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InetAddress and Java 1.3

Posted on 2001-08-15
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Last Modified: 2008-02-01
Hi,
I am developing a Applet and i want to get the host name of the computer i an running the applet on.
When i use JApplet.getCodeBase().getHost() I receive localhost instead of the server name.
When i use InetAddress.getLocalHost().getHostName() i get the same.
Any ideas ???
Thanx.
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Question by:rotem_fo
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Expert Comment

by:antons061400
ID: 6389225
probably you download that applet from your PC. (a web server take it from there)
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by:objects
ID: 6390532
Firstly the two thing you are try are different:

JApplet.getCodeBase().getHost()
Returns the host of the server where the applet was loaded.

InetAddress.getLocalHost().getHostName()
Returns the hostname of the client. This information is not accessible to unsigned applets and thus it is returning 'localhost' You need to sign the applet to be able to find the local hostname.
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Author Comment

by:rotem_fo
ID: 6391439
Hi,
I used getCodeBase().getHost() .
Whenever i type the server's name in the address bar (in the internet explorer) i receive the machine name, if i type the ip address the getCodeBase().getHost() returns the ip entered in the address bar.
I am lost :(

R.
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Accepted Solution

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objects earned 200 total points
ID: 6391482
Yes, getHost() returns the host part of the url, which is the ip address if that's what you've entered, or the hostname if you used that.
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by:dviji
dviji earned 200 total points
ID: 6392827
You can get the HostName even you type ipaddress...
By using InetAddress.getByName(String) & InetAddress.getAllByName(String) methods.

i.e
 String hostName = getCodeBase().getHost();
 InetAddress inetAddress = InetAddress.getByName(hostName);
 inetAddress.getHostName();
 inetAddress.getHostAddress();

getByName() method will give you an InetAddress object. The input parameter must be string (if it is ipaddress or name that is not a matter).

Some hosts (most of the popular portals) may have many ipaddress (that is for load balancing) with a single name. In that case you can use getAllByName().

So the better solution is using getAllByName()... it will return an array of InetAddress...From that you can get the values.

ie. Your should looks like..

 String hostName = getCodeBase().getHost();
 InetAddress[] inetAddresses[] = InetAddress.getAllByName(hostName);

 for(int i=0;i<inetAddresses.length;i++)
 {
   inetAddresses[i].getHostName();
   inetAddresses[i].getHostAddress();
 }


...dviji


 

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by:CleanupPing
ID: 9061860
rotem_fo:
This old question needs to be finalized -- accept an answer, split points, or get a refund.  For information on your options, please click here-> http:/help/closing.jsp#1 
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by:Venabili
ID: 9330425
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

- Split points between objects and dviji

Please leave any comments here within the next seven days.
 
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
 
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