piebyservlet.java

jfreechart不错的教程例子谢谢!

package com.segsec.chart.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;

public class PieByServlet extends HttpServlet {
	public void service(ServletRequest req, ServletResponse res)
			throws ServletException, IOException {
		res.setContentType("image/jpeg");
		PieDataset dataset = getDataSet();
		JFreeChart chart = ChartFactory.createPieChart3D(" 水果饼图", // chart title
				dataset,// data
				true, // include legend
				true, false);
		// 设置图表属性
		// 输出图片
		ChartUtilities.writeChartAsJPEG(res.getOutputStream(),1.0f, chart, 800,600, null);
	}

	private static PieDataset getDataSet() {
		DefaultPieDataset dataset = new DefaultPieDataset();
		dataset.setValue(" 市场前期", new Double(10));
		dataset.setValue(" 立项", new Double(15));
		dataset.setValue(" 计划", new Double(10));
		dataset.setValue(" 需求与设计", new Double(10));
		dataset.setValue(" 执行控制", new Double(35));
		dataset.setValue(" 收尾", new Double(10));
		dataset.setValue(" 运维", new Double(10));
		return dataset;
	}
}