The document outlines a training agenda on Java/J2EE programming with a focus on web services, covering topics such as interoperability, XML, UDDI, SOAP, and WSDL. It introduces the concepts of web service contracts versus services, provides examples of web service implementation in Java, and explains the process of converting Java to SOAP messages. Additionally, it highlights the importance of web services in enabling communication over the internet.

1. Java/J2ee Programming Training
Java Web Services

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Agenda
• Intoduction to WebServices
• Interoperability
• XML
• UDDI – Universal discovery description and Integration
• Conversion—java to soap message
• Writing a web service
• Contract vs service
• WSDL generation

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WEB SERVICES
SOAP
JAX-JS
REST
JAS-RS
Introduction to Web Services

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Web Services
• available over internet
• consumed by application

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Interoperability
JAVA WEB
SERVICE
.NET WEB
SERVICE
C++

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Web Services
getProducts()
MVC
getProducts.jar

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Terms
webservice Implinterfaceconsumer
webservice Implinterfaceconsumer

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XML
• WSdl-web service definition language
• contract definition of webservice
• shared with consumers
---java interface in xml format.

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UDDI – Universal discovery description and Integration
• locates web service.
• can query the directory to fetch the service.
CLIENTS UDDI
service

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SOAP: simple access object protocol
JAVA WSDL WEBSERVICE
JAVA
XML
======
SOAP
WEBSERVICE
SOAP: simple access object protocol

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Conversion—Java to SOAP message
• service end point( SEI)—acts as an interface to service end point
• converts java code to soap message
SEI
WEB SERVICE
SOAP
=====
XML

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Writing a web service
@Webservice
class BookTickets
{
public List<String> getShowNames()
{
List<String> shows = new ArrayList<>();
shows.add( “abcd”);
shows.add(“ppp”);
show.add(“qqq”);
}
}

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Contract vs Service
• Contract ---interface
• service – business logic
• most of the time we write the interface

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WSDL Generation
WSDL
WEB_SE
RVICE

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<service name="BookTicketsService">
<port name="BookTicketsPort" binding="tns:BookTicketsPortBinding">
<soap:address location="http://aatika-pc:31820/WebServiceEx/BookTicketsService"/>
</port></service>

16. WSDL

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Thank You