不同版本(2.3,2.4,2.5,3.0)的Servlet web.xml 头信息

学习了：https://blog.csdn.net/z69183787/article/details/36008097

2.5

<?xml version="1.0" encoding="UTF-8"?>
<web-app  version="2.5"

        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_2_5.xsd">  

</web-app>  

3.0

<?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>  

原文地址：https://www.cnblogs.com/stono/p/9256809.html