mime-mapping元素将mime类型映射到扩展名。

<!ELEMENT mime-mapping (extension, mime-type)>

<!ELEMENT extension (#PCDATA)>

<!ELEMENT mime-type (#PCDATA)>

extension元素用来描述扩展名。mime-type元素则为MIME类型。

举个例子，下面的部署描述符将扩展名txt映射为text/plain：

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app

PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

<mime-mapping>

<extension>txt</extension>

<mime-type>text/plain</mime-type>

</mime-mapping>

</web-app>