JFreeChart示例

package org.hz.util;import org.jfree.chart.ChartFactory;import org.jfree.chart.JFreeChart;import org.jfree.chart.axis.CategoryAxis;import org.jfree.chart.axis.CategoryLabelPositions;import org.jfree.chart.plot.CategoryPlot;import org.jfree.chart.plot.PlotOrientation;import org.jfree.chart.renderer.category.BarRenderer3D;import org.jfree.data.category.CategoryDataset;import org.jfree.data.category.DefaultCategoryDataset;public class FreeChartUtil{public static CategoryDataset createDataset()  {    DefaultCategoryDataset localDefaultCategoryDataset = new DefaultCategoryDataset();    localDefaultCategoryDataset.addValue(10.0D, "Series 1", "Category 1");    localDefaultCategoryDataset.addValue(4.0D, "Series 1", "Category 2");    localDefaultCategoryDataset.addValue(15.0D, "Series 1", "Category 3");    localDefaultCategoryDataset.addValue(14.0D, "Series 1", "Category 4");    localDefaultCategoryDataset.addValue(-5.0D, "Series 2", "Category 1");    localDefaultCategoryDataset.addValue(-7.0D, "Series 2", "Category 2");    localDefaultCategoryDataset.addValue(14.0D, "Series 2", "Category 3");    localDefaultCategoryDataset.addValue(-3.0D, "Series 2", "Category 4");    localDefaultCategoryDataset.addValue(6.0D, "Series 3", "Category 1");    localDefaultCategoryDataset.addValue(17.0D, "Series 3", "Category 2");    localDefaultCategoryDataset.addValue(-12.0D, "Series 3", "Category 3");    localDefaultCategoryDataset.addValue(7.0D, "Series 3", "Category 4");    localDefaultCategoryDataset.addValue(7.0D, "Series 4", "Category 1");    localDefaultCategoryDataset.addValue(15.0D, "Series 4", "Category 2");    localDefaultCategoryDataset.addValue(11.0D, "Series 4", "Category 3");    localDefaultCategoryDataset.addValue(0D, "Series 4", "Category 4");    localDefaultCategoryDataset.addValue(-8.0D, "Series 5", "Category 1");    localDefaultCategoryDataset.addValue(-6.0D, "Series 5", "Category 2");    localDefaultCategoryDataset.addValue(10.0D, "Series 5", "Category 3");    localDefaultCategoryDataset.addValue(-9.0D, "Series 5", "Category 4");    localDefaultCategoryDataset.addValue(9.0D, "Series 6", "Category 1");    localDefaultCategoryDataset.addValue(8.0D, "Series 6", "Category 2");    localDefaultCategoryDataset.addValue(0D, "Series 6", "Category 3");    localDefaultCategoryDataset.addValue(6.0D, "Series 6", "Category 4");    localDefaultCategoryDataset.addValue(-10.0D, "Series 7", "Category 1");    localDefaultCategoryDataset.addValue(9.0D, "Series 7", "Category 2");    localDefaultCategoryDataset.addValue(7.0D, "Series 7", "Category 3");    localDefaultCategoryDataset.addValue(7.0D, "Series 7", "Category 4");    localDefaultCategoryDataset.addValue(11.0D, "Series 8", "Category 1");    localDefaultCategoryDataset.addValue(13.0D, "Series 8", "Category 2");    localDefaultCategoryDataset.addValue(9.0D, "Series 8", "Category 3");    localDefaultCategoryDataset.addValue(9.0D, "Series 8", "Category 4");    localDefaultCategoryDataset.addValue(-3.0D, "Series 9", "Category 1");    localDefaultCategoryDataset.addValue(7.0D, "Series 9", "Category 2");    localDefaultCategoryDataset.addValue(11.0D, "Series 9", "Category 3");    localDefaultCategoryDataset.addValue(-10.0D, "Series 9", "Category 4");    return localDefaultCategoryDataset;  }  public static JFreeChart createChart(CategoryDataset paramCategoryDataset)  {    JFreeChart localJFreeChart = ChartFactory.createBarChart3D("3D Bar Chart Demo", "Category", "Value", paramCategoryDataset, PlotOrientation.VERTICAL, true, true, false);    CategoryPlot localCategoryPlot = (CategoryPlot)localJFreeChart.getPlot();    localCategoryPlot.setOutlineVisible(false);    localCategoryPlot.setDomainGridlinesVisible(true);    CategoryAxis localCategoryAxis = localCategoryPlot.getDomainAxis();    localCategoryAxis.setCategoryLabelPositions(CategoryLabelPositions.createUpRotationLabelPositions(0.39269908169872414D));    localCategoryAxis.setCategoryMargin(0D);    BarRenderer3D localBarRenderer3D = (BarRenderer3D)localCategoryPlot.getRenderer();    localBarRenderer3D.setDrawBarOutline(false);    return localJFreeChart;  }}

Servlet

package org.hz.servlets;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.hz.util.FreeChartUtil;import org.jfree.chart.ChartUtilities;/** * Servlet implementation class FreeChartServlet */public class FreeChartServlet extends HttpServlet {private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public FreeChartServlet() {        super();        // TODO Auto-generated constructor stub    }/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubreFreeChartUtil u=new FreeChartUtil();ChartUtilities.writeChartAsJPEG(response.getOutputStream(), u.createChart(u.createDataset()), 640, 400);}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubthis.doGet(request, response);}}

图表示例之一，文档中还有更多示例