The lifecycle of ActionForm invoked by the RequestProcessor is as follows:
Retrieve or Create Form Bean associated with Action
"Store" FormBean in appropriate scope (request or session)
Reset the properties of the FormBean
Populate the properties of the FormBean
Validate the properties of the FormBean
Pass FormBean to Action
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How can we make message resources definitions file available to the Struts framework environment?8/26/2008 We can make message resources definitions file (properties file) available to Struts framework environment by adding this file to struts-config.xml. An ActionForm represents an HTML form that the user interacts with over one or more pages. You will provide properties to hold the state of the form with getters and setters to access them. Whereas, using DynaActionForm there is no need of providing properties to hold the state. Instead these properties and their type are declared in the struts-config.xml Exceptions in Struts are handled in two ways: <bean:message>: is used to retrive keyed values from resource bundle. It also supports the ability to include parameters that can be substituted for defined placeholders in the retrieved string. <html:errors/> tag displays all the errors. <html:errors/> iterates over ActionErrors request attribute. The various Struts tag libraries are: A specialized subclass of ActionForm that allows the creation of form beans with dynamic sets of properties (configured in configuration file), without requiring the developer to create a Java class for each type of form bean. In this case the global forward is not used. Instead the <action> element’s <forward> takes precendence. The SwitchAction class provides a means to switch from a resource in one module to another resource in a different module. SwitchAction is useful only if you have multiple modules in your Struts application. The SwitchAction class can be used as is, without extending. |
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