IE上载对话框将Office 2007文件误判为ZIP文件流的解决方法（转载）

现象从IIS或者Tomcat之类的Web服务器下载文件时（比如通过设置Header为Content-disposition:inline），如果被下载的文件是Office 2007文档（如后缀名为xlsx、docx、pptx等）时，下载对话框中的图标会变成ZIP。相应的文件名也会成用ZIP为扩展后缀的文件。分析出现这样的情况，是由于IE中对下载文件类型的判断错误造成的。 根据IE设计，假如浏览器找不到相应后缀的MIME，它会自动根据数据流来判断文件的类型。 在Office2007中，微软对其文档的格式做了和以前完全不同的处理。 以前的Office文档是100%的二进制格式，第三方的工具操作起来非常不方便。 而Office 2007以后，Office文档整体上都是基于XML格式的。这里并不是说Office 2007文档可以保存成XML格式，而是Office2007默认的文档格式就是XML的（Word的docx、Excel的xlsx等）。也许有人会感到奇怪，用文本编辑器打开docx后，显示的仍然是二进制格式，为什么 XML？其实docx并不是普通的XML文件，docx本质上是一个ZIP文件，里面有一系列的XML、目录和其他的文件。如果我们将docx改成ZIP，就可以用winzip、7zip等软件将其解开。 正是由于这样的原因，当MIME中不存在相对应的Office 2007类型的情况下，文件会被IE自动识别为ZIP文件。解决办法解决的方法很简单，在Server端添加MIME映射就可以了。 以Tomcat为例，可以在web.xml中找到<mime-mapping></mime-mapping>这样的定义，按照规则添加即可。如： <web-app>...<mime-mapping><extension>.xlsx</extension><mime-type>application/vnd.openxmlformats-officedocument.spreadsheetml.sheet</mime-type></mime-mapping> ...</web-app> 备注： 什么是MIME？MIME（Multipurpose Internet Mail Extensions，多目的Internet邮件扩展）是创建用于电子邮件交换、网络文档、企业网和Internet上的其他应用程序中的文件格式规范。每个MIME格式包含一个MIME内容类型（”MIME type”）和指示存储在这个文件中的数据的子类型。MIME类型和子类型一般以类型/子类型的形式列出。MIME格式的内容广泛用于网络文档中。附录下表收集了大部分文件的扩展名和相应的MIME对应，如有需要，可以在列表中找到相应类型。 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