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
	}

}