JFreeChart学习（三）——动态打印java内存使用情况

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.time.Millisecond;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.ui.RectangleInsets;

public class MemoryUsage extends JPanel {

class DataGenerator extends Timer implements ActionListener {

/*
* Invoked when an action occurs.
*
* @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
*/
public void actionPerformed(ActionEvent actionevent) {
long free = Runtime.getRuntime().freeMemory();
long total = Runtime.getRuntime().totalMemory();
addTotalObservation(total);
addFreeObservation(free);
}

DataGenerator(int i) {
super(i, null);
addActionListener(this);
}
}

public MemoryUsage(int maxItemAge) {
super(new BorderLayout());
total = new TimeSeries("Total Memory",
org.jfree.data.time.Millisecond.class);
total.setMaximumItemAge(maxItemAge);
//        free = new TimeSeries("Free Memory",
//                org.jfree.data.time.Millisecond.class);
free = new TimeSeries("Free Memory");

free.setMaximumItemAge(maxItemAge);

TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
timeseriescollection.addSeries(total);
timeseriescollection.addSeries(free);

DateAxis dateaxis = new DateAxis("Time");
NumberAxis numberaxis = new NumberAxis("Memory");
dateaxis.setTickLabelFont(new Font("SansSerif", 0, 12));
numberaxis.setTickLabelFont(new Font("SansSerif", 0, 12));
dateaxis.setLabelFont(new Font("SansSerif", 0, 14));
numberaxis.setLabelFont(new Font("SansSerif", 0, 14));
dateaxis.setAutoRange(true);
dateaxis.setLowerMargin(0.0D);
dateaxis.setUpperMargin(0.0D);
dateaxis.setTickLabelsVisible(true);
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

XYLineAndShapeRenderer xylineandshaperenderer = new XYLineAndShapeRenderer(
true, false);
xylineandshaperenderer.setSeriesPaint(0, Color.RED); // 改变第一个Series的颜色
xylineandshaperenderer.setSeriesPaint(1, Color.YELLOW);// 改变第二个Series的颜色
xylineandshaperenderer.setSeriesStroke(0, new BasicStroke(1F, 0, 2));
xylineandshaperenderer.setSeriesStroke(1, new BasicStroke(1F, 0, 2));

XYPlot xyplot = new XYPlot(timeseriescollection, dateaxis, numberaxis,
xylineandshaperenderer);
xyplot.setBackgroundPaint(Color.BLACK); // 改变背景颜色
xyplot.setDomainGridlinePaint(Color.white);
xyplot.setRangeGridlinePaint(Color.white);
xyplot.setAxisOffset(new RectangleInsets(1D, 1D, 1D, 1D));

JFreeChart jfreechart = new JFreeChart("JVM Memory Usage", new Font(
"SansSerif", 1, 24), xyplot, true);
jfreechart.setBackgroundPaint(Color.white);

ChartPanel chartpanel = new ChartPanel(jfreechart, true);
chartpanel.setBorder(BorderFactory.createCompoundBorder(BorderFactory
.createEmptyBorder(10, 10, 10, 10), BorderFactory
.createLineBorder(Color.black)));

add(chartpanel);
}

private void addTotalObservation(double d) {
total.add(new Millisecond(), d);
}

private void addFreeObservation(double d) {
free.add(new Millisecond(), d);
}

/**
* @param args
*/
public static void main(String[] args) {
JFrame jframe = new JFrame("JVM Memory Usage");
MemoryUsage memoryusagedemo = new MemoryUsage(10000);
jframe.getContentPane().add(memoryusagedemo, "Center");
jframe.setBounds(200, 120, 1000, 500);
jframe.setVisible(true);
(memoryusagedemo.new DataGenerator(1000)).start();
jframe.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowevent) {
System.exit(0);
}
});
}

private TimeSeries total;
private TimeSeries free;
}