java管道通信

介绍:不同的数据源之间通过建立管道进行数据通信。如图：

线程之间通信最好的方式就是采用管道机制，类似水管一样，水管可以对接，组合成各种具有过滤性质的管道，管道和线程灵活使用，可以提高效率。（Channel）信道复用机制。
class Recever implements Runnable {

		PipedInputStream inputStream;

		Recever(PipedInputStream inputStream) {
			this.inputStream = inputStream;
		}

		@Override
		public void run() {
			try {
				while (true) {
					byte[] buffers = new byte[512];
					int len = inputStream.read(buffers);

					String s = new String(buffers, 0, len);
					System.out.println("收到:" + s);
				}

				// inputStream.close();
			} catch (Exception e) {

			}
		}

	}

　　

class Sender implements Runnable {

		PipedOutputStream outputStream;

		Sender(PipedOutputStream outputStream) {
			this.outputStream = outputStream;
		}

		@Override
		public void run() {

			try {
				Scanner scanner = new Scanner(System.in);
				while (scanner.hasNext()) {
					String msg = scanner.nextLine();
					outputStream.write(msg.getBytes());
					outputStream.flush();
				}

			} catch (Exception e) {
				e.printStackTrace();
			}
		}

	}

　　

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

		PipedInputStream in = new PipedInputStream();
		PipedOutputStream out = new PipedOutputStream();

		in.connect(out);
		new Thread(new Recever(in)).start();
		new Thread(new Sender(out)).start();
	}

　　

//数据流的合并-读取几个文件的内容输入到下一个文件
InputStream in1 = new FileInputStream("c:/a1.txt");
InputStream in2 = new FileInputStream("c:/a2.txt");
InputStream in3 = new FileInputStream("c:/a3.txt"); 

Vector<InputStream> inputStreams = new  Vector<InputStream>();
inputStreams.add(in1);
inputStreams.add(in2);
inputStreams.add(in3);

Enumeration<? extends InputStream> enumeration = inputStreams.elements();
SequenceInputStream inputStream = new SequenceInputStream(enumeration );

		OutputStream os = new FileOutputStream("c:/a4.txt");
		byte[] buffer = new byte[512];
		int length = -1;
		while((length = inputStream.read(buffer))!=-1){
			os.write(buffer, 0, length);
			os.flush();
		}
		os.close();
		inputStream.close();

//内存读取
ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
arrayOutputStream.write("test".getBytes());
arrayOutputStream.flush();

byte[] buffer = arrayOutputStream.toByteArray();
ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(buffer );