一、JFreeChart简介
JFreeChart是JAVA平台上的一个开放的图表绘制类库。它完全使用JAVA语言编写，是为applications,servlets以及JSP等使用所设计。
JFreeChart可生成饼图（pie charts）、柱状图（bar charts）、散点图（scatter plots）、时序图（time series）、甘特图（Gantt charts）等等多种图表，并且可以产生PNG和JPEG格式的输出，还可以与PDF和EXCEL关联。
二、JFreeChart的使用
1、加入jar包
jcommon-1.0.13.jar
jfreechart-1.0.10.jar
2、创建DefaultPieDataSet对象，用来保存图表中要显示的数据
DefaultPieDataSet dataSet = new DefaultPieDataSet();
dataSet.setValue("男生",20);
dataSet.setValue("女生",50);
3、创建图表数据对应的JFreeChart对象
JFreeChart chart = ChartFactory.createPieChart3D("男女比例图",dataSet);
4、将图表数据写入文件
File file = new File("pie.jpg");
ChartUtilities.saveChartAsJPEG(file,chart,500,300);
5、修饰
①.设置“标题”部分字体、风格、字号
chart.getTitle().setFont(new Font("隶书"，Font.BOLD,50));
②.设置“图例”部分信息"字体、风格、字号
chart.getLegend().setItemFont(new Font("宋体",Font.PLAIN,20));
③.通过PiePlot对象设置绘图区信息
1//获取代表当前图表绘图区的PiePlot对象 2 PiePlot plot = (PiePlot)chart.getPlot(); 3 //设置标签字体、风格、字号 4 plot.setLabelFont(new Font("微软雅黑",Font.ITALIC,15)); 5 //设置前景色半透明 6 plot.setForegroundAlpha(0.6f); 7 //设置标签信息格式 8 plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0},{1}/{3},{2}"));
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0:标签本身
1:当前标签对应的数量
2:百分比
3:总数量
案例1：
1//1. 2DefaultPieDataset dataSet = new DefaultPieDataset(); 3dataSet.setValue("华为", 20); 4dataSet.setValue("小米", 30); 5 6dataSet.setValue("中兴", 10); 7dataSet.setValue("锤子", 10); 8//2. 9JFreeChart chart = ChartFactory.createPieChart("手机市场占有份额", dataSet, true, true, true); 10//设置标题部分 11chart.getTitle().setFont(new Font("微软雅黑",Font.ITALIC,50)); 12//设置图例部分 13chart.getLegend().setItemFont(new Font("华文新魏",Font.BOLD,40)); 14//设置绘图区 15//1.获取绘图区对象 16PiePlot3D plot = (PiePlot3D)chart.getPlot(); 17//2.设置绘图区字体 18plot.setLabelFont(new Font("华文新魏",Font.BOLD,40)); 19//3.设置绘图区前景色透明度 20plot.setForegroundAlpha(0.6f); 21//4.设置标签信息格式 22plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0},{1}/{3},{2}")); 23 24//3. 25ChartUtilities.saveChartAsPNG(new File("1.png"), chart, 700, 500);
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案例2：代码演示：【JFreeChart创建垂直/横向柱状报表】
1）Java代码
1public class BarChart01 { 2 public static String getBarChart(HttpSession session){ 3 //1.构建数据集 4 DefaultCategoryDataset dataSet = new DefaultCategoryDataset(); 5 6 dataSet.addValue(510,"河南", "面食"); 7 dataSet.addValue(580,"黑龙江", "大米"); 8 dataSet.addValue(390,"陕西", "泡馍"); 9 dataSet.addValue(420,"广东", "杂食"); 10 11 //2.用Chart工厂生成JFreeChar图表 12 JFreeChart barChart3D = ChartFactory.createBarChart3D("面食消费统计图","面食", "比例", dataSet, PlotOrientation.VERTICAL, true, true, true); 13 14 //生成png图片 15 String chartAsPNG =null; 16 try { 17 chartAsPNG= ServletUtilities.saveChartAsPNG(barChart3D, 700, 500, null, session); 18 } catch (IOException e) { 19 e.printStackTrace(); 20 } 21 return chartAsPNG; 22 } 23 }
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2）在web.xml文件中配置如下：
1<servlet> 2<servlet-name>DisplayChart</servlet-name> 3<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class> 4</servlet> 5<servlet-mapping> 6<servlet-name>DisplayChart</servlet-name> 7<url-pattern>/DisplayChart</url-pattern> 8</servlet-mapping>
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3）index.jsp页面【需要注意的是：参数名必须是filename】
1<body> 2<% 3String fileName = BarChart01.getBarChart(session); 4%> 5 6<img src="${pageContext.request.contextPath}/DisplayChart?filename=<%=fileName%>"> 7</body>
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三、CategoryDataset 分类数据集引入
1、利用JFreeChart 创建按颜色分类的水果销售报表
1)编写Java代码,如下所示：
1public class BarChart03 { 2public static String getBarChart(HttpSession session){ 3//1.构建数据集 4double [][] dataSet = new double[][]{{1330},{740},{660},{880}}; 5 6String[] rowKeys = new String[]{"苹果","香蕉","橘子","梨子"}; 7String[] columnKeys = new String[]{"深圳"}; 8 9CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, dataSet); 10//2.用Chart工厂生成JFreeChar图表 11JFreeChart barChart3D = ChartFactory.createBarChart3D("面食消费统计图","水果", "数量", dataset, PlotOrientation.VERTICAL, true, true, true); 12//生成png图片 13String chartAsPNG =null; 14try { 15chartAsPNG= ServletUtilities.saveChartAsPNG(barChart3D, 700, 500, null, session); 16} catch (IOException e) { 17e.printStackTrace(); 18} 19return chartAsPNG; 20} 21}
