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and here is the HTML code,
<img src="http://localhost:8080/servlet/VbarchartServlet?
config=http://localhost:8080/servlet/VbarConfigServlet&
data=http://localhost:8080/servlet/VbarDataServlet"
width="450" height="440">
The VbarDataServlet ( 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 VbarConfigServlet ( 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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