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Web Services. “ A software system designed to support interoperable Machine to Machine interaction over a network“. “ Web based application that use s open, XML-based standards and transport protocols to exchange data with clients ”. Kas ir Web servisi?. Eksistē daudz dažādas definīcijas ….

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Kas ir web servisi

A software system designed to support interoperable Machineto Machineinteraction over a network“

“Web based application that uses open, XML-based standards and transport protocols to exchange data with clients”

Kas ir Web servisi?

Eksistē daudz dažādas definīcijas…

W3c defin cija
W3C definīcija

A Web service is a software application

identified by a URI,

whose interfaces and binding are

capable of being defined, described and

discovered by XML artifacts and

supports direct interactions with other

software applications

using XML based messages

via internet-based protocols

Citiem v rdiem
Citiem vārdiem...

  • Web serviss ir programmatūra, kas ir identificējama tīmeklī pēc URI, kurai klienti piekļūst izmantojot uz XML balstītu protokolu (SOAP), kurš tiek izmantots virs Internet protokola (HTTP)

  • Klienti piekļūst Web servisa programmai caur tas interfeisiem un saistībām (bindings), kuri ir definēti izmantojot XML artefaktus (WSDL)

No biznesa skatiena
No biznesa skatiena...

  • Web Services: A distributed or virtual applications or processes that use the Internet to link activities or software components.

  • A travel Web site that:

    • takes a reservation from a customer,

    • sends a message to a hotel application, accessed via the Web, to determine if a room is available,

    • books it,

    • tells the customer he or she has a reservation

      is an example of a Web Services application.

“Business Process Trends” http://www.bptrends.com/resources_glossary.cfm?letterFilter=W&displayMode=all

Web servisu raksturojums
Web servisu raksturojums

  • XML based everywhere

  • Message-based

  • Platform and programming language independent

  • Could be dynamically located

  • Could be dynamically assembled or aggregated

  • Accessed over the Internet

  • Loose coupling between invoker and service

  • Based on industry standards

Web servisu att st ba
Web servisu attīstība

  • Web servisu attīstības fāzes:

    • Phase 1 (1999-2001)

      • Simple

      • Business-to-Consumer (B2C)

    • Phase 2 (2002-2004)

      • Enterprise Application Integration (EAI)

      • Private UDDI Registries

    • Phase 3 (2005-...)

      • Business-to-Business (B2B)

      • Public UDDI Registries

  • [W3C] Web Services Activity: History


Web servisu standarti
Web servisu standarti

  • Common markup language for communication

    • XML (eXtensible Markup Language)

  • Common message format for exchanging information

    • SOAP (Simple Object Access Protocol)

  • Common service specification formats

    • WSDL (Web Services Description Language)

  • Common means for service lookup

    • UDDI (Universal Description, Discovery, and Integration)

Web services big picture

Service Discovery

Service Description

XML Messaging

Service Transport

Web Services Big Picture

  • Service Discovery

    • UDDI

  • Service Description

    • WSDL

  • XML Messaging

    • SOAP and XML-RPC

  • Service Transport

    • HTTP, SMTP, FTP etc.

The Protocol Stack

Web servisu mijiedarb ba
Web servisu mijiedarbība

Web servisi un Web servisu klienti sadarbojas izmantojot SOAP, WSDL, UDDI tehnoloģijas

Pamata specifik cijas
Pamata specifikācijas

  • Pamata specifikācijas ir apvienotas WS-I profilā

  • WS-I = Web Services Interoperability

  • Svarīgākas WS-I specifikācijas:

    • WS-I Basic Profile

    • Simple Soap Binding Profile

    • Basic Security Profile

  • Papildus WS-I piedāvā:

    • Sample Applications

    • Testing Tools

Papildus specifik cijas
Papildus specifikācijas

Dažas specifikācijas bija izstrādātas, lai paplašināt Web servisu spējas un ir apvienotas WS-* profilā

  • WS-Security

  • WS-Reliability

  • WS-ReliableMessaging

  • WS-Addressing

  • WS-Transaction


  • vēl daudz citas...

Java ee web services
Java EE & WebServices

Java ee web services1
Java EE & WebServices

  • J2EE community has defined overall framework for Web Services in J2EE 1.4 (JSR 109)

  • Java EE 5 accelerates and radically simplifies Enterprise Java development, especially for Web Services

  • The Java EE platform provides a complete framework for developing and deploying Web Services on the Java platform

Java ee tehnolo ijas
Java EE tehnoloģijas

Primāras Java EE 5 platformas tehnoloģijas:

  • Java API for Web Services (JAX-WS) 2.0

  • Java API for XML-Based RPC (JAX-RPC) 1.1

  • Java Architecture for XML Binding (JAXB) 2.0

  • SOAP with Attachments API for Java (SAAJ)

  • Streaming API for XML (StAX)

  • Web Service Metadata for the Java Platform

Web servisu veidi
Web servisu veidi

Web servisu izmantošanas stili:

  • RPC = Remote procedure calls

    • A distributed function (or method) call interface

  • SOA = Service-oriented architecture

    • Basic unit of communication is a message, rather than an operation

  • RESTful = Representational state transfer

    • An attempt to emulate HTTP and similar protocols by constraining the interface to a set of well-known, standard operations (e.g., GET, PUT, DELETE)

Web servisu mijiedarb bas veidi
Web servisu mijiedarbības veidi

  • Sinhroni web servisi

    • Klienti sūta pieprasījumu servisam un pārtrauc savu darbību kamēr gaida atbildi

    • RPC-oriented approach

    • JAX-RPC servlet endpoint

  • Asinhroni web servisi

    • Klienti inicializē servisa pieprasījumu un turpina savu darbību negaidot atbildi

    • Document-oriented approach

    • JAX-RPC servlet endpoint + JMS + EJB


  • “Big Web Services”

    • Traditional enterprise Web services

    • SOAP & WSDL

  • “Lighter-weight Web Services”

    • RESTful approach

    • Web API (feature of Web 2.0)

    • Mashups


  • REST (Representational State Transfer)

    is a key design idiom that embraces a stateless client-server architecture in which the web services are viewed as resources and can be identified by their URLs

  • The definition of RESTful web service consists of

    • The base URI for the web service (http://example.com/resources/)

    • The MIME type of the data supported by the web service

      • e.g. JSON, XML, YAML

    • The set of operations supported by the web service using HTTP methods

      • e.g. POST, GET, PUT, DELETE


Web api

  • Web APIs are functionalities made available by websites to their users or visitors in a programmatically way

  • Developers can use these Web APIs and enrich their applications with useful functions from third parties

  • Web API is a new direction to follow by W3C in a new working group: Web APIs Working Group


Web api1

  • Some of the most well-known web APIs are

    • Google Maps or Google Search

    • Yahoo Maps or Yahoo Search

    • eBay API

    • Amazon API

    • Paypal API

    • Skype API

    • and many more

  • Some links:

    • http://www.programmableweb.com/apis

    • http://www.webapi.org

    • http://www.w3.org/2006/webapi/


  • Mashup is a web page or application that combines data or functionality from two or more external sources to create a new service

  • Easy, fast integration, frequently using open APIs and data sources

  • Types of mashups:

    • consumer mashups

    • data mashups

    • enterprise mashup

Spring web services
Spring Web Services

  • Spring Web Services (Spring-WS)

    is a product of the Spring community focused on creating document-driven Web services

  • Aims to facilitate contract-first SOAP service development (as opposed to contract-last approach)



  • Web services provides a new paradigm for program to program communication

  • Web services standards are XML, SOAP, WSDL and UDDI

  • Comprehensive set of Java APIs for Web services is available!

  • Java EE is the platform of choice for Web services


  • Java Web Services At a Glancehttp://java.sun.com/webservices/index.jsp

  • Book “J2EE Web Services” by Richard Monson-Haefel


  • Web Service Interaction Architectures



  • JBoss Web Services


  • Spring Web Services


  • Java Web Services Overview Presentationhttp://www.javapassion.com/webservices/WebServicesOverview.pdf

  • Another Java Web Services Overview Presentationhttp://www.dma.unina.it/~murli/GridSummerSchool2004/presentations/Fox/background/WebServicesOverview.pdf


  • Services Mashups: The New Generation of Web Applications