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2)在web.xml文件中配置如下：
1<servlet> 2<servlet-name>DisplayChart</servlet-name> 3<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class> 4</servlet> 5<servlet-mapping> 6<servlet-name>DisplayChart</servlet-name> 7<url-pattern>/DisplayChart</url-pattern> 8</servlet-mapping>
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3)在index.jsp页面中
1<body> 2<% 3String fileName = BarChart03.getBarChart(session); 4%> 5 6<img src="${pageContext.request.contextPath}/DisplayChart?filename=<%=fileName%>"> 7</body>
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2、利用JFreeChart 创建按颜色分类并且按地区分类水果销售报表
- 编写Java代码
1public class BarChart03 { 2public static String getBarChart(HttpSession session){ 3//1.构建数据集 4double [][] dataSet = new double[][]{{1330,770,880,990},{740,760,890,890},{660,760,780,980},{880,790,880,790}}; 5 6String[] rowKeys = new String[]{"苹果","香蕉","橘子","梨子"}; 7String[] columnKeys = new String[]{"深圳","上海","海南","广东"}; 8 9CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, dataSet); 10//2.用Chart工厂生成JFreeChar图表 11JFreeChart barChart3D = ChartFactory.createBarChart3D("水果销量统计图","水果", "销量", dataset, PlotOrientation.VERTICAL, true, true, true); 12//生成png图片 13String chartAsPNG =null; 14try { 15chartAsPNG= ServletUtilities.saveChartAsPNG(barChart3D, 700, 500, null, session); 16} catch (IOException e) { 17e.printStackTrace(); 18} 19return chartAsPNG; 20} 21}
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2)在web.xml文件中配置如下：
1<servlet> 2<servlet-name>DisplayChart</servlet-name> 3<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class> 4</servlet> 5<servlet-mapping> 6<servlet-name>DisplayChart</servlet-name> 7<url-pattern>/DisplayChart</url-pattern> 8</servlet-mapping>
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3)在index.jsp页面中
1<body> 2<% 3String fileName = BarChart03.getBarChart(session); 4%> 5 6<img src="${pageContext.request.contextPath}/DisplayChart?filename=<%=fileName%>"> 7</body>
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四、CategoryPlot ，BarRender3D 引入
1、利用JFreeChart 创建自定义3D 柱状报表
1).Java代码编写
1public class BarChart03 { 2 3public static String getBarChart(HttpSession session){ 4//1.构建数据集 5double [][] dataSet = new double[][]{{1330,770,880,990},{740,760,890,890},{660,760,780,980},{880,790,880,790}}; 6 7String[] rowKeys = new String[]{"苹果","香蕉","橘子","梨子"}; 8String[] columnKeys = new String[]{"深圳","上海","海南","广东"}; 9 10CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, dataSet); 11//2.用Chart工厂生成JFreeChar图表 12JFreeChart barChart3D = ChartFactory.createBarChart3D("水果销量统计图","水果", "销量", dataset, PlotOrientation.VERTICAL, true, true, true); 13//这里换成了getCategoryPlot方法！ 14CategoryPlot plot = barChart3D.getCategoryPlot(); 15 16plot.setBackgroundPaint(Color.white); 17// 设置网格竖线颜色 18plot.setOutlinePaint(Color.pink); 19// 设置网格横线颜色 20plot.setOutlinePaint(Color.pink); 21 22// 显示每个柱的数值，并修改该数值的字体属性 23BarRenderer3D renderer=new BarRenderer3D(); 24renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator()); 25renderer.setBaseItemLabelsVisible(true); 26 27renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT)); 28renderer.setItemLabelAnchorOffset(10D); 29 30// 设置平行柱的之间距离 31renderer.setItemMargin(0.4); 32plot.setRenderer(renderer); 33 34//生成png图片 35String chartAsPNG =null; 36try { 37chartAsPNG= ServletUtilities.saveChartAsPNG(barChart3D, 700, 500, null, session); 38} catch (Exception e) { 39e.printStackTrace(); 40} 41return chartAsPNG; 42} 43}
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2).在web.xml文件中配置如下：
1<servlet> 2<servlet-name>DisplayChart</servlet-name> 3<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class> 4</servlet> 5<servlet-mapping> 6<servlet-name>DisplayChart</servlet-name> 7<url-pattern>/DisplayChart</url-pattern> 8</servlet-mapping>
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3).在index.jsp页面中
