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The Servlet is setup here to read both the configuration data and the graph
data from server side processes, in this case 2 Java Servlets SVbarConfigServlet and SVbarDataServlet.
and here is the HTML code,
<img src="http://localhost:8080/servlet/SVbarchartServlet?
config=http://localhost:8080/servlet/SVbarConfigServlet&
data=http://localhost:8080/servlet/SVbarDataServlet"
width="450" height="440">
The SVbarDataServlet ( click here to view
code ) is a simple servlet designed to demonstrate how a servlet can be used to return data to either the graphing applet
or servlet. As you will see the main routine ( doGet() ) uses the method GraphData() to construct the return data. Although in
this example the GraphData() routine simply builds the return data from 'hard coded' values, in practice this routine would be
expanded to first gather data from any number of data sources. eg. databases, files other server processes.
The SVbarConfigServlet ( click here to view
code ) again is just a simple servlet to demonstrate the method. The routine ConfigData() is used to construct the return
data from 'hard coded' values. Again, in practice this method would be expanded to derive data from a number of data sources.
There are various methods by which the graphing servlet can be set to acquire
data from databases including:-
Direct Database Binding
Database Script Interface
For a full discussion on the various methods and example scripts please see the
Tutorial section - click here.
For a full explanation of and range of values for the above parameters please
see the Documentation - Configuration Options».
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