Framework

Framework is a software which provides an abstraction (hiding implementation details) layer over core technologies. Not just that, it also provides additional functionalities. 

 

Framework	Built Over
Struts	Servlets,JSP
Hibernate	JDBC
Spring	Multiple JSE,JEE Technologies

 

Struts Flow

 

            The web.xml file of the application is loaded during the server startup.
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                          Corresponding Servlet i.e ActionServlet is called.
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              It's init ( ) method takes the <init-parameter> to load the struts-config.xml.
                            
                 In web.xml
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                        <init-param>
                                 <param-name>config</param-name>
                                 <param-value>/WEB-INF/struts-config.xml</param-value>
                         </init-param>   
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             ActionServlet calls the process ( ) method of the RequestProcessor class.
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                process ( ) method checks for the appropriate Action class based on the
                            current request and the struts-config.xml file.
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                                Creates/ Recycles Form Bean object.
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                                        Calls reset ( ) method.
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                         Stores Form Bean in the specifies scope. (request/session)
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                      Calls setXxx ( ) (i.e setter methods) on the Form Bean object.
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                                     Calls validate ( ) method. (optional)
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                               Calls execute ( ) method of the Action Class.
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            execute ( ) returns ActionForward object to the RequestProcessor class.
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                     Appropriate view is determined in the struts-config.xml file for the
                                               ActionForward object.




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