最近要用到实时曲线图，在网上大概找了一下，有两种实现方式，一种就是JFreeChart的官方实例MemoryUsageDemo.java.通过一个实现java.Swing.Timer的内部类，在其监听器中将实时数据添加进TimeSeries，由于Timer是会实时执行的，所以这个方法倒是没有什么问题，可以参考代码。
//RealTimeChart .java import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.plot.XYPlot; import org.jfree.data.time.Millisecond; import org.jfree.data.time.TimeSeries; import org.jfree.data.time.TimeSeriesCollection; public class RealTimeChart extends ChartPanel implements Runnable { private static TimeSeries timeSeries; private long value=0; public RealTimeChart(String chartContent,String title,String yaxisName) { super(createChart(chartContent,title,yaxisName)); } private static JFreeChart createChart(String chartContent,String title,String yaxisName){ //创建时序图对象 timeSeries = new TimeSeries(chartContent,Millisecond.class); TimeSeriesCollection timeseriescollection = new TimeSeriesCollection(timeSeries); JFreeChart jfreechart = ChartFactory.createTimeSeriesChart(title,"时间(秒)",yaxisName,timeseriescollection,true,true,false); XYPlot xyplot = jfreechart.getXYPlot(); //纵坐标设定 ValueAxis valueaxis = xyplot.getDomainAxis(); //自动设置数据轴数据范围 valueaxis.setAutoRange(true); //数据轴固定数据范围 30s valueaxis.setFixedAutoRange(30000D); valueaxis = xyplot.getRangeAxis(); //valueaxis.setRange(0.0D,200D); return jfreechart; } public void run() { while(true) { try { timeSeries.add(new Millisecond(), randomNum()); Thread.sleep(300); } catch (InterruptedException e) { } } } private long randomNum() { System.out.println((Math.random()*20+80)); return (long)(Math.random()*20+80); } } //Test.java import java.awt.BorderLayout; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; public class Test { /** * @param args */ public static void main(String[] args) { JFrame frame=new JFrame("Test Chart"); RealTimeChart rtcp=new RealTimeChart("Random Data","随机数","数值"); frame.getContentPane().add(rtcp,new BorderLayout().CENTER); frame.pack(); frame.setVisible(true); (new Thread(rtcp)).start(); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowevent) { System.exit(0); } }); } } 这两中方法都有一个问题，就是每实现一个图就要重新写一次，因为实时数据无法通过参数传进来，在想有没有可能通过setXXX()方式传进实时数据，那样的话就可以将实时曲线绘制类封装起来，而只需传递些参数即可，或者谁有更好的办法？
