Example usage for java.nio.channels FileChannel write

Introduction

In this page you can find the example usage for java.nio.channels FileChannel write.

Prototype

public final long write(ByteBuffer[] srcs) throws IOException

Source Link

Document

Writes a sequence of bytes to this channel from the given buffers.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    FileChannel fc = new FileOutputStream("data.txt").getChannel();
    fc.write(ByteBuffer.wrap("Some text ".getBytes()));
    fc.close();/* w w  w  . j  ava2s  .c om*/
}

From source file:MainClass.java

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

    if (args.length < 2) {
        System.err.println("Usage: java MainClass inFile1 inFile2... outFile");
        return;//ww w .  j  a va  2 s .co  m
    }

    ByteBuffer[] buffers = new ByteBuffer[args.length - 1];
    for (int i = 0; i < args.length - 1; i++) {
        RandomAccessFile raf = new RandomAccessFile(args[i], "r");
        FileChannel channel = raf.getChannel();
        buffers[i] = channel.map(FileChannel.MapMode.READ_ONLY, 0, raf.length());
    }

    FileOutputStream outFile = new FileOutputStream(args[args.length - 1]);
    FileChannel out = outFile.getChannel();
    out.write(buffers);
    out.close();
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    FileChannel fc = new FileOutputStream("data2.txt").getChannel();
    fc.write(ByteBuffer.wrap("Some text".getBytes("UTF-16BE")));
    fc.close();/*from   w  ww .  ja  v  a  2s.c o  m*/
    ByteBuffer buff = ByteBuffer.allocate(BSIZE);
    // Now try reading again:
    fc = new FileInputStream("data2.txt").getChannel();
    buff.clear();
    fc.read(buff);
    buff.flip();
    System.out.println(buff.asCharBuffer());

}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ByteBuffer bbuf = ByteBuffer.allocate(100);
    File file = new File("filename");

    boolean append = false;

    FileChannel wChannel = new FileOutputStream(file, append).getChannel();

    wChannel.write(bbuf);

    wChannel.close();//from  w  w  w  .j a v  a 2  s . co m
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    FileChannel fc = new FileOutputStream("data2.txt").getChannel();
    fc.write(ByteBuffer.wrap("Some text".getBytes()));
    fc.close();//w w w.  j a  va 2 s . c  o  m
    fc = new FileInputStream("data2.txt").getChannel();
    ByteBuffer buff = ByteBuffer.allocate(BSIZE);
    fc.read(buff);
    buff.flip();

    System.out.println(buff.asCharBuffer());
    // Decode using this system's default Charset:
    buff.rewind();
    String encoding = System.getProperty("file.encoding");
    System.out.println("Decoded using " + encoding + ": " + Charset.forName(encoding).decode(buff));
    // Or, we could encode with something that will print:
    fc = new FileOutputStream("data2.txt").getChannel();
    fc.write(ByteBuffer.wrap("Some text".getBytes("UTF-16BE")));
    fc.close();

}

From source file:GetChannel.java

public static void main(String[] args) throws Exception {
    // Write a file:
    FileChannel fc = new FileOutputStream("data.txt").getChannel();
    fc.write(ByteBuffer.wrap("Some text ".getBytes()));
    fc.close();//from   w  w w . java  2 s  . co  m
    // Add to the end of the file:
    fc = new RandomAccessFile("data.txt", "rw").getChannel();
    fc.position(fc.size()); // Move to the end
    fc.write(ByteBuffer.wrap("Some more".getBytes()));
    fc.close();
    // Read the file:
    fc = new FileInputStream("data.txt").getChannel();
    ByteBuffer buff = ByteBuffer.allocate(BSIZE);
    fc.read(buff);
    buff.flip();
    while (buff.hasRemaining())
        System.out.print((char) buff.get());
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    FileChannel fc = new RandomAccessFile("data.txt", "rw").getChannel();
    fc.position(fc.size());//w ww  .j a v a 2  s .  c om
    fc.write(ByteBuffer.wrap("Some more".getBytes()));
    fc.close();

}

From source file:BufferToText.java

public static void main(String[] args) throws Exception {
    FileChannel fc = new FileOutputStream("data2.txt").getChannel();
    fc.write(ByteBuffer.wrap("Some text".getBytes()));
    fc.close();//from w  ww  .  j  av a2  s  . c o m
    fc = new FileInputStream("data2.txt").getChannel();
    ByteBuffer buff = ByteBuffer.allocate(BSIZE);
    fc.read(buff);
    buff.flip();
    // Doesn't work:
    System.out.println(buff.asCharBuffer());
    // Decode using this system's default Charset:
    buff.rewind();
    String encoding = System.getProperty("file.encoding");
    System.out.println("Decoded using " + encoding + ": " + Charset.forName(encoding).decode(buff));
    // Or, we could encode with something that will print:
    fc = new FileOutputStream("data2.txt").getChannel();
    fc.write(ByteBuffer.wrap("Some text".getBytes("UTF-16BE")));
    fc.close();
    // Now try reading again:
    fc = new FileInputStream("data2.txt").getChannel();
    buff.clear();
    fc.read(buff);
    buff.flip();
    System.out.println(buff.asCharBuffer());
    // Use a CharBuffer to write through:
    fc = new FileOutputStream("data2.txt").getChannel();
    buff = ByteBuffer.allocate(24); // More than needed
    buff.asCharBuffer().put("Some text");
    fc.write(buff);
    fc.close();
    // Read and display:
    fc = new FileInputStream("data2.txt").getChannel();
    buff.clear();
    fc.read(buff);
    buff.flip();
    System.out.println(buff.asCharBuffer());
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    FileChannel fc = new FileOutputStream("data2.txt").getChannel();
    ByteBuffer buff = ByteBuffer.allocate(24); // More than needed
    buff.asCharBuffer().put("Some text");
    fc.write(buff);
    fc.close();/*from  w w  w  . j a  v a  2s  . c  om*/

    fc = new FileInputStream("data2.txt").getChannel();
    buff.clear();
    fc.read(buff);
    buff.flip();
    System.out.println(buff.asCharBuffer());

}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    String fromFileName = args[0];
    String toFileName = args[1];//from   w w  w .  j a va2s  .  co  m
    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();
}