A software component is a unit of composition with contractually specified interfaces and explicit context dependencies only.

By component development, we mean the production of components that implement specific functionality within the context of a software architecture. The functionality is encapsulated and packaged and then integrated with other components using an interconnection method.

What we now call component-based software development flows in an unbroken line from these early beginnings. Modern components, the latest instantiation of which are Web-based services that populate service-oriented architectures, are much larger and much more sophisticated, carry us much higher into domain-specific application realms, and have more complex interaction mechanisms than subroutine invocation (mechanisms that are standardized).

Analytic Module of Component Development:

• Introduction to Web Application Technologies
• Developing a View Component
• Developing a Controller Component
• Developing Dynamic Forms
• Sharing Application Resources Using the Servlet Context
• Designing the Business Tier
• Developing a Web Application Using Struts
• Developing Web Applications Using Session Management
• Using Filters in Web Applications
• Integrating Web Applications With Databases
• Developing JSP Pages
• Developing JSP Pages Using Custom Tags
• Developing Web Applications Using Struts Action Forms
• Building Reusable Web Presentation Components

Interactive Components Shopping carts Online shopping catalogues Credit card processing Member registration Restricted access areas Login & password retrieval Electronic newsletters and other   mailing systems Sitewide search Database & content specific    searching Job boards Bulletin boards Online chat Polls and surveys Ratings and eeviews Event calendar Advanced administration panels Website statistics Website forms like "contact us", resume    builder, user registration, submission forms    etc. Live customer support and much more…