<?xml version="1.1" encoding="UTF-8"?><web-app 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" ????????version="3.0">
servlet3.0 web.xml 标头
原文地址：https://www.cnblogs.com/Mike_Chang/p/10058170.html