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通过管道进行线程间通信 * 在Java语言中提供了各种各样的输入/输出流Stream,使我们能够狠方便地对数据进行操作,其中管道 流式一种特殊的流,用于在不同线程间直接传输数据。一个线程发送数据到输出管道,另一个线程 从输入管道中读数据。通过使用管道,实现不同线程间的通信。 * 在java的JDK中提供了4个类来使线程间可以进行通信 1. PipedInputStream和PipedOutputStream 2. PipedReader和PipedWriter 1. 字节流 * 举个栗子 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 (IOException e){ e.printStackTrace(); } } } 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 (IOException e){ e.printStackTrace(); } } } 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); } } 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); } } 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 (IOException e){ e.printStackTrace(); }catch (InterruptedException e){ e.printStackTrace(); } } } 注释:outputStream.connect(inputStream)的作用使两个Stream之间产生通信链接。 在没有数据被写入是,int readLength=in.read(byteArray)处于阻塞状态,直到 有数据被写入,才继续向下运行。 2. 字符流 * 举个栗子 public class WriteData { public void writeMethod(PipedWriter out){ try{ System.out.println("write :"); for(int i=0;i<300;i++){ String outData=""+(i+1); out.write(outData); System.out.print(outData); } System.out.println(); out.close(); }catch (IOException e){ e.printStackTrace(); } } } public class ReadData { public void readMethod(PipedReader input){ try{ System.out.println("read :"); char[] byteArray=new char[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 (IOException e){ e.printStackTrace(); } } } public class ThreadWrite extends Thread{ private WriteData write; private PipedWriter out; public ThreadWrite(WriteData write,PipedWriter out){ super(); this.write=write; this.out=out; } @Override public void run() { write.writeMethod(out); } } public class ThreadRead extends Thread{ private ReadData read; private PipedReader input; public ThreadRead(ReadData read,PipedReader input){ super(); this.read=read; this.input=input; } @Override public void run() { read.readMethod(input); } } public class Run { public static void main(String[] args){ try{ WriteData writeData=new WriteData(); ReadData readData=new ReadData(); PipedReader inputStream=new PipedReader(); PipedWriter outputStream=new PipedWriter(); outputStream.connect(inputStream); ThreadRead threadRead=new ThreadRead(readData,inputStream); threadRead.start(); Thread.sleep(2000); ThreadWrite threadWrite=new ThreadWrite(writeData,outputStream); threadWrite.start(); }catch (IOException e){ e.printStackTrace(); }catch (InterruptedException e){ e.printStackTrace(); } } } * 和字节流类似,就是输入输出会更加方便。转载地址:http://bmjqi.baihongyu.com/