Java Server Faces

1. 95-733 Internet Technologies Java Server Faces Model/View/Controller Design Pattern for Web Development Slides adapted from “Core JavaServer Faces” by Geary and Horstmann, the J2EE Tutorial from Sun Microsystems, and “Developing a Visual Web JSF Application” from NetBeans.org. Master of Information System Management

2. Three Main Parts to JSF Framework • A Collection of GUI components for drag and drop web site development • An event driven programming model • A component model supporting third party component development Master of Information System Management

3. Detailed Features of JSF • Bean management • Validation model • Component library that permits extensions • Flexible rendering (not necessarily XHTML) • Configurable navigation • State management • Conversion Model • Relies on JSP and Servlet technology • Think “GUI Building” for the web Master of Information System Management

4. JSF Fundamentals • Tags correspond to components in a component tree • A request normally goes through several stages of processing on the server • A built-in FacesServlet handles request processing and the JSF life cycle Master of Information System Management

5. JSF Life Cycle Overview (From the J2EE Tutorial) Master of Information System Management

6. Restore an old or construct a new component page (or view) Master of Information System Management

7. An old view (component tree) has been retrieved so allow each component in the view to inspect data values. These values will be redisplayed if validation or conversion errors are found. Adds events to an event queue. Master of Information System Management

8. The submitted values are stored as “local values”. If the data is invalid or conversions are not possible then Render Response is called directly and the user sees the bad data. Master of Information System Management

9. Local values are OK and are used to update the beans. Master of Information System Management

10. The action method associated with the button or link that caused the form to be submitted is executed. The method returns a string for the navigation handler. The navigation handler uses the string to determine the next page. Master of Information System Management

11. The selected page is rendered into a markup language. Master of Information System Management

12. Development Steps • Build Model from Java Beans - Lifetime Configured by developer and managed by JSF - Request, Session, or Application Scope - Setters and getters accessed through JSF pages • Use UI Components to build JSF pages - Include JSF Tags, Validation and Event Listeners • Define Page Navigation rules in faces.config.xml Master of Information System Management

13. NetBeans JSF Demonstration(0) The example is from: http://testwww.netbeans.org/kb/docs/web/helloweb.html#01 Goal: Display a form on the browser. When submitted, the web server will call our application. The application will execute code in a java bean associated with the page. The bean will update page elements. JSF will render the same page with the changed data and send the page back to the web browser. Master of Information System Management

14. Netbeans JSF Demonstration(1) By adding a binding attribute we add setters and getters to a component. 1. File>New Project 2. Java Web Application 3. Name the project HelloWeb 4. Visual Web Java Server Faces 5. In properties for page1, enter a page title 6. Navigator>Page1>page1 Right Click Add Binding Attribute 7. Expand Woodstock Basic section of palette 8. Drag a label to page enter “Name:” return 9. Drag a text field to page enter “Enter your name” enter 10. In properties of text field, change textField1 to nameField 11. Right Click text field Add Binding Attribute 12. In properties of label component, enter nameField as for property 13. Drag a button to the page, type “Say hello” and enter. 14. Right click button and choose Add Binding Component. 15. In button properties, change id from button1 to helloButton 16. Drag static text component to the page. 17. In properties static text field, change id to helloText 18. Right Click static text and Add Binding Attribute Master of Information System Management

15. Netbeans JSF Demonstration(2) 19. Drag a Message Group to the page. Good for error reporting. 20. Double Click the button component. 21. The Java bean for page1 is visible. 22. Replace body of helloButton_action with : public String helloButton_action() { String name = (String)nameField.getText(); helloText.setText("Hello, " + name + "!"); return null; } 23. Click Run Main Project. Master of Information System Management