Interoperability between heterogeneous applications using Web Services

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Interoperability between heterogeneous
applications using Web Services

• by
• Esther Shailaja Campbell
• Advisor Dr. Stewart Shen
• Student ID _at_00066220
• Email epakalap_at_cs.odu.edu

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Presentation Features

• Objective
• Modules
• Web Service WSDL
• Architecture
• Creating Consuming Web Services
• Scenario
• Demo
• Future work
• QA

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Project Objective

• The main Objective of this project is to
  demonstrate Interoperability between Java and
  .Net applications using Web Services

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Software used

• Java application Apache Tomcat Web Server, Java,
  JSP, Servlets, Apache Axis SOAP, WSDL2Java
  Java2WSDL tools etc and MySQL Database
• .Net Application IIS Web Server, ASP.Net, C,
  Microsoft Visual studio 2003 Web Service, Web
  Reference, WSDL compiler and XML Database
• Common Standards SOAP, HTTP, XML WSDL

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Modules

• Java Application
• .Net Application
• Web Services

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Java Application(Laptops Online)

• Components
• Uses MVC Model
• Displays list of products
• Shopping cart
• Customer and Billing information
• Confirm order by email
• Access .Net web service to show shipment status

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Java Application Architecture
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.Net Application(Shipment tracking System)

• Components
• View Records
• Insert/updates the shipping status information
• Search for Current status
• Generates planned route and sends it to customer
  email
• Search for route with timestamp
• Receives new records by accessing Java web
  service

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.Net Application Architecture
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Web Services

• 1. Network accessible programs
• 2. Expose functionality by receiving/sending
  SOAP messages over HTTP/HTTPS,
• 3. Describe interface as WSDL descriptions.
• WSDL is the description language for Web services
  
• WSDL is an XML-based language for describing Web
  services and how to access them.
• A WSDL document describes
• What the service can do
• Where it resides
• How to invoke it

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WSDL Document Structure
WSDL doc
lttypesgt
ltmessagesgt
ltporttypesgt
ltbindingsgt
ltservicesgt
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A request-response operation example

• ltmessage name"getTermRequest"gt
• ltpart name"term" type"xsstring"/gt
• lt/messagegt
• ltmessage name"getTermResponse"gt
• ltpart name"value" type"xsinteger"/gt
• lt/messagegt
• ltportType name"glossaryTerms"gt ltoperation
  name"getTerm"gt ltinput message"getTermReque
  st"/gt ltoutput message"getTermResponse"/gt
  lt/operationgtlt/portTypegt
• ltbinding type"glossaryTerms" name"b1"gt
• ltsoapbinding stylerpc transport"http//sche
  mas.xmlsoap.org/soap/http" /gt ltoperationgt
• ltsoapoperation soapAction"http//example
  .com/getTerm"/gt
• ltinputgt
• ltsoapbody use"literal"/gt
• lt/inputgt
• ltoutputgt
• ltsoapbody use"literal"/gt
• lt/outputgt
• lt/operationgt
• lt/bindinggt

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App2App Interaction Web Services

• Transport protocol
• HTTP/HTTPS
• Data Encoding
• SOAP (Simple Object Access Protocol)
• Interface Description
• WSDL (Web Services Description Language)

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Architecture

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Creating Java Web Service

• Create an interface and an implementation class
• Java2WSDL Generate the WSDL file for the given
  java web service interface.
• WSDL2Java Generate the server side wrapper code,
  and stubs for client access.
• JavawebservSoapBindingImpl Fill in wrapper to
  call the existing code.
• Deploy Deploy the service to Apache Axis.
• Client Write a client that uses the generated
  stubs, to access the Web service.

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Creating .Net Web Service

• .Net Web Service can be created using Microsoft
  Visual Studio .Net 2003 software.
• In the File menu select Add new item and select
  the web service option and define the web methods
  to access the data.

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Consuming Java web service from .Net application

• In the visual studio software, in the Project
  menu select Add web reference option
• In the url box enter the wsdl file path of the
  java web service for example http//localhost812
  3/axis/services/laptop.wsdl
• When the url is entered it gives the list of
  methods in the service eg getOrderId,
  getLocation etc
• Click Add web reference and your web service is
  ready to be accessed
• To access this web service a proxy client is
  created. For that we need the wsdl file of that
  particular web service
• Use the WSDL compiler of the .net framework to
  generate the cs file.
• Now add this cs file, which is the proxy class
  for the referenced web service to your .Net
  application.
• By making the instance to this proxy client we
  can call the Java web service

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Consuming .Net web service from Java application

• Create a .Net web service (Service.asmx)
• Use WSDL2Java tool to generate the server side
  wrapper code, and stubs for client access.
• gtjava WSDL2Java Service.asmx?WSDL
• Write a java client that uses the generated
  stubs, to access the Web service.
• By making the instance to this proxy client we
  can call the .Net webservice.
• And data can be accessed and displayed.

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Demo Scenario
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Demo Shipment Locations(15 US major cities)
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Future Work

• Service Description and Discovery
• UDDI (Universal Description, Discovery and
  Integration)
• Security
• WS-Security, XML-Signature, XML-Encryption, ...

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Thank You

• Q A