Matakuliah Tahun : Web Programming : 2009 Design Pattern & MVC Pertemuan 12 Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : • Menjelaskan Konsep Design Pattern • Menjelaskan sejarah Object Oriented Design Pattern • Menjelaskan Konsep MVC 3 Outline Materi • Design Pattern • MVC • Design Pattern Application 4 History of Object Oriented Design Pattern • During 1991-1994, Erich Gamma and his friends write the book Design Patterns: Elements of Reusable Object-Oriented Software. • This book describes 23 design patterns. • The book groups design patterns into three categories- creational design patterns, structural design patterns and behavioral design patterns. 5 Design Pattern • Design patterns allow developers to design specific parts of systems, such as abstracting object instantiations or aggregating classes into larger structures. • Design patterns also promote loose coupling among objects. • We introduce the popular Model View Controller and Layers architectural patterns. 6 MVC • Model-View-Controller (MVC) architectural pattern, which separates application data (contained in the model) from graphical presentation components (the view) and input-processing logic (the controller). • The controller implements logic for processing user inputs. The model contains application data, and the view presents the data stored in the model. 7 MVC 8 Layers 9 Layers • The Information tiers maintains data for the application, typically storing it in a database. • The middle tier acts as an intermediary between the information tier and the client tier. • The client tier is the application’s user interface, such as a standard web browser. User interact directly with the application through the user interface. 10 Sample using Struts 1. 2. 3. Create a JSP form that supporting Struts Framework Execute the form Click Struts’s link. 11 Simple Struts <%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %> <%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %> <%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic" %> <html:html locale="true"> <head> <title><bean:message key="welcome.title"/></title> <html:base/> </head> <body bgcolor="white"> <logic:notPresent name="org.apache.struts.action.MESSAGE" scope="application"> <font color="red"> ERROR: Application resources not loaded -- check servlet container logs for error messages. </font> </logic:notPresent> <h3><bean:message key="welcome.heading"/></h3> <p><bean:message key="welcome.message"/></p> </body> </html:html> 12 Sample Struts 13 Design Pattern in Java 14 Other Java Technologies • • • • SAX & DOM JMS Java Cryptography Extension JSF 15
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