Example usage for java.io FileOutputStream getChannel

Introduction

In this page you can find the example usage for java.io FileOutputStream getChannel.

Prototype

public FileChannel getChannel() 

Source Link

Document

Returns the unique java.nio.channels.FileChannel FileChannel object associated with this file output stream.

Usage

From source file:HttpGet.java

public static void main(String[] args) {
    SocketChannel server = null; // Channel for reading from server
    FileOutputStream outputStream = null; // Stream to destination file
    WritableByteChannel destination; // Channel to write to it

    try { // Exception handling and channel closing code follows this block

        // Parse the URL. Note we use the new java.net.URI, not URL here.
        URI uri = new URI(args[0]);

        // Now query and verify the various parts of the URI
        String scheme = uri.getScheme();
        if (scheme == null || !scheme.equals("http"))
            throw new IllegalArgumentException("Must use 'http:' protocol");

        String hostname = uri.getHost();

        int port = uri.getPort();
        if (port == -1)
            port = 80; // Use default port if none specified

        String path = uri.getRawPath();
        if (path == null || path.length() == 0)
            path = "/";

        String query = uri.getRawQuery();
        query = (query == null) ? "" : '?' + query;

        // Combine the hostname and port into a single address object.
        // java.net.SocketAddress and InetSocketAddress are new in Java 1.4
        SocketAddress serverAddress = new InetSocketAddress(hostname, port);

        // Open a SocketChannel to the server
        server = SocketChannel.open(serverAddress);

        // Put together the HTTP request we'll send to the server.
        String request = "GET " + path + query + " HTTP/1.1\r\n" + // The request
                "Host: " + hostname + "\r\n" + // Required in HTTP 1.1
                "Connection: close\r\n" + // Don't keep connection open
                "User-Agent: " + HttpGet.class.getName() + "\r\n" + "\r\n"; // Blank
                                                                            // line
                                                                            // indicates
                                                                            // end of
                                                                            // request
                                                                            // headers

        // Now wrap a CharBuffer around that request string
        CharBuffer requestChars = CharBuffer.wrap(request);

        // Get a Charset object to encode the char buffer into bytes
        Charset charset = Charset.forName("ISO-8859-1");

        // Use the charset to encode the request into a byte buffer
        ByteBuffer requestBytes = charset.encode(requestChars);

        // Finally, we can send this HTTP request to the server.
        server.write(requestBytes);/*from www  .  jav a2 s .  c  o m*/

        // Set up an output channel to send the output to.
        if (args.length > 1) { // Use a specified filename
            outputStream = new FileOutputStream(args[1]);
            destination = outputStream.getChannel();
        } else
            // Or wrap a channel around standard out
            destination = Channels.newChannel(System.out);

        // Allocate a 32 Kilobyte byte buffer for reading the response.
        // Hopefully we'll get a low-level "direct" buffer
        ByteBuffer data = ByteBuffer.allocateDirect(32 * 1024);

        // Have we discarded the HTTP response headers yet?
        boolean skippedHeaders = false;
        // The code sent by the server
        int responseCode = -1;

        // Now loop, reading data from the server channel and writing it
        // to the destination channel until the server indicates that it
        // has no more data.
        while (server.read(data) != -1) { // Read data, and check for end
            data.flip(); // Prepare to extract data from buffer

            // All HTTP reponses begin with a set of HTTP headers, which
            // we need to discard. The headers end with the string
            // "\r\n\r\n", or the bytes 13,10,13,10. If we haven't already
            // skipped them then do so now.
            if (!skippedHeaders) {
                // First, though, read the HTTP response code.
                // Assume that we get the complete first line of the
                // response when the first read() call returns. Assume also
                // that the first 9 bytes are the ASCII characters
                // "HTTP/1.1 ", and that the response code is the ASCII
                // characters in the following three bytes.
                if (responseCode == -1) {
                    responseCode = 100 * (data.get(9) - '0') + 10 * (data.get(10) - '0')
                            + 1 * (data.get(11) - '0');

                    // If there was an error, report it and quit
                    // Note that we do not handle redirect responses.
                    if (responseCode < 200 || responseCode >= 300) {
                        System.err.println("HTTP Error: " + responseCode);
                        System.exit(1);
                    }
                }

