Example usage for java.io FileInputStream read

Introduction

In this page you can find the example usage for java.io FileInputStream read.

Prototype

public int read(byte b[], int off, int len) throws IOException 

Source Link

Document

Reads up to len bytes of data from this input stream into an array of bytes.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    int sChunk = 8192;

    String zipname = "a.gz";
    FileOutputStream out = new FileOutputStream(zipname);
    GZIPOutputStream zipout = new GZIPOutputStream(out);
    byte[] buffer = new byte[sChunk];

    FileInputStream in = new FileInputStream(args[0]);
    int length;/* w w  w  . jav  a2 s .  c  om*/
    while ((length = in.read(buffer, 0, sChunk)) != -1)
        zipout.write(buffer, 0, length);
    in.close();
    zipout.close();

}

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From source file:Main.java

public static void main(String[] args) throws IOException {

    byte[] bs = new byte[4];
    FileInputStream fis = new FileInputStream("C://test.txt");

    // read bytes to the buffer
    int i = fis.read(bs, 2, 1);

    System.out.println("Number of bytes read: " + i);
    // for each byte in buffer
    for (byte b : bs) {
        // converts byte to character
        char c = (char) b;
        if (b == 0) {
            c = '-';
        }//from w  w  w .  ja  va  2 s .co m
        System.out.println(c);
    }
}

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From source file:MainClass.java

public static void main(String[] args) {

    int bufferSize = 8192;
    // create output stream
    String sourceFileName = "data.txt";
    String zipname = sourceFileName + ".gz";
    GZIPOutputStream zipout;/*from   w w w . j ava 2  s  .c o m*/
    try {
        FileOutputStream out = new FileOutputStream(zipname);
        zipout = new GZIPOutputStream(out);
    } catch (IOException e) {
        System.out.println("Couldn't create " + zipname + ".");
        return;
    }
    byte[] buffer = new byte[bufferSize];
    // compress the file
    try {
        FileInputStream in = new FileInputStream(sourceFileName);
        int length;
        while ((length = in.read(buffer, 0, bufferSize)) != -1)
            zipout.write(buffer, 0, length);
        in.close();
    } catch (IOException e) {
        System.out.println("Couldn't compress " + sourceFileName + ".");
    }
    try {
        zipout.close();
    } catch (IOException e) {
    }
}

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From source file:FileSplitter.java

public static void main(String args[]) throws Exception {
    FileInputStream fis = new FileInputStream(args[0]);
    int size = 1024;
    byte buffer[] = new byte[size];

    int count = 0;
    while (true) {
        int i = fis.read(buffer, 0, size);
        if (i == -1)
            break;

        String filename = args[1] + count;
        FileOutputStream fos = new FileOutputStream(filename);
        fos.write(buffer, 0, i);/* ww w .jav a2  s .c  o m*/
        fos.flush();
        fos.close();

        ++count;
    }
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    CheckedOutputStream checksum = new CheckedOutputStream(new FileOutputStream("data.zip"), new Adler32());
    ZipOutputStream zos = new ZipOutputStream(new BufferedOutputStream(checksum));

    int size = 0;
    byte[] buffer = new byte[1024];

    File dir = new File(".");
    String[] files = dir.list();//from w  w  w  .  ja  v a 2 s .c  o  m

    for (int i = 0; i < files.length; i++) {
        System.out.println("Compressing: " + files[i]);
        FileInputStream fis = new FileInputStream(files[i]);
        ZipEntry zipEntry = new ZipEntry(files[i]);
        zos.putNextEntry(zipEntry);

        while ((size = fis.read(buffer, 0, buffer.length)) > 0) {
            zos.write(buffer, 0, size);
        }
        zos.closeEntry();
        fis.close();
    }
    zos.close();
    System.out.println("Checksum   : " + checksum.getChecksum().getValue());
}

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From source file:org.vuphone.vandyupon.test.ImagePostTester.java

public static void main(String[] args) {
    try {//  ww w.j  a v a2  s  .c om
        File image = new File("2008-05-8 ChrisMikeNinaGrad.jpg");
        byte[] bytes = new byte[(int) image.length()];
        FileInputStream fis = new FileInputStream(image);

        int offset = 0;
        int numRead = 0;
        while (offset < bytes.length && (numRead = fis.read(bytes, offset, bytes.length - offset)) >= 0) {
            offset += numRead;
        }

        fis.close();

