java webservices final

7/28/2019 Java WebServices Final

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: 50 , 20 ,10 - / ,


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WEB SERVICES

The worldbefore

AGENDA

Situation

Problems

Solutions


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Problems

SolutionsEB SERVICES

The worldbefore

Situation

The World Before Web Services

Org

A

System A

System B

System C

Org

BSystem A

System B


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SolutionsSolutionsEB

SERVICES

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The World Before Web Services

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System A

System B

System C

Org

BSystem A

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Another Better Solutions


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WEB SERVICES

The worldbefore

Situation

Problems

Solutions

Motiv. forWeb Services

Probs. withCurr. sols.

Web ServicesSolution

AGENDA


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WEB SERVICES

The worldbefore

Situation

Problems

Solutions




Problems with current solutions

Involve a whole learning curve

Not based on standardized rules and specifications

ModuleA

ModuleB

ModuleC

ModuleB

ModuleA

CORBA

CORBACORBA

RMI


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WEB SERVICES

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Web Services

Standardized method of communication betweensoftware applications

Provide

ModuleB

ModuleA

C++ Java

Distributed components are interfacedvia non-object-specific protocols


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LEADING with Domain-Specific IT Solutions

Fund. OfWeb Services

WEB SERVICES

The worldbefore

Situation

Problems

Solutions




+ve and -ve ofWeb Services

Fundamentals of WSDL

WSDL

ServiceImplementation

Web Service Interface(WSDL)

Types

Message

Operation

Port Type

Binding

Port

Service


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Copyright 2012 Headstrong Confidential and Proprietary Information | www.headstrong.com

What is a Web Service A web service is a piece of business logic, located

somewhere on the Internet, that is accessiblethrough standard-based Internet protocols such asHTTP or SMTP.

OR A web service is just a web page meant for acomputer to request and process.


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Charaterstics of a Web Service

XML-based information exchangesystems that is useful for direct application-to-application interaction.

With Web services you can exchangedata between different applications and

different platforms.Interoperability among distributed

applications that span diverse hardwareand software platforms

Use of Standard protocols andspecification enables integration with Other Messaging Systems, Legacy Systems, etc.

Seamless Integration of B2B applicationsLoosly Coupled


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Components of a Web Service

WSDL-Web Service Description LanguageSOAP-Simple Object Access ProtocolUDDI- Universal Description, Discovery and Integration (UDDI)

SOAP Message ProtocolSOAP provides a simple and lightweight mechanism for exchanging structured and typed information between peers in adecentralized, distributed environment using XML

WSDL Service DescriptionWeb Services Description Language (WSDL) is an XML format for describing Web services. WSDL enables one toseparate the description of the abstract functionality offered by a service from concrete details of a service descriptionsuch as "how" and "where" that functionality is offered.

UDDI Service RegistryThe Universal Description, Discovery and Integration (UDDI) specification defines a standard way to describe a Webservice; register a Web service in a well-known registry; and discover other registered Web services.


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WSDL

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W S D L a r c h i t e c t u r e Web Services Description Language (WSDL) filesare written in Extensible Markup Language (XML). WSDL is one alternative to make service interfaces andimplementations available in the UDDI registry.WSDL includes the workflow description (business

process execution language for Web services,BPEL4WS)WSDL is the base for SOAP server deployment and

SOAP client generation. A WSDL file contains the following parts:

Web service interface definition This is part contains the elements, as

well as the namespaces.Web service implementation This part contains the definition of theservice and ports.

The following is the structure of the information in a WSDLfile : A WSDL file


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WSDL-Components

WSDL Layers:-1.Service definition layer describes abstract properties:-Data types

-Message types-Operations-Services

2. The binding layer describes concrete properties:-Protocols-Data formats (using SOAP, HTTP, MIME)

Components :- types - containing XML Schema element and type definitions

message - consisting of either ?a number of named parts typed by XML Schema elements, or a single part typed by a XML Schema type

portType - describing a set of operations, each being either ?one-way: receiving an input message,request-response : receiving an input message and then responding with an output message (like Remote Procedure Calls),solicit-response : sending an output message and then receiving an input message, or notification : sending an output message

binding - selects communication protocol and data formats for each operation and message

service - describes a collection of named ports, each associated with a binding and a network address An import mechanism allows modularization of definitions.


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WSDL Components Contd..

The services and ports define the location of the Web service Service

The service contains the Web service name and a list of ports. Ports

The ports contain the location of the Web service and the bindingused for service access.


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1. Create a Dynamic Web Project

2.Create Web Service Provider Java Class

3. Create a Web Service

4. Test Web Service

Creation of Web service using Eclipse


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Creation of Web service using Eclipse

1. Create a Dynamic Web Project

2.Create Web Service Provider Java Class

3. Create a Web Service

4. Test Web Service


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java webservices final

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