Java中的InputStream的多个读者 [英] Multiple readers for InputStream in Java

问题描述

我有一个InputStream，我正在读取字符。我希望多个读者访问此InputStream。似乎一种合理的方法是将传入的数据写入StringBuffer或StringBuilder，并让多个读者读取它。不幸的是，不推荐使用StringBufferInputStream。 StringReader读取一个字符串，而不是一个不断更新的可变对象。我有什么选择？写我自己的？

I have an InputStream from which I'm reading characters. I would like multiple readers to access this InputStream. It seems that a reasonable way to achieve this is to write incoming data to a StringBuffer or StringBuilder, and have the multiple readers read that. Unfortunately, StringBufferInputStream is deprecated. StringReader reads a string, not a mutable object that's continuously being updated. What are my options? Write my own?

推荐答案

输入流的工作原理如下：一旦你读了它的一部分，就会永远消失。你不能回去重读它。你可以做的是这样的：

Input stream work like this: once you read a portion from it, it's gone forever. You can't go back and re-read it. what you could do is something like this:

class InputStreamSplitter {
  InputStreamSplitter(InputStream toReadFrom) {
    this.reader = new InputStreamReader(toReadFrom);
  }
  void addListener(Listener l) {
    this.listeners.add(l);
  }
  void work() {
    String line = this.reader.readLine();
        while(line != null) {
      for(Listener l : this.listeners) {
        l.processLine(line);
      }
    }
  }
}

interface Listener {
  processLine(String line);
}

让所有感兴趣的人都实现Listener并将它们添加到InputStreamSplitter

have all interested parties implement Listener and add them to InputStreamSplitter

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