  c om
        conn.connect();

        int status = conn.getResponseCode();

        if (status == 200) {
            InputStream is = conn.getInputStream();
            BufferedReader in = new BufferedReader(new InputStreamReader(is));
            StringBuilder buf = new StringBuilder();
            String str;

            while ((str = in.readLine()) != null) {
                buf.append(str);
                buf.append('\n');
            }

            in.close();

            JSONObject json = new JSONObject(buf.toString());

            result = json.getInt(JSON_VERSION_CODE);
            updateURL = json.getString(JSON_UPDATE_URL);
        } else {
            throw new RuntimeException(String.format("Received %d from server", status));
        }
    } finally {
        conn.disconnect();
    }

    return (result);
}

From source file:gmusic.api.comm.HttpUrlConnector.java

@Override
public String dispatchPost(URI address, String json) throws IOException, URISyntaxException {
    HttpURLConnection connection = prepareConnection(address, true, "POST");
    connection.setRequestProperty("Content-Type", "application/json");
    connection.connect();
    connection.getOutputStream().write(json.getBytes());
    if (connection.getResponseCode() != 200) {
        throw new IllegalStateException("Statuscode " + connection.getResponseCode() + " not supported");
    }/*  ww w  .ja va 2 s . co m*/

    String response = IOUtils.toString(connection.getInputStream());
    if (!isStartup) {
        return response;
    }
    return setupAuthentication(response);
}

From source file:edu.wfu.inotado.helper.OAuthHelper.java

@Deprecated
public void sendRequest(AuthStore authStore) throws Exception {
    OAuthConsumer consumer = cacheHelper.getFromCache(authStore.getSystemName(), consumerCache);
    URL url;//from   w w  w .jav  a 2  s  . co m
    url = new URL("https://vigrior.schoolchapters.com/api/v1/courses.json");
    HttpURLConnection request = (HttpURLConnection) url.openConnection();

    consumer.sign(request);

    System.out.println("Sending request...");
    request.connect();
    System.out.println(request.getContent());

    InputStream in = (InputStream) request.getContent();
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    String result, line = reader.readLine();
    result = line;
    while ((line = reader.readLine()) != null) {
        result += line;
    }
    System.out.println(result);
    System.out.println("Response: " + request.getResponseCode() + " " + request.getResponseMessage());

}

From source file:io.apiman.manager.ui.server.servlets.UrlFetchProxyServlet.java

/**
 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
 *//*from www  .j a va  2 s.  c  om*/
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    String url = req.getHeader("X-Apiman-Url"); //$NON-NLS-1$
    if (url == null) {
        resp.sendError(500, "No URL specified in X-Apiman-Url"); //$NON-NLS-1$
        return;
    }

    URL remoteUrl = new URL(url);
    HttpURLConnection remoteConn = (HttpURLConnection) remoteUrl.openConnection();
    InputStream remoteIS = null;
    OutputStream responseOS = null;
    try {
        remoteConn.connect();
        Map<String, List<String>> headerFields = remoteConn.getHeaderFields();
        for (String headerName : headerFields.keySet()) {
            if (headerName == null) {
                continue;
            }
            if (EXCLUDE_HEADERS.contains(headerName)) {
                continue;
            }
            String headerValue = remoteConn.getHeaderField(headerName);
            resp.setHeader(headerName, headerValue);
        }
        resp.setHeader("Cache-control", "no-cache, no-store, must-revalidate"); //$NON-NLS-1$ //$NON-NLS-2$
        remoteIS = remoteConn.getInputStream();
        responseOS = resp.getOutputStream();
        IOUtils.copy(remoteIS, responseOS);
        resp.flushBuffer();
    } catch (Exception e) {
        resp.sendError(500, e.getMessage());
    } finally {
        IOUtils.closeQuietly(responseOS);
        IOUtils.closeQuietly(remoteIS);
    }
}

From source file:com.example.android.networkconnect.DownloadUrl.java

public InputStream downloadUrl(String urlString) throws IOException {
    URL url = new URL(urlString);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setReadTimeout(10000 /* milliseconds */);
    conn.setConnectTimeout(15000 /* milliseconds */);
    conn.setRequestMethod("GET");
    conn.setDoInput(true);/* w w w .  j a  va2s .c  o  m*/
    conn.connect();
    InputStream stream = conn.getInputStream();
    return stream;
}

From source file:org.esupportail.nfctagdroid.requestasync.CsnHttpRequestAsync.java

protected String doInBackground(String... params) {

    CsnMessageBean nfcMsg = new CsnMessageBean();
    nfcMsg.setNumeroId(LocalStorage.getValue("numeroId"));
    nfcMsg.setCsn(params[0]);//from  w  ww  . j  a v  a 2 s.c om
    ObjectMapper mapper = new ObjectMapper();
    String jsonInString = null;
    try {
        jsonInString = mapper.writeValueAsString(nfcMsg);
        URL url = new URL(NfcTacDroidActivity.ESUP_NFC_TAG_SERVER_URL + "/csn-ws");
        log.info("Will call csn-ws on : " + url);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
        conn.connect();
        Writer writer = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream(), "UTF-8"));
        writer.write(jsonInString);
        writer.close();
        InputStream inputStream = conn.getInputStream();
        String response = "";
        String line;
        BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
        while ((line = br.readLine()) != null) {
            response += line;
        }
        conn.disconnect();
        return response;
    } catch (Exception e) {
        throw new NfcTagDroidException(e);
    }
}

From source file:com.gliffy.restunit.http.JavaHttp.java

/** Performs an HTTP PUT. 
 * @param request the request describing the PUT.
 * @return a response//  w  w  w  .  ja  va  2 s  .  c  o  m
 * @throws IOException if HttpURLConnection generated an IO Exception
 */
public HttpResponse put(HttpRequest request) throws IOException {
    HttpURLConnection connection = getConnection(request);
    connection.setRequestMethod("PUT");
    connection.setDoOutput(true);
    connection.connect();
    setBody(request, connection);
    HttpResponse response = createResponse(connection);
    connection.disconnect();
    return response;
}

From source file:com.gliffy.restunit.http.JavaHttp.java

/** Performs an HTTP POST.
 * @param request the request describing the POST.
 * @return a response//from  ww  w  .  j  a  va2 s. c o  m
 * @throws IOException if HttpURLConnection generated an IO Exception
 */
public HttpResponse post(HttpRequest request) throws IOException {
    HttpURLConnection connection = getConnection(request);
    connection.setRequestMethod("POST");
    connection.setDoOutput(true);
    connection.connect();
    setBody(request, connection);
    HttpResponse response = createResponse(connection);
    connection.disconnect();
    return response;
}

From source file:com.google.apphosting.vmruntime.jetty9.VmRuntimeJettyKitchenSinkTest.java

protected int fetchResponseCode(URL url) throws IOException {
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.connect();
    return connection.getResponseCode();
}

From source file:com.adguard.commons.web.UrlUtils.java

/**
 * Downloads content from the specified url using specified proxy (or do not using it) and timeouts.
 * Returns null if there's an error./* ww  w  .j av a 2 s.c  om*/
 *
 * @param url           url
 * @param proxy         proxy to use
 * @param readTimeout   read timeout
 * @param socketTimeout connection timeout
 * @return Downloaded string
 */
public static String downloadString(URL url, Proxy proxy, int readTimeout, int socketTimeout, String encoding,
        int triesCount) {
    IOException lastException = null;

    for (int i = 0; i < triesCount; i++) {
        lastException = null;
        HttpURLConnection connection = null;
        InputStream inputStream = null;

        try {
            connection = (HttpURLConnection) (proxy == null ? url.openConnection() : url.openConnection(proxy));
            connection.setReadTimeout(readTimeout);
            connection.setConnectTimeout(socketTimeout);
            connection.connect();
            inputStream = connection.getInputStream();
            return IOUtils.toString(inputStream, encoding);
        } catch (IOException ex) {
            if (LOG.isDebugEnabled()) {
                LOG.warn("Error downloading string from {}. Try number: {}. Cause:\r\n", url, triesCount, ex);
            } else {
                LOG.warn("Error downloading string from {}. Try number: {}. Cause:{}", url, triesCount,
                        ex.getMessage());
            }
            lastException = ex;
        } finally {
            IOUtils.closeQuietly(inputStream);
            if (connection != null) {
                connection.disconnect();
            }
        }
    }

    if (lastException != null) {
        LOG.error("Could not download string from url: " + url, lastException);
    }

    return null;
}