can we create an war file in eclipse3.1 version with out taking the help of dos? if it is possible to create an war file plz tell me the procedure how to create it?

what's "dos"?
AFAIK plain Eclipse can't do this. A war file is the web-achieve of J2EE.. you'll need to install some plug-in that supports development/creation of of web-achieves..
One such would be a licensed "IBM Rational Application Developer" or RAD.. once you install it, it installs required plug-ins for eclipse..

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