<?xml?version="1.0"?encoding="UTF-8"?>
<web-app?version="3.0"?xmlns="http://java.sun.com/xml/ns/javaee"???
??????xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"???
???????xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
????????http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
</web-app>