021.14 IO流 管道流

用的频率不高
特点：读取管道和写入管道对接，需要是用多线程技术，单线程容易死锁

使用connect方法连接两个流，实现边读编写，和node.js的管道流差不多

//##主函数位置
public static void main(String[] args) throws IOException
{
    //创建两个管道对象
    PipedInputStream pis = new PipedInputStream();
    PipedOutputStream pos = new PipedOutputStream();

    //将两个管道连接上
    pis.connect(pos);

    new Thread(new Input(pis)).start();;
    new Thread(new Output(pos)).start();
}

//定义输入任务
class Input implements Runnable{
    private PipedInputStream pis;

    public Input(PipedInputStream pis) {
        super();
        this.pis = pis;
    }

    @Override
    public void run()
    {
        byte[] buf = new byte[1024];
        int len = 0;
        try {
            len = pis.read(buf);
            String messege = new String(buf,0,len);
            System.out.println(messege);
            pis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

//定义输出任务
class Output implements Runnable{
    private PipedOutputStream pos;

    public Output(PipedOutputStream pos) {
        super();
        this.pos = pos;
    }

    @Override
    public void run()
    {
        try {
            pos.write("hei,我很想你".getBytes());
            pos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}