JFreeChart生成柱状图 jfreechart-0.9.16.jar-优快云博客

本文链接：https://blog.youkuaiyun.com/2004v2004/article/details/1459445

本文介绍了一个使用Java和JFreeChart库绘制3D柱状图的具体示例，展示了如何通过设置数据集、图表样式及参数来生成一张展示不同水果在多个城市的销量对比图表。

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<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="java.awt.Color,
                java.awt.Font,
                org.jfree.chart.ChartFactory,
                org.jfree.chart.JFreeChart,
                org.jfree.chart.plot.PlotOrientation,
                org.jfree.