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Introduction to J2EE

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J2EE 3-TIER ARCHITECTURAL MODEL:

COMPONENTS IN EACH LAYER:

  • Client-tier components run on the client machine.
  • Web-tier components run on the J2EE server.
  • Business-tier components run on the J2EE server.
  • Enterprise information system (EIS)-tier software runs on the EIS server.
  • Application clients and applets are client components.
  • Java Servlet and JavaServer Pages (JSP) technology components are web components.
  • Enterprise JavaBeans (EJB) components (enterprise beans) are business components.

Client Components:

A J2EE application can be web-based or non-web-based. An application client executes on the client machine for a non-web-based J2EE application, and a web browser downloads web pages and applets to the client machine for a web-based J2EE application.

Web Browsers:

The user’s web browser downloads static or dynamic Hypertext Markup Language (HTML), Wireless Markup Language (WML), or Extensible Markup Language (XML) web pages from the web tier. Dynamic web pages are generated by servlets or JSP pages running in the web tier.

Applets:

A web page downloaded from the web tier can include an embedded applet. An applet is a small client application written in the Java programming language that executes in the Java VM installed in the web browser.

Web Components:

J2EE web components can be either JSP pages or servlets.

Business Components:

Business code, which is logic that solves or meets the needs of a particular business domain such as banking, retail, or finance, is handled by enterprise beans running in the business tier.

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