Wednesday, 20 June 2012

Web Services

Web Services Introduction

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 Web Services can convert your applications into Web-applications.
Web Services are published, found, and used through the Web.

 What You Should Already Know

Before you continue, you should have a basic understanding of the following:
  • HTML
  • XML
What are Web Services?

  • Web services are application components
  • Web services communicate using open protocols
  • Web services are self-contained and self-describing
  • Web services can be discovered using UDDI
  • Web services can be used by other applications
  • XML is the basis for Web services

How Does it Work?
The basic Web services platform is XML + HTTP.
XML provides a language which can be used between different platforms and programming languages and still express complex messages and functions.
The HTTP protocol is the most used Internet protocol.
Web services platform elements:
  • SOAP (Simple Object Access Protocol)
  • UDDI (Universal Description, Discovery and Integration)
  • WSDL (Web Services Description Language)
We will explain these topics later in the tutorial.

A few years ago Web services were not fast enough to be interesting.

Interoperability has Highest Priority
When all major platforms could access the Web using Web browsers, different platforms could interact. For these platforms to work together, Web-applications were developed.
Web-applications are simply applications that run on the web. These are built around the Web browser standards and can be used by any browser on any platform.

Web Services take Web-applications to the Next Level
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).
With Web services, your accounting department's Win 2k server's billing system can connect with your IT supplier's UNIX server.

Web Services have Two Types of Uses
Reusable application-components.
There are things applications need very often. So why make these over and over again?
Web services can offer application-components like: currency conversion, weather reports, or even language translation as services.
Connect existing software.
Web services can help to solve the interoperability problem by giving different applications a way to link their data.
With Web services you can exchange data between different applications and different platforms.

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Web Services have three basic platform elements: SOAP, WSDL and UDDI.

What is SOAP?
SOAP is an XML-based protocol to let applications exchange information over HTTP.
Or more simple: SOAP is a protocol for accessing a Web Service.
  • SOAP stands for Simple Object Access Protocol
  • SOAP is a communication protocol
  • SOAP is a format for sending messages
  • SOAP is designed to communicate via Internet
  • SOAP is platform independent
  • SOAP is language independent
  • SOAP is based on XML
  • SOAP is simple and extensible
  • SOAP allows you to get around firewalls
  • SOAP is a W3C standard
Read more about SOAP on our Home page.

What is WSDL?
WSDL is an XML-based language for locating and describing Web services.
  • WSDL stands for Web Services Description Language
  • WSDL is based on XML
  • WSDL is used to describe Web services
  • WSDL is used to locate Web services
  • WSDL is a W3C standard
Read more about WSDL on our Home page.

What is UDDI?
UDDI is a directory service where companies can register and search for Web services.
  • UDDI stands for Universal Description, Discovery and Integration
  • UDDI is a directory for storing information about web services
  • UDDI is a directory of web service interfaces described by WSDL
  • UDDI communicates via SOAP
  • UDDI is built into the Microsoft .NET platform

Using the Web Service Example
In the previous page we created a Web service.
The FahrenheitToCelsius() function can be tested here: FahrenheitToCelsius
The CelsiusToFahrenheit() function can be tested here: CelsiusToFahrenheit
These functions will send an XML response like this:
<?xml version="1.0" encoding="utf-8" ?>
<string xmlns="">38</string>

Put the Web Service on Your Web Site
Using a form and the HTTP POST method, you can put the web service on your site, like this:
Top of Form
Fahrenheit to Celsius:
Bottom of Form
Top of Form
Celsius to Fahrenheit:
Bottom of Form

How To Do It
Here is the code to add the Web Service to a web page:
<form action='tempconvert.asmx/FahrenheitToCelsius'
method="post" target="_blank">
    <td>Fahrenheit to Celsius:</td>
    <input class="frmInput" type="text" size="30" name="Fahrenheit">
    <td align="right">
     <input type="submit" value="Submit" class="button">

<form action='tempconvert.asmx/CelsiusToFahrenheit'
method="post" target="_blank">
    <td>Celsius to Fahrenheit:</td>
    <input class="frmInput" type="text" size="30" name="Celsius">
    <td align="right">
    <input type="submit" value="Submit" class="button">
Substitute the "tempconvert.asmx" with the address of your web service like:

Web Services Summary
This tutorial has taught you how to convert your applications into web-applications.
You have learned how to use XML to send messages between applications.
You have also learned how to export a function (create a web service) from your application.

Now You Know Web Services, What's Next?
The next step is to learn about WSDL and SOAP.
WSDL is an XML-based language for describing Web services and how to access them.
WSDL describes a web service, along with the message format and protocol details for the web service.
If you want to learn more about WSDL, please visit our WSDL tutorial.
SOAP is a simple XML-based protocol that allows applications to exchange information over HTTP.
Or more simply: SOAP is a protocol for accessing a web service.
If you want to learn more about SOAP, please visit our SOAP tutorial.


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