16.5管道流

管道流的主要作用是可以進行兩個線程間的通訊，分爲管道輸出流（PipedOutputStream、PipedWriter）、管道輸入流（PipedInputStream、PipedReader）

• 【PipedOutputStream】管道連接：public void connect(PipedInputStream snk) throws IOException
• 【PipedWriter】管道連接：public void connect​(PipedReader snk) throws IOException
  管道流（字節流）
  
  管道流（字符流）
  
  範例：使用字節管道流實現線程通信

package com.lxh.sixteenchapter;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;

public class JavaIODemo420 {
       public static void main(String[] args) throws IOException {
    	   SendThread  send=new SendThread();
    	   ReceiveThread receive=new ReceiveThread();
    	   send.getOutput().connect(receive.getInput());//管道連接
    	   new Thread(send,"消息發送線程").start();
    	   new Thread(receive,"消息接收線程").start();
	}
}

class SendThread implements Runnable{     //發送消息線程
   private PipedOutputStream output;
   
	public PipedOutputStream getOutput() {
	return output;
}

public void setOutput(PipedOutputStream output) {
	this.output = output;
}
	public SendThread() {
	this.output = new  PipedOutputStream();
}
	@Override
	public void run() {
		try {
			this.output.write("您好？請問需要幫助嗎？".getBytes());
		} catch (IOException e) {
			
			e.printStackTrace();
		}finally {
			if(output!=null) {
				try {
					output.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		
	}
	
}

class ReceiveThread implements Runnable{   //接收信息線程數據

	private PipedInputStream input;
	
	public ReceiveThread() {
	
	this.input =new PipedInputStream();
}

	public PipedInputStream getInput() {
		return input;
	}

	public void setInput(PipedInputStream input) {
		this.input = input;
	}

	@Override
	public void run() {
		byte[] data=new byte[1024];
		int len=0;
		ByteArrayOutputStream bos=new ByteArrayOutputStream();
		try {
			while((len=input.read(data))!=-1) {
				bos.write(data,0,len);
			}
			System.out.println(new String(bos.toByteArray()));
		} catch (IOException e) {
		
			e.printStackTrace();
		}finally {
			if(input!=null) {
				try {
					input.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		
	}
	
}

執行結果

您好？請問需要幫助嗎？