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Struts处理用户表单请求的核心源代码：
摘要: Struts处理用户表单请求的核心源代码： Struts处理用户表单请求的核心源代码 Struts处理用户表单请求的核心源代码： ====================== ActionSer...
Struts处理用户表单请求的核心源代码 Struts处理用户表单请求的核心源代码： ====================== ActionServlet ================================ /** * 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); } /** * 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); } /** * Perform the standard request processing for this request, and create * the corresponding response. * * @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 is thrown */ protected void process(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { RequestUtils.selectModule(request, getServletContext()); getRequestProcessor(getModuleConfig(request)).process (request, response); } __________________________________________________________________________ /** * Look up and return the {@link RequestProcessor} responsible for the * specified module, creating a new one if necessary. * * @param config The module configuration for which to * acquire and return a RequestProcessor. * * @exception ServletException if we cannot instantiate a RequestProcessor * instance * @since Struts 1.1 */ protected synchronized RequestProcessor getRequestProcessor(ModuleConfig config) throws ServletException { String key = Globals.REQUEST_PROCESSOR_KEY + config.getPrefix(); RequestProcessor processor = (RequestProcessor) getServletContext().getAttribute(key); if (processor == null) { try { processor = (RequestProcessor) RequestUtils.applicationInstance( config.getControllerConfig().getProcessorClass()); } catch (Exception e) { throw new UnavailableException( "Cannot initialize RequestProcessor of class " + config.getControllerConfig().getProcessorClass() + ": " + e); } processor.init(this, config); getServletContext().setAttribute(key, processor); } return (processor); } ======================= RequestProcessor =========================== -------------------------------- RequestProcessor ------------------------------------------------------ /** * <p>Process an <code>HttpServletRequest</code> and create the * corresponding <code>HttpServletResponse</code>.</p> * * @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 processing exception occurs */ public void process(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { // Wrap multipart requests with a special wrapper request = processMultipart(request); // Identify the path component we will use to select a mapping String path = processPath(request, response); if (path == null) { return; } if (log.isDebugEnabled()) { log.debug("Processing a '" + request.getMethod() + "' for path '" + path + "'"); } // Select a Locale for the current user if requested processLocale(request, response); // Set the content type and no-caching headers if requested processContent(request, response); processNoCache(request, response); // General purpose preprocessing hook if (!processPreprocess(request, response)) { return; } // Identify the mapping for this request ActionMapping mapping = processMapping(request, response, path); if (mapping == null) { return; } // Check for any role required to perform this action if (!processRoles(request, response, mapping)) { return; } // Process any ActionForm bean related to this request ActionForm form = processActionForm(request, response, mapping); processPopulate(request, response, form, mapping); if (!processValidate(request, response, form, mapping)) { return; } // Process a forward or include specified by this mapping if (!processForward(request, response, mapping)) { return; } if (!processInclude(request, response, mapping)) { return; } // Create or acquire the Action instance to process this request Action action = processActionCreate(request, response, mapping); if (action == null) { return; } // Call the Action instance itself ActionForward forward = processActionPerform(request, response, action, form, mapping); // Process the returned ActionForward instance processForwardConfig(request, response, forward); } ------------------------------------- RequestProcessor. -------------------------------------------------- /** * Ask the specified <code>Action</code> instance to handle this * request. Return the <code>ActionForward</code> instance (if any) * returned by the called <code>Action</code> for further processing. * * @param request The servlet request we are processing * @param response The servlet response we are creating * @param action The Action instance to be used * @param form The ActionForm instance to pass to this Action * @param mapping The ActionMapping instance to pass to this Action * * @exception IOException if an input/output error occurs * @exception ServletException if a servlet exception occurs */ protected ActionForward processActionPerform(HttpServletRequest request, HttpServletResponse response, Action action, ActionForm form, ActionMapping mapping) throws IOException, ServletException { try { return (action.execute(mapping, form, request, response)); } catch (Exception e) { return (processException(request, response, e, form, mapping)); } } |