Java开发条形图、柱形图、饼图生成.doc

JreeChart案例jFreeChart是Java开发中常用的统计类组件，主要包括柱状图，饼状图等。下面我们介绍一下jFreeChart最简单的用法。首先需要导入jFreeChart的jar包，放在项目webWEB-INFlib文件夹下。然后我们以最简洁的代码实现一个统计功能。1.柱状图importjava.awt.Color;importjava.awt.Font;importjava.io.FileNotFoundException;importjava.io.FileOutputStream;importjava.io.IOException;importorg.jfree.chart.ChartFactory;importorg.jfree.chart.ChartUtilities;importorg.jfree.chart.JFreeChart;importorg.jfree.chart.axis.CategoryAxis;importorg.jfree.chart.axis.NumberAxis;importorg.jfree.chart.plot.CategoryPlot;importorg.jfree.chart.plot.PlotOrientation;importorg.jfree.chart.title.TextTitle;importorg.jfree.data.category.DefaultCategoryDataset;publicclassBarChartTestpublicstaticvoidmain(Stringargs)DefaultCategoryDatasetdataset=newDefaultCategoryDataset();dataset.addValue(20,企业备案数,北京局);dataset.addValue(18,企业备案数,上海局);dataset.addValue(16,企业备案数,天津局);dataset.addValue(15,企业备案数,重庆局);dataset.addValue(45,企业备案数,山东局);JFreeChartchart=ChartFactory.createBarChart(企业备案图,直属局,企业备案数,dataset,PlotOrientation.HORIZONTAL,true,false,false);/*/*Astart*/设置标题字体样式TextTitletextTitle=chart.getTitle();textTitle.setFont(newFont(黑体,Font.PLAIN,20);/设置柱状体颜色CategoryPlotcategoryplot=(CategoryPlot)chart.getPlot();categoryplot.getRenderer().setSeriesPaint(0,newColor(228,109,10);NumberAxisnumberaxis=(NumberAxis)categoryplot.getRangeAxis();CategoryAxisdomainAxis=categoryplot.getDomainAxis();/设置X轴坐标上的字体样式domainAxis.setTickLabelFont(newFont(sans-serif,Font.PLAIN,11);/设置X轴的标题字体样式domainAxis.setLabelFont(newFont(宋体,Font.PLAIN,12);/设置Y轴坐标上的字体样式numberaxis.setTickLabelFont(newFont(sans-serif,Font.PLAIN,12);/设置Y轴的标题字体样式numberaxis.setLabelFont(newFont(黑体,Font.PLAIN,12);/设置图片最底部字体样式if(chart.getLegend()!=null)chart.getLegend().setItemFont(newFont(宋体,Font.PLAIN,12);/*/*Aend*/tryChartUtilities.writeChartAsPNG(newFileOutputStream(D:barChart.jpg),chart,400,200);catch(FileNotFoundExceptione)e.printStackTrace();catch(IOExceptione)e.printStackTrace();生成的文件显示效果如下：2.饼状图importjava.awt.Color;importjava.awt.Font;importjava.io.FileNotFoundException;importjava.io.FileOutputStream;importjava.io.IOException;importjava.text.DecimalFormat;importjava.text.NumberFormat;importorg.jfree.chart.ChartFactory;importorg.jfree.chart.ChartUtilities;importorg.jfree.chart.JFreeChart;importorg.jfree.chart.labels.StandardPieSectionLabelGenerator;importorg.jfree.chart.plot.PiePlot;importorg.jfree.data.general.DefaultPieDataset;publicclassPieChartTestpublicstaticvoidmain(Stringargs)DefaultPieDatasetpieDataset=newDefaultPieDataset();pieDataset.setValue(北京局,20);pieDataset.setValue(上海局,18);pieDataset.setValue(天津局,16);pieDataset.setValue(重庆局,15);pieDataset.setValue(山东局,45);JFreeChartchart=ChartFactory.createPieChart3D(企业备案图,pieDataset,true,false,false);/*/*Astart*/设置标题字体样式chart.getTitle().setFont(newFont(黑体,Font.BOLD,20);/设置饼状图里描述字体样式PiePlotpiePlot=(PiePlot)chart.getPlot();piePlot.setLabelFont(newFont(黑体,Font.BOLD,10);/设置显示百分比样式piePlot.setLabelGenerator(newStandardPieSectionLabelGenerator(0(2),NumberFormat.getNumberInstance(),newDecimalFormat(0.00%);/设置统计图背景piePlot.setBackgroundPaint(Color.white);/设置图片最底部字体样式chart.getLegend().setItemFont(newFont(黑体,Font.BOLD,10);/*/*Aend*/tryChartUtilities.writeChartAsPNG(newFileOutputStream(D:pieChart.jpg),chart,400,300);catch(FileNotFoundExceptione)e.printStackTr