4、heusertobuildupcontactswithvariousfriendswasstolen.Therefore,alldatatransmittedoverthenetworkneedstobeencryptedtoensuresecurity.Byanalyzingthedemandchatsystemfunctionalityandperformance,theuseofjavatechnology,designandimplementationofjava-basedchatsystem,andbuiltontheEclipseprojectandrun. The
5、overallsystemisdividedintotwomodules:theclientandserver-sidefunctionalmodulesfunctionmodules. Clientisdividedintouserregistration,registereduserlogin,theuser'sfriendsshowchatbetweenusers,addfriends,viewtheuser'sfriendsinformationsixservicemodules. Chatsystemimplementsthefunctionsrequired. Ina