Example usage for java.io FileInputStream FileInputStream

List of usage examples for java.io FileInputStream FileInputStream

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Introduction

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

Prototype

public FileInputStream(FileDescriptor fdObj)

Source Link

Document

Creates a FileInputStream by using the file descriptor fdObj, which represents an existing connection to an actual file in the file system.

Usage

From source file:Main.java

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

    // create input streams
    InputStream is = new FileInputStream("C://test.txt");
    FilterInputStream fis = new BufferedInputStream(is);

    // reads and prints filter input stream
    System.out.println((char) fis.read());
    System.out.println((char) fis.read());

    // mark invoked at this position
    fis.mark(0);/*from  w  w w  .  j  a v  a 2s.  co m*/
    System.out.println("mark() invoked");
    System.out.println((char) fis.read());
    System.out.println((char) fis.read());

    // reset() repositioned the stream to the mark
    fis.reset();
    System.out.println("reset() invoked");
    System.out.println((char) fis.read());
    System.out.println((char) fis.read());

}

From source file:Main.java

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

    // create input streams
    InputStream is = new FileInputStream("C://test.txt");
    FilterInputStream fis = new BufferedInputStream(is);

    // reads and prints BufferedReader
    System.out.println((char) fis.read());
    System.out.println((char) fis.read());

    // mark invoked at this position
    fis.mark(0);//  w  w w  .  ja  v  a2 s. c  om
    System.out.println("mark() invoked");
    System.out.println((char) fis.read());
    System.out.println((char) fis.read());

    // reset() repositioned the stream to the mark
    fis.reset();
    System.out.println("reset() invoked");
    System.out.println((char) fis.read());
    System.out.println((char) fis.read());

}

From source file:Main.java

public static void main(String[] args) {
    try {/*w w w  . j  av  a2s . c  o m*/

        OutputStream os = new FileOutputStream("test.txt");

        InputStream is = new FileInputStream("test.txt");

        // write something
        os.write('A');

        // flush the stream
        os.flush();

        // close the stream but it does nothing
        os.close();

        // read what we wrote
        System.out.println((char) is.read());
        is.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) throws Exception {
    File aFile = new File("primes.txt");
    FileInputStream inFile = new FileInputStream(aFile);
    FileChannel inChannel = inFile.getChannel();
    ByteBuffer buf = ByteBuffer.allocateDirect(1024);
    buf.position(buf.limit());/*from w w w.  ja  v a  2s .  co m*/
    while (true) {
        if (buf.remaining() < 8) {
            if (inChannel.read(buf.compact()) == -1) {
                break;
            }
            buf.flip();
        }
        int strLength = (int) buf.getDouble();
        if (buf.remaining() < 2 * strLength) {
            if (inChannel.read(buf.compact()) == -1) {
                break;
            }
            buf.flip();
        }
        byte[] strChars = new byte[2 * strLength];
        buf.get(strChars);
        if (buf.remaining() < 8) {
            if (inChannel.read(buf.compact()) == -1) {
                break;
            }
            buf.flip();
        }
        System.out.println(strLength);
        System.out.println(ByteBuffer.wrap(strChars).asCharBuffer());
        System.out.println(buf.getLong());
    }
    inFile.close();
}

From source file:Main.java

public static void main(String[] args) {
    try {//from  w ww. ja v  a 2 s  .c o  m

        OutputStream os = new FileOutputStream("test.txt");

        InputStream is = new FileInputStream("test.txt");

        // write something
        os.write('A');

        // flush the stream but it does nothing
        os.flush();

        // write something else
        os.write('B');

        // read what we wrote
        System.out.println(is.available());
        os.close();
        is.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    FileInputStream is = new FileInputStream("your.keystore");

    KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
    keystore.load(is, "my-keystore-password".toCharArray());

    String alias = "myalias";
    Certificate cert = keystore.getCertificate(alias);

    CertificateFactory certFact = CertificateFactory.getInstance("X.509");
    CertPath path = certFact.generateCertPath(Arrays.asList(new Certificate[] { cert }));

}

From source file:Main.java

public static void main(String[] args) throws Exception {
    String fromFileName = "from.txt";
    String toFileName = "to.txt";
    FileChannel in = new FileInputStream(fromFileName).getChannel();
    FileChannel out = new FileOutputStream(toFileName).getChannel();

    ByteBuffer buff = ByteBuffer.allocateDirect(32 * 1024);

    while (in.read(buff) > 0) {
        buff.flip();/*from   ww  w.j  a va 2 s. co m*/
        out.write(buff);
        buff.clear();
    }

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

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    String fromFileName = args[0];
    String toFileName = args[1];/* w w  w. j  a va  2 s. com*/
    FileChannel in = new FileInputStream(fromFileName).getChannel();
    FileChannel out = new FileOutputStream(toFileName).getChannel();

    ByteBuffer buff = ByteBuffer.allocate(32 * 1024);

    while (in.read(buff) > 0) {
        buff.flip();
        out.write(buff);
        buff.clear();
    }

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

From source file:Main.java

public static void main(String[] args) throws Exception {
    ObjectInputStream ois = new ObjectInputStream(
            new GZIPInputStream(new FileInputStream(new File("user.dat"))));

    User admin = (User) ois.readObject();
    User foo = (User) ois.readObject();/*  w  w  w.j  av  a 2  s  .  co  m*/

    ois.close();
    System.out.println("Admin = [" + admin + "]");
    System.out.println("Foo = [" + foo + "]");
}

From source file:Main.java

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

    byte[] buffer = new byte[6];

    // create input streams
    InputStream is = new FileInputStream("C://test.txt");
    FilterInputStream fis = new BufferedInputStream(is);

    // returns number of bytes read to buffer
    int i = fis.read(buffer);

    // prints/* ww  w . j a  v a 2 s  .co  m*/
    System.out.println("Number of bytes read: " + i);

    // for each byte in buffer
    for (byte b : buffer) {
        // converts byte to character
        char c = (char) b;

        System.out.println("Character read: " + c);
    }

}