JAVA——管道流

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import java.io.*;class Read implements Runnable{    private PipedInputStream in;    Read(PipedInputStream in)    {        this.in = in;    }    public void run()    {        try        {            byte[] buf = new byte[1024];            System.out.println("读取前。。。没有数据阻塞");            int len = in.read(buf);            System.out.println("读到数据。。。阻塞停止");            String s = new String(buf,0,len);            System.out.println(s);            in.close();        }        catch(IOException e)        {            throw new RuntimeException("管道读取流失败！");        }    }}class Write implements Runnable{    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);            out.write("piped lai le".getBytes());            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);        Read r = new Read(in);        Write w = new Write(out);        new Thread(r).start();        new Thread(w).start();    }}

因为有read方法的存在，没有数据就会阻塞。

结果：
读取前。。。没有数据阻塞
开始写入数据，等待6秒后。。。
读到数据。。。阻塞停止
piped lai le

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