通过管道流进行线程间的通信 淩亂°似流年 2022-05-13 11:06 147阅读 0赞 一.概述 1).在Java语言中提供了各种各样的输入/输出流Stream,使我们能够方便地对数据进行操作,其中管道流(pipeStream)是一种特殊的流,用于在不同线程间直接传递数据。一个线程发送数据到输出管道,另一个线程从输出管道中读取数据。通过使用管道,实现不同线程间的通信,而无须借助类似临时文件之类的东西。 2).在Java的JDK中提供了4个类来使线程间可以进行通信: a.PipedInputStream和PipedOutputStream(字节流) b.PipedReader和PipedWriter(字符流) 二.代码(字节流案例) package org.zhq.pipeStream; import java.io.PipedOutputStream; /** * @author 作者 hq.zheng: * @version 创建时间:2018-9-12 下午2:21:35 * 类说明: 写入数据到内存 */ public class WriteData { public void writeMethod(PipedOutputStream out){ try { System.out.println("write:"); for(int i=0;i<300;i++){ String outData=""+(i+1); out.write(outData.getBytes()); System.out.print(outData); } System.out.println(); out.close(); } catch (Exception e) { e.printStackTrace(); } } } package org.zhq.pipeStream; import java.io.PipedInputStream; /** * @author 作者 hq.zheng: * @version 创建时间:2018-9-12 下午2:26:27 * 类说明: 从内存里读数据 */ public class ReadData { public void ReadMethod(PipedInputStream input){ try { System.out.println("read :"); byte[] byteArray=new byte[20]; int readLength=input.read(byteArray); while(readLength!=-1){ String newData=new String(byteArray,0,readLength); System.out.print(newData); readLength=input.read(byteArray); } System.out.println(); input.close(); } catch (Exception e) { e.printStackTrace(); } } } package org.zhq.pipeStream; import java.io.PipedOutputStream; /** * @author 作者 hq.zheng: * @version 创建时间:2018-9-12 下午2:34:33 * 类说明: 写数据线程 */ public class ThreadWrite extends Thread { private WriteData write; private PipedOutputStream out; public ThreadWrite(WriteData write,PipedOutputStream out){ super(); this.write=write; this.out=out; } @Override public void run(){ write.writeMethod(out); } } package org.zhq.pipeStream; import java.io.PipedInputStream; /** * @author 作者 hq.zheng: * @version 创建时间:2018-9-12 下午2:38:10 * 类说明: 读数据线程 */ public class ThreadRead extends Thread { private ReadData read; private PipedInputStream input; public ThreadRead(ReadData read,PipedInputStream input){ super(); this.read=read; this.input=input; } @Override public void run(){ read.ReadMethod(input); } } package org.zhq.pipeStream; import java.io.PipedInputStream; import java.io.PipedOutputStream; /** * @author 作者 hq.zheng: * @version 创建时间:2018-9-12 下午2:45:37 * 类说明 :测试运行 */ public class Run { public static void main(String[] args) { try { WriteData writeData=new WriteData(); ReadData readData=new ReadData(); PipedInputStream inputStream=new PipedInputStream(); PipedOutputStream outputStream=new PipedOutputStream(); outputStream.connect(inputStream); ThreadRead threadRead=new ThreadRead(readData, inputStream); threadRead.start(); Thread.sleep(2000); ThreadWrite threadWrite=new ThreadWrite(writeData, outputStream); threadWrite.start(); } catch (Exception e) { e.printStackTrace(); } } } 三.结果 ![70][] 首先是读取读取线程先启动,由于没有数据,所以阻塞在in.read(byteArray),直到有数据被写入,才继续向下运行。 [70]: /images/20220513/f4ac611d9e4f48d8a9a81af1510b4e11.png
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