        HttpClient c = new DefaultHttpClient();
        HttpPost post = new HttpPost(
                "http://afrl-gift.dre.vanderbilt.edu:8080/vandyupon/events/?type=eventimagepost&eventid=2"
                        + "&time=" + System.currentTimeMillis() + "&resp=xml");

        post.addHeader("Content-Type", "image/jpeg");
        ByteArrayEntity bae = new ByteArrayEntity(bytes);
        post.setEntity(bae);

        try {
            HttpResponse resp = c.execute(post);
            resp.getEntity().writeTo(System.out);
        } catch (IOException e) {
            e.printStackTrace();
        }

    } catch (IOException e) {
        e.printStackTrace();
    }
}

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From source file:UDPSend.java

public static void main(String args[]) {
    try {//from w w  w. j  a  va 2  s.co  m
        // Check the number of arguments
        if (args.length < 3)
            throw new IllegalArgumentException("Wrong number of args");

        // Parse the arguments
        String host = args[0];
        int port = Integer.parseInt(args[1]);

        // Figure out the message to send.
        // If the third argument is -f, then send the contents of the file
        // specified as the fourth argument. Otherwise, concatenate the
        // third and all remaining arguments and send that.
        byte[] message;
        if (args[2].equals("-f")) {
            File f = new File(args[3]);
            int len = (int) f.length(); // figure out how big the file is
            message = new byte[len]; // create a buffer big enough
            FileInputStream in = new FileInputStream(f);
            int bytes_read = 0, n;
            do { // loop until we've read it all
                n = in.read(message, bytes_read, len - bytes_read);
                bytes_read += n;
            } while ((bytes_read < len) && (n != -1));
        } else { // Otherwise, just combine all the remaining arguments.
            String msg = args[2];
            for (int i = 3; i < args.length; i++)
                msg += " " + args[i];
            // Convert the message to bytes using UTF-8 encoding
            message = msg.getBytes("UTF-8");
        }

        // Get the internet address of the specified host
        InetAddress address = InetAddress.getByName(host);

        // Initialize a datagram packet with data and address
        DatagramPacket packet = new DatagramPacket(message, message.length, address, port);

        // Create a datagram socket, send the packet through it, close it.
        DatagramSocket dsocket = new DatagramSocket();
        dsocket.send(packet);
        dsocket.close();
    } catch (Exception e) {
        System.err.println(e);
        System.err.println(usage);
    }
}

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From source file:FileIOApp.java

public static void main(String args[]) throws IOException {
    FileOutputStream outStream = new FileOutputStream("test.txt");
    String s = "This is a test.";
    for (int i = 0; i < s.length(); ++i)
        outStream.write(s.charAt(i));//from   ww  w.  ja  v  a 2 s  . c o m
    outStream.close();
    FileInputStream inStream = new FileInputStream("test.txt");
    int inBytes = inStream.available();
    System.out.println("inStream has " + inBytes + " available bytes");
    byte inBuf[] = new byte[inBytes];
    int bytesRead = inStream.read(inBuf, 0, inBytes);
    System.out.println(bytesRead + " bytes were read");
    System.out.println("They are: " + new String(inBuf));
    inStream.close();
    File f = new File("test.txt");
    f.delete();
}

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From source file:Main.java

public static boolean isWAVFile(String fileName) {

    byte header[] = new byte[16];
    try {/*from   w w  w  .j av a  2 s . c o  m*/
        File f = new File(fileName);
        if (!f.exists()) {
            Log.d("OpusTool", fileName + ":" + "File does not exist.");
            return false;
        }
        long actualLength = f.length();
        FileInputStream io = new FileInputStream(f);
        io.read(header, 0, 16);
        io.close();

        String tag = new String(header, 0, 4) + new String(header, 8, 8);
        if (!tag.equals("RIFFWAVEfmt ")) {
            Log.d("OpusTool", fileName + ":" + "It's not a WAV file!");
            return false;
        }

        long paraLength = (header[4] & 0x000000ff) | ((header[5] << 8) & 0x0000ff00)
                | ((header[6] << 16) & 0x00ff0000) | ((header[7] << 24) & 0xff000000);
        if (paraLength != actualLength - 8) {
            Log.d("OpusTool", fileName + ":" + "It might be a WAV file, but it's corrupted!");
            return false;
        }
        return true;

    } catch (Exception e) {
        Log.d("OpusTool", fileName + ":" + "File Error");
        return false;
    }
}

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From source file:Main.java

static byte[] read(String fname) throws Exception {
    long offset = 0;
    File f = new File(fname);
    long length = f.length();
    byte[] image = new byte[(int) length];
    FileInputStream fis = new FileInputStream(f);
    while (offset < length) {
        offset += fis.read(image, (int) offset, (int) (length - offset));
    }//from  w w w  .j a v a 2 s . c o m
    fis.close();
    return image;
}

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