JSF-Starter
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JSF (JavaServer Faces) is a standard Java web framework that provides components for building user interfaces, and handles requests and responses. It uses a component-based model and a request processing lifecycle with 6 phases. Key aspects of JSF include UI components, a faces configuration file, managed beans, and event handling at the server-side. Web development with JSF involves JSP pages, UI components, custom tag libraries, JavaBeans, and a faces-config.xml configuration file.
JSF-Starter
- 1. •• •• •• •• What is JSF? •• •• •• ••• •••• ••••••••• What is JSF? Roosendaal - 22/09/2005 Gie Indesteege - ABIS Training & Consulting gindesteege@abis.be ABIS Training & Consulting 1
- 2. JavaServer Faces (JSF) What is JSF? • Web frameworks • JSF terminology • JSF life cycle • Web development with JSF • Q&A What is JSF? 2
- 3. Web frameworks What is JSF? Strong requirements needed for e-business applications: scalability, availability, security, flexibility, ... No chances taken -> use reliable, well supported framework • separation of concerns • layering • container/component • extensible • active community/active development • standards based What is JSF? 3
- 4. Model View Controller framework What is JSF? Request Servlet Browser Controller Logic JavaBean EIS Response JSP Model View • Controller servlet regulates navigation • JavaBean provides/accesses business logic • JavaServer Page (JSP) creates presentation/view What is JSF? 4
- 5. JSF goes beyond MVC (model 2) What is JSF? invoke FacesServlet action method t es qu re faces- select config.xml Browser EIS JavaBean res po ns e JSP • mainly view framework • obtain configuration from external source (i.e. XML file) • use Request Handlers as Commands to delegate control What is JSF? 5
- 6. JSF architecture What is JSF? (JSF 1.0) API’s • JSF (javax.faces.*) • JSTL • Apache Commons What is JSF? 6
- 7. JSF framework What is JSF? Important characteristics: • stateful UI component model - separation of presentation (rendering), mark-up generation (HTML, WML, XML, ...) - and business logic -> integration with model objects (JavaBeans) • processing of client-side events (at server side) • extensible type conversion system • form handling and validation What is JSF? 7
- 8. Advantages of JSF What is JSF? • official Java standard JSF 1.0 - JSR 127 JSR 252: JavaServer Faces 1.2 - Proposed Final Draft (22/8/2005) • easier to create multi-channel architectures - not restricted to JSP (HTML) • event handling (server side) • Swing-like GUI creation possible • Internationalisation http://java.sun.com/j2ee/javaserverfaces/ What is JSF? 8
- 9. JavaServer Faces (JSF) What is JSF? • Web frameworks • JSF terminology • JSF life cycle • Web development with JSF • Q&A What is JSF? 9
- 10. JSF terminology What is JSF? Faces servlet - controller servlet, part of the JSF framework Faces configuration (faces-config.xml) - configuration of web application under control of JSF - (page) navigation rules - managed beans (bean under control of JSF framework) Faces JavaServer Pages - special tag libraries (core, html, ...) - faces expression language What is JSF? 10
- 11. JSF terminology (cont.) What is JSF? Faces (UI) components - standard set of graphical widgets and controls (stateful) - based on JavaBeans - associated with renderer - organised in tree structure (per JSP) What is JSF? 11
- 12. JavaServer Faces (JSF) What is JSF? • Web frameworks • JSF terminology • JSF life cycle • Web development with JSF • Q&A What is JSF? 12
- 13. JSF life cycle What is JSF? There are 6 phases in the JSF life cycle: • Reconstitute request tree (restore view) • Apply request values • Process validations • Update model values • Invoke application • Render response What is JSF? 13
- 14. JSF life cycle (part 1) What is JSF? No application data passed JSF Framework Restore Request view no data Render Response response What is JSF? 14
- 15. JSF life cycle (part 2) What is JSF? Use of (HTML) form data JSF Framework Restore ... Request view no data Update Render ... model Response response values UI components organised in hierarchical tree per JSP bind input fields to business data in backing bean (managed bean) What is JSF? 15
- 16. JSF life cycle (part 3) What is JSF? Navigation between pages (static vs. dynamic) JSF Framework Restore ... Request view no data Update Render Invoke model Response response application values rules in configuration file (faces-config.xml) <navigation-rule> <from-view-id>/index.jsp</from-view-id> <navigation-case> <from-outcome>success</from-outcome> <to-view-id>/welcome.jsp</to-view-id> </navigation-case> What is JSF? 16
- 17. JSF life cycle (part 4) What is JSF? Validation JSF Framework Apply Restore Process request Request view validations values no data validation error Update Render Invoke model Response response application values • syntax -> faces validators working on data in UI components • business -> logic accessing model values in managed beans Error messages via FacesMessage objects and special tags in JSP What is JSF? 17
- 18. JSF life cycle (final) What is JSF? Event handling JSF Framework Apply request values Process validations Restore PVE Request view PVE AE immediate input no data immediate command convervion/ validation error Invoke application Render Update model AE Response response values PVE AE C V VCL(n) VCL(a) AL(n) AL(a) A • action events - when a command is pressed (button or link) • process validation events- when value of an input field has changed • input events - immediate commands - immediate input • (pre- and post) phase events What is JSF? 18
- 19. JavaServer Faces (JSF) What is JSF? • Web frameworks • JSF terminology • JSF life cycle • Web development with JSF • Q&A What is JSF? 19
- 20. Web development with JSF What is JSF? JSF application consists of: • JSP pages • UI components represented as stateful objects on the server • a custom tag library for rendering UI components • a custom tag library for representing event handlers and validators • JavaBeans (or model objects) containing application-specific func- tionality and data • event listeners • server-side helper classes • validators, event handlers, and navigation handlers • application configuration resource file faces-config.xml What is JSF? 20
- 21. Web development with JSF What is JSF? Native Supported by IDE • IBM WebSphere Studio and Rational Developer • Sun Java Studio Creator • Borland JBuilder • Oracle JDeveloper • ... or Integration of JSF with EGL (see next presentation) What is JSF? 21
- 22. JavaServer Faces (JSF) What is JSF? • Web frameworks • JSF terminology • JSF life cycle • Web development with JSF • Q&A What is JSF? 22
- 23. JavaServer Faces (JSF) What is JSF? Thank you Gie Indesteege ABIS Training & Consulting What is JSF? 23