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Development Platforms

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  1. Development Platforms 2110472 Computer Networks Natawut Nupairoj, Ph.D. Department of Computer Engineering Chulalongkorn University

  2. Outline • Overview. • J2EE Platform. • Microsoft .NET Platform. • Web Service Platform.

  3. Overview • Static vs. dynamic pages. • Common Gateway Interface (CGI) • External extension (program) for web server. • Used mostly to connect to database. • Early days • C and perl. • Counter, guest book, graph generator. • Out-of-process model.

  4. Basic CGI Model Web Server Process CGI Program (External) Parameters HTML page • Problem ? • Low performance • Must run a new program every time it is being invoked. • In-process model – include interpreter inside web server • mod_perl. • ASP. • Plug-in model – separate process (but already started). • External AppServer through socket.

  5. Java Platforms • Java-Based Platforms • J2SE (Standard Edition) • JVM / JRE. • Applet and applications. • J2ME (Micro Edition) • For mobile and wireless equipment. • Midlet. • J2EE (Enterprise Edition) • A set of services. • Servlet, JSP, and EJB.

  6. Java Platforms (2)

  7. J2EE Services • Java Server Page (JSP). • Servlet. • Enterprise JavaBean (EJB). • Java Connectivity Architecture (JCA). • Java Message Service (JMS). • Java Management Extension (JMX). • Java Naming and Directory Interface (JNDI).

  8. J2EE Architecture

  9. JSP Example

  10. Servlet Example import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class HelloWorldServlet extends HttpServlet { public void doGet (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { HTML res.setContentType( "text/html" ); ServletOutputStream out = res.getOutputStream(); out.println( "<html>" ); out.println( "<head><title>Hello World</title></head>" ); out.println( "<body>" ); out.println( "<h1>Hello World</h1>" ); out.println( "<p>Congratulations, your servlet is working!</p>" ); out.println( "</body>" ); out.println( "</html>" ); } }

  11. Microsoft .NET • Suite of products • Programming Languages • C#. • ASP.NET. • VB.NET. • Third parties: NetCOBOL, Visual Perl, Visual Python, etc. • Development system. • Servers. • Common Language Runtime • JVM-liked, but supporting multiple languages.

  12. .NET Architecture

  13. Generating Dynamic Pages • Model-View-Control Pattern • Model – data provider • Connect to the database. • View – presentation provider • Generate HTML page from Model. • Control – logic provider • Receive a request and control both View and Model.

  14. MVC Pattern Business Logic & Presentation Database Web Server Biz Logic (Control) Database Logic (Model) Browser Presentation (View)

  15. Benefits of MVC Pattern • Simple to Maintain • Separate business, database, and presentation logic. • Database access is encapsulated in DB logic. • Flexible presentation • Template-like system. • Simple to support more than one languages.

  16. J2EE in Actions

  17. .NET in Actions

  18. J2EE vs. .NET • J2EE • Multi-Platforms: Unix, Windows, and others. • Scalable and high-performance. • Complete server-level services: JMS, EJB, JCA, and others. • .NET • Multi-Languages: C#, VB.Net, ASP.Net, and others. • Good development tools: Visual Studio .NET. • Simple to develop. • Built-in supports for XML and Web services. • CLR will play a very critical role.

  19. References • H. Sheil and M. Monteiro, “Rumble in the jungle: J2EE versus .Net, Part 1”, JavaWorld, June 2002, http://www.javaworld.com/javaworld/jw-06-2002/jw-0628-j2eevsnet_p.html. • J. Lurie and R. Belanger, “The great debate: .NET vs. J2EE”, Javaworld, March 2002, http://www.javaworld.com/javaworld/jw-03-2002/jw-0308-j2eenet_p.html. • jGuru, JavaServer Pages Fundamentals,http://developer.java.sun.com/developer/onlineTraining/JSPIntro/contents.html.

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