java学习笔记 管道流

管道流

管道流主要作用是可以连接两个线程间的通信。管道流也分为字节流（PipedInputStream、PipedOutputStream）与字符流（PipedReader、PipedWriter）两种类型.

一个PipedInputStream 对象必须和一个PipedOutputStream 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，PipedInputStream 可以从管道中读取 PipedOutputStream 写入的数据。

管道实现线程间通信图解

代码实例：

Sender类：
import java.io.IOException;
import java.io.PipedOutputStream;
 
public class Sender extends Thread
 {
 private PipedOutputStream out =null;
 public PipedOutputStream getOutputStream()
   {
        this.out=new PipedOutputStream();
   return out;         
   }
 
public void run()
    {
        String s = new String("Receiver,你好！");
         try {
                 out.write( s.getBytes() );
                 out.close();
          } catch (IOException e)
           {
                System.out.println( e.getMessage() );
           } 
   }
}
Eeceiver类：
import java.io.IOException;
import java.io.PipedInputStream;
public class Eeceiver extends Thread {
       privatePipedInputStream in = new PipedInputStream();
       publicPipedInputStream getinputStream()
       {
         return in;   
       }
 
       publicvoid run ( )
       {
         String s = null;
         byte [] buf = new byte[1024];
          try {
                      int len = in.read( buf );
                             s= new String( buf,0,len);
                             System.out.println("收到了一下消息："+s);
                             in.close();
          } catch (IOException e) {
                 System.out.println( e.getMessage() );
               }
       }
}
 
Pipedemo 类：
import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
 
public class pipedemo {
 
       publicstatic void main( String args[])
         {
              try{
                     Sendersender = new Sender();
                    
                     Eeceiverreceiver = new Eeceiver();
                     PipedOutputStreamout = sender.getOutputStream();
                     PipedInputStreamin = receiver.getinputStream();
                     out.connect(in);
                     sender.start();
                     receiver.start();
                   } catch (IOException e) {
                     System.out.println(e.getMessage() );
                 }
             
         }
}