利用filechannel拷贝文件内容

package com.itbuluoge.nio;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class GetChannel {

  /**
   * @param args
   * @throws Exception 
   */
  public static void main(String[] args) throws Exception {

    /*文件内容拷贝*/
    FileChannel fca=new FileInputStream("data.txt").getChannel();
    FileChannel fcb=new FileOutputStream("back.txt").getChannel();
    
    ByteBuffer swap=ByteBuffer.allocate(1000);
    fca.read(swap);
    while(swap.hasRemaining())
    {
      swap.flip();
      /*写入到新文件*/
      fcb.write(swap);
    }
  }

}