管道流

//管道流


import java.io.*;


class  Read implements Runnable // 读，加入多线程技术
{
private PipedInputStream in;// 一初始化时有管道进来
Read(PipedInputStream in)
{
this.in = in;
}
public void run()//覆盖run方法
{
try //覆盖run方法，只能try
{
byte[] buf = new byte[1024];


System.out.println("读取前。。没有数据，阻塞");
int len = in.read(buf); // 等 写完再执行
System.out.print("读到数据。。阻塞结束");


String s = new String(buf,0,len);


System.out.println(s); //管道流里读到的数据


in.close();
}
catch (IOException e)
{
throw new RuntimeException("管道读取流失败");
}
}
}


class Write implements Runnable // 读，加入多线程技术
{
private PipedOutputStream out;
Write(PipedOutputStream out)
{
this.out = out;
}
public void run()
{
try
{
System.out.println("开始写入数据，等待6秒后");
Thread.sleep(6000); //抛另外的异常，所以下面要改IOE
out.write("Piped lai le".getBytes());//字节流
out.close();
}
catch (Exception e)
{
throw new RuntimeException("管道输出流失败");
}

}
}


class PipedStreamDemo
{
public static void main(String[] args) throws IOException
{
PipedInputStream in = new PipedInputStream();
PipedOutputStream out = new PipedOutputStream();
in.connect(out); //使此管道输入流连接到管道输出流.


Read r = new Read(in);
Write w = new Write(out);


new Thread(r).start();
new Thread(w).start();


}
}