1. Web-based Software Development - An introduction

2. The Client/Server Model
  Process to process communication (PPC)
The underlying platform of the client/server programming.
Web-based Software Development

3. The Client/Server Model
  Two Tier (Traditional) Client/Server Model
Exercise: Name a commonly used client/server technique.
Sockets programming
Web-based Software Development

4. The Client/Server Model
  Three Tier Client/Database/Server Model
? ?
APIs:
JDBC
ADO
Web-based Software Development

5. The Client/Server Model
  Two Tier Web Based Model
Web-based Software Development

6. Three Tier Web Based Model
Web-based Software Development

7. Multi-Tier Web Based Model
Various configurations?
Multiple Databases
Distributed Databases
Multiple application instances
Web server farm
Web-based Software Development

8. Sample Web Based Applications
dynamic web pages – interactive i/o
multimedia presentations
Web based multi-player games
access to remote databases
connectivity to legacy computer systems
front end of a transaction application
intranet applications
scientific simulation and visualization
Web-based Software Development

9. Web-based Software Development
Sample Web Based Applications - scientific simulation and visualization
Web-based Software Development

10. Representative Web technology
- Client Side Development
Interpreted or executed by the client (that is, the Web browser).
Note: Web pages are originally stored on the Web server.
Web-based Software Development

11. Representative Web technology
- Client Side Development
  Issues with client side scripting
Inconsistent support across the Web browsers
Source exposed to the viewer
Security
Awkward connectivity to back-end (e.g., ODBC)
Web-based Software Development

12. Representative Web technology
- Server Side Development
Interpreted or executed by the server side applications.
The result is then sent back to the Web browser.
Web-based Software Development

13. Representative Web technology
  Server Side Technologies
Common Gateway Interface (CGI)
Active Server Pages (ASP)
Java Servlets
Java Server Pages (JSP)
Distributed Components-Based Technology ( CORBA, DCOM, EJB, RMI, … )
Web-based Software Development

14. Representative Web technology
  Database Connections
JDBC: Java Database Connectivity
ODBC: Open Database Connectivity
OLE-DB
ADO: ActiveX Data Objects
Web-based Software Development

15. Representative Web technology
Components
Programming Tools
- languages, technologies and APIs
Web Browsers
Internet Explorer, Netscape Navigator
Web Servers
  Apache, IIS, …
Applications (Servers)
Oracle Application Server, WebSphere Advanced Server, WebLogic, Netscape Enterprise Server, …
Database Servers
Oracle Database Server, MS SQL Server, IBM DB2, SyBase, Informix, …
Java Virtual Machines (JVMs), plug-ins, activeX components, ...
Client-side programming:
HTML, JAVA Applets, Java Script, VB Script, VRML, XML, …
Server-side programming:
Java Servlets, Java Server Pages, Active Server Pages, CGI, Java Script, VB Script, ...
ODBC, JDBC, ADO, SQL Net, SQLJ, ...
Web-based Software Development