管道流PipedInputStream与PipedOutputStream操作实例

package test.run;

/*
管道流:
PipedInputStream
void connect(PipedOutputStream src)
使此管道输入流连接到管道输出流 src

PipedOutputStream
void 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.PipedInputStream;
import java.io.PipedOutputStream;

class Run {
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;
}

@Override
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("输出数据");
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;
}

@Override
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);
}
}