管道通信原理

PipedInputStream类与PipedOutputStream类用于在应用程序中创建管道通信.一个PipedInputStream实例对象必须和一个PipedOutputStream实例对象进行连接而产生一个通信管道.PipedOutputStream可以向管道中写入数据,PipedIntputStream可以读取PipedOutputStream向管道中写入的数据.这两个类主要用来完成线程之间的通信.一个线程的PipedInputStream对象能够从另外一个线程的PipedOutputStream对象中读取数据.
PipedInputStream与PipedOutputStream类的编程实例(两个线程间进行通信的实例程序)

 

发送者

import java.io.IOException;
import java.io.PipedOutputStream;
import java.util.Scanner;

public class Sender extends Thread {
    private PipedOutputStream out = new PipedOutputStream();

    public PipedOutputStream getOut(){
        return out;
    }
   
    public void run(){
        System.out.println("请输入您要发送的内容：");
        Scanner sc = new Scanner(System.in);
        String comtent = sc.next();
        //String strInfo = new String("Hello,rec");
        try {
            //out.write(strInfo.getBytes());
            out.write(comtent.getBytes());
            out.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            //System.out.println(e);
        }
    }
}

 

接收者

 

import java.io.IOException;
import java.io.PipedInputStream;

public class Receiver extends Thread{
    private PipedInputStream in = new PipedInputStream();

    public PipedInputStream getIn(){
        return in;
    }
   
    public void run(){
        byte [] buf = new byte[1024];
        try {
            int len = in.read(buf);
            System.out.println("the following message comes form sender:/n"
                    +new String(buf,0,len));
            in.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            //System.out.println(e);
        }
    }

}

 

测试程序

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

public class PipedStreamTest {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Sender send = new Sender();
        Receiver receiv = new Receiver();
        PipedOutputStream out = send.getOut();
        PipedInputStream in = receiv.getIn();
        try {
            out.connect(in);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        send.start();
        receiv.start();
    }

}