vip21-javaweb/day12/web/WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">


<filter>
    <filter-name>JSPFilter</filter-name>
    <filter-class>com.lovecoding.filter.JSPFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>JSPFilter</filter-name>
    <url-pattern>/admin.jsp</url-pattern>
</filter-mapping>


<!--  我们可以在web.xml里面定义 Filter 对象  -->
<filter>
    <filter-name>Demo</filter-name>
    <filter-class>com.lovecoding.filter.MyFilter</filter-class>
</filter>
<!--  这里定义一个URL匹配 讲匹配上的 请求转给Filter 处理  -->
<filter-mapping>
    <filter-name>Demo</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<!--  只匹配JSP过滤  -->
<filter-mapping>
    <filter-name>Demo</filter-name>
    <url-pattern>*.jsp</url-pattern>
</filter-mapping>

<!--  只匹配JSP过滤  -->
<filter-mapping>
    <filter-name>Demo</filter-name>
    <url-pattern>/index.jsp</url-pattern>
</filter-mapping>

<!--  只匹配JSP过滤  -->
<filter-mapping>
    <filter-name>Demo</filter-name>
    <url-pattern>/admin/*</url-pattern>
</filter-mapping>


</web-app>