REVOLUTION TO NEXT GENERATION Struts2.0 20/02/ Avishek Arang ::

Topics discussed …  Basic features of struts2.0.  Struts2 vs struts1.1.  Architecture of struts2.0.  Basic flow of struts2.0.  How to configure the plugins for struts2 in netbeans IDE.  Some basic components in brief.  Reference 20/02/ Avishek Arang ::

 Page-based Navigation  Built-in Ajax Support: DWR and Dojo  Spring as default inversion of control container  Changed from front-controller servlet to filter  Much better client-side validation support  QuickStart and Annotations  JSF Support  Built-in support for testing with StrutsTestCase Features 20/02/ Avishek Arang ::

Struts2.0 Struts1.1  Action  Action or POJO  Result  struts.xml  FilterDispatcher  Interceptors  Action-validation.xml  Action  ActionForm  ActionForward  struts-config.xml  ActionServlet  RequestProcessor  validation.xml Comparison 20/02/ Avishek Arang ::

Architecture 20/02/2009 Avishek Arang :: 5

 User Sends request.  FilterDispatcher determines the appropriate action.  Interceptors are applied.  Execution of Action.  Output rendering.  Return of Request(reverse order).  Display the result to user. Avishek Arang :: 20/02/ Flow of Struts 2 based Application

Select Tools > Plugins: To configure struts plugins to netbeans IDE. 20/02/ Avishek Arang ::

Configure Plugins: org-netbeans-modules- web-frameworks- struts2.nbm org-netbeans-modules- web-frameworks- struts2lib20011.nbm 20/02/ Avishek Arang ::

 Struts 2 Core components are Action handler, Result Handler and Custom Tags.  Action handler Action handler interacts with other layers.  Result Handler Result handler actually dispatches the request to view.  Custom Tags Custom Tags are used render the dynamic content.  Interceptors The Interceptors are used to specify the "request-processing lifecycle" for an action. Interceptors are configured to apply the common functionalities like workflow, validation etc.. to the request. Interceptors code is executed before and after an Action is invoked  Expression Language(ONGL- Object Graph Notation Language) Avishek Arang :: 20/02/ Struts 2 Core components

/pages/defects.jsp /pages/editDefect.jsp list.action Avishek Arang :: 20/02/ struts.xml

 Used to modularize application.  Always a child of tag.  Only attribute “file” implies the config file.   Order of including files are important.  explicitly include: “struts-default.xml” and the “struts-plugin.xml” files Avishek Arang :: 20/02/

 name - unique.  extends - “struts-default”.  namespace- admin, knowledgecenter, test.  Abstract-if “true” actions configured will not be accessible via the package name. Avishek Arang :: 20/02/

 They provide a way to supply pre-processing and post-processing around the action.  examples include exception handling, file uploading, lifecycle callbacks and validation. view.jsp Avishek Arang :: 20/02/ Interceptor

 Field Summary  static String ERROR The action execution was a failure.StringERROR  static String INPUT The action execution require more input in order to succeed.StringINPUT  static String LOGIN The action could not execute, since the user most was not logged in.StringLOGIN  static String NONE The action execution was successful but do not show a view.StringNONE  static String SUCCESS The action execution was successful. StringSUCCESS  Method Summary String execute() Where the logic of the action is executed.Stringexecute Avishek Arang :: 20/02/ com.opensymphony.xwork2 Interface Action

- - Starting Struts2 by Ian Roughley [free ebook]. - Struts 2 Design and Programming: A Tutorial by Budi Kurniawan. Avishek Arang :: 20/02/ Bibliography