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After the user s session has expired, the portlet container will call the
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valueUnbound() method on the user s ChartDeleter object. This method deletes all of the files registered with the ChartDeleter in the temporary directory.
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Portlet Extensions to JFreeChart
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The ServletUtilities class relies on the HttpSession class, which is not available from the portlet API. One of the design decisions made for the portlet API was not to have a way to access an underlying HttpSession from a portlet s PortletSession. Servlets and JSPs deployed in the portlet application use an HttpSession that contains the same data as the PortletSession. We created a PortletUtilities class that is analogous to the ServletUtilities class. The difference is that the saveChartAsPNG() method takes a PortletSession as an argument. The registerChartForDeletion() method also uses a portlet session instead of an HTTP session. You can download the PortletUtilities class from the book s web site, at www.portalbook.com. In our next example, we use the PortletUtilities class.
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Portlet Example with a 3D Pie Chart
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This example displays a 3D pie chart with some expenditures data. The pie chart uses a PieDataset object, which we populated using the setValue() method. Like
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Charting with JFreeChart
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with the bar chart example earlier, we used the ChartFactory class to create our pie chart. One interesting JFreeChart feature we used was the ability to combine small values in a pie data set into a catch-all category called Other. The limitPieDataset() method on the org.jfree.data.DatasetUtilities class takes a pie data set and a cut-off value for small values. In our example, the Recruiting, Turnover, and Corporate Initiatives values were all under 2 percent of the total expenditures. All three were lumped into a slice of the pie called Other:
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package com.portalbook.portlets; import java.io.IOException; import java.io.PrintWriter; import javax.portlet.GenericPortlet; import javax.portlet.PortletException; import javax.portlet.PortletSession; import javax.portlet.RenderRequest; import javax.portlet.RenderResponse; import org.jfree.chart.ChartFactory; import org.jfree.chart.JFreeChart; import org.jfree.data.DatasetUtilities; import org.jfree.data.DefaultPieDataset; import org.jfree.data.PieDataset; import com.portalbook.charting.PortletUtilities; public class ChartingPortlet extends GenericPortlet { public void doView(RenderRequest request, RenderResponse response) throws PortletException, IOException { response.setContentType("text/html"); PrintWriter writer = response.getWriter(); PortletSession session = request.getPortletSession(); PieDataset dataset = createDataset(); //Lower the number of entries in the pie table by combining //the ones that fall under a 2% threshold into "Other" dataset = DatasetUtilities.limitPieDataset(dataset, 0.02);
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14
JFreeChart chart = createChart(dataset); String filename = PortletUtilities.saveChartAsPNG(chart, 400, 300, session); writer.write("<H1>IT Expenditures Chart</H1>"); String chartServlet = request.getContextPath() + "/servlet/DisplayChart"; writer.write( "<IMG SRC='" + chartServlet + " filename=" + filename + "'"); } protected PieDataset createDataset() { DefaultPieDataset dataset = new DefaultPieDataset(); dataset.setValue("Software", 65.2); dataset.setValue("Services", 20.1); dataset.setValue("Hardware", 17.3); dataset.setValue("Network", 18.9); dataset.setValue("Recruiting", 1.3); dataset.setValue("Training", 2.8); dataset.setValue("Turnover", 1.2); dataset.setValue("Corporate Initiatives", 0.5); return dataset; } protected JFreeChart createChart(PieDataset dataset) { JFreeChart chart = null; String title = "IT Expenditures 2003"; chart = ChartFactory.createPieChart3D(title, dataset, true, false, false); return chart; } }
The portlet uses our PortletUtilities class to save the chart to disk as a PNG file. The DisplayChart servlet serves the image to the user. The portlet s content fragment contains an <IMG> HTML element that references the DisplayChart servlet, and passes the servlet a parameter named filename that contains the name of the chart in the temporary file directory. Figure 14-8 shows the third pie chart our portlet creates.
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Figure 14-8. 3D pie chart from the example
Summary
JFreeChart is a very useful component for generating graphs and plots. The basic model is to create a data set with the chart s data. Be sure to use the appropriate Dataset object for your chart type. Next, you create the chart with the ChartFactory class. Finally, you export the chart to the appropriate image format on the hard drive. You can use the JFreeChart servlet functionality for your projects, or you can write your own servlet to serve image files. We used the PortletUtilities class for our example charting portlet. Our portlet created a pie data set, and then consolidated the smaller values in the pie data set into a new data set. The portlet generated the 3D pie chart, and then used the PortletUtilities functionality to save the chart image. We added the DisplayChart servlet to our web.xml web application deployment descriptor for our charting application. Our portlet placed an image tag that pointed to the DisplayChart servlet into its content fragment. We also had to modify the DisplayChart servlet to let it run on our version of Pluto and Tomcat 5.0.25.
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