                // Now skip the rest of the headers.
                try {
                    for (;;) {
                        if ((data.get() == 13) && (data.get() == 10) && (data.get() == 13)
                                && (data.get() == 10)) {
                            skippedHeaders = true;
                            break;
                        }
                    }
                } catch (BufferUnderflowException e) {
                    // If we arrive here, it means we reached the end of
                    // the buffer and didn't find the end of the headers.
                    // There is a chance that the last 1, 2, or 3 bytes in
                    // the buffer were the beginning of the \r\n\r\n
                    // sequence, so back up a bit.
                    data.position(data.position() - 3);
                    // Now discard the headers we have read
                    data.compact();
                    // And go read more data from the server.
                    continue;
                }
            }

            // Write the data out; drain the buffer fully.
            while (data.hasRemaining())
                destination.write(data);

            // Now that the buffer is drained, put it into fill mode
            // in preparation for reading more data into it.
            data.clear(); // data.compact() also works here
        }
    } catch (Exception e) { // Report any errors that arise
        System.err.println(e);
        System.err.println("Usage: java HttpGet <URL> [<filename>]");
    } finally { // Close the channels and output file stream, if needed
        try {
            if (server != null && server.isOpen())
                server.close();
            if (outputStream != null)
                outputStream.close();
        } catch (IOException e) {
        }
    }
}

---

From source file:MainClass.java

private static void test() throws Exception {
    long[] primes = new long[] { 1, 2, 3, 5, 7 };
    File aFile = new File("C:/test/primes.txt");
    FileOutputStream outputFile = null;
    outputFile = new FileOutputStream(aFile);
    FileChannel file = outputFile.getChannel();
    ByteBuffer[] buffers = new ByteBuffer[3];
    buffers[0] = ByteBuffer.allocate(8);
    buffers[2] = ByteBuffer.allocate(8);
    String primeStr = null;// w  w w  .j  a v  a  2 s.  com
    for (long prime : primes) {
        primeStr = "prime = " + prime;
        buffers[0].putDouble((double) primeStr.length()).flip();
        buffers[1] = ByteBuffer.allocate(primeStr.length());
        buffers[1].put(primeStr.getBytes()).flip();
        buffers[2].putLong(prime).flip();
        file.write(buffers);
        buffers[0].clear();
        buffers[2].clear();
    }
    System.out.println("File written is " + file.size() + "bytes.");
    outputFile.close();
}

---

From source file:MainClass.java

private static void createFile() throws Exception {
    long[] primes = new long[] { 1, 2, 3, 5, 7 };
    File aFile = new File("C:/primes.bin");
    FileOutputStream outputFile = new FileOutputStream(aFile);
    FileChannel file = outputFile.getChannel();
    final int BUFFERSIZE = 100;
    ByteBuffer buf = ByteBuffer.allocate(BUFFERSIZE);
    LongBuffer longBuf = buf.asLongBuffer();
    int primesWritten = 0;
    while (primesWritten < primes.length) {
        longBuf.put(primes, primesWritten, min(longBuf.capacity(), primes.length - primesWritten));
        buf.limit(8 * longBuf.position());

        file.write(buf);/*from   w  w  w.  j a v  a2 s. c  o  m*/
        primesWritten += longBuf.position();
        longBuf.clear();
        buf.clear();
    }
    System.out.println("File written is " + file.size() + "bytes.");
    outputFile.close();
}

---

From source file:Main.java

public static void copyFileFast(FileInputStream is, FileOutputStream os) throws IOException {
    FileChannel in = is.getChannel();
    FileChannel out = os.getChannel();
    in.transferTo(0, in.size(), out);//from   ww  w. j  av a2s .co m
}

---

From source file:Main.java

public static void copy(File src, File dst) throws IOException {
    FileInputStream inStream = new FileInputStream(src);
    FileOutputStream outStream = new FileOutputStream(dst);
    FileChannel inChannel = inStream.getChannel();
    FileChannel outChannel = outStream.getChannel();
    inChannel.transferTo(0, inChannel.size(), outChannel);
    inStream.close();//ww w . ja v a2  s .  c  o  m
    outStream.close();
}

