how to get default printer port number in java

Question

i want to access default printer port in java.

also, i want to know that is default printer inkjet, laser, dotmetrix etc. please provide me with reference.

Thanks. Muhammad Babar Nazir Software Engineer

Answer 1

I'm guessing that you are using windows. In such case you can query the windows registry to find the default printer port. All the system information is the Preferences.

import java.util.prefs.Preferences;

....

Preferences userRoot = Preferences.userRoot();
Preferences systemRoot = Preferences.systemRoot();

There is a good article that explain how to do that using pure java:

http://lenkite.blogspot.com/2008/05/access-windows-registry-using-java.html?dzref=85420

Also, you may need to know the key of the default printer in windows:

HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows

Answer 2

Do you actually need the port number ? If you want to print from Java, have you considered the Java Printing APIs ?

The reason that I ask is that you may not have a printer attached directly. You may have a networked printer. The JPA will provide you with a more reliable interface for this.