Mediator 設計模式
摘要: 這個模式一直沒有好好的理解。最近作IM 相關的應用，才明白了。
就是兩個人之間要溝通，不是直接，而是通過 mediator.
也就是 ,不是
user1.sendMessage(user2，"some message");
而是
user1.getMediator().sendMessage("user2","some message");
有什么好處呢：
職責分離：mediator 完成自己該承擔的職責。
mediator 也可以搞這搞那。
插一段實際代碼：
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推薦一篇 StAX and WoodStox 的介紹文章，英文
摘要:
StAX the odds with Woodstox
剛讀了，感覺不錯。
Over a decade into XML evolution, however, these parsing technologies are slowly showing their age, requiring bypasses and optimizations to overcome their well-known limitations. StAX, or Streaming API for XML, is the new-age XML parser that offers the best features of the existing models, and at the same time provides high performance and efficient access to the underlyi
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