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Computer Name using Java

3 replies on 1 page. Most recent reply: Mar 2, 2002 7:15 PM by Charles Bell

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Raj

Posts: 4
Nickname: raj
Registered: Feb, 2002

Computer Name using Java

Posted: Feb 28, 2002 5:26 PM

I would like to find a way in which i can get hold of the computer name using java.

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: Computer Name using Java

Posted: Mar 1, 2002 9:58 AM

To get the current system properties you could do something like the following:

Properties properties = System.getProperties();
properties.list(System.out);

COMPUTERNAME is NOT one of the Properties that you can acess from a statement such as:
System.out.println("COMPUTERNAME: "+ System.getProperty("COMPUTERNAME"));
This will return a null string.

COMPUTERNAME appears to be an operating system specific environment variable.
You can get it by doing a set command and look for the line similar to the following:
COMPUTERNAME=GGN-D9JRNX01

or set COMPUTERNAME gives you just this line

Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: Computer Name using Java

Posted: Mar 1, 2002 10:08 AM

Do you mean "echo %computername%" toward the end of your post (when mentioning how to see one environment variable)?

By the way, this environment variable is not present on Windows 9x/Me systems, so I don't know what the trick would be on those...

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: Computer Name using Java

Posted: Mar 2, 2002 7:15 PM

Yeah you are correct. I was running on a Windows 2000 machine when I wrote that. The computer name environment variable is not shown on the Windows ME machine I am messing with right now.

Machine name probably only applies to Windows NT and 2000 machines.

I wonder if the original question was about finding the IP address instead of the machine name?

Something like the following would do that:

	/**	
	*/
	public String getLocalHostName(){
		String name = "";
		try{
			name =  getHostName(InetAddress.getLocalHost());
		}catch(UnknownHostException unhe){
			System.err.println("Exception: " + unhe.getMessage());		
		}catch (Exception e){
			System.err.println("Exception: " + e.getMessage());		
		}
		return name;
	}
 
	/**	
	*/
	public InetAddress getLocalHostAddress(){
		InetAddress address = null;
		try{
			address = InetAddress.getLocalHost();
		}catch(UnknownHostException unhe){
			System.err.println("Exception: " + unhe.getMessage());		
		}catch(Exception e){
			System.err.println("Exception: " + e.getMessage());		
		}
		return address;		
	}

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