read jar file variables from a configuration file

Question

I have a java program which uses an external jar file. The jar file has some variables(IP addresses) that needs to be read from a configuration file.

How to I create one such configuration file? How to do I read it in jar? [For now, I have hard-coded the needed variables data in the jar file. But I want to change it as and when I like, so changing in the configuration file is easier and I need not export(or re-compile) my jar file always]

To be more clear:

I have two java files: A.java, B.java. "A.java" is to be exported as a jar file and used by "B.java".

Now, I have to read some data(settings, IP addresses) within A.java. All these sort of data have to kept in a separate file and should be read into A.java. After enabling this, A.java will be exported as a jar file and used by B.java.

How could this be achieved?

Is the external JAR in the classpath of your "java program"? — acdcjunior
– acdcjunior, Commented May 23, 2013 at 4:35
question is not clear....! "how to do I read in in jar" "jar has some variables", etc... — K Adithyan
– K Adithyan, Commented May 23, 2013 at 4:40
A recent related question : stackoverflow.com/questions/16704631/… — Jayan
– Jayan, Commented May 23, 2013 at 4:43
A faced a similar problem ... but I am trying to read from the code also present in the same jar... there... stackoverflow.com/questions/14209107/… was helpful — AurA
– AurA, Commented May 23, 2013 at 4:45

Jayan · Accepted Answer · 2013-05-23 04:42:24Z

There are two different ways. If the jar is part of your classpath, then use Class.getResourceAsStream

It this is from plain jar some where, use JarFile

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