Java中利用管道实现线程间的通讯

package com.wkcto.pipestream;

import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;

/**
 * 使用PipedInputStream和PipedOutputStream管道字节流在线程之间传递数据
 * 北京极悦老崔
 */
public class Test {
    public static void main(String[] args) throws IOException {
        //定义管道字节流
        PipedInputStream inputStream = new PipedInputStream();
        PipedOutputStream outputStream = new PipedOutputStream();
        //在输入管道流与输出管道流之间建立连接
        inputStream.connect(outputStream);

        //创建线程向管道流中写入数据
        new Thread(new Runnable() {
            @Override
            public void run() {
                writeData(outputStream);
            }
        }).start();

        //定义线程从管道流读取数据
        new Thread(new Runnable() {
            @Override
            public void run() {
                readData(inputStream);
            }
        }).start();
    }

    //定义方法向管道流中写入数据
    public static void writeData(PipedOutputStream out ){
        try {
            //分别把0~100之间的数写入管道中
            for (int i = 0; i < 100; i++) {
                String data = "" + i;
                out.write( data.getBytes() );       //把字节数组写入到输出管道流中
            }
            out.close();            //关闭管道流
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //定义方法从管道流中读取数据
    public static void readData(PipedInputStream in ){
        byte[] bytes = new byte[1024];
        try {
            //从管道输入字节流中读取字节保存到字节数组中
            int len = in.read(bytes);       //返回读到的字节数,如果没有读到任何数据返回-1
            while ( len != -1 ){
                //把bytes数组中从0开始讲到的len个字节转换为字符串打印
                System.out.println( new String(bytes, 0 , len));
                len = in.read(bytes);       //继续从管道中读取数据
            }
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

package com.wkcto.pipestream;

import java.io.IOException;
import java.io.PipedReader;
import java.io.PipedWriter;
import java.io.PrintWriter;

/**
 * PipedReader与PipedWriter字符管道流
 * 北京极悦老崔
 */
public class Test2 {
    public static void main(String[] args) throws IOException {
        //先创建字符管道流
        PipedReader reader = new PipedReader();
        PipedWriter writer = new PipedWriter();
        //在输入管道流与输出管道流之间建立连接
        reader.connect(writer);

        //创建一个线程向管道流中穿入数据
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    for (int i = 0; i < 100; i++) {
                        writer.write(  "data--" + i + "--" +  Math.random() + "\n");
                    }
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
        //开启另外一个 线程从管道流中读取数据
        new Thread(new Runnable() {
            @Override
            public void run() {
                char [] charArray = new char[1024];
                try {
                    int len = reader.read(charArray);
                    while (len != -1 ){
                        System.out.print( String.valueOf(charArray, 0, len));
                        len = reader.read(charArray);
                    }
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}