如何从Java执行Python脚本？ [英] How to execute Python script from Java?

问题描述

我可以从Java执行Linux命令，如 ls 或 pwd 但没有问题，但无法获得Python脚本执行。

I can execute Linux commands like ls or pwd from Java without problems but couldn't get a Python script executed.

这是我的代码：

Process p;
try{
    System.out.println("SEND");
    String cmd = "/bash/bin -c echo password| python script.py '" + packet.toString() + "'";
    //System.out.println(cmd);
    p = Runtime.getRuntime().exec(cmd); 
    BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
    String s = br.readLine(); 
    System.out.println(s);
    System.out.println("Sent");
    p.waitFor();
    p.destroy();
} catch (Exception e) {}

什么都没发生。它达到SEND但它刚刚停止...

Nothing happened. It reached SEND but it just stopped after it...

我正在尝试执行一个需要root权限的脚本，因为它使用串口。另外，我必须传递带有一些参数（包）的字符串。

I am trying to execute a script which needs root permissions because it uses serial port. Also, I have to pass a string with some parameters (packet).

推荐答案

你不能在<$ c里面使用PIPE $ c> Runtime.getRuntime（）。exec（）就像在你的例子中一样。 PIPE是shell的一部分。

You cannot use the PIPE inside the Runtime.getRuntime().exec() as you do in your example. PIPE is part of the shell.

你可以做任何一次

• 把你的命令shell脚本并使用 .exec（）或



• 执行该shell脚本您可以执行类似于以下

• Put your command to a shell script and execute that shell script with .exec() or

• You can do something similar to the following

String[] cmd = {
        "/bin/bash",
        "-c",
        "echo password | python script.py '" + packet.toString() + "'"
    };
Runtime.getRuntime().exec(cmd);

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