担任MVC/Model 2控制器角色核心的是ActionServlet.ActionServlet必须在web.xml里进行配置。具体配置参数参见“web.xml参数设置.doc”Servlet容器在启动时，或者用户首次请求ActionServlet时加载ActionServlet类，在上述情况下，Servlet容器都会在ActionServlet被加载后立即执行它的init()方法。具体的init()方法代码解读参见“ActionServlet的init()方法.doc”。可以继承ActionServlet来定义自己的控制器，通常的目的是重新定义ActionServlet的init()方法，增加自己的初始化动作：定义如下的类： import sample;public class ExtendedActionServlet extends ActionServlet {         public void init() throws ServletException {                super.init();                //加入自己的代码                ……………         } } 扩展完类后，还应该在web.xml文件中如下配置： <servlet>         <servlet-name>sample</servlet-name>         <servlet-class>sample.ExtendedActionServlet</servlet-class> </servlet> <servlet-mapping>        <servlet-name>sample</servlet-name>        <url-pattern>/ *.do<url-pattern> <servlet-mapping>客户端的所有请求都必须先通过ActionServlet，在Struts 1.1中，有关于请求的处理大部份已交由RequestProcessor，当ActionServlet收到GET或POST的请求，其doGet() 或doPost()会呼叫process()方法来处理请求：ActionServlet的doGet()方法：    /**     * Process an HTTP "GET" request.     *     * @param request The servlet request we are processing     * @param response The servlet response we are creating     *     * @exception IOException if an input/output error occurs     * @exception ServletException if a servlet exception occurs     */    public void doGet(HttpServletRequest request,              HttpServletResponse response)        throws IOException, ServletException {         process(request, response);     } ActionServlet的doPost()方法：    /**     * Process an HTTP "POST" request.     *     * @param request The servlet request we are processing     * @param response The servlet response we are creating     *     * @exception IOException if an input/output error occurs     * @exception ServletException if a servlet exception occurs     */    public void doPost(HttpServletRequest request,               HttpServletResponse response)        throws IOException, ServletException {        process(request, response);    }ActionServlet的process()方法：protected void process(HttpServletRequest request,                             HttpServletResponse response)throws IOException, ServletException {    //取得请求路径以选择应用程序模块来处理请求    RequestUtils.selectApplication(request, getServletContext());    /* getApplicationConfig(request)获得Applicationconfig对象    * Applicationconfig对象调用getProcessor()方法获得RequestProcessor对象    * RequestProcessor对象调用process()方法处理请求,具体的方法代码参见“RequestProcessor的process()方法.doc”    */    getApplicationConfig(request).getProcessor().process(request, response);}您可以继承RequestProcessor，并改写其中的processXXXXX()方法来自定义请求的处理方式 如果您要使用自己的 RequestProcessor，要要在struts-config.xml中使用<controller>标签来定义，例如：struts-config.xml中：<controller    contentType="text/html;charset=GB2312"   nocache="true"    processorClass="onlyfun.caterpillar.CustomRequestProcessor"/>struts-config.xml:

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