条形图表的制作(java)

一、使用的框架：JFreeChart

二、条形图

1.使用的数据集DefaultCategoryDataset.

DefaultCategoryDataset  dateset= new DefaultCategoryDataset(); dateset.setValue(100,"1","1"); dateset.setValue(90,"2","2"); dateset.setValue(90,"3","3"); dateset.setValue(90,"4","4"); dateset.setValue(90,"5","5"); dateset.setValue(90,"6","6"); dateset.setValue(90,"7","7"); dateset.setValue(90,"8","8"); dateset.setValue(90,"9","9"); dateset.setValue(90,"10","10"); dateset.setValue(90,"11","11"); dateset.setValue(90,"12","12");

setValue(纵轴的值，横轴的分类，横轴的值);

2.创建JFreeChart对象

JFreeChart panel=ChartFactory.createBarChart3D( "title", //1.图表标题 "month", //2.横轴标题 "money", //3.纵轴标题 dateset, //4.数据源 PlotOrientation.VERTICAL,//5.图表方向，使用PlotOrientation对象中的常量PlotOrientation.HORIZONTAL false, //6.是否显示图表标识  false, //7.是否显示tooltips false //7.是否显示tooltips );

3.使用输出流输出图表

OutputStream os=new FileOutputStream("f:\\test.jpg"); panel.setTitle(new TextTitle("月销售统计", new Font("宋体",Font.BOLD , 22))); ChartUtilities.writeChartAsJPEG(os, panel, 1000, 500); os.close();

输出结果：

由于在数据集中分成了12类，所以每一根柱子的颜色都不同。