By: aathishankaran Printer Friendly Format
J2EE client can be a Web client or an application client. Now we will see about
both web client and application client in this article.
Web client consists of two parts: dynamic Web pages containing various types of
markup language (HTML, XML, and so on), which are generated by Web components
running in the Web tier, and a Web browser, which renders the pages received
from the server.
Web client is sometimes called a thin
client. Thin clients usually do not do things like query databases,
execute complex business rules, or connect to legacy applications. When you use
a thin client, heavyweight operations like these are off-loaded to enterprise
beans executing on the J2EE server where they can leverage the security, speed,
services, and reliability of J2EE server-side technologies.
Web page received 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 virtual machine installed in the Web browser. However,
client systems will likely need the Java Plug-in and possibly a security policy
file in order for the applet to successfully execute in the Web browser.
components are the preferred API for creating a Web client program because no
plug-ins or security policy files are needed on the client systems. Also, Web
components enable cleaner and more modular application design because they
provide a way to separate applications programming from Web page design.
Personnel involved in Web page design thus do not need to understand Java
programming language syntax to do their jobs.
J2EE application client runs on a client machine and provides a way for users to
handle tasks that require a richer user interface than can be provided by a
markup language. It typically has a graphical user interface (GUI) created from
Swing or Abstract Window Toolkit (AWT) APIs, but a command-line interface is
clients directly access enterprise beans running in the business tier. However,
if application requirements warrant it, a J2EE application client can open an
HTTP connection to establish communication with a servlet running in the Web
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