---

From source file:Main.java

public static void copyFile(File src, File dst) throws IOException {
    FileInputStream in = new FileInputStream(src);
    FileOutputStream out = new FileOutputStream(dst);
    FileChannel inChannel = in.getChannel();
    FileChannel outChannel = out.getChannel();

    try {//from  ww w.  j  a  v a 2 s  .c  om
        inChannel.transferTo(0, inChannel.size(), outChannel);
    } finally {
        if (inChannel != null) {
            inChannel.close();
        }
        outChannel.close();
    }

    in.close();
    out.close();
}

---

From source file:com.kurento.kmf.test.services.Recorder.java

public static float getPesqMos(String audio, int sampleRate) {
    float pesqmos = 0;

    try {/*  w  w  w .j a  v a  2 s.c om*/
        String pesq = KurentoServicesTestHelper.getTestFilesPath() + "/bin/pesq/PESQ";
        String origWav = "";
        if (audio.startsWith(HTTP_TEST_FILES)) {
            origWav = KurentoServicesTestHelper.getTestFilesPath() + audio.replace(HTTP_TEST_FILES, "");
        } else {
            // Download URL
            origWav = KurentoMediaServerManager.getWorkspace() + "/downloaded.wav";
            URL url = new URL(audio);
            ReadableByteChannel rbc = Channels.newChannel(url.openStream());
            FileOutputStream fos = new FileOutputStream(origWav);
            fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
            fos.close();
        }

        Shell.runAndWait(pesq, "+" + sampleRate, origWav, RECORDED_WAV);
        List<String> lines = FileUtils.readLines(new File(PESQ_RESULTS), "utf-8");
        pesqmos = Float.parseFloat(lines.get(1).split("\t")[2].trim());
        log.info("PESQMOS " + pesqmos);

        Shell.runAndWait("rm", PESQ_RESULTS);

    } catch (IOException e) {
        log.error("Exception recording local audio", e);
    }

    return pesqmos;
}

---

From source file:org.phenotips.textanalysis.internal.BiolarkFileUtils.java

/**
 * Downloads file located at given url and saves it with given filename in the current directory.
 *
 * @param fileName Name under which the file will be saved locally
 * @param url URL of hte file//from   w ww.  j a v  a  2  s .  c o m
 * @return File which was downloaded
 * @throws IOException if downloading fails
 */
public static File downloadFile(String fileName, String url) throws IOException {
    final URL resourcesURL = new URL(url);
    final ReadableByteChannel rbc = Channels.newChannel(resourcesURL.openStream());
    FileOutputStream fos = new FileOutputStream(fileName);
    fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
    fos.close();
    return new File(fileName);
}

---

From source file:org.neo4j.server.webdriver.WebdriverChromeDriver.java

private static ZipFile downloadFile(String fromUrl) {
    System.out.println("Downloading binary from " + fromUrl);
    try {/*  ww w  . jav a2s  .c o  m*/
        URL zipUrl = new URL(fromUrl);
        ReadableByteChannel rbc = Channels.newChannel(zipUrl.openStream());
        File localPath = new File(System.getProperty("java.io.tmpdir"), "chromedriver.zip");
        FileOutputStream zipOutputStream = new FileOutputStream(localPath);
        zipOutputStream.getChannel().transferFrom(rbc, 0, 1 << 24);
        return new ZipFile(localPath);
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

---

From source file:org.kurento.test.utils.Ffmpeg.java

public static float getPesqMos(String audio, int sampleRate) {
    float pesqmos = 0;

    try {/*from  w  w  w  . j a va 2s.  com*/
        String pesq = KurentoTest.getTestFilesDiskPath() + "/bin/pesq/PESQ";
        String origWav = "";
        if (audio.startsWith(HTTP_TEST_FILES)) {
            origWav = KurentoTest.getTestFilesDiskPath() + audio.replace(HTTP_TEST_FILES, "");
        } else {
            // Download URL
            origWav = KurentoTest.getDefaultOutputFile("downloaded.wav");
            URL url = new URL(audio);
            ReadableByteChannel rbc = Channels.newChannel(url.openStream());
            FileOutputStream fos = new FileOutputStream(origWav);
            fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
            fos.close();
        }

        Shell.runAndWait(pesq, "+" + sampleRate, origWav, RECORDED_WAV);
        List<String> lines = FileUtils.readLines(new File(PESQ_RESULTS), "utf-8");
        pesqmos = Float.parseFloat(lines.get(1).split("\t")[2].trim());
        log.debug("PESQMOS " + pesqmos);

        Shell.runAndWait("rm", PESQ_RESULTS);

    } catch (IOException e) {
        log.error("Exception recording local audio", e);
    }

    return pesqmos;
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• »