利用JFrame直接显示JFreeChart的图片
核心代码就是要将一个JFreeChart 对象，写到BufferedImage中。JFreeChart 中没有提供类似getImage(), getBufferedImage()方法，而是提供了一个createBufferedImage方法。

在这个例子中，您还可以找到如何解决JFreeChart的时间乱码问题。

JFreeChart chart = createChart(data);

BufferedImage image = chart.createBufferedImage(800, 300,
BufferedImage.TYPE_INT_RGB, null);

所有源码可以在附件中找到， 需要依赖JFreeChart的Jar包。 其余就是自己改改包路径，相信这个没啥难度。就两个类，一个用于处理JFrame和JFreeChart的逻辑，一个用于画图。

TimeCharttest

package com.abczww.test.t1;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Container;import java.awt.Font;import java.awt.image.BufferedImage;import java.io.IOException;import java.text.SimpleDateFormat;import javax.swing.JFrame;import org.jfree.chart.ChartFactory;import org.jfree.chart.JFreeChart;import org.jfree.chart.axis.DateAxis;import org.jfree.chart.axis.ValueAxis;import org.jfree.chart.plot.ValueMarker;import org.jfree.chart.plot.XYPlot;import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;import org.jfree.data.time.Month;import org.jfree.data.time.Quarter;import org.jfree.data.time.TimeSeries;import org.jfree.data.time.TimeSeriesCollection;import org.jfree.data.xy.XYDataset;import org.jfree.ui.RectangleInsets;public class TimeCharttest extends JFrame {private static final long serialVersionUID = 2319942903676246265L;private ImagePanel imagePanel = new ImagePanel();private TimeCharttest() throws IOException {XYDataset data = createDataset();JFreeChart chart = createChart(data);BufferedImage image = chart.createBufferedImage(800, 300,BufferedImage.TYPE_INT_RGB, null);imagePanel.setImage(image);Container con = this.getContentPane();con.add(imagePanel, BorderLayout.CENTER);this.setSize(900, 400);this.setVisible(true);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}public static void main(String[] args) throws IOException {new TimeCharttest();}private static XYDataset createDataset() {TimeSeries timeseries = new TimeSeries("L&G 欧洲调查");timeseries.add(new Month(2, 2001), 181.8D);// 这里用的是Month.class，同样还有Day.class// Year.class 等等timeseries.add(new Month(3, 2001), 167.3D);timeseries.add(new Month(4, 2001), 153.8D);timeseries.add(new Month(5, 2001), 167.6D);timeseries.add(new Month(6, 2001), 158.8D);timeseries.add(new Month(7, 2001), 148.3D);timeseries.add(new Month(8, 2001), 153.9D);timeseries.add(new Month(9, 2001), 142.7D);timeseries.add(new Month(10, 2001), 123.2D);timeseries.add(new Month(11, 2001), 131.8D);timeseries.add(new Month(12, 2001), 139.6D);timeseries.add(new Month(1, 2002), 142.9D);timeseries.add(new Month(2, 2002), 138.7D);timeseries.add(new Month(3, 2002), 137.3D);timeseries.add(new Month(4, 2002), 143.9D);timeseries.add(new Month(5, 2002), 139.8D);timeseries.add(new Month(6, 2002), 137D);timeseries.add(new Month(7, 2002), 132.8D);TimeSeries timeseries1 = new TimeSeries("L&G 韩国调查");timeseries1.add(new Month(2, 2001), 129.6D);timeseries1.add(new Month(3, 2001), 123.2D);timeseries1.add(new Month(4, 2001), 117.2D);timeseries1.add(new Month(5, 2001), 124.1D);timeseries1.add(new Month(6, 2001), 122.6D);timeseries1.add(new Month(7, 2001), 119.2D);timeseries1.add(new Month(8, 2001), 116.5D);timeseries1.add(new Month(9, 2001), 112.7D);timeseries1.add(new Month(10, 2001), 101.5D);timeseries1.add(new Month(11, 2001), 106.1D);timeseries1.add(new Month(12, 2001), 110.3D);timeseries1.add(new Month(1, 2002), 111.7D);timeseries1.add(new Month(2, 2002), 111D);timeseries1.add(new Month(3, 2002), 109.6D);timeseries1.add(new Month(4, 2002), 113.2D);timeseries1.add(new Month(5, 2002), 111.6D);timeseries1.add(new Month(6, 2002), 108.8D);timeseries1.add(new Month(7, 2002), 101.6D);TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();timeseriescollection.addSeries(timeseries);timeseriescollection.addSeries(timeseries1);// timeseriescollection.setDomainIsPointsInTime(true); //// domain轴上的刻度点代表的是时间点而不是时间段return timeseriescollection;}// 2、由ChartFactory 产生 JFreeChart 对象private static JFreeChart createChart(XYDataset xydataset) {JFreeChart jfreechart = ChartFactory.createTimeSeriesChart("L&G单位价格调查","日期", "价格／单位", xydataset, true, true, false);jfreechart.setBackgroundPaint(Color.white);XYPlot xyplot = (XYPlot) jfreechart.getPlot(); // 获得 plot : XYPlot!!xyplot.setBackgroundPaint(Color.lightGray);xyplot.setDomainGridlinePaint(Color.white);// 网格的颜色xyplot.setRangeGridlinePaint(Color.white);// 网格的颜色xyplot.setAxisOffset(new RectangleInsets(5D, 5D, 5D, 5D));xyplot.setDomainCrosshairVisible(true);xyplot.setRangeCrosshairVisible(true);ValueAxis categoryaxis = xyplot.getDomainAxis(); // 横轴上的categoryaxis.setPositiveArrowVisible(true);// 增加横轴的箭头xyplot.getRangeAxis().setPositiveArrowVisible(true);// 增加纵轴的箭头categoryaxis.setTickLabelFont(new Font("SansSerif", 10, 12));// 设定字体、类型、字号// 一些重要的方法：// A、增加标记线：xyplot.addRangeMarker(new ValueMarker(550D)); // 数值轴Quarter quarter = new Quarter(2, 2002);xyplot.addDomainMarker(new ValueMarker(quarter.getMiddleMillisecond())); // 时间轴// xyplot.setRangeGridlinePaint(Color.blue);// -----------------------org.jfree.chart.renderer.xy.XYItemRenderer xyitemrenderer = xyplot.getRenderer();if (xyitemrenderer instanceof XYLineAndShapeRenderer) {XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer) xyitemrenderer;xylineandshaperenderer.setBaseShapesVisible(true); // 数据点可见xylineandshaperenderer.setBaseShapesFilled(true); // 数据点是实心点}// B、数据点的调整XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer) xyplot.getRenderer();xylineandshaperenderer.setBaseShapesVisible(true); // 数据点可见xylineandshaperenderer.setSeriesFillPaint(0, Color.red); // 数据点填充为红色xylineandshaperenderer.setSeriesFillPaint(1, Color.white); // 数据点填充为白色xylineandshaperenderer.setUseFillPaint(true); // 应用DateAxis dateaxis = (DateAxis) xyplot.getDomainAxis(); // 对domain// 轴上日期显示格式定义dateaxis.setDateFormatOverride(new SimpleDateFormat("MMM-yyyy"));// 解决中文乱码问题,共要处理这三部分// １、对标题Font font1 = new Font("SimSun", 10, 20); // 设定字体、类型、字号jfreechart.getTitle().setFont(font1); // 标题// ２、对图里面的汉字设定,也就是Ｐlot的设定Font font2 = new Font("SimSun", 10, 16); // 设定字体、类型、字号xyplot.getDomainAxis().setLabelFont(font2);// 相当于横轴或理解为X轴xyplot.getRangeAxis().setLabelFont(font2);// 相当于竖轴理解为Y轴// 3、下面的方块区域是 LegendTitle 对象Font font3 = new Font("SimSun", 10, 12); // 设定字体、类型、字号jfreechart.getLegend().setItemFont(font3);// 最下方return jfreechart;}}

package com.abczww.test.t1;import java.awt.Color;import java.awt.Dimension;import java.awt.Graphics;import java.awt.image.BufferedImage;import javax.swing.JPanel;public class ImagePanel extends JPanel {private static final long serialVersionUID = 4644786195524096243L;private BufferedImage image;public ImagePanel() {super();}public void setImage(BufferedImage image) {this.image = image;}protected void paintComponent(Graphics g) {super.paintComponent(g);g.setColor(Color.white);// img = Toolkit.getDefaultToolkit().getImage("C:\\test.jpg");if (null != image) {this.setSize(image.getWidth(this), image.getHeight(this));g.fill3DRect(0, 0, image.getWidth(this), image.getHeight(this),true);g.drawImage(image, 0, 0, null, this);setPreferredSize(new Dimension(image.getWidth(this),image.getHeight(this)));}}}