在java中读取进程的实时输出

问题描述

我使用

Process p = Runtime.getRuntime().exec("python script.py");

此脚本循环运行，仅被事件(或用户交互)取消.脚本在每个循环周期写入输出，一些文本如12:22:35 -- Heartbeat"

This script runs in a loop and is only canceled by an event (or user interaction). The script writes to the output every loop cycle, some text like "12:22:35 -- Heartbeat"

while True:
  print("Heartbeat")
  time.sleep(1)

在我的 Java 应用程序中，我想读取出现的输出.我的问题是，如果我使用 BufferReader，它会等到进程完成，然后读取输出.我是这样读的:

In my Java application I want to read this output as it appears. My problem is, if I use the BufferReader, it will wait until the process is completed and after that it reads the output. Here is how I read it:

BufferedReader is = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;

while ((line = is.readLine()) != null)
   System.out.println(line);

如何读取实时"输出?

为了更好地理解:python-script 监听硬件按钮，当按下这个按钮时，会写出一些输出.在我的 Java 应用程序中，我想显示此消息并将其发送给某些客户端.

For better understanding: the python-script listen on a hardware button, and when this button is pressed, some output is written out. And in my java application I want to show up this message and sent it to some clients.

推荐答案

使用 https://github.com/zeroturnaround/zt-exec

new ProcessExecutor().command("python", "script.py")
    .redirectOutput(new LogOutputStream() {
        @Override
        protected void processLine(String line) {
            ...
        }
    })
    .execute();

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