java学习笔记:管道流PipedInputStream和PipedOutputStream
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/* 管道流:PipedInputStreamvoid connect(PipedOutputStream src) 使此管道输入流连接到管道输出流 srcPipedOutputStreamvoid connect(PipedInputStream snk) 在JDK我们看到PipedInputStream中有管道缓冲区,用来接收数据管道流内部在实现时还有大量的对同步数据的处理管道输出流和管道输入流执行时不能互相阻塞,所以一般要开启独立线程分别执行顺便复习了多线程操作[示例]:管道流*/import java.io.*;class Demo { public static void main(String[] args) throws Exception { PipedInputStream pin = new PipedInputStream(); PipedOutputStream pout = new PipedOutputStream(); pin.connect(pout); //输入流与输出流连接 ReadThread readTh = new ReadThread(pin); WriteThread writeTh = new WriteThread(pout); new Thread(readTh).start(); new Thread(writeTh).start(); } public static void sop(Object obj) //打印 { System.out.println(obj); }}class ReadThread implements Runnable{ private PipedInputStream pin; ReadThread(PipedInputStream pin) // { this.pin=pin; } public void run() //由于必须要覆盖run方法,所以这里不能抛,只能try { try { sop("R:读取前没有数据,阻塞中...等待数据传过来再输出到控制台..."); byte[] buf = new byte[1024]; int len = pin.read(buf); //read阻塞 sop("R:读取数据成功,阻塞解除..."); String s= new String(buf,0,len); sop(s); //将读取的数据流用字符串以字符串打印出来 pin.close(); } catch(Exception e) { throw new RuntimeException("R:管道读取流失败!"); } } public static void sop(Object obj) //打印 { System.out.println(obj); }}class WriteThread implements Runnable{ private PipedOutputStream pout; WriteThread(PipedOutputStream pout) { this.pout= pout; } public void run() { try { sop("W:开始将数据写入:但等个5秒让我们观察..."); Thread.sleep(5000); //释放cpu执行权5秒 pout.write("W: writePiped 数据...".getBytes()); //管道输出流 pout.close(); } catch(Exception e) { throw new RuntimeException("W:WriteThread写入失败..."); } } public static void sop(Object obj) //打印 { System.out.println(obj); }}编译成功，class文件运行结果: