如何通过某些用户输入退出连续的while循环？ [英] How do I exit a continuous while loop by some user input?

问题描述

我对Java很陌生。我正在从URL中读取输入，该URL为我提供了实时的文本流。我想不断地将它写入一个文本文件，所以每次URL给出一个新的字符串我都把它添加到一个字符串缓冲区，在我的无限循环之外我把缓冲区的内容写到我的文件中。麻烦的是，我需要一种退出while循环的方法，因为服务器永远不会停止向我提供数据，所以我想做一些事情，比如在控制台中输入0以退出while循环并将内容写入文件。在那个问题上，有人知道我的StringBuffer类的对象是否会达到存储限制吗？

I'm pretty new to Java. I'm currently reading input from a URL which provides me with a real-time stream of text. I want to continually write this to a text file, so every time the URL gives a new string I add this to a string buffer, outside of my infinite while loop I write the contents of the buffer to my file. The trouble is, I need a way of exiting the while loop because the server never stops giving me data, so I want to do something such as enter 0 in the console to exit the while loop and write the contents to a file. On that subject, does anybody know if my object of the StringBuffer class will reach a storage limit?

推荐答案

循环不应该写到内存缓冲区，但直接到文件编写器（包装在BufferedWriter中）。这样可以避免内存不足。

The loop should not write to an in-memory buffer, but to the file writer directly (wrapped inside a BufferedWriter). This will avoid running out of memory.

你应该启动一个执行你的while循环的新线程，并在每次迭代时测试是否要求线程自行中断，使用 Thread.currentThread（）。isInterrupted（）。一旦中断，线程应该停止while循环，并关闭writer。

You should start a new thread which executes your while loop, and tests at each iteration if the thread has been asked to interrupt itself, using Thread.currentThread().isInterrupted(). Once interrupted, the thread should stop the while loop, and close the writer.

从命令行读取主线程，并在输入stop命令时调用编写器线程上的 interrupt（）。

Have your main thread read from the command line, and when the stop command is entered, call interrupt() on the writer thread.

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