JSP 利用 JFreechart直接生成报表图形的例子

<%@ page language="java" c pageEncoding="UTF-8"%>
<%@ page import="org.jfree.data.category.*"%>
<%@ page import="org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.plot.*"%>
<%
  out.clearBuffer();
  response.setContentType("image/jpeg");
  DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  dataset.addValue(610, "广州", "猪肉");
  dataset.addValue(540, "广州", "牛肉");
  dataset.addValue(320, "广州", "羊肉");
  dataset.addValue(370, "广州", "鸡肉");
  dataset.addValue(130, "广州", "鱼肉");
  JFreeChart chart = ChartFactory.createBarChart3D("BiangJi", "销量", "肉类", dataset, PlotOrientation.VERTICAL, false, false,
      false);
  java.io.OutputStream os = response.getOutputStream();
  javax.imageio.ImageIO.write(chart.createBufferedImage(500, 300), "JPEG", os);
  os.flush();
  os.close();
%>