jfreechart初步
package com.xmddl.jfreechart;import java.awt.Color;import java.awt.Font;import java.io.IOException;import java.sql.Connection;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.jfree.chart.ChartFactory;import org.jfree.chart.ChartUtilities;import org.jfree.chart.JFreeChart;import org.jfree.chart.axis.AxisLocation;import org.jfree.chart.axis.CategoryAxis;import org.jfree.chart.axis.ValueAxis;import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;import org.jfree.chart.plot.CategoryPlot;import org.jfree.chart.plot.PlotOrientation;import org.jfree.chart.renderer.category.BarRenderer3D;import org.jfree.chart.renderer.category.StackedBarRenderer3D;import org.jfree.data.category.DefaultCategoryDataset;import org.jfree.data.general.DefaultPieDataset;import org.jfree.data.jdbc.JDBCXYDataset;import com.xmddl.common.DBService;public class JFreeChartServlet1 extends HttpServlet {static Connection con = DBService.getInstance().getConnection();/** * */private static final long serialVersionUID = 1L;/** * Constructor of the object. */public JFreeChartServlet1() {super();}/** * Destruction of the servlet. <br> */public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}/** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("image/jpeg");DefaultCategoryDataset data = getDataSet();JFreeChart chart = ChartFactory.createStackedBarChart("水果销量图统计", null,null, data, PlotOrientation.VERTICAL, true, false, false);chart.setBackgroundPaint(Color.WHITE);CategoryPlot plot = chart.getCategoryPlot();CategoryAxis domainAxis = plot.getDomainAxis();// domainAxis.setVerticalCategoryLabels(false);plot.setDomainAxis(domainAxis);ValueAxis rangeAxis = plot.getRangeAxis();// 设置最高的一个 Item 与图片顶端的距离rangeAxis.setUpperMargin(0.15);// 设置最低的一个 Item 与图片底端的距离rangeAxis.setLowerMargin(0.15);plot.setRangeAxis(rangeAxis);// BarRenderer3D renderer = new BarRenderer3D();StackedBarRenderer3D renderer = new StackedBarRenderer3D();renderer.setBaseOutlinePaint(Color.BLACK);// 设置 Wall 的颜色renderer.setWallPaint(Color.gray);// 设置每种水果代表的柱的颜色renderer.setSeriesPaint(0, new Color(0, 0, 255));renderer.setSeriesPaint(1, new Color(0, 100, 255));renderer.setSeriesPaint(2, Color.GREEN);// 设置每种水果代表的柱的 Outline 颜色renderer.setSeriesOutlinePaint(0, Color.BLACK);renderer.setSeriesOutlinePaint(1, Color.BLACK);renderer.setSeriesOutlinePaint(2, Color.BLACK);// 设置每个地区所包含的平行柱的之间距离renderer.setItemMargin(0.1);// 显示每个柱的数值，并修改该数值的字体属性renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());renderer.setItemLabelFont(new Font("黑体", Font.PLAIN, 12));renderer.setItemLabelsVisible(true);renderer.setMaximumBarWidth(0.08D);plot.setRenderer(renderer);// 设置柱的透明度<BR>plot.setForegroundAlpha(0.6f);// 设置地区、销量的显示位置<BR>plot.setDomainAxisLocation(AxisLocation.BOTTOM_OR_LEFT);plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_LEFT);ChartUtilities.writeChartAsJPEG(response.getOutputStream(), 500, chart,600, 400, null);}/** * 获取一个演示用的简单数据集对象 * * @return */private static DefaultCategoryDataset getDataSet() {DefaultCategoryDataset dataset = new DefaultCategoryDataset();dataset.addValue(100, "北京", "苹果");dataset.addValue(100, "上海", "苹果");dataset.addValue(100, "广州", "苹果");dataset.addValue(200, "北京", "梨子");dataset.addValue(200, "上海", "梨子");dataset.addValue(200, "广州", "梨子");dataset.addValue(300, "北京", "葡萄");dataset.addValue(300, "上海", "葡萄");dataset.addValue(300, "广州", "葡萄");dataset.addValue(400, "北京", "香蕉");dataset.addValue(400, "上海", "香蕉");dataset.addValue(400, "广州", "香蕉");dataset.addValue(500, "北京", "荔枝");dataset.addValue(500, "上海", "荔枝");dataset.addValue(500, "广州", "荔枝");return dataset;// dataset.setValue("苹果",100);// dataset.setValue("梨子", 200);// dataset.setValue("葡萄", 300);// dataset.setValue("香蕉", 200);// dataset.setValue("荔枝", 200);// return dataset;}/** * Initialization of the servlet. <br> * * @throws ServletException * if an error occure */public void init() throws ServletException {// Put your code here}}?