String newData = "New String to write to file..." + System.currentTimeMillis();
ByteBuffer buf = ByteBuffer.allocate(48);
buf.clear();
buf.put(newData.getBytes());
buf.flip();
while(buf.hasRemaining()) {
 sinkChannel.write(buf);
}

package com.test.nio;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Pipe;
public class TestPipeA {
 /** 
   * @param args 
   * @throws Exception 
   */
 public static void main(String[] args) throws Exception {
  //创建一个管道 
  Pipe pipe=Pipe.open();
  //创建一个写管道 
  Pipe.SinkChannel sinkChannel=pipe.sink();
  String newData="itbuluoge.com says:"+System.currentTimeMillis();
  ByteBuffer buf=ByteBuffer.allocate(48);
  buf.clear();
  buf.put(newData.getBytes());
  buf.flip();
  /*向管道写入内容*/
  while(buf.hasRemaining()) 
      {
   sinkChannel.write(buf);
  }
  /*创建一个读管道*/
  Pipe.SourceChannel sourceChannel=pipe.source();
  ByteBuffer getBuf=ByteBuffer.allocate(48);
  int bytesRead=sourceChannel.read(getBuf);
  getBuf.flip();
  /*从管道读出内容*/
  while(getBuf.hasRemaining()) 
      {
   System.out.print((char)getBuf.get());
  }
 }
}