• 管道輸入/輸出流可以用于線程之間的數(shù)據(jù)傳輸，傳輸媒介為內(nèi)存
• 有四種實(shí)現(xiàn)：PipedOutputStream，PipedInputStream，PipedReader和PipedWriter，前兩種面向字節(jié)，后兩種面向字符
  代碼示例：

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

/**
 * @author pengjunzhe
 */
public class Piped {
    public static void main(String[] args) throws IOException {
        PipedWriter out = new PipedWriter();
        PipedReader in = new PipedReader();
        // 將輸入流和輸出流連接
        out.connect(in);
        Thread printThread = new Thread(new Print(in), "PrintThread");
        printThread.start();
        int receive = 0;
        try {
            while ((receive = System.in.read()) != -1) {
                out.write(receive);
            }
        } finally {
            out.close();
        }
    }

    static class Print implements Runnable {

        private PipedReader in;

        public Print(PipedReader in) {
            this.in = in;
        }

        @Override
        public void run() {
            int receive = 0;
            try {
                while ((receive = in.read()) != -1) {
                    System.out.print((char) receive);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

運(yùn)行結(jié)果：

111
111

• 對于Piped類型的流，需要先進(jìn)行板頂，也就是調(diào)用connect()方法，不然對流的訪問會(huì)拋出異常。