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Creating & Consuming Web Services

Creating & Consuming Web Services. MIS 424 Professor Sandvig. Overview – Web Services. What are Web Services? Benefits Who is using them Using in .NET How to create How to consume. What are Web Services?. Web services allow applications to communicate with each other via Internet

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Creating & Consuming Web Services

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  1. Creating & Consuming Web Services MIS 424 Professor Sandvig

  2. Overview – Web Services • What are Web Services? • Benefits • Who is using them • Using in .NET • How to create • How to consume

  3. What are Web Services? • Web services allow applications to communicate with each other via Internet • Islands of data • Huge databases • Every large organization • Can’t communicate, share • Between organizations • Within organizations

  4. What are Web Services? • Underlying Technologies • XML • Defines data content • SOAP • Simple object access protocol • Protocol  rules • Advantage • HTTP: name-value pairs • SOAP: • data relationships • Data types • Both are W3.org standards • Supported by all major vendors

  5. Why Now? • Historically • Physical distance • Small data pipelines • Now • Internet, fiber optics, … • Distance not a problem • Recent: mid-1990’s • Limitation • Need common language & protocols • Solution • Web Services: XML & Soap

  6. Who is using? • Amazon • Retrieve shipping info • Expose product database • UPS • Shipping status, pricing information, etc. • Google • Expose database • Tap creativity of programmers • Ideas for free • Others?? • Difficult to tell, background process Overstock.com web site

  7. Using Web Services in .NET Web Service Namespaces • Implements XML & SOAP technologies • Dozens of classes • High level • Handle messy details • MSDN Documentation • Heavily promoted functionality of .NET

  8. Using Web Services • Two roles: • Create • Expose your data/application to other • Consume • Utilize web services offered by others

  9. Creating Web Services • Visual Studio: • Add new item: Web Service • .asmx file

  10. Creating Web Service Default .asmx file:

  11. Creating Web Services • Example: • Testing • Via HTTP • Request .asmx file • CreateWebService.asmx, (source .doc)

  12. Consuming Web Service • Create proxy • Visual Studio • Add service reference… • Paste in web service description language (wsdl) • VS creates classes that utilize service • Use like any other classes

  13. Consuming Web Service • Visual Studio • Paste web service URL

  14. Consuming Web Service • WSDL returns service description: • Give descriptive name and click OK

  15. Consuming Web Service • Visual Studio creates class (proxy) representing web service • Adds info to web.config

  16. Consuming Web Services • Service now represented by class • Service methods visible via Intellisense

  17. Consuming Web Service • Example: • ConsumeWebService.aspx • .asmx files can handle AJAX calls • See assignment 4 • ObjectDataSource control: • Use VS wizard to select web service class

  18. Summary – Web Services • Allow applications to communicate • Connect islands of data • Based upon W3 standards • .NET support • Very easy to publish & consume

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