如何在Windows上的Java应用程序中设置/更新PATH变量? [英] How can I set/update PATH variable from within java application on Windows?

问题描述

等效于此命令行的内容:

Something equivalent to this command line:

set PATH=%PATH%;C:\Something\bin

要运行我的应用程序，必须在PATH变量中添加一些内容.因此，我想在程序开始时捕获异常，如果程序无法启动，并显示一些向导供用户选择需要放在PATH中的程序的安装文件夹.我将使用该文件夹的绝对路径，并将其添加到PATH变量中，然后再次启动我的应用程序.

To run my application, some thing has to be in a PATH variable. So I want at the program beginning catch exceptions if program fails to start and display some wizard for user to select the installation folder of a program that needs to be in a PATH. The I would took that folder's absolute path and add it to the PATH variable and start my application again.

编辑:

那个东西"是VLC播放器.我需要PATH变量中的安装文件夹(例如:C:\ Program Files \ VideoLAN \ VLC).我的应用程序是单个可执行.jar文件，为了使用它，VLC必须位于PATH中.因此，当用户首次启动我的应用程序时，该小向导将弹出以选择VLC文件夹，然后我将使用它更新PATH.

That "something" is VLC player. I need it's installation folder in PATH variable (for example: C:\Program Files\VideoLAN\VLC). My application is single executable .jar file and in order to use it, VLC needs to be in a PATH. So when the user first starts my app, that little wizard would pop up to select the VLC folder and then I would update PATH with it.

推荐答案

您可以使用Process对象执行命令，也可以使用BufferedReader读取命令的输出，这是一个快速的示例，可以帮助您退出:

You can execute commands using the Process object, you can also read the output of that using a BufferedReader, here's a quick example that may help you out:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String args[]) {
        try {
            Process proc = Runtime.getRuntime().exec("cmd set PATH=%PATH%;C:\\Something\\bin");
            proc.waitFor();
            BufferedReader reader = new BufferedReader(new InputStreamReader(proc.getInputStream()));

            String line = reader.readLine();
            while (line != null) {
                //Handle what you want it to do here
                line = reader.readLine();
            }
        } 
        catch (IOException e1) { 
            //Handle your exception here
        }
        catch(InterruptedException e2) {
            //Handle your exception here
        }

        System.out.println("Path has been changed");
    }
}

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