You can plan to develop and implement web services based
on a variety of Java programming models.
Before you begin
Web services reflect the service-oriented architecture
approach to programming. This approach is based on the idea of building
applications by discovering and implementing network-available services,
or by invoking the available applications to accomplish a task. Web
services deliver interoperability, for example, web services applications
provide a way for components created in different programming languages
to work together as if they were created using the same language.
Web services rely on existing transport technologies, such as HTTP,
and standard data encoding techniques, such as Extensible Markup Language
(XML), for invoking the implementation.
Best practice: IBM® WebSphere® Application
Server supports the Java API
for XML-Based Web Services (JAX-WS) programming model and the Java API for XML-based RPC (JAX-RPC)
programming model. JAX-WS is the next generation web services programming
model extending the foundation provided by the JAX-RPC programming
model. Using the strategic JAX-WS programming model, development of
web services and clients is simplified through support of a standards-based
annotations model. Although the JAX-RPC programming model and applications
are still supported, take advantage of the easy-to-implement JAX-WS
programming model to develop new web services applications and clients. best-practices
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Read the web services scenario overview information
to learn about the story of a fictional online garden supply retailer
named Plants by WebSphere and how this retailer incorporated
the web services concept. You can also review the Samples section
of the Information Center for web services samples. These samples
demonstrate enterprise beans and JavaBeans components
that are available as web services.
The JAX-WS Web services
samples demonstrate the simple message exchange patterns using both
synchronous and asynchronous invocation of web services in SOAP 1.1
and SOAP 1.2 environments. The samples are composed with web service
standards such as WS-Addressing (WS-A) , WS-Reliable Messaging (WS-RM),
and WS-Secure Conversation (WS-SC), which you can use to complete
a broad range of interoperability tests. The samples demonstrate the
use of JavaBeans artifacts and static service
endpoints and proxy-based clients. Additionally, a sample is provided
that demonstrates Message Transmission Optimization Mechanism (MTOM).
About this task
You must re-write existing JAX-RPC applications if you
want to take advantage of the features of the JAX-WS programming model.
Procedure
- Identify your goals and design web services to fit your
e-business solution. Consider what you want to accomplish
by using web services. Decide how web services fit into your current
topology, applications and programming model. Determine how the Web
services process requests on the server and how the clients manage
and use the web service.
- Design your web services for reliability, availability,
manageability and security. For example, you want your
web services to process a transaction in a reasonable time at all
hours of the day and provide users with optimal security, such as
authentication for buyers. Planning to use web services to work with WebSphere Application Server helps to meet
these requirements.
- Review the standards used in developing and deploying web
services onto WebSphere Application Server. Development
and deployment are based on a variety of Java programming
models.
- Decide what development and implementation tools to use. You can use a variety of manual development and implementation
tasks. Whether you have an existing web service to implement or you
want to develop your own from a JavaBeans implementation
or from an Enterprise JavaBeans (EJB)
module, you can choose different tasks respective to your resources.
You can also use assembly tools to complete development and implementation
tasks.
- Install the application server. For detailed
information on installing the application server, read about installing
your application serving environment.
- Review web services samples.
Results
You have a design plan for implementing web services applications
into your business architecture.