使用JFreeChart生成XY轴折线图

第一步：?

1. //生成折线图的处理类(其他DOMAIN类代码省略)?????
2. public?class?CreateJFreeChartXYLine?{??
3. ????//?保存为文件??
4. ????public?static?void?saveAsFile(JFreeChart?chart,?String?outputPath,??
5. ????????????int?weight,?int?height)?{??
6. ????????FileOutputStream?out?=?null;??
7. ????????try?{??
8. ????????????File?outFile?=?new?File(outputPath);??
9. ????????????if?(!outFile.getParentFile().exists())?{??
10. ????????????????outFile.getParentFile().mkdirs();??
11. ????????????}??
12. ????????????out?=?new?FileOutputStream(outputPath);??
13. ??
14. ????????????//?保存为PNG??
15. ????????????ChartUtilities.writeChartAsPNG(out,?chart,500,?400);??
16. ????????????//?保存为JPEG??
17. ????????????//?ChartUtilities.writeChartAsJPEG(out,?chart,?500,?400);??
18. ????????????out.flush();??
19. ????????}?catch?(FileNotFoundException?e)?{??
20. ????????????e.printStackTrace();??
21. ????????}?catch?(IOException?e)?{??
22. ????????????e.printStackTrace();??
23. ????????}?finally?{??
24. ????????????if?(out?!=?null)?{??
25. ????????????????try?{??
26. ????????????????????out.close();??
27. ????????????????}?catch?(IOException?e)?{??
28. ????????????????????//?do?nothing??
29. ????????????????}??
30. ????????????}??
31. ????????}??
32. ????}??
33. ??
34. ????//?根据XYDataset创建JFreeChart对象??
35. ????public?static?JFreeChart?createChart(XYDataset?dataset)?{??
36. ????????//?创建JFreeChart对象：ChartFactory.createXYLineChart??
37. ????????JFreeChart?jfreechart?=?ChartFactory.createTimeSeriesChart("折线模型图",??
38. ????????????????"年份",?"数量",?dataset,?false,?true,?false);??
39. ????????jfreechart.getTitle().setFont(new?Font("宋体",?Font.BOLD,?12));??
40. ????????//?使用CategoryPlot设置各种参数。以下设置可以省略。??
41. ????????XYPlot?plot?=?(XYPlot)?jfreechart.getPlot();??
42. ????????//?背景色?透明度??
43. ????????plot.setBackgroundAlpha(0.5f);??
44. ????????//?前景色?透明度??
45. ????????plot.setForegroundAlpha(0.5f);??
46. ????????//?其它设置可以参考XYPlot类??
47. ????????ValueAxis?categoryaxis?=?plot.getDomainAxis();?//?横轴上的??
48. ????????categoryaxis.setPositiveArrowVisible(true);//?增加横轴的箭头??
49. ????????plot.getRangeAxis().setPositiveArrowVisible(true);//?增加纵轴的箭头??
50. ????????categoryaxis.setTickLabelFont(new?Font("宋体",?10,?12));//?设定字体、类型、字号??
51. ????????DateAxis?axis?=?(DateAxis)?plot.getDomainAxis();??
52. ????????axis.setDateFormatOverride(new?SimpleDateFormat("MM月"));??
53. ????????NumberAxis?numberaxis?=?new?NumberAxis("统计报表");//侧面显示的标题??
54. ????????numberaxis.setAutoRangeIncludesZero(false);??
55. ????????plot.setRangeAxis(1,?numberaxis);??
56. ????????plot.setDataset(1,?dataset);??
57. ????????plot.mapDatasetToRangeAxis(1,?1);??
58. ????????XYItemRenderer?xyitemrenderer?=?plot.getRenderer();??
59. ????????StandardXYItemRenderer?standardxyitemrenderer1?=?new?StandardXYItemRenderer();??
60. ????????standardxyitemrenderer1.setSeriesPaint(0,?Color.black);??
61. ????????standardxyitemrenderer1.setSeriesPaint(0,?Color.black);??
62. ????????standardxyitemrenderer1.setPlotLines(true);??
63. ????????LegendTitle?legendtitle?=?new?LegendTitle(xyitemrenderer);??
64. ????????LegendTitle?legendtitle1?=?new?LegendTitle(standardxyitemrenderer1);??
65. ????????BlockContainer?blockcontainer?=?new?BlockContainer(??
66. ????????????????new?BorderArrangement());??
67. ????????blockcontainer.add(legendtitle,?RectangleEdge.LEFT);??
68. ????????blockcontainer.add(legendtitle1,?RectangleEdge.RIGHT);//这两行代码可以控制位置??
69. ????????blockcontainer.add(new?EmptyBlock(2000D,?0.0D));??
70. ????????CompositeTitle?compositetitle?=?new?CompositeTitle(blockcontainer);??
71. ????????compositetitle.setPosition(RectangleEdge.BOTTOM);//放置图形代表区域位置的代码??
72. ????????jfreechart.addSubtitle(compositetitle);??
73. ????????Font?font2?=?new?Font("宋体",?10,?16);?//?设定字体、类型、字号??
74. ????????plot.getDomainAxis().setLabelFont(font2);//?相当于横轴或理解为X轴??
75. ????????plot.getRangeAxis().setLabelFont(font2);//?相当于竖轴理解为Y轴??
76. ????????return?jfreechart;??
77. ????}??
78. ??
79. ????/**?
80. ?????*?创建XYDataset对象?
81. ?????*??
82. ?????*/??
83. ????public?static?XYDataset?createXYDataset()?{??
84. ????????MyChartService?ms?=?new?MyChartService();??
85. ????????//?XYSeriesCollection?xySeriesCollection?=?new?XYSeriesCollection();??
86. ????????TimeSeriesCollection?timeseriescollection?=?new?TimeSeriesCollection();??
87. ????????List<String>?names?=?ms.listall();??
88. ????????for?(String?name?:?names)?{??
89. ????????????System.out.println(name);??
90. ????????????TimeSeries?timeseries?=?new?TimeSeries(name);??
91. ????????????List<MyChart>?mcs?=?ms.FindByName(name);??
92. ????????????for?(MyChart?mc?:?mcs)?{??
93. ????????????????Calendar?cc?=?Calendar.getInstance();??
94. ????????????????System.out.println(mc.getScore());??
95. ????????????????cc.setTime(mc.getDate());??
96. ????????????????timeseries.add(new?Month(cc.get(Calendar.MONTH),?cc??
97. ????????????????????????.get(Calendar.YEAR)),?mc.getScore());??
98. ????????????????//?xyseries.add(mc.getDate(),mc.getScore());??
99. ??
100. ????????????}??
101. ????????????//?xySeriesCollection.addSeries(timeseries);??
102. ????????????timeseriescollection.addSeries(timeseries);??
103. ??
104. ????????}??
105. ??
106. ????????return?timeseriescollection;??
107. ????} ?

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第二步：如果配合Struts1使用的话

1. request.setCharacterEncoding("gbk");???
2. response.setContentType("image/jpeg;charset=gbk");???
3. MyChartService?ms=new?MyChartService();???
4. //步骤1：创建XYDataset对象（准备数据）?????
5. ????????XYDataset?dataset?=CreateJFreeChartXYLine.createXYDataset();?????
6. ????????//步骤2：根据Dataset?生成JFreeChart对象，以及做相应的设置?????
7. ????????JFreeChart?freeChart?=CreateJFreeChartXYLine.createChart(dataset);?????
8. ????????//步骤3：将JFreeChart对象输出到文件，Servlet输出流等?????
9. ????????String?url=?"c:\\jfreechart\\lineXY.png";???
10. ????????CreateJFreeChartXYLine.saveAsFile(freeChart,url,?900,?700);????
11. ????????request.setAttribute("url",?url);???
12. ????????request.setAttribute("lists",?ms.listall());???
13. return?mapping.findForward("list"); ??

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直接将路径发到JSP页面，从而达到显示图片效果