web.xml 版本必须是2.4以上的版本
<web-app version="2.4"
?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_4.xsd">???
?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_4.xsd">???
?
?<jsp-property-group>
??<url-pattern>/legacy/*.jsp</url-pattern>
??<el-ignored>false</el-ignored>
?</jsp-property-group>
??<url-pattern>/legacy/*.jsp</url-pattern>
??<el-ignored>false</el-ignored>
?</jsp-property-group>
?
<%@ page isELIgnored="false" %>
添加这三个就可以了