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));
}
}
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