最佳实践 不要使用idea生成的模板,头文件宁愿不要省事,除非知道有什么副作用。

<!--<!DOCTYPE web-app PUBLIC-->
<!--"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"-->
<!--"http://java.sun.com/dtd/web-app_2_3.dtd" >--> 这个默认会把EL表达式 isELIgnored关闭。 正确应该使用
<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">

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