jfreeChart折线图，如何显示节点数据呢？
如题

[解决办法]

Java code

import java.awt.*;import java.awt.geom.Rectangle2D;import org.jfree.chart.ChartFactory;import org.jfree.chart.ChartPanel;import org.jfree.chart.JFreeChart;import org.jfree.chart.labels.StandardXYItemLabelGenerator;import org.jfree.chart.labels.ItemLabelAnchor;import org.jfree.chart.labels.ItemLabelPosition;import org.jfree.chart.title.TextTitle;import org.jfree.chart.axis.NumberAxis;import org.jfree.chart.plot.*;import org.jfree.chart.renderer.category.LineAndShapeRenderer;import org.jfree.chart.renderer.xy.XYItemRenderer;import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;import org.jfree.data.category.CategoryDataset;import org.jfree.data.category.DefaultCategoryDataset;import org.jfree.data.time.Month;import org.jfree.data.time.TimeSeries;import org.jfree.data.time.TimeSeriesCollection;import org.jfree.ui.ApplicationFrame;import org.jfree.ui.RefineryUtilities;import org.jfree.ui.TextAnchor;import org.jfree.ui.RectangleInsets;/** * A line chart demo showing the use of a custom drawing supplier. * */public class LineChartDemo2 extends ApplicationFrame{    /**     * Creates a new demo.     *     * @param title the frame title.     */    public LineChartDemo2(final String title)    {        super(title);        TimeSeries timeSeries = new TimeSeries("阿蜜果blog访问量统计", Month.class);//时间曲线数据集合        TimeSeriesCollection lineDataset = new TimeSeriesCollection();//构造数据集合        timeSeries.add(new Month(1, 2007), 11200);        timeSeries.add(new Month(2, 2007), 9000);        timeSeries.add(new Month(3, 2007), 6200);        timeSeries.add(new Month(4, 2007), 8200);        timeSeries.add(new Month(5, 2007), 8200);        timeSeries.add(new Month(6, 2007), 12200);        timeSeries.add(new Month(7, 2007), 13200);        timeSeries.add(new Month(8, 2007), 8300);        timeSeries.add(new Month(9, 2007), 12400);        timeSeries.add(new Month(10, 2007), 12500);        timeSeries.add(new Month(11, 2007), 13600);        timeSeries.add(new Month(12, 2007), 12500);        lineDataset.addSeries(timeSeries);        JFreeChart chart = ChartFactory.createTimeSeriesChart("访问量统计时间线", "月份", "访问量", lineDataset, true, true, true);//设置子标题        TextTitle subtitle = new TextTitle("2007年度", new Font("黑体", Font.BOLD, 12));        chart.addSubtitle(subtitle);//设置主标题        chart.setTitle(new TextTitle("阿蜜果blog访问量统计", new Font("隶书", Font.ITALIC, 15)));        chart.setAntiAlias(true);        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);//设置曲线图与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);//设置曲线显示各数据点的值        XYItemRenderer xyitem = plot.getRenderer();        xyitem.setBaseItemLabelsVisible(true);        xyitem.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));        //下面三句是对设置折线图数据标示的关键代码        xyitem.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());        xyitem.setBaseItemLabelFont(new Font("Dialog", 1, 14));        plot.setRenderer(xyitem);        final ChartPanel chartPanel = new ChartPanel(chart);        chartPanel.setPreferredSize(new Dimension(500, 270));        setContentPane(chartPanel);    }    /**     * Starting point for the demonstration application.     *     * @param args ignored.     */    public static void main(final String[] args){        final LineChartDemo2 demo = new LineChartDemo2("Line Chart Demo 5");        demo.pack();        RefineryUtilities.centerFrameOnScreen(demo);        demo.setVisible(true);    }}