JavaMailHotmail
相信许多人都有MSN聊天工具的帐号，例如abc@hotmail.com ，这个账号其实也是一个邮件地址，可以进行正常的邮件收发功能，你可以通过网址 http://www.hotmail.com 来访问和操作这个邮箱进行邮件的收发。但是这个邮箱有一个限制就是它并不提供POP3或者SMTP服务，也就是说一般的邮件客户端工具无法使用这个邮箱，虽然现在有不少的邮件工具可以支持Hotmail邮箱，但是如果我们需要在我们的Java项目中增加对Hotmail邮箱的支持，那往往会不知从什么地方开始入手，因为SUN公司提供的JavaMail 本身并不提供对除了POP3/IMAP以及SMTP外其他协议的支持。
但事实上，JavaMail只是定义了一组平台无关、独立于通讯协议的邮件程序框架，或者说是接口，它是作为Java的可选包存在的。因此可以这样说：JavaMail并不关心所使用的协议，不管是POP3、SMTP、IMAP当然还有Hotmail用的HTTP协议。对于JavaMail的客户端而言也是这样的，下图就是一个最简单的JavaMail结构图，通过Transport进行邮件的发送，通过Store实现对邮件的收取，而不同协议的实现，JavaMail里的概念叫做Provider，只需要根据JavaMail定义的接口实现自己的Provider即可。
为了实现通过JavaMail访问Hotmail邮箱，我们就需要架起JavaMail接口与Hotmail服务所提供的访问接口之间的桥梁。在这之前我们必须首先了解Hotmail所使用的接口协议。
Hotmail通过地址 http://services.msn.com/svcs/hotmail/httpmail.asp 提供基于HTTP协议的服务，它不同于我们通过浏览器访问 http://www.hotmail.com 的这个地址，后面这个地址是提供给用户一个基于浏览器的访问界面以便对邮箱进行操作，你当然可以通过编写HTTP客户端程序来解析页面并获取邮件的信息，但是这样做不仅实现的复杂程度非常高，而且每次页面风格发生变化后程序都要做相应的调整，因此不具备通用性，显然是不可行的。而地址 http://services.msn.com/svcs/hotmail/httpmail.asp 则不同，它提供了固定的应用程序接口。当你使用浏览器访问该地址的时候，会弹出下面要求登录的窗体：
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