Example usage for java.net URLConnection connect

Introduction

In this page you can find the example usage for java.net URLConnection 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.github.bonigarcia.wdm.BrowserManager.java

private boolean isNetAvailable() {
    try {/*from ww w .  j  a  v  a  2s.  co m*/
        URL url = getDriverUrl();
        Proxy proxy = createProxy();
        URLConnection conn = proxy != null ? url.openConnection(proxy) : url.openConnection();

        conn.connect();
        return true;
    } catch (IOException e) {
        log.warn("Network not available. Forcing the use of cache");
        return false;
    }
}

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From source file:org.jab.docsearch.utils.NetUtils.java

/**
 * Downloads URL to file/*from w ww .  jav a 2s .  c  o  m*/
 *
 * Content type, content length, last modified and md5 will be set in SpiderUrl
 *
 * @param spiderUrl  URL to download
 * @param file       URL content downloads to this file
 * @return           true if URL successfully downloads to a file
 */
public boolean downloadURLToFile(final SpiderUrl spiderUrl, final String file) {

    boolean downloadOk = false;
    BufferedInputStream inputStream = null;
    BufferedOutputStream outputStream = null;
    try {
        // if the file downloads - save it and return true
        URL url = new URL(spiderUrl.getUrl());
        URLConnection conn = url.openConnection();

        // set connection parameter
        conn.setDoInput(true);
        conn.setDoOutput(false);
        conn.setUseCaches(false);
        conn.setRequestProperty("User-Agent", USER_AGENT);

        // connect
        conn.connect();

        // content type
        spiderUrl.setContentType(getContentType(conn));

        // open streams
        inputStream = new BufferedInputStream(conn.getInputStream());
        outputStream = new BufferedOutputStream(new FileOutputStream(file));

        // copy data from URL to file
        long size = 0;
        int readed = 0;
        while ((readed = inputStream.read()) != -1) {
            size++;
            outputStream.write(readed);
        }

        // set values
        spiderUrl.setContentType(getContentType(conn));
        spiderUrl.setSize(size);

        downloadOk = true;
    } catch (IOException ioe) {
        logger.fatal("downloadURLToFile() failed for URL='" + spiderUrl.getUrl() + "'", ioe);
        downloadOk = false;
    } finally {
        IOUtils.closeQuietly(outputStream);
        IOUtils.closeQuietly(inputStream);
    }

    // set values
    if (downloadOk) {
        spiderUrl.setMd5(FileUtils.getMD5Sum(file));
    }

    return downloadOk;
}

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From source file:org.jab.docsearch.utils.NetUtils.java

/**
 * Get SpiderUrl status/*  w  w  w . j av a 2 s .c om*/
 *
 * Content type, content length, last modified and md5 will be set in SpiderUrl if url is changed
 *
 * @param spiderUrl  URL to check
 * @param file       URL content downloads to to this file
 * @return           -1 if link is broken, 0 if the file is unchanged or 1 if the file
 *                   is different... part of caching algoritm.
 */
public int getURLStatus(final SpiderUrl spiderUrl, final String file) {
    // -1 means broken link
    //  0 means same file
    //  1 means changed

    int status;

    try {
        // attempt to obtain status from date
        URL url = new URL(spiderUrl.getUrl());
        URLConnection conn = url.openConnection();

        // set connection parameter
        conn.setDoInput(true);
        conn.setDoOutput(false);
        conn.setUseCaches(false);
        conn.setRequestProperty("User-Agent", USER_AGENT);

        // connect
        conn.connect();

        // content type
        spiderUrl.setContentType(getContentType(conn));

        // check date
        long spiDate = spiderUrl.getLastModified();
        long urlDate = conn.getLastModified();

        // same if date is equal and not zero
        if (spiDate == urlDate && urlDate != 0) {
            // the file is not changed
            status = 0;
        } else {
            // download the URL and compare hashes
            boolean downloaded = downloadURLToFile(conn, file);
            if (downloaded) {
                // download ok

                // compare file hashes
                String fileHash = FileUtils.getMD5Sum(file);

                if (fileHash.equals(spiderUrl.getMd5())) {
                    // same
                    status = 0;
                } else {
                    // changed
                    status = 1;

                    // set changed values
                    spiderUrl.setSize(FileUtils.getFileSize(file));
                    spiderUrl.setLastModified(urlDate);
                    spiderUrl.setMd5(fileHash);
                }
            } else {
                // download failed

                // broken link
                status = -1;
            }
        }
    } catch (IOException ioe) {
        logger.error("getURLStatus() failed for URL='" + spiderUrl.getUrl() + "'", ioe);
        status = -1;
    }

    return status;
}

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From source file:org.y20k.transistor.helpers.MetadataHelper.java

private void shoutcastProxyReaderLoop(Socket proxy, URLConnection connection) throws IOException {

    connection.setConnectTimeout(5000);// ww  w  . j ava 2  s.  co  m
    connection.setReadTimeout(5000);
    connection.setRequestProperty("Icy-MetaData", "1");
    connection.connect();

    InputStream in = connection.getInputStream();

