Java管道流实现线程间通信过程解析

Z时代
2024-01-10
分类：综合

管道流

在Java语言中提供了各种各样的输入/输出流 Stream ，使我们能够很方便地对数据进行操作，其中管道流是一种特殊的流，用于在不同线程间直接传送数据。一个线程发送数据到输出管道流，另一个线程从输入管道流中读取数据。

通过使用管道，实现不同线程间的通信，而无须借助于类似临时文件之类的东西。

字节流

PipedInputStream 和 PipedOutputStream

字符流

PipedReader 和 PipedWriter

示例


public class PipeStreamTest {
  public static void main(String[] args) throws IOException, InterruptedException {
    WriteData writeData = new WriteData();
    ReadData readData = new ReadData();
    PipedReader reader = new PipedReader();
    PipedWriter writer = new PipedWriter();
    writer.connect(reader);
    new Thread(() -> {
      writeData.writeMethod(writer);
    }).start();
    Thread.sleep(2000);
    new Thread(() -> {
      readData.readMethod(reader);
    }).start();
  }
  static class WriteData {
    public void writeMethod(PipedWriter writer) {
      try {
        System.out.println("write :");
        for (int i = 0; i < 300; i++) {
          String outData = "" + (i + 1);
          writer.write(outData);
          System.out.print(outData);
        }
        System.out.println();
        writer.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
  static class ReadData {
    public void readMethod(PipedReader reader) {
      try {
        System.out.println("read :");
        char[] byteArray = new char[20];
        int readLength = reader.read(byteArray);
        while (readLength != -1) {
          String newData = new String(byteArray, 0, readLength);
          System.out.print(newData);
          readLength = reader.read(byteArray);
        }
        System.out.println();
        reader.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
}