📄 uml建模图（chipchat）.mdl
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|线程类CATCHER,该类实现对登陆信息端口的监听,以及识别各类与登陆相关的数据包的类别的识别.
|并在收到要求应答的数据包的时候发送一个包含请求端用户名以及本机IP的数据包到组播组,此数
|据包由所有在线的终端接受,但只有用户名与包中包含用户名相同的终端对其予以显示,以此方法来
|实现对后来登陆的终端告知已经在线的用户.
|当请求应答的终端用户名与本程序用户重名时作出必要判断,实现不在本机显示重复的登陆信息.
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|run()实现对组播端口的监听,并作出反映
|
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|Connect()方法实现了对对方回应本机信息的过程，其中第一以及最后一个为无用的信息，在接收方被吸收掉
|
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|在应用程序的登陆信息框中显示信息
|
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