1<body> 2<% 3String fileName = BarChart03.getBarChart(session); 4%> 5 6<img src="${pageContext.request.contextPath}/DisplayChart?filename=<%=fileName%>"> 7</body>
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五、饼状图
1、DefaultPieDataset，PiePlot，PiePlot3D 引入
2、利用JFreeChart 创建普通饼状图报表
1)Java代码
1public class PieChart1 { 2 3public static String getPieChart(HttpSession session) throws Exception{ 4//1.拿到数据集 5DefaultPieDataset dataSet = new DefaultPieDataset(); 6dataSet.setValue("苹果",1000); 7dataSet.setValue("梨子",800); 8dataSet.setValue("香蕉",1200); 9dataSet.setValue("菠萝",400); 10 11//2.利用Chart工厂生产对象 12JFreeChart chart = ChartFactory.createPieChart("人均每年水果消耗量", dataSet, true, true, true); 13 14chart.addSubtitle(new TextTitle("2013年度")); 15 16PiePlot pieplot=(PiePlot)chart.getPlot(); 17pieplot.setLabelFont(new Font("宋体",0,11)); 18// 设置饼图是圆的（true），还是椭圆的（false）；默认为true 19pieplot.setCircular(true); 20// 没有数据的时候显示的内容 21pieplot.setNoDataMessage("无数据显示"); 22StandardPieSectionLabelGenerator standarPieIG = new StandardPieSectionLabelGenerator("{0}:({1}.{2})", NumberFormat.getNumberInstance(), NumberFormat.getPercentInstance()); 23pieplot.setLabelGenerator(standarPieIG); 24//3. 25String png = ServletUtilities.saveChartAsPNG(chart, 700, 500, null, session); 26 27return png; 28} 29}
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2)在web.xml文件中配置如下：
1<servlet> 2<servlet-name>DisplayChart</servlet-name> 3<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class> 4</servlet> 5<servlet-mapping> 6<servlet-name>DisplayChart</servlet-name> 7<url-pattern>/DisplayChart</url-pattern> 8</servlet-mapping>
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3)在index.jsp页面中
1<body> 2<% 3String fileName = BarChart03.getBarChart(session); 4%> 5 6<img src="${pageContext.request.contextPath}/DisplayChart?filename=<%=fileName%>"> 7</body>
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3、利用JFreeChart 创建普通饼状图报表，并且突出一个
只需要在原来的java代码中加入：
pieplot.setExplodePercent("菠萝",0.23);
即可将这一栏突出显示；
4、利用JFreeChart 创建3D 饼状图报表
只需要将：
JFreeChart chart = ChartFactory.createPieChart("人均每年水果消耗量", dataSet, true, true, true);
改为：
JFreeChart chart = ChartFactory.createPieChart3D("人均每年水果消耗量", dataSet,true, true, true);
即可创建3D饼状图报表！
5、针对3D饼状图添加 透明度等设置
【只需要在上面的代码中加入如下的设置】：
1 //设置开始角度 2 pieplot.setStartAngle(120D); 3 //设置方向为”顺时针方向“ 4 pieplot.setDirection(Rotation.CLOCKWISE); 5 //设置透明度，0.5F为半透明，1为不透明，0为全透明 6 pieplot.setForegroundAlpha(0.7F);
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六、SpringMVC整合JFreeChart
1、在springMVC的controller代码中：
1@RequestMapping("/testView") 2public ModelAndView testView(HttpServletRequest request) throws Exception{ 3ModelAndView mv = new ModelAndView(); 4//1.构建数据集 5DefaultCategoryDataset dataSet = new DefaultCategoryDataset(); 6 7dataSet.addValue(510,"河南", "面食"); 8dataSet.addValue(580,"黑龙江", "大米"); 9dataSet.addValue(390,"陕西", "泡馍"); 10dataSet.addValue(420,"广东", "杂食"); 11 12//2.用Chart工厂生成JFreeChar图表 13JFreeChart barChart3D = ChartFactory.createBarChart3D("面食消费统计图","面食", "比例", dataSet, PlotOrientation.VERTICAL, true, true, true); 14// 6. 将图形转换为图片，传到前台 15String fileName = ServletUtilities.saveChartAsJPEG(barChart3D, 700, 400, null, request.getSession()); 16String chartURL = request.getContextPath() + "/chart?filename=" + fileName; 17mv.addObject("fileName", fileName); 18mv.setViewName("success"); 19return mv; 20}
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2、在web.xml文件中配置如下：
1<servlet> 2<servlet-name>DisplayChart</servlet-name> 3<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class> 4</servlet> 5 6<servlet-mapping> 7<servlet-name>DisplayChart</servlet-name> 8<url-pattern>/chart</url-pattern> 9</servlet-mapping>
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3、在index.jsp页面:
<a href="${pageContext.request.contextPath }/testView">查看详情</a>
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4、在success.jsp页面
1<body> 2<img src="${pageContext.request.contextPath }/chart?filename=${fileName}"> 3</body>
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