Jsp with mvc
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The document discusses the Model-View-Controller (MVC) design pattern. It explains that MVC separates an application into three main components: the Model, the View, and the Controller. The Model manages the data logic, the View displays the presentation logic, and the Controller handles user input and interaction between the Model and View. Some key benefits of MVC include flexibility to change views without affecting other components, and separating concerns for improved maintenance and testing.
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- 1. Overview of Design Patterns & The MVC Design Pattern Sapana Mehta
- 2. Sapana Mehta (CS-6V81) J2EE • Components – Enterprise Java Beans (EJB) – Java Server Pages (JSP) – Servlets • Containers (service providers) – Web container – Bean Container • Connectors (connection service providers)
- 4. Sapana Mehta (CS-6V81) J2EE and Design Patterns • J2EE: AN OPERATING SYSTEM FOR THE WEB Enterprise web applications, which live on networks and are accessible through browsers, are redefining Enterprise Web Software. This is the next wave of computing. • The J2EE architecture is built to enable component developers to use a Model View Controller (MVC) Design Pattern.
- 5. Sapana Mehta (CS-6V81) MVC continued • Model encapsulates the core data and functionality • View encapsulates the presentation of the data there can be many views of the common data • Controller accepts input from the user and makes request from the model for the data to produce a new view.
- 6. Sapana Mehta (CS-6V81) MVC Structure for J2EE
- 7. Sapana Mehta (CS-6V81) MVC Architecture • The Model represents the structure of the data in the application, as well as application-specific operations on those data. • A View (of which there may be many) presents data in some form to a user, in the context of some application function. • A Controller translates user actions (mouse motions, keystrokes, words spoken, etc.) and user input into application function calls on the model, and selects the appropriate View based on user preferences and Model state.
- 8. Sapana Mehta (CS-6V81) Advantages of MVC • Separating Model from View (that is, separating data representation from presentation) - easy to add multiple data presentations for the same data, -facilitates adding new types of data presentation as technology develops. -Model and View components can vary independently enhancing maintainability, extensibility, and testability.
- 9. Sapana Mehta (CS-6V81) Advantages of MVC design Pattern • Separating Controller from View (application behavior from presentation) - permits run-time selection of appropriate Views based on workflow, user preferences, or Model state. • Separating Controller from Model (application behavior from data representation) - allows configurable mapping of user actions on the Controller to application functions on the Model.
- 10. Sapana Mehta (CS-6V81) Consequences or Benefits • We make changes without bringing down the server. • We leave the core code alone • We can have multiple versions of the same data displayed • We can test our changes in the actual environment. • We have achieved “separation of concerns”