从网上找了一个用jfreechart作时序图的例子，但是这个例子是把生成的图片保存在硬盘上，而不是显示出来。代码如下，请问是否能帮我让图片显示在web页面上，谢谢！
<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK" import="java.util.Date,java.text.SimpleDateFormat,java.util.Enumeration" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@page import="DBConnection.JdbcPool"%>
<%@include file="../../css/Content.css" %>
<%@include file="../../JS/autoset.js" %>
<%@ page import="java.awt.Font"%>
<%@ page import="javax.swing.JPanel"%>
<%@ page import="java.text.SimpleDateFormat"%>
<%@ page import="org.jfree.chart.ChartFactory"%>
<%@ page import="org.jfree.chart.ChartFrame"%>
<%@ page import="org.jfree.chart.ChartUtilities"%>
<%@ page import="org.jfree.chart.JFreeChart"%>
<%@ page import="org.jfree.chart.axis.DateAxis"%>
<%@ page import="org.jfree.chart.plot.XYPlot"%>
<%@ page import="org.jfree.data.time.Day"%>
<%@ page import="org.jfree.data.time.TimeSeriesCollection"%>
<%@ page import="org.jfree.chart.ChartPanel"%>
<%@ page import="org.jfree.chart.axis.ValueAxis"%>
<%@ page import="org.jfree.data.time.*"%>
<%@ page import="org.jfree.data.xy.XYDataset"%>
<%@ page import="org.jfree.ui.ApplicationFrame"%>
<%@ page import="org.jfree.ui.RefineryUtilities"%>
<%@ page import="java.io.*"%>
<%@ page import="java.sql.*"%>
<%
// 创建第一条时序线
TimeSeries pop1 = new TimeSeries("Population1", Day.class);
pop1.add(new Day(10, 1, 2004), 100);
pop1.add(new Day(10, 2, 2004), 150);
pop1.add(new Day(10, 3, 2004), 250);
pop1.add(new Day(10, 4, 2004), 275);
pop1.add(new Day(10, 5, 2004), 325);
pop1.add(new Day(10, 6, 2004), 425);
// 创建第二条时序线
TimeSeries pop2 = new TimeSeries("Population2", Day.class);
pop2.add(new Day(20, 1, 2004), 200);
pop2.add(new Day(20, 2, 2004), 250);
pop2.add(new Day(20, 3, 2004), 450);
pop2.add(new Day(20, 4, 2004), 475);
pop2.add(new Day(20, 5, 2004), 125);
pop2.add(new Day(20, 6, 2004), 150);
// 创建一个时序集合
TimeSeriesCollection dataset = new TimeSeriesCollection();
dataset.addSeries(pop1);
dataset.addSeries(pop2);
// 产生时序图
JFreeChart chart = ChartFactory.createTimeSeriesChart("人口统计时序 图","Date","Population",dataset,true,true,false);
ChartFrame cf = new ChartFrame("时序图",chart);
cf.pack();
cf.setSize(500,300);
cf.setVisible(true);
//保存图片,请问如何实时显示出来
ChartUtilities.saveChartAsJPEG(new File("C:\\TimeSeriesChart1.jpg"), chart, 500, 300);
%>
------解决方案--------------------
为了将生成的图表直接传给客户端浏览器，只需要将例子中的文件流换成是通过HttpServletResponse对象获取到的输出流，
自己写个Servlet,
如:
- Java code
public class ChartDemoServlet extends HttpServlet { public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException { res.setContentType("image/jpeg"); DefaultPieDataset data = getDataSet(); JFreeChart chart = ChartFactory.createPie3DChart("水果产量图", data, true, false, false ); ChartUtilities.writeChartAsJPEG(res.getOutputStream(), 100,chart,400,300,null); } /** * 获取一个演示用的简单数据集对象 * @return */ private static DefaultPieDataset getDataSet() { DefaultPieDataset dataset = new DefaultPieDataset(); dataset.setValue("苹果",100); dataset.setValue("梨子",200); dataset.setValue("葡萄",300); dataset.setValue("香蕉",400); dataset.setValue("荔枝",500); return dataset; }}