Java read operating system environment variables

Variable Java read operating system environment variable








/**


FileName: Sysprob.java


Description: Gets the program for the current system variable. The System.getproperty in Java is for the JVM only, and the system-related functions are used if you want to obtain system environment variables


Author: Ci Qin Qiang


email:cqq1978@gmail.com


**/











import java.util.*;


import java.io.*;








class Sysprob


{


//Returns the current system variable's function, the result is placed in a properties inside, here only for Win2K above, other systems can improve themselves


public Properties GetEnv () throws Exception


{


Properties Prop=new properties ();


String OS = System.getproperty ("Os.name"). toLowerCase ();


Process P=null;


if (Os.indexof ("Windows") >-1)


{


p=runtime.getruntime (). EXEC ("cmd/c set"); Other operating systems can be handled by themselves, I'm here Win2K


}


BufferedReader br=new BufferedReader (New InputStreamReader (P.getinputstream ()));


String Line;


while ((Line=br.readline ())!=null)


{


int I=line.indexof ("=");


if (i>-1)


{


String key=line.substring (0,i);


String value=line.substring (i+1);


Prop.setproperty (Key,value);


}


}


return prop;


}





//Specific usage


public static void Main (string[] args)


{


Try


{


sysprob sp=new sysprob ();


Properties p=sp.getenv ();


System.out.println (P.getproperty ("Path")); Note that case, if you write path, it's not right.


}


catch (Exception e)


{


System.out.println (e);


}





}


}