graph chart

Area Graph Examples

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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