struts1的parameter

1、配置文件    parameter="method"

2、请求路径      http://localhost:8081/purchaseDeclareAction.do?method=edit&。。。。。。。。

3、public abstract class DispatchAction extends BaseAction

// --------------------------------------------------------- Public Methods

/**
    * Process the specified HTTP request, and create the corresponding HTTP
    * response (or forward to another web component that will create it).
    * Return an <code>ActionForward</code> instance describing where and how
    * control should be forwarded, or <code>null</code> if the response has
    * already been completed.
    *
    * @param mapping  The ActionMapping used to select this instance
    * @param form     The optional ActionForm bean for this request (if any)
    * @param request  The HTTP request we are processing
    * @param response The HTTP response we are creating
    * @return The forward to which control should be transferred, or
    *         <code>null</code> if the response has been completed.
    * @throws Exception if an exception occurs
    */
   public ActionForward execute(ActionMapping mapping, ActionForm form,
       HttpServletRequest request, HttpServletResponse response)
       throws Exception {
       if (isCancelled(request)) {
           ActionForward af = cancelled(mapping, form, request, response);

if (af != null) {
               return af;
           }
       }

// Get the parameter. This could be overridden in subclasses.
       String parameter = getParameter(mapping, form, request, response);

// Get the method's name. This could be overridden in subclasses.
       String name =
           getMethodName(mapping, form, request, response, parameter);

// Prevent recursive calls
       if ("execute".equals(name) || "perform".equals(name)) {
           String message =
               messages.getMessage("dispatch.recursive", mapping.getPath());

log.error(message);
           throw new ServletException(message);
       }

// Invoke the named method, and return the result
       return dispatchMethod(mapping, form, request, response, name);
   }