Servlet Example 2
The servlet
is setup here to read the configuration data from a text file
and the graph data from a server side process, SHbarDataServlet.
Please Note: In order for the Graphing Servlet to
produce the image below, a Servlet Runner must be running
on your local machine - see beginning
of this section.
and here
is the HTML code,
<img src="http://localhost:8080/servlet/SHbarchartServlet?
config=http://www.jpowered.com/bar_graph/shbarchart/Examples/barprops.txt&
data=http://localhost:8080/servlet/SHbarDataServlet"
width="450" height="440">
The
SHbarDataServlet ( 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 datasources. eg.
databases, files other server processes.
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 dicussion on the varius methods and example
scripts please see the
Tutorial section - click here.
Note:
If you are using the evaluation version then in the applet
a pop-up window will appear upon the startup and an evaluation
message will be incorporated by the servlet. Both these features
have been removed from the licensed version. Licensing information
can be found at http://www.jpowered.com/graph_chart/index.htm
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