    OutputStream out = proxy.getOutputStream();
    out.write(("HTTP/1.0 200 OK\r\n" + "Pragma: no-cache\r\n" + "Content-Type: " + connection.getContentType()
            + "\r\n\r\n").getBytes(StandardCharsets.UTF_8));

    byte buf[] = new byte[16384]; // one second of 128kbit stream
    int count = 0;
    int total = 0;
    int metadataSize = 0;
    final int metadataOffset = connection.getHeaderFieldInt("icy-metaint", 0);
    int bitRate = Math.max(connection.getHeaderFieldInt("icy-br", 128), 32);
    LogHelper.v(LOG_TAG,
            "createProxyConnection: connected, icy-metaint " + metadataOffset + " icy-br " + bitRate);
    while (true) {
        count = Math.min(in.available(), buf.length);
        if (count <= 0) {
            count = Math.min(bitRate * 64, buf.length); // buffer half-second of stream data
        }
        if (metadataOffset > 0) {
            count = Math.min(count, metadataOffset - total);
        }

        count = in.read(buf, 0, count);
        if (count == 0) {
            continue;
        }
        if (count < 0) {
            break;
        }

        out.write(buf, 0, count);

        total += count;
        if (metadataOffset > 0 && total >= metadataOffset) {
            // read metadata
            total = 0;
            count = in.read();
            if (count < 0) {
                break;
            }
            count *= 16;
            metadataSize = count;
            if (metadataSize == 0) {
                continue;
            }
            // maximum metadata length is 4080 bytes
            total = 0;
            while (total < metadataSize) {
                count = in.read(buf, total, count);
                if (count < 0) {
                    break;
                }
                if (count == 0) {
                    continue;
                }
                total += count;
                count = metadataSize - total;
            }
            total = 0;
            String[] metadata = new String(buf, 0, metadataSize, StandardCharsets.UTF_8).split(";");
            for (String s : metadata) {
                if (s.indexOf(TransistorKeys.SHOUTCAST_STREAM_TITLE_HEADER) == 0
                        && s.length() >= TransistorKeys.SHOUTCAST_STREAM_TITLE_HEADER.length() + 1) {
                    handleMetadataString(
                            s.substring(TransistorKeys.SHOUTCAST_STREAM_TITLE_HEADER.length(), s.length() - 1));
                    // break;
                }
            }
        }
    }
}

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From source file:com.photon.phresco.framework.rest.api.BuildInfoService.java

private boolean isConnectionAlive(String protocol, String host, int port) {
    boolean isAlive = true;
    try {//from w ww .  jav a 2  s.c  o  m
        Thread.sleep(3000);
        URL url = new URL(protocol, host, port, "");
        URLConnection connection = url.openConnection();
        connection.connect();
    } catch (Exception e) {
        isAlive = false;
    }
    return isAlive;
}

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From source file:io.s4.example.twittertopiccount.TwitterFeedListener.java

public void connectAndRead() throws Exception {
    URL url = new URL(urlString);

    URLConnection connection = url.openConnection();
    String userPassword = userid + ":" + password;
    String encoded = EncodingUtil.getAsciiString(Base64.encodeBase64(EncodingUtil.getAsciiBytes(userPassword)));
    connection.setRequestProperty("Authorization", "Basic " + encoded);
    connection.connect();

    InputStream is = connection.getInputStream();
    InputStreamReader isr = new InputStreamReader(is);
    BufferedReader br = new BufferedReader(isr);

    String inputLine = null;//from   w ww  .j  a  va 2  s . c  om
    while ((inputLine = br.readLine()) != null) {
        if (inputLine.trim().length() == 0) {
            blankCount++;
            continue;
        }
        messageCount++;
        messageQueue.add(inputLine);
    }
}

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From source file:org.wso2.carbon.core.CarbonAxisConfigurator.java

/**
 * Load an AxisConfiguration from the repository directory specified
 *
 * @param repoLocation repoLocation/*from  w  ww.j a  v  a  2s . com*/
 * @param weblocation  weblocation
 * @throws org.wso2.carbon.utils.ServerException ServerException
 */
public void init(String repoLocation, String weblocation) throws ServerException {
    if (repoLocation == null) {
        throw new ServerException("Axis2 repository not specified!");
    }
    this.webLocation = weblocation;

    // Check whether this is a URL
    isUrlRepo = CarbonUtils.isURL(repoLocation);

    if (isUrlRepo) { // Is repoLocation a URL Repo?
        try {
            new URL(repoLocation).openConnection().connect();
        } catch (IOException e) {
            throw new ServerException("Cannot connect to URL repository " + repoLocation, e);
        }
        this.repoLocation = repoLocation;
    } else { // Is repoLocation a file repo?
        File repo = new File(repoLocation);
        if (repo.exists()) {
            this.repoLocation = repo.getAbsolutePath();
        } else {
            this.repoLocation = System.getProperty("wso2wsas.home") + File.separator + repoLocation;
            repo = new File(this.repoLocation);
            if (!repo.exists()) {
                this.repoLocation = null;
                throw new ServerException("Repository location '" + repoLocation + "' not found!");
            }
        }
    }

    axis2xml = CarbonUtils.getAxis2Xml();

    isUrlAxis2Xml = CarbonUtils.isURL(axis2xml);

    if (!isUrlAxis2Xml) { // Is axis2xml a URL to the axis2.xml file?
        File configFile = new File(axis2xml);
        if (!configFile.exists()) {
            //This will fallback to default axis2.xml
            this.axis2xml = null;
            //Thus default
        }
    } else {
        try {
            URLConnection urlConnection = new URL(axis2xml).openConnection();
            urlConnection.connect();
        } catch (IOException e) {
            throw new ServerException("Cannot connect to axis2.xml URL " + repoLocation, e);
        }
        isInitialized = true;
    }
}

