preparation

class

ApplicationFrame类：
RefineryUtilities类：
ChartPanel类：
method

setContentPane()
由于网络原因，用到的类和方法的详细介绍，在后面补充上。
start

曲线图
package line;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.Month;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import java.awt.Color;
import org.jfree.ui.RectangleInsets;
import java.awt.Font;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.labels.*;
import org.jfree.ui.*;
import java.awt.*;
import java.text.*;
import javax.swing.JPanel;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.axis.NumberAxis;

public class LineChart extends ApplicationFrame {

    private static final long serialVersionUID = 1L;

    // 测试的main方法，显示是以JPanel窗体的形式显示的
    public static void main(String[] args) {
        LineChart LineChart= new LineChart("曲线图");
        LineChart.pack();
        RefineryUtilities.centerFrameOnScreen(LineChart);
        LineChart.setVisible(true);
    }

    public LineChart(String s) {
        super(s);
        setContentPane(createDemoLine());
    }

    // 生成显示图表的面板
    public static JPanel createDemoLine() {
        JFreeChart jfreechart = createChart(createDataset());
        return new ChartPanel(jfreechart);
    }

    // 生成图表主对象JFreeChart
    public static JFreeChart createChart(TimeSeriesCollection linedataset) {
        JFreeChart chart = ChartFactory.createTimeSeriesChart("访问量统计时间线", "月份",
                "访问量", linedataset, true, true, true);

        // 设置消除字体的锯齿渲染(解决中文问题)
        chart.getRenderingHints().put(RenderingHints.KEY_TEXT_ANTIALIASING,
                RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);

        // 设置主标题
        chart.setTitle(new TextTitle("blog访问量统计", new Font("楷书", Font.ITALIC,
                20)));
        chart.setAntiAlias(true);
        // 设置子标题
        TextTitle subtitle = new TextTitle("2010/2011年度访问量对比", new Font("宋体",
                Font.BOLD, 12));
        chart.addSubtitle(subtitle);

        XYPlot plot = (XYPlot) chart.getPlot();

        XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer) plot
                .getRenderer();

        // 设置网格背景颜色
        plot.setBackgroundPaint(Color.white);
        // 设置网格竖线颜色
        plot.setDomainGridlinePaint(Color.pink);
        // 设置网格横线颜色
        plot.setRangeGridlinePaint(Color.pink);
        // 设置曲线与xy轴的距离
        plot.setAxisOffset(new RectangleInsets(0D, 0D, 0D, 10D));
        // 设置曲线是否显示数据点
        xylineandshaperenderer.setBaseShapesVisible(true);
        // 设置曲线显示各项数据点的值
        XYItemRenderer xyitem = plot.getRenderer();
        xyitem.setBaseItemLabelsVisible(true);
        xyitem.setBasePositiveItemLabelPosition(new ItemLabelPosition(
                ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));
        xyitem.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
        xyitem.setBaseItemLabelFont(new Font("Dialog", 1, 14));
        plot.setRenderer(xyitem);

        // 设置X轴日期显示的格式
        SimpleDateFormat format = new SimpleDateFormat("yyyy/MM");
        DateAxis axis = (DateAxis) plot.getDomainAxis();
        axis.setDateFormatOverride(format);// 设置x轴数据单位以×年×月方式显示

        ValueAxis valueAxis = plot.getDomainAxis();
        // 设置x轴上面的字体
        valueAxis.setTickLabelFont(new Font("隶书", Font.ITALIC, 12));
        // 设置X轴的标题文字
        valueAxis.setLabelFont(new Font("隶书", Font.ITALIC, 12));
        NumberAxis numberAxis = (NumberAxis) plot.getRangeAxis();
        // 设置y轴上的字体
        numberAxis.setTickLabelFont(new Font("宋体", Font.PLAIN, 13));
        // 设置y轴上的标题字体
        numberAxis.setLabelFont(new Font("宋体", Font.PLAIN, 13));
        // 设置底部的字体
        chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12));

        return chart;
    }

    // 生成数据
    public static TimeSeriesCollection createDataset() {
        // 访问量统计时间线
        TimeSeries timeSeries1 = new TimeSeries("2010年度", Month.class);
        TimeSeries timeSeries2 = new TimeSeries("2011年度", Month.class);

        // 时间曲线数据集合
        TimeSeriesCollection lineDataset = new TimeSeriesCollection();

        // 构造数据集合
        timeSeries1.add(new Month(1, 2011), 7200);
        timeSeries1.add(new Month(2, 2011), 7000);
        timeSeries1.add(new Month(3, 2011), 4200);
        timeSeries1.add(new Month(4, 2011), 8200);
        timeSeries1.add(new Month(5, 2011), 7300);
        timeSeries1.add(new Month(6, 2011), 8200);
        timeSeries1.add(new Month(7, 2011), 9200);
        timeSeries1.add(new Month(8, 2011), 7300);
        timeSeries1.add(new Month(9, 2011), 9400);
        timeSeries1.add(new Month(10, 2011), 7500);
        timeSeries1.add(new Month(11, 2011), 6600);
        timeSeries1.add(new Month(12, 2011), 3500);
        timeSeries2.add(new Month(1, 2011), 10200);
        timeSeries2.add(new Month(2, 2011), 9000);
        timeSeries2.add(new Month(3, 2011), 6200);
        timeSeries2.add(new Month(4, 2011), 8200);
        timeSeries2.add(new Month(5, 2011), 8200);
        timeSeries2.add(new Month(6, 2011), 11200);
        timeSeries2.add(new Month(7, 2011), 13200);
        timeSeries2.add(new Month(8, 2011), 8300);
        timeSeries2.add(new Month(9, 2011), 10400);
        timeSeries2.add(new Month(10, 2011), 12500);
        timeSeries2.add(new Month(11, 2011), 10600);
        timeSeries2.add(new Month(12, 2011), 10500);

        lineDataset.addSeries(timeSeries1);
        lineDataset.addSeries(timeSeries2);

        return lineDataset;
    }

}
result

运行截图如下：