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Before you start
This tutorial is for developers who build applications that use web services with different approach. By using web services, your application can publish its function or message to the rest of the world. Web services use XML to code and to decode data, and SOAP to transport it (using open protocols).
This tutorial series teaches the basic concepts of web services and with different approach of developing web service using different SOAP engines like Apache AXIS2, Apache CXF and JAX-WS. This tutorial series also provides a solution for sending large attachment with SOAP messages by using MTOM (SOAP Message Transmission Optimization Mechanism) which encodes binary data in base64Binary and sends the data as binary attachment rather than keeping it with actual SOAP message. This series also shows that by simply making method calls using the SAAJ API, you can read and write SOAP-based XML messages, and you can optionally send and receive such messages over the Internet.
Part 1 starts simply, explaining the basic concepts behind web services and showing you how to develop web service with Axis2 using Different Approach (Code First and Contract First).
Part 2 starts simply by developing a Hello User web Service with JAX-WS and then takes things a step further by showing an example of File Download web service(where client can download file from web service and store in its location)using MTOM with JAX-WS. It also shows how to invoke web service from SAAJ Client.
Part 3 simply shows how to develop a File uploading web service(where client can Upload file/attachment to Web service) using Apache CXF supports for MTOM with XOP implementation
This Tutorial series will describes the way of developing web service with different Web Service Engine like (Axis2,JAX-WS and CXF). Web services can be implemented using different application protocols like SOAP, XML, JSON, RESTful HTTP, and support various transport protocols like HTTP or JMS (Java Message Service). In order to create a Web service, you will need some tools. At a minimum, you will need some type of SOAP processing engine to parse the messages that are received and to call the functions or methods that the message indicates. Many products are on the market that provides this processing. The goal of every Web services development tool is to build a bridge between the SOAP processor and the business logic that is running on the server. Normally, this business logic is kept separate from the SOAP processing logic.
In this Part 1 of the tutorial series you will learn how to develop a Credit Card Validation web service with Code first (Bottom up) approach and followed by Product Catalog web service development with Contract First(Top Down) Approach using Axis2.
In this tutorial, you will learn how to:
- Download and install the web servers (Tomcat), if it is not already installed, and make minor additions to it to successfully implement the given examples.
- Download and install Axis2 engine to generate the Stubs as well as Service skeleton.
- Download and install Axis2 runtime environment into Tomcat for developing and deploying web service (Credit Card Validation and Product Catalog).
- Developing POJO Client for the web service (Credit Card Validation) using Eclipse IDE.
This tutorial assumes familiarity with some basic concepts of the Eclipse IDE, and basic understanding of web service architecture.
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