importing contacts from gmail,yahoo,msn etc from other services using java/j2ee

I am developing a java/j2ee based web app where I am provide a feature to my web app users, where they will be able to get contacts from the different email providers like yahoo gmail and msn and many other services. Since I am building it on java, I found a open source library which is struts 1.2 based application here is the link http://code.google.com/p/socialauth/ here I have to mention that I am using 开发者_运维知识库Amazon web services simple emailing service to send out emails using there java api's.

I am novice or I dont knw much about the struts, I am trying to figure out how this struts1.2 based app can be integrated with my servlets or aws, sms java api.

Help me out in this regard

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