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From source file:com.protheos.graphstream.JSONSender.java

/**
 * Send JSONObject message to Gephi server
 * //from w  w w .j a  v a 2 s. c o m
 * @param obj
 *            , the JSON message content
 * @param operation
 *            , the operation sending to the server, like "updateGraph",
 *            "getGraph"
 */
private void doSend(JSONObject obj, String operation) {

    try {
        URL url = new URL("http", host, port, "/" + workspace + "?operation=" + operation + "&format=JSON");

        URLConnection connection = url.openConnection();

        connection.setDoOutput(true);
        connection.connect();

        OutputStream outputStream = null;
        PrintStream out = null;
        try {
            outputStream = connection.getOutputStream();
            out = new PrintStream(outputStream, true);

            out.print(obj.toString() + EOL);
            out.flush();
            out.close();

            // send event message to the server and read the result from the
            // server
            InputStream inputStream = connection.getInputStream();
            BufferedReader bf = new BufferedReader(new InputStreamReader(inputStream));
            String line;
            while ((line = bf.readLine()) != null) {
                // if (debug) debug(line);
            }
            inputStream.close();
        } catch (UnknownServiceException e) {
            // protocol doesn't support output
            e.printStackTrace();
            return;
        }
    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

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From source file:android.webkit.cts.TestWebServer.java

/**
 * Terminate the http server.//from www. j  ava2s . c om
 */
public void shutdown() {
    try {
        // Avoid a deadlock between two threads where one is trying to call
        // close() and the other one is calling accept() by sending a GET
        // request for shutdown and having the server's one thread
        // sequentially call accept() and close().
        URL url = new URL(mServerUri + SHUTDOWN_PREFIX);
        URLConnection connection = openConnection(url);
        connection.connect();

        // Read the input from the stream to send the request.
        InputStream is = connection.getInputStream();
        is.close();

        // Block until the server thread is done shutting down.
        mServerThread.join();

    } catch (MalformedURLException e) {
        throw new IllegalStateException(e);
    } catch (InterruptedException e) {
        throw new RuntimeException(e);
    } catch (IOException e) {
        throw new RuntimeException(e);
    } catch (NoSuchAlgorithmException e) {
        throw new IllegalStateException(e);
    } catch (KeyManagementException e) {
        throw new IllegalStateException(e);
    }

    setInstance(null, mSsl);
}

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From source file:com.bigdata.gom.TestRemoteGOM.java

public void testSimpleJSON() throws RepositoryException, IOException {
    final NanoSparqlObjectManager om = new NanoSparqlObjectManager(m_repo, m_namespace);
    final ValueFactory vf = om.getValueFactory();

    final URI keyname = vf.createURI("attr:/test#name");
    final Resource id = vf.createURI("gpo:test#1");
    //      om.checkValue(id);
    final int transCounter = om.beginNativeTransaction();
    try {/*w  w w .j  a v  a  2  s .co m*/
        IGPO gpo = om.getGPO(id);

        gpo.setValue(keyname, vf.createLiteral("Martyn"));

        om.commitNativeTransaction(transCounter);
    } catch (Throwable t) {
        om.rollbackNativeTransaction();

        throw new RuntimeException(t);
    }

    // Now let's read the data as JSON by connecting directly with the serviceurl
    URL url = new URL(m_serviceURL);
    URLConnection server = url.openConnection();
    try {
        // server.setRequestProperty("Accept", TupleQueryResultFormat.JSON.toString());
        server.setDoOutput(true);
        server.connect();
        PrintWriter out = new PrintWriter(server.getOutputStream());
        out.print("query=SELECT ?p ?v WHERE {<" + id.stringValue() + "> ?p ?v}");
        out.close();
        InputStream inst = server.getInputStream();
        byte[] buf = new byte[2048];
        int curs = 0;
        while (true) {
            int len = inst.read(buf, curs, buf.length - curs);
            if (len == -1) {
                break;
            }
            curs += len;
        }
        if (log.isInfoEnabled())
            log.info("Read in " + curs + " - " + new String(buf, 0, curs));
    } catch (Exception e) {
        e.printStackTrace();
    }

    // clear cached data
    ((ObjectMgrModel) om).clearCache();

    IGPO gpo = om.getGPO(id); // reads from backing journal

    assertTrue("Martyn".equals(gpo.getValue(keyname).stringValue()));
}

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