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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 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