Example usage for java.io File File

Introduction

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

Prototype

public File(URI uri)

Source Link

Document

Creates a new File instance by converting the given file: URI into an abstract pathname.

Usage

From source file:MainClass.java

public static void main(String[] args) {
    File aFile = new File("afile.txt");
    FileOutputStream outputFile = null;
    try {/*  ww  w  .  jav  a2s . com*/
        outputFile = new FileOutputStream(aFile, true);
        System.out.println("File stream created successfully.");
    } catch (FileNotFoundException e) {
        e.printStackTrace(System.err);
    }
    ByteBuffer buf = ByteBuffer.allocate(1024);
    System.out.println("\nByte buffer:");
    System.out.printf("position = %2d  Limit = %4d  capacity = %4d%n", buf.position(), buf.limit(),
            buf.capacity());

    // Create a view buffer
    CharBuffer charBuf = buf.asCharBuffer();
    System.out.println("Char view buffer:");
    System.out.printf("position = %2d  Limit = %4d  capacity = %4d%n", charBuf.position(), charBuf.limit(),
            charBuf.capacity());
    try {
        outputFile.close(); // Close the O/P stream & the channel
    } catch (IOException e) {
        e.printStackTrace(System.err);
    }
}

From source file:Main.java

public static void main(String[] args) throws java.io.IOException {
    BufferedImage img = ImageIO.read(new File("input-image.png"));

    BufferedImage rotated = new AffineTransformOp(
            AffineTransform.getQuadrantRotateInstance(3, img.getWidth() / 2, img.getHeight() / 2),
            AffineTransformOp.TYPE_BILINEAR).filter(img, null);

    ImageIO.write(rotated, "PNG", new File("output-image.png"));
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    // Create a read/writeable file channel
    File file = new File("filename");
    FileChannel channel = new RandomAccessFile(file, "rw").getChannel();

    OutputStream os = Channels.newOutputStream(channel);
    os.close();//from w w w.ja  va 2s .co m
}

From source file:MyClass.java

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

    URL[] urls = null;//from   w ww.j a  va 2 s. c o  m

    File dir = new File(System.getProperty("user.dir") + File.separator + "dir" + File.separator);
    URL url = dir.toURI().toURL();
    urls = new URL[] { url };

    ClassLoader cl = new URLClassLoader(urls);

    Class cls = cl.loadClass("MyClass");

    MyClass myObj = (MyClass) cls.newInstance();

}

From source file:FileFilterDemo.java

public static void main(String[] args) {
    JFileChooser chooser = new JFileChooser();
    chooser.setCurrentDirectory(new File("."));

    chooser.setFileFilter(new javax.swing.filechooser.FileFilter() {
        public boolean accept(File f) {
            return f.getName().toLowerCase().endsWith(".gif") || f.isDirectory();
        }//from www . j a  v  a 2  s  . c  o m

        public String getDescription() {
            return "GIF Images";
        }
    });

    int r = chooser.showOpenDialog(new JFrame());
    if (r == JFileChooser.APPROVE_OPTION) {
        String name = chooser.getSelectedFile().getName();
        System.out.println(name);
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    // Create a read/writeable file channel
    File file = new File("filename");
    FileChannel channel = new RandomAccessFile(file, "rw").getChannel();

    InputStream is = Channels.newInputStream(channel);

    // Close the channel
    is.close();//  ww w  . j  a va  2  s.c o m
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    ZipFile zip = new ZipFile(new File("sample.zip"));

    for (Enumeration e = zip.entries(); e.hasMoreElements();) {
        ZipEntry entry = (ZipEntry) e.nextElement();
        System.out.println("File name: " + entry.getName() + "; size: " + entry.getSize()
                + "; compressed size: " + entry.getCompressedSize());
        InputStream is = zip.getInputStream(entry);
        InputStreamReader isr = new InputStreamReader(is);

        char[] buffer = new char[1024];
        while (isr.read(buffer, 0, buffer.length) != -1) {
            String s = new String(buffer);
            System.out.println(s.trim());
        }//from w  w  w .jav  a  2  s.  c  o m
    }
}

From source file:Main.java

public static void main(String[] args) throws IOException {
    BufferedImage image = ImageIO.read(new File("E:/Java_Dev/plasma.gif"));

    // crop image
    BufferedImage firstHalf = image.getSubimage(0, 0, (image.getWidth() / 2), image.getHeight());
    BufferedImage secondHalf = image.getSubimage(image.getWidth() / 2, 0, image.getWidth() / 2,
            image.getHeight());//from www.j av  a  2  s.  co  m

    File croppedFile1 = new File("E:/Java_Dev/half1.png");
    File croppedFile2 = new File("E:/Java_Dev/half2.png");

    ImageIO.write(firstHalf, "png", croppedFile1);
    ImageIO.write(secondHalf, "png", croppedFile2);

    // join image
    BufferedImage joined = new BufferedImage(image.getWidth(), image.getHeight(), image.getType());
    BufferedImage image1 = ImageIO.read(new File("E:/Java_Dev/half1.png"));
    BufferedImage image2 = ImageIO.read(new File("E:/Java_Dev/half2.png"));

    Graphics2D graph = joined.createGraphics();
    graph.drawImage(image1, 0, 0, null);
    graph.drawImage(image2, image1.getWidth(), 0, null);

    File joinedFile = new File("E:/Java_Dev/joined.png");
    ImageIO.write(joined, "png", joinedFile);
}

From source file:Main.java

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

    AudioInputStream stream = AudioSystem.getAudioInputStream(new File("audiofile"));
}

From source file:MainClass.java

public static void main(String[] args) {
    File aFile = new File("C:/test.bin");
    FileInputStream inFile = null;
    try {//from   ww  w . java 2  s. co m
        inFile = new FileInputStream(aFile);
    } catch (FileNotFoundException e) {
        e.printStackTrace(System.err);
    }
    FileChannel inChannel = inFile.getChannel();
    final int PRIMECOUNT = 6;
    ByteBuffer buf = ByteBuffer.allocate(8 * PRIMECOUNT);
    long[] primes = new long[PRIMECOUNT];
    try {
        while (inChannel.read(buf) != -1) {
            ((ByteBuffer) (buf.flip())).asLongBuffer().get(primes);
            for (long prime : primes) {
                System.out.printf("%10d", prime);
            }
            buf.clear();
        }
        inFile.close();
    } catch (IOException e) {
        e.printStackTrace(System.err);
    }
}