Example usage for java.io FileInputStream FileInputStream

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) {

    char[] arr = { 'H', 'e', 'l', 'l', 'o' };

    try {/*ww w . j a  v a 2  s. c  om*/

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

        // create a new FileInputStream to read what we write
        FileInputStream in = new FileInputStream("test.txt");

        // write something in the file
        writer.write(arr, 0, 3);

        // flush the stream
        writer.flush();

        // read what we write
        for (int i = 0; i < 3; i++) {
            System.out.print((char) in.read());
        }

        writer.close();
        in.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

From source file:Main.java

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

    byte b = 66;//from ww  w  .  j  a v  a 2  s .  c  om
    int i = 0;
    FileOutputStream fos = new FileOutputStream(new File("C://test1.txt"));

    fos.write(b);

    fos.flush();

    FileInputStream fis = new FileInputStream("C://test.txt");

    // read till the end of the file
    while ((i = fis.read()) != -1) {
        // convert integer to character
        char c = (char) i;

        System.out.print(c);
    }
    fos.close();
    fis.close();
}

From source file:MainClass.java

public static void main(String[] args) {
    File aFile = new File("primes.txt");
    FileInputStream inFile = null;
    try {/*from   ww w.j a va  2 s.c om*/
        inFile = new FileInputStream(aFile);
    } catch (FileNotFoundException e) {
        e.printStackTrace(System.err);
    }
    FileChannel inChannel = inFile.getChannel();
    try {
        ByteBuffer lengthBuf = ByteBuffer.allocate(8);
        while (true) {
            if (inChannel.read(lengthBuf) == -1) {
                break;
            }
            lengthBuf.flip();
            int strLength = (int) lengthBuf.getDouble();
            ByteBuffer buf = ByteBuffer.allocate(2 * strLength + 8);
            if (inChannel.read(buf) == -1) {
                break;
            }
            buf.flip();
            byte[] strChars = new byte[2 * strLength];
            buf.get(strChars);
            System.out.println(strLength);
            System.out.println(ByteBuffer.wrap(strChars).asCharBuffer());
            System.out.println(buf.getLong());
            lengthBuf.clear();
        }
        inFile.close();
    } catch (IOException e) {
        e.printStackTrace(System.err);
    }
}

From source file:Main.java

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

    byte b = 66;//from   w  w  w . j ava 2s .c om
    int i = 0;
    FileOutputStream fos = new FileOutputStream(new File("C://test1.txt"), true);

    fos.write(b);

    fos.flush();

    FileInputStream fis = new FileInputStream("C://test.txt");

    // read till the end of the file
    while ((i = fis.read()) != -1) {
        // convert integer to character
        char c = (char) i;

        System.out.print(c);
    }
    fos.close();
    fis.close();
}

From source file:Main.java

public static void main(String args[]) throws Exception {
    Properties props = new Properties();

    props = new java.util.Properties();
    String path = new Main().getClass().getProtectionDomain().getCodeSource().getLocation().toString()
            .substring(6);/* w ww  . j a  va  2s  . co  m*/
    FileInputStream fis = new FileInputStream(new File(path + "\\myprops.props"));
    props.load(fis);
    System.out.println(props);

}

From source file:MainClass.java

public static void main(String[] args) {

    for (int i = 0; i < args.length; i++) {
        try {//  w  w w.j  a va  2s  .  co m
            InputStream fin = new FileInputStream(args[i]);
            OutputStream fout = new FileOutputStream(args[i] + GZIP_SUFFIX);
            GZIPOutputStream gzout = new GZIPOutputStream(fout);
            for (int c = fin.read(); c != -1; c = fin.read()) {
                gzout.write(c);
            }
            gzout.close();
        } catch (IOException ex) {
            System.err.println(ex);
        }
    }
}

From source file:NIOCopy.java

public static void main(String args[]) throws Exception {
    FileInputStream fIn;//from   ww w . ja v a 2s . c o  m
    FileOutputStream fOut;
    FileChannel fIChan, fOChan;
    long fSize;
    MappedByteBuffer mBuf;

    fIn = new FileInputStream(args[0]);
    fOut = new FileOutputStream(args[1]);

    fIChan = fIn.getChannel();
    fOChan = fOut.getChannel();
    fSize = fIChan.size();

    mBuf = fIChan.map(FileChannel.MapMode.READ_ONLY, 0, fSize);
    fOChan.write(mBuf); // this copies the file
    fIChan.close();
    fIn.close();

    fOChan.close();
    fOut.close();
}

From source file:Main.java

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

    byte b = 66;/*from  ww w.  j  a  va 2s  .com*/
    int i = 0;
    FileOutputStream fos = new FileOutputStream(FileDescriptor.out);

    fos.write(b);

    fos.flush();

    FileInputStream fis = new FileInputStream("C://test.txt");

    // read till the end of the file
    while ((i = fis.read()) != -1) {
        // convert integer to character
        char c = (char) i;

        System.out.print(c);
    }
    fos.close();
    fis.close();
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    InputStream is = new BufferedInputStream(new FileInputStream("s.gif"));
    Image image = ImageIO.read(is);

    JFrame frame = new JFrame();
    JLabel label = new JLabel(new ImageIcon(image));
    frame.getContentPane().add(label, BorderLayout.CENTER);
    frame.pack();/* w ww. j  av a2  s.c om*/
    frame.setVisible(true);
}

From source file:Main.java

public static void main(String[] args) {

    String s = "from java2s.com!";

    try {// w  w w.  j  a  v a 2s .co  m

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

        FileInputStream in = new FileInputStream("test.txt");

        writer.write(s, 0, 5);

        writer.flush();

        for (int i = 0; i < 5; i++) {
            System.out.print((char) in.read());
        }
        writer.close();
        in.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}