Struts Ppt 1


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  • Frame work Provides Core Services
    A framework is designed to offer a large number of related services centered on a broad theme.
    It is also base for components
  • 1.A Model 1 application control is decentralized, because the current page being displayed determines the next page to display
    2. Architecture usually leads to a significant amount of Java code embedded within the JSP page While this may not seem to be much of a problem for Java developers, it is certainly an issue if your JSP pages are created and maintained by designers
  • This approach typically results in the cleanest separation of presentation from content, leading to clear delineation of the roles and responsibilities of the developers and page designers.
  • When building physical structures Construction Engineers use support for each floor of building .Likewise, Software engineers also use some frame work to support each layer of their Applications. That why we call it as Struts.
  • WebDAV was a working group of the Internet Engineering Task Force .The name is an abbreviation for Web-based Distributed Authoring and Versioning and also refers to the set of extensions to the Hypertext Transfer Protocol (HTTP) that the group defined which allows users to collaboratively edit and manage files on remote World Wide Web servers
  • System State Beans
    Actual state of a system is normally represented as a set of one or more JavaBeans classes, whose properties define the current state.
    For small to medium sized applications, business logic beans might be ordinary JavaBeans that interact with system state beans passed as arguments, or ordinary JavaBeans that access a database using JDBC calls
    For larger applications, these beans will often be stateful or stateless Enterprise JavaBeans (EJBs).
  • Struts Ppt 1

    1. 1. Struts Agenda  Software Crises  What is Framework  Model1,Model2  What is Struts  Why we need it  Why is it called as Struts  Advantages of Struts  Controller Elements & it’s Responsibilities  Model Elements & it’s Responsibilities  View Elements & it’s 
    2. 2. Challenges Exist In Software Development & Software Crisis * Time shown with out day light savings  Projects must be developed Quickly.  Projects must be in High-Quality.  Application Stability.  Better code Maintainability.  Lower Cost for Developing Application.
    3. 3. What is Framework  A software framework is a re-usable design for a software system (or subsystem).  A framework is a pre-built assembly of components and is designed to be extended.  It is also base for components.
    4. 4. Advantages of Framework  Provide a procedure for the development of Application.  Saves developers Time.  Provides same approach for all developers for developing code and Consistency in Software Design  Provide low-level services that developers can use to speedup development.  It also reduces software development and maintenance costs.
    5. 5. Model 1  In the Model 1 the JSP page is responsible for processing the incoming request and replying back to the client.
    6. 6. Disadvantages of Model1  It does not have separate controller  This Architecture usually leads to a significant amount of Java code embedded within the JSP page  Model 1 Developers Designers JSP  Developers and designers must work on the same files!
    7. 7. Model 2  This Model2 approach combines the use of both servlets and JSP, using JSP to generate the presentation layer and servlets to perform process-intensive tasks.  Model2 architecture introduces a Servlet between the browser and the JSP pages.
    8. 8. Model2 Advantages  No processing/business logic within the JSP page.  Model 2 applications are easier to maintain and extend, because views do not refer to each other directly.  The Model 2 controller servlet provides a single point of control for security and often encapsulates incoming data into a form usable by the back-end MVC model.  It also Provides unique responsibility to each component and each is
    9. 9. Model 2 Components and Responsibilities  Model  The Model portion of an MVC-based System responsible for internal state of the system, and actions that can be taken to change that state  Decide “How to do” Controller  -Decide “What to do”  -The Controller portion of the application is focused on receiving requests from the client ,deciding what business logic is to be performed ,and then delegating responsibility for producing the next phase of user interface to an appropriate View
    10. 10. What is Struts  An open source web application framework based on j2ee and java which implements the MVC design pattern is called Struts. Why is it called as Struts Strut synonym is Iron-rod.
    11. 11. Why we use and what are the advantages of Struts  It is open source.  Provides components for building Web Applications that speedup development and saves time for developers.  It makes complex applications into simple.  Built in Exception Handling  I18n support with resource bundles.  Built in validation framework.
    12. 12. Struts Architecture
    13. 13. Struts Framework Components  Controller Components - Direct the Action  Model Components - Access Data and Systems  View Components - What the users see
    14. 14. Struts Controller Components Struts-config.xml
    15. 15. Actionservlet and Requestprocessor  Receive the HttpServletRequest  Automatically populate a JavaBean from the request parameters.  Handle Locale Issues  Determine which  Extends javax.servlet.http.HttpSe rvlet  Receives all framework requests  Selects proper application module  Delegates request handling to the RequestProcessor instance  One ActionServlet
    16. 16. Actionservlet and Requestprocessor  ActionServlet dispatch request to Request Processor(New from 1.1. previous this behaviour was in Action servlet)  The work of Request Processor is:-  Finding ActionMapping.  Mapping Action to FormBean.  Creating FormBean Object.  Calling reset() method of FormBean  Calling Validator of FormBean  If no form(jsp/html) validation errors calls execute method in Action Class and finding response to request.
    17. 17. What is An Action Class  Extends org.apache.struts.action.Actio n  Overrides the execute() method  Acts as a bridge between user- invoked URI and a business method  Return information about which
    18. 18. Struts-Config.xml  The power and flexibility of struts is due to the extracting of configuration information from across frame work.  Configuration file contains action mappings (determines navigation)  Controller uses mappings to turn  Tags in this file are:-  Data Sources.  Form Beans.  Global Exceptions.  Global Forwards  Actions  Controller  Message resources  Plug-in Struts-Config.xml
    19. 19. The Model Components Model Components  Java classes  middle tier components (EJB, Javabeans, …)  database access components Used to represent the Internal state of the system  Actions that can change that state  Internal state of system represented by  JavaBeans
    20. 20. Action Form Extends the ActionForm class  Create one for each input form in the application  It is just like a java bean, Store data temporary, reset default values to views, validate input view.  Hold state and behavior for user input.  If defined in the ActionMapping configuration file, the Controller Servlet will perform the following:-  Check for instance of bean of appropriate class  If no bean exists, one is created automatically  For every request parameter whose name corresponds to the name of a property in the bean, the corresponding setter method will be called  The updated ActionForm bean will be passed to the Action Class execute() method when it is called, making these values immediately available. ActionForm Example
    21. 21. The View Components
    22. 22. Struts JSP Tag Libraries  HTML  Bean  Logic  Nested  Tiles  Template
    23. 23. Html Tag & Bean Tag Libraries  Tags used to create Struts input forms  Examples (checkbox,image, link, submit ,text, text area)  Tags used for accessing JavaBeans and their properties  Examples (Define,message, write)
    24. 24. Logic ,Tiles & Nested Tag Libraries  Managing conditional generation of output text  Looping over object Collections for repetitive generation of output text  Example (empty,lessThan, greaterThan)  Extended the base struts tags to allow them to relate to each other in nested nature  Tiles tags Each part ("Tile") of webpage can be reused as often as needed throughout your application. This reduces the amount of markup
    25. 25. Template Tag Library  The "struts-template" tag library contains tags that are useful in creating dynamic JSP templates for pages which share a common format. These templates are best used when it is likely that a layout shared by several pages in your application will change. The functionality provided by these tags is similar to what can be achieved using standard JSP include
    26. 26. Action Message & Action Error  Used to signify general purpose informational and error messages  Rely on the resource bundles  JSP Tags can access them  </html:errors>
    27. 27. Internationalization Support  Much of the framework functionality based on java.util.Locale  Struts Uses Java Resource Bundles.  Ex:-  Date ,Time and Currency
    28. 28. Other Features Suported by Struts Framework  Multi-Module Support  Declarative Exception-Handling  Dynamic Action Forms  Plugins  Tiles integrated With Core  Validator Integrated With Core
    29. 29. Struts Sequence Diagram
    30. 30. Struts Example ogin_app  Webapps|  | sample(Application Name)  |__ login.jsp  |__newLogin.Jsp  |__success.jsp  |__WEB-INF  |__web.xml  |__Struts-config.xml  |__*.tldAll the struts tld files  |__lib  |__*.jarAll the jar files  | __classes  |__LoginAction,LoginForm,
    31. 31. Disadvantages  Bigger Learning Curve  Not Based on Domain Model  Property Names  Views are restricted.
    32. 32. Questions & Answers
    33. 33. Thank u