Java实现jFreeChart--折线图

编写代码前需要添加以下几个包：

1、jfreechart-1.0.10-experimental.jar

2、jfreechart-1.0.10-swt.jar

3、jfreechart-1.0.10.jar

4、jcommon-1.0.13.jar

5、swtgraphics2d.jar

6、gnujaxp.jar

7、iText-2.1.1.jar

8、jcommon-1.0.13.jar

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实例一：

效果图：

代码：

1. import org.jfree.chart.ChartFactory;
2. import org.jfree.chart.JFreeChart;
3. import org.jfree.chart.labels.ItemLabelAnchor;
4. import org.jfree.chart.labels.ItemLabelPosition;
5. import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
6. import org.jfree.chart.plot.CategoryPlot;
7. import org.jfree.chart.plot.PlotOrientation;
8. import org.jfree.chart.renderer.category.BarRenderer3D;
9. import org.jfree.data.category.CategoryDataset;
10. import org.jfree.data.general.DatasetUtilities;
11. import org.jfree.ui.TextAnchor;
12. public class LineChart1 {
13.  
14. public static String genLineChart(HttpSession session)throws Exception{
15. // 访问量统计
16. TimeSeries timeSeries=new TimeSeries("某网站访问量统计", Month.class);
17. // 添加数据
18. timeSeries.add(new Month(1,2013), 100);
19. timeSeries.add(new Month(2,2013), 200);
20. timeSeries.add(new Month(3,2013), 300);
21. timeSeries.add(new Month(4,2013), 400);
22. timeSeries.add(new Month(5,2013), 560);
23. timeSeries.add(new Month(6,2013), 600);
24. timeSeries.add(new Month(7,2013), 750);
25. timeSeries.add(new Month(8,2013), 890);
26. timeSeries.add(new Month(9,2013), 120);
27. timeSeries.add(new Month(10,2013), 400);
28. timeSeries.add(new Month(11,2013), 1200);
29. timeSeries.add(new Month(12,2013), 1600);
30. // 定义时间序列的集合
31. TimeSeriesCollection lineDataset=new TimeSeriesCollection();
32. lineDataset.addSeries(timeSeries);
33. JFreeChart chart=ChartFactory.createTimeSeriesChart("访问量统计时间折线图", "月份", "访问量", lineDataset, true, true, true);
34. //设置主标题
35. chart.setTitle(new TextTitle("某网站访问量统计", new Font("隶书", Font.ITALIC, 15)));
36. //设置子标题
37. TextTitle subtitle = new TextTitle("2013年度", new Font("黑体", Font.BOLD, 12));
38. chart.addSubtitle(subtitle);
39. chart.setAntiAlias(true);
40. //设置时间轴的范围。
41. XYPlot plot = (XYPlot) chart.getPlot();
42. DateAxis dateaxis = (DateAxis)plot.getDomainAxis();
43. dateaxis.setDateFormatOverride(new java.text.SimpleDateFormat("M月"));
44. dateaxis.setTickUnit(new DateTickUnit(DateTickUnit.MONTH,1));
45. //设置曲线是否显示数据点
46. XYLineAndShapeRenderer xylinerenderer = (XYLineAndShapeRenderer)plot.getRenderer();
47. xylinerenderer.setBaseShapesVisible(true);
48. //设置曲线显示各数据点的值
49. XYItemRenderer xyitem = plot.getRenderer();
50. xyitem.setBaseItemLabelsVisible(true);
51. xyitem.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_CENTER));
52. xyitem.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
53. xyitem.setBaseItemLabelFont(new Font("Dialog", 1, 12));
54. plot.setRenderer(xyitem);
55. String fileName=ServletUtilities.saveChartAsPNG(chart, 700, 500, session);
56. return fileName;
57. }
58. }

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实例二：

效果图：

代码：

1. public class LineChart2 {
2. public static String genLineChart(HttpSession session)throws Exception{
3. // 访问量统计
4. TimeSeries timeSeries=new TimeSeries("A网站访问量统计", Month.class);
5. // 添加数据
6. timeSeries.add(new Month(1,2013), 100);
7. timeSeries.add(new Month(2,2013), 200);
8. timeSeries.add(new Month(3,2013), 300);
9. timeSeries.add(new Month(4,2013), 400);
10. timeSeries.add(new Month(5,2013), 560);
11. timeSeries.add(new Month(6,2013), 600);
12. timeSeries.add(new Month(7,2013), 750);
13. timeSeries.add(new Month(8,2013), 890);
14. timeSeries.add(new Month(9,2013), 120);
15. timeSeries.add(new Month(10,2013), 400);
16. timeSeries.add(new Month(11,2013), 1200);
17. timeSeries.add(new Month(12,2013), 1600);
18. // 访问量统计
19. TimeSeries timeSeries2=new TimeSeries("B网站访问量统计", Month.class);
20. // 添加数据
21. timeSeries2.add(new Month(1,2013), 50);
22. timeSeries2.add(new Month(2,2013), 100);
23. timeSeries2.add(new Month(3,2013), 150);
24. timeSeries2.add(new Month(4,2013), 200);
25. timeSeries2.add(new Month(5,2013), 220);
26. timeSeries2.add(new Month(6,2013), 300);
27. timeSeries2.add(new Month(7,2013), 340);
28. timeSeries2.add(new Month(8,2013), 400);
29. timeSeries2.add(new Month(9,2013), 450);
30. timeSeries2.add(new Month(10,2013), 500);
31. timeSeries2.add(new Month(11,2013), 70);
32. timeSeries2.add(new Month(12,2013), 800);
33. // 定义时间序列的集合
34. TimeSeriesCollection lineDataset=new TimeSeriesCollection();
35. lineDataset.addSeries(timeSeries);
36. lineDataset.addSeries(timeSeries2);
37. JFreeChart chart=ChartFactory.createTimeSeriesChart("访问量统计时间折线图", "月份", "访问量", lineDataset, true, true, true);
38. //设置主标题
39. chart.setTitle(new TextTitle("A,B网站访问量统计对比图", new Font("隶书", Font.ITALIC, 15)));
40. //设置子标题
41. TextTitle subtitle = new TextTitle("2013年度", new Font("黑体", Font.BOLD, 12));
42. chart.addSubtitle(subtitle);
43. chart.setAntiAlias(true);
44. //设置时间轴的范围。
45. XYPlot plot = (XYPlot) chart.getPlot();
46. DateAxis dateaxis = (DateAxis)plot.getDomainAxis();
47. dateaxis.setDateFormatOverride(new java.text.SimpleDateFormat("M月"));
48. dateaxis.setTickUnit(new DateTickUnit(DateTickUnit.MONTH,1));
49. //设置曲线是否显示数据点
50. XYLineAndShapeRenderer xylinerenderer = (XYLineAndShapeRenderer)plot.getRenderer();
51. xylinerenderer.setBaseShapesVisible(true);
52. //设置曲线显示各数据点的值
53. XYItemRenderer xyitem = plot.getRenderer();
54. xyitem.setBaseItemLabelsVisible(true);
55. xyitem.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_CENTER));
56. xyitem.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
57. xyitem.setBaseItemLabelFont(new Font("Dialog", 1, 12));
58. plot.setRenderer(xyitem);
59. String fileName=ServletUtilities.saveChartAsPNG(chart, 700, 500, session);
60. return fileName;
61. }
62. }