Java“尾-f"包装纸 [英] Java "tail -f" wrapper

问题描述

我需要将 Unix 命令tail -f"包装在 BufferedInputStream 中.我不想模拟或模仿 this question.相反，我想使用 tail，等待它给我换行.

I need to wrap the Unix command "tail -f" in a BufferedInputStream. I don't want to simulate or mimic tail as stated by this question. Rather, I want to use tail, waiting for it to give me a new line.

推荐答案

最好的办法是使用 Process 类并用 Scanner 阅读:

Your best bet is to use the Process class and read with a Scanner:

Runtime r = Runtime.getRuntime()
Process p = r.exec("tail -f")
Scanner s = new Scanner(p.getInputStream())
while (s.hasNextLine()) {
    String line = s.nextLine()
    // Do whatever you want with the output.
}

hasNextLine() 应该阻塞，因为它正在等待来自输入流的更多输入，因此您不会因为数据进入而忙于等待.

hasNextLine() should block as it's waiting for more input from the input stream, so you will not be busy-waiting as data comes in.

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