JFreeChart map generated popular among hungry students

Abstract: JFreeChart map generated popular among hungry students

</ Td> </ tr> <tr> <td height="35" valign="top" class="ArticleTeitle"> decompress documents jfreechart-0.9.11 directory and the jfreechart-lib 0.9.11.jar / jcommon-0.8.6.jar, lib / gnujaxp.jar are required for the operation of the development of the document, these three documents available to the application lib directory.

<table Width="676" border="0"> <tr> <td width="399"> web.xml file and then add the following:

DisplayChart
Org.jfree.chart.servlet.DisplayChart

DisplayChart
/ Servlet / DisplayChart
</ Td> <td width="267"> </ td> </ tr> </ table>
Test code:
<% @ Page contentType = "text / html; GBK charset ="%>
<% @ Page import = "org.jfree.data.DefaultPieDataset"%>
<% @ Page import = "org.jfree.chart.JFreeChart"%>
<% @ Page import = "org.jfree.chart.plot.PiePlot"%>
<% @ Page import = "org.jfree.chart.ChartRenderingInfo"%>
<% @ Page import = "org.jfree.chart.servlet.ServletUtilities"%>
<% @ Page import = "org.jfree.chart.urls.StandardPieURLGenerator"%>
<% @ Page import = "org.jfree.chart.entity.StandardEntityCollection"%>
<%

DefaultPieDataset data = new DefaultPieDataset ();
Data.setValue ( "June", 500);
Data.setValue ( "July", 580);
Data.setValue ( "August", 828);

PiePlot plot = new PiePlot (data);

JFreeChart chart = new JFreeChart ( "", JFreeChart.DEFAULT_TITLE_FONT, plot, true);
Chart.setBackgroundPaint (java.awt.Color.white); / / optional, and set the background color picture
Chart.setTitle ( "TAB ");// www.SenTom.net optional site visits, set up title picture

ChartRenderingInfo info = new ChartRenderingInfo (new StandardEntityCollection ());
/ / Length of 500 pictures, 300 is a high degree of picture

String filename = ServletUtilities.saveChartAsPNG (chart, 500, 300, info, session);
String graphURL = request.getContextPath () + "/ servlet / DisplayChart? Filename =" + filename;
Out.println (filename + "
");
Out.println (graphURL);

%>

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