Using Windows Environment Variables in Java

[stevensteven]

Hello,

In my java code, I would like to store a windows environment variable into a variable I use in my java code. Is there a built in call for this?

Thanks for any help,

Steven

 

[sedj]

No, because Java is OS independant.Why do you need to do this ? There are probably neater ways of getting around the problem ...

 

[stevensteven]

I need a certain windows environment variable to use in my java program.

I can get it at the command prompt by typing "SET userdomian" to get my required information.

 

[sedj]

If you really must (though I would advise finding another way around your problem), you could use this code :

Process p = Runtime.getRuntime().exec("set userdomain");
int exitStatus = p.waitFor();
if (exitStatus != 0) {
  throw new IOException("Process exited with error");
}

InputStream is = p.getInputStream();
// The read your IO stream as you would any other stream

 

[idarke]

If you set the jvm to pass them through to you, you can read environment variables as System properties.

Try this:

http://www.rgagnon.com/javadetails/java-0150.html

 

[sedj]

Of course, as idarke says you can pass variables to the JVM via "java -Dmy.var=%MY_VAR%" , but I don't believe this is what the guy wanted ... could be wrong ?!!

 

[stevensteven]

No, this is great! Thanks guys!

Steve

 

[JavaDude32]

I thought System.getProperty() (or something like that) worked in general for Environment Variables as the JVM is still compiled for each platform??

 

[sedj]

System.getProperty() will retrieve variables that are set with a "-D" switch, and also standard JVM properties such as "java.endorsed.dirs", but these have nothing to do with OS level environment variables.