当你从Struts网站下载下来Struts的压缩包之后，解压，然后在src目录下，搜索web.xml即可！

在web.xml中复制如下代码即可！

<filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>