java.nio.channels.Pipe使用例子

Java.nio.channels.Pipe 提供一種機制，可以按照寫入的順序讀取數據。 Pipe.SinkChannel用來向管道寫入數據，而Pipe.SourceChannel用來從管道讀取數據：

PipeTest.java

package cn.outofmemory.nio.channels;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Pipe;

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

      //初始化Pipe實例
      Pipe pipe = Pipe.open();

      // 獲取寫通道
      Pipe.SinkChannel skChannel = pipe.sink();

      String testData = "Test Data to Check java NIO Channels Pipe.";

      ByteBuffer buffer = ByteBuffer.allocate(512);
      buffer.clear();
      buffer.put(testData.getBytes());

      buffer.flip();
       //向寫通道寫入數據
      while(buffer.hasRemaining()) {
          skChannel.write(buffer);
      }
      //獲得讀取數據通道
      Pipe.SourceChannel sourceChannel = pipe.source();
      buffer = ByteBuffer.allocate(512);

     //將讀取數據寫到控制臺     
      while(sourceChannel.read(buffer) > 0){

          //flip方法將當前讀取位置設置為0， limit設置為寫入數據的size
         buffer.flip();

          while(buffer.hasRemaining()){
              char ch = (char) buffer.get();
              System.out.print(ch);
          }

          //clear方法將buffer的limit設置為其容量capacity， 將position設置為0
          buffer.clear();
      }

  }
}

輸出如下：

Test Data to Check java NIO Channels Pipe.