In Eclipse Kepler it is very easy to generate Web Service Client classes,You can achieve this by following steps .
RightClick on any Project->Create New Other ->Web Services->Web Service Client->Then paste the wsdl url(or location) in Service Definition->Next->Finish
You will see the generated classes are inside your src folder.
NOTE :Without eclipse also you can generate client classes from wsdl file by using wsimport command utility which ships with JDK.
refer this link Create Web service client using wsdl