web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="http://java.sun.com/xml/ns/javaee"
        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                            http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
        id="WebApp_ID"
        version="3.0">


    <filter>
        <filter-name>helloFilter</filter-name>
        <filter-class>com.chenlm.demo.HelloFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>helloFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <servlet>
        <servlet-name>hello</servlet-name>
        <servlet-class>com.chenlm.demo.HelloServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>helloJsp</servlet-name>
        <servlet-class>com.chenlm.demo.HelloJspServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>hello</servlet-name>
        <url-pattern>/hello</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>helloJsp</servlet-name>
        <url-pattern>/hellojsp</url-pattern>
    </servlet-mapping>

</web-app>