java - 我可以通过代码设置环境变量吗？

This question already has answers here:

How do I set environment variables from Java?

(19个回答)


6年前关闭。




我正在尝试安装apche tomcat。需要设置环境变量，如何设置环境变量？

我尝试使用ProcessBuilder，但不起作用:

ProcessBuilder pb = new ProcessBuilder("CMD.exe", "/C", "SET"); // SET prints out the environment variables
pb.redirectErrorStream(true);
Map<String,String> env = pb.environment();
String path = env.get("CATALINA_HOME") + apachePath;
env.put("CATALINA_HOME", path);
Process process = null;
try {
    process = pb.start();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

最佳答案

示例在这里:

import java.io.*;
import java.util.*;

public class Test
{
    public static void main(String[] args) throws Exception
    {
        ProcessBuilder pb = new ProcessBuilder("CMD.exe", "/C", "SET"); // SET prints out the environment variables
        pb.redirectErrorStream(true);
        Map<String,String> env = pb.environment();
        String path = env.get("Path") + ";C:\\naved\\bin";
        env.put("Path", path);
        Process process = pb.start();
        BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line;
        while ((line = in.readLine()) != null)
        {
            System.out.println(line);
        }
    }
}