development platforms 2110472 computer networks natawut nupairoj, ph.d. department of computer...
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Development Platforms
2110472 Computer Networks
Natawut Nupairoj, Ph.D.
Department of Computer Engineering
Chulalongkorn University
Outline
Overview. J2EE Platform. Microsoft .NET Platform. Web Service Platform.
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.
Basic CGI Model
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.
WebServer
Process
CGIProgram(External)
Parameters
HTML page
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.
Java Platforms (2)
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).
J2EE Architecture
JSP Example
Servlet Exampleimport 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>" );
}}
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.
.NET Architecture
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.
MVC Pattern
Browser
Biz Logic(Control)
Presentation(View)
Web
Serv
er
DatabaseLogic
(Model)
Business Logic & Presentation Database
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.
J2EE in Actions
.NET in Actions
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.
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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