Servlet Example 3
The Servlet
is setup here to read both the configuration data and the
graph data from a server side processes, in this case a Java
Servlets running on our web server.

and here
is the HTML code,
<img
src="http://localhost:8080/servlet/AreaGraphServlet?
config=http://www.jpowered.com/siriusjava/servlet/AreaConfigServlet&
data=http://www.jpowered.com/siriusjava/servlet/AreaDataServlet"
width="460" height="440">
The
AreaDataServlet ( 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.
The
AreaConfigServlet ( 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 datasources.
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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