Open source MVC framework will be a very good page on the separation of business logic, the use of a three-tier system of thinking

struts源码
..........\org
..........\...\apache
..........\...\......\struts
..........\...\......\......\action
..........\...\......\......\......\Action.java
..........\...\......\......\......\ActionErrors.java
..........\...\......\......\......\ActionForm.java
..........\...\......\......\......\ActionFormBean.java
..........\...\......\......\......\ActionForward.java
..........\...\......\......\......\ActionMapping.java
..........\...\......\......\......\ActionMessage.java
..........\...\......\......\......\ActionMessages.java
..........\...\......\......\......\ActionRedirect.java
..........\...\......\......\......\ActionResources.properties
..........\...\......\......\......\ActionResources_ja.properties
..........\...\......\......\......\ActionServlet.java
..........\...\......\......\......\ActionServletWrapper.java
..........\...\......\......\......\doc-files

..........\...\......\......\......\DynaActionForm.java
..........\...\......\......\......\DynaActionFormClass.java
..........\...\......\......\......\ExceptionHandler.java
..........\...\......\......\......\ForwardingActionForward.java
..........\...\......\......\......\InvalidCancelException.java
..........\...\......\......\......\LocalStrings.properties
..........\...\......\......\......\LocalStrings_ja.properties
..........\...\......\......\......\package.html
..........\...\......\......\......\PlugIn.java
..........\...\......\......\......\RedirectingActionForward.java
..........\...\......\......\......\RequestActionMapping.java
..........\...\......\......\......\RequestProcessor.java
..........\...\......\......\......\SessionActionMapping.java
..........\...\......\......\chain
..........\...\......\......\.....\commands
..........\...\......\......\.....\........\AbstractAuthorizeAction.java
..........\...\......\......\.....\........\AbstractCreateAction.java
..........\...\......\......\.....\........\AbstractExceptionHandler.java
..........\...\......\......\.....\........\AbstractExecuteAction.java
..........\...\......\......\.....\........\AbstractPerformForward.java
..........\...\......\......\.....\........\AbstractPerformInclude.java
..........\...\......\......\.....\........\AbstractPopulateActionForm.java
..........\...\......\......\.....\........\AbstractRequestNoCache.java
..........\...\......\......\.....\........\AbstractSelectAction.java
..........\...\......\......\.....\........\AbstractSelectForward.java
..........\...\......\......\.....\........\AbstractSelectInput.java
..........\...\......\......\.....\........\AbstractSelectLocale.java
..........\...\......\......\.....\........\AbstractSelectModule.java
..........\...\......\......\.....\........\AbstractSetContentType.java
..........\...\......\......\.....\........\AbstractSetOriginalURI.java
..........\...\......\......\.....\........\AbstractValidateActionForm.java
..........\...\......\......\.....\........\ActionCommand.java
..........\...\......\......\.....\........\ActionCommandBase.java
..........\...\......\......\.....\........\CacheMessages.java
..........\...\......\......\.....\........\CreateActionForm.java
..........\...\......\......\.....\........\ExceptionCatcher.java
..........\...\......\......\.....\........\ExecuteCommand.java
..........\...\......\......\.....\........\ExecuteForwardCommand.java
..........\...\......\......\.....\........\generic
..........\...\......\......\.....\........\.......\CopyFormToContext.java
..........\...\......\......\.....\........\.......\package.html
..........\...\......\......\.....\........\.......\WrappingLookupCommand.java
..........\...\......\......\.....\........\InvalidPathException.java
..........\...\......\......\.....\........\package.html
..........\...\......\......\.....\........\RemoveCachedMessages.java
..........\...\......\......\.....\........\SelectInclude.java
..........\...\......\......\.....\........\servlet
..........\...\......\......\.....\........\.......\ActionPostProcess.java
..........\...\......\......\.....\........\.......\AuthorizeAction.java
..........\

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