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;

	}

}

ImagePanel

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)));
		}
	}

}