getchannel.java

来自「·TFTPUtil ReadMe For additions, changes,」· Java 代码 · 共 26 行

import java.io.*;
import java.nio.*;
import java.nio.channels.*;
public class GetChannel {
  private static final int BSIZE = 1024;
  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();
    // 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());    
  }
}