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Overview of Web Services

This article provides an overview of web services, including their definition, benefits, drawbacks, architecture, communication process, tools, and implementation. It also discusses the different web services development platforms and references for further information.

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Overview of Web Services

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  1. Overview of Web Services Maria Lizarraga CS526

  2. Agenda • Definition • Benefits/Drawbacks • Architecture • Communication Process • Tools • Implementation Maria Lizarraga

  3. What is a web service? • A web service is a web software application available on the network that provides an interface for exchanging information with a client. • the software application • a method to interface to the application • URI associated with the application • a published document that gives visibility to the world Maria Lizarraga

  4. Benefits • Platform and Language Independent • Uses industry standards • Low cost internet communication • Reduces development effort Maria Lizarraga

  5. Drawbacks • Less efficient, slow • Hard to locate • Requires learning a different set of development tools and technology Maria Lizarraga

  6. Architecture Maria Lizarraga

  7. Web Services Description Language (WSDL) Document • Name • Location • Operations • Data Types See WSDL document. Maria Lizarraga

  8. Universal Description, Discovery, and Integration (UDDI) Registry • Publish Web Services • Discovering Web Services Maria Lizarraga

  9. Simple Object Access Protocol, SOAP Message • XML • Embedded into HTTP • Three parts • Envelope • Header • Body Maria Lizarraga

  10. Communication Process Maria Lizarraga

  11. Client Application Maria Lizarraga

  12. SOAP Message POST /GradesService/services/GradesService HTTP/1.0 Content-Type: text/xml; charset=utf-8 Accept: application/soap+xml, application/dime, multipart/related, text/* User-Agent: IBM WebServices/1.0 Host: localhost:9080 Cache-Control: no-cache Pragma: no-cache SOAPAction: "" Content-Length: 356 <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/ envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/ encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema- instance"> <soapenv:Body> <getStudents xmlns="http://grades"/> </soapenv:Body> </soapenv:Envelope> Application package grades; public class GradesService { final int NUMSTUDENTS = 4; String[] students; char[] grade; public GradesService ( ) { students = new String [] {"Mary", "Joe", "Sally", "Tim"}; grade = new char [] {'A', 'B', 'C', 'D'}; } // end constructor public char getStudentGrade (String student) { for (int i = 0; i < NUMSTUDENTS; i++) if (student.equals(students[i])) return grade[i]; return 'Z'; } // end getStudentGrade public String getStudent (int studentID) { return students[studentID]; } // end getStudent public String[] getStudents ( ) { return students; } // end getStudents public static void main(String[] args){ GradesService gs = new GradesService(); for (int i = 0; i < gs.NUMSTUDENTS; i++) System.out.println("Student: " + gs.getStudent (i) + "\tGrade:” + gs.getStudentGrade(gs.getStudent(i))); } // end main } // end class GradesService Request Maria Lizarraga

  13. HTTP/1.1 200 OK Server: WebSphere Application Server/5.1 Content-Type: text/xml; charset=utf-8 Content-Language: en-US Connection: close <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <soapenv:Body> <getStudentsResponse xmlns="http://grades"> <getStudentsReturn> Mary </getStudentsReturn> <getStudentsReturn> Joe </getStudentsReturn> <getStudentsReturn> Sally </getStudentsReturn> <getStudentsReturn> Tim </getStudentsReturn> </getStudentsResponse> </soapenv:Body> </soapenv:Envelope> Response Maria Lizarraga

  14. Web Services Development Platforms • Java Web Services Development Pack (JWSDP) • IBM WebSphere • Systinet Web Applications and Services Platform (WASP) • Microsoft.NET • HP Web Services Platform Maria Lizarraga

  15. WebSphere Implementation • Create an application • Create a server • Create a project • Create a service • Test the service • Create the client • Test the client • Publish the service Maria Lizarraga

  16. Summary • Architecture • UDDI Registry, Client and Server Applications • WSDL • SOAP • Communication Process • Application -> Stub -> Runtime -> SOAP Message • Soap Message -> Runtime -> Ties -> Application • Web Services Development Platforms Maria Lizarraga

  17. References • IBM WebBench, http://www-306.ibm.com/software/websphere/ • The Java Web Services Tutorial 1.0, August 7, 2002, http://java.sun.com/webservices/docs/1.0/tutorial/ • Web Services Description Language (WSDL) 1.1, http://www.w3.org/TR/wsdl • UDDI web site, http://www.uddi.org • SOAP Tutorial, http://www.w3schools.com/soap • Deploying Web services with WSDL: Part 1, Bilal Siddiqui, http://www-106.ibm.com/developerworks/library/ws-intwsdl/ Maria Lizarraga

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