在Java中运行时设置Windows PATH环境变量 [英] set windows PATH environment variable at runtime in Java

问题描述

我有一个使用Runtime.exec（）方法触发可执行文件的java程序。我使用的变体是将一组命令行参数作为一个参数，一些环境变量作为另一个参数。

我尝试设置的环境变量是路径，所以我传递PATH = C：\some\path。这不行。这个或其他任何方法有一些技巧吗？不幸的是我被困在Java 1.4上。

解决方案

使用 http://java.sun.com/j2se/1.4.2/docs/api/java/lang/System .html＃getenv％28java.lang.String％29 获取环境并修复它，然后使用[ http ：//java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html#exec%28java.lang.String,%20java.lang.String []，％20java.io.File ％29] [1] 执行执行。

这个工作与批处理文件中有路径。

  package p; 
 
 import java.util。*; 
 
 public class运行{
 static String [] mapToStringArray（Map< String，String> map）{
 final String [] strings = new String [map.size（）] ; 
 int i = 0; 
 for（Map.Entry< String，String> e：map.entrySet（））{
 strings [i] = e.getKey（）+'='+ e.getValue（）; 
 i ++; 
} 
返回字符串; 
} 
 
 public static void main（String [] arguments）throws Exception {
 final Map< String，String> env = new HashMap< String，String>（System.getenv（））; 
 env.put（Path，env.get（Path）+; foo）; 
 final String [] strings = mapToStringArray（env）; 
 Runtime.getRuntime（）。exec（cmd / C start foo.bat，strings）; 
} 
 
} 
  

I have a java program that fires off an executable using the Runtime.exec() method. I'm using the variant that takes in a set of command line params as one argument, and some environment variables as another argument.

The environment variable I'm tryign to set is path, so i'm passing in "PATH=C:\some\path". This does not work. Is there some trick to this or any alternatives. I am stuck to Java 1.4 unfortunately.

解决方案

use http://java.sun.com/j2se/1.4.2/docs/api/java/lang/System.html#getenv%28java.lang.String%29 to get the environment and fix it up then use a flavour of [http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html#exec%28java.lang.String,%20java.lang.String[],%20java.io.File%29][1] to do the exec.

this works with a batch file that has path in it.

package p;

import java.util.*;

public class Run {
    static String[] mapToStringArray(Map<String, String> map) {
        final String[] strings = new String[map.size()];
        int i = 0;
        for (Map.Entry<String, String> e : map.entrySet()) {
            strings[i] = e.getKey() + '=' + e.getValue();
            i++;
        }
        return strings;
    }

    public static void main(String[] arguments) throws Exception {
        final Map<String, String> env = new HashMap<String, String>(System.getenv());
        env.put("Path", env.get("Path") + ";foo");
        final String[] strings=mapToStringArray(env);
        Runtime.getRuntime().exec("cmd /C start foo.bat",strings);
    }

}

这篇关于在Java中运行时设置Windows PATH环境变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！