Transcript Developing Applications with SaaS (Software as a Service)

Developing Applications with
SaaS (Software as a Service)
1
B. RAMAMURTHY
4/6/2016
References
2
 http://www.netbeans.org/kb/docs/websvc/zillow.html
 Introduction to Web Services - NetBeans IDE 6.1-6.5
4/6/2016
Web services
3
 Web services are components that expose a software
module for use by distributed applications.
 The operations offered by a service are usually exposed
using one or more interfaces.
 There are two popular programming models available for
interacting with the web services (WS):


REST-based. REpresentational State Transfer is a new way to create and
communicate with web services. In REST, resources have URIs and are
manipulated through HTTP header operations. For more details, see RESTful
Web Services.
SOAP/WSDL-based. In traditional web service models, web service interfaces
are exposed through WSDL documents (a type of XML), which have URLs.
Subsequent message exchange is in SOAP, another type of XML document. For
more details, see SOAP-based Web Services.
4/6/2016
Software as a Service (SaaS)
4
 “SaaS refers to a software application delivery model where a





software vendor develops a web-native software application and
hosts and operates the application for use by its customers over the
Internet. SaaS is an increasingly popular model for providing
software functionality as it is economical in terms of both cost and
customer hardware resources.” ref #1 on slide 2
You can be a consumer of SaaS or provider/vendor of SaaS.
For example, providing a nutritional counseling SaaS.
Consuming the SaaS provided Zillow.
We will work on developing an application that consumes SaaS
offered by Zillow.
“Zillow.com is a Seattle, Washington-based online real estate service
company founded in 2005 by Rich Barton and Lloyd Frink, former
Microsoft executives and founders of Expedia.”
4/6/2016
Steps in SaaS Application Development
5
 Choose the SaaS you want to work with.
 Register yourself with the vendor: sometimes it is free and other times






you may have to pay for using the SaaS (eg. Amazon ECS and S3)
Decide on the model for interaction: REST or SOAP. This is not a big
deal if you are using an IDE since IDE like Netbeans hides the details of
this model and provides a uniform view.
Create a web application that will consume the SaaS.
Create a servlet or JSP to insert the web service request.
Drag and drop the web service request, make sure you initialize the
input parameters to the WS.
Build a front-end (JSP) so that application can be tested with user
defined parameters.
Build a persistent model for storing any data that may be generated
(this is the database component: we will look at this in a future
presentation.)
4/6/2016
Zillow Application
6
 Registering To Receive the Zillow API Key
 Creating the Servlet
 Adding the Zillow GetRegionChart Operation to the




Servlet
Adding the API Key to the Project
Modifying the Servlet to Return the Chart Graphic
Running the Zillow Region Chart Servlet
We will add a JSP as user interface to the above
application so that we can run the application for any
user input.
4/6/2016