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19 - WebServices. Webservices in Java. Web Service client Selected and edited slides from Siva Jagadeesan The original version is here: Intro to Web Services and Apache Axis. Outline. Web Services Basics What is Web Service? Web Services Architecture XML Messaging XML-RPC SOAP - PowerPoint PPT Presentation
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2NOEA 2009Java-kursus – Web Services
Webservices in Java
• Web Service client• Selected and edited slides from Siva Jagadeesan• The original version is here:
Intro to Web Services and Apache Axis
3NOEA 2009Java-kursus – Web Services
Outline
• Web Services Basics– What is Web Service?– Web Services Architecture– XML Messaging
• XML-RPC• SOAP
– What is WSDL?– Development plan for Service Requestor– Development plan for Service Provider
4NOEA 2009Java-kursus – Web Services
Outline
• Intro to Apache Axis– What is Apache Axis?– Architecture of Apache Axis– Features of Apache Axis– Installing Apache Axis– Publishing Web Service through Apache Axis– Walkthrough of deploying and accessing a simple web
service using Apache Axis
5NOEA 2009Java-kursus – Web Services
What is Web Service?
A Web Service is any service that – is available over the web– uses standardized XML messaging– is OS and Programming language independent
6NOEA 2009Java-kursus – Web Services
XML Messaging
There are two ways of XML Messaging
• XML-RPC
• SOAP
7NOEA 2009Java-kursus – Web Services
What is XML-RPC ?
• is a simple protocol that uses XML messages to perform RPC
• Request are encoded in XML and send via HTTP• Response are encoded in XML and received via HTTP• is a easiest way to get started with web services
8NOEA 2009Java-kursus – Web Services
Sample XML-RPC Request
<methodCall>
<methodName>
com.agram.sayHello
</methodName>
<params>
<param>
<value>Java</value>
</param>
</params>
</methodCall>
9NOEA 2009Java-kursus – Web Services
Sample XML-RPC Response
<methodResponse> <params>
<param><value>
<string>Hello Java</string></value>
</param> </params></ methodResponse >
10NOEA 2009Java-kursus – Web Services
What is SOAP?
• Simple Object Access Protocol• SOAP is slightly more complicated than the XML-RPC• SOAP extended XML-RPC• It uses XML namespaces and XML Schemas.
11NOEA 2009Java-kursus – Web Services
SOAP Message
• Envelope is like a wrapper for content• Header is a optional element that
could contain control information• Body element includes requests and
responses• Body element will include a Fault
element in the event of an error
SOAP Message
Envelope
Header
Body
12NOEA 2009Java-kursus – Web Services
Sample SOAP Request
<SOAP-ENV:Envelopexmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:SOAP-ENV=http://schemas.xmlsoap.org/soap/envelope/
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<SOAP-ENV:Body> <ns1:sayHello xmlns:ns1="http://agram.com/"> <name xsi:type="xsd:string">Java</name></ns1:sayHello>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
13NOEA 2009Java-kursus – Web Services
Sample SOAP Response
<SOAP-ENV:Envelopexmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:SOAP-ENV=http://schemas.xmlsoap.org/soap/envelope/
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<SOAP-ENV:Body> <ns1:sayHelloReponse xmlns:ns1="http://agram.com/"> <result xsi:type="xsd:string">Hello
Java</result> </ns1:sayHelloResponse> </SOAP-ENV:Body>
</SOAP-ENV:Envelope>
14NOEA 2009Java-kursus – Web Services
What is WSDL?
• Web Services Description Language• Has 6 major elements
1. definitions – defines the name of the web service2. types – describes all the data types that will be transmitted3. message – defines the name of the message that will be transmitted4. portType – defines the operations 5. binding – defines how the message will be transmitted6. service – defines where the service is located
15NOEA 2009Java-kursus – Web Services
Development plan for Service Requestor
1) Find the web service (Google, Xmethods.net etc.)
2) Retrieve service description file
3) Create XML-RPC or SOAP client
4) Invoke remote service
16NOEA 2009Java-kursus – Web Services
Development plan for Service Provider
5) Register new service via UDDI
1) Create the core functionality
2) Create XML-RPC or SOAP service wrapper
3) Create service description file
4) Deploy service
17NOEA 2009Java-kursus – Web Services
Make a WebService with NetBeans
• First install NetBeans EE bundle 5.0 or laterCan be downloaded from www.netbeans.org
• To make a WebService in NetBeans is nearly as easy as in VisualStudio....
18NOEA 2009Java-kursus – Web Services
Live Demo
• Da NetBeans laver om for hver ny version er det bedre med en tutorial fra dem, end screendumps på slides.
• Tutorial for 6+ er her:http://netbeans.org/kb/60/websvc/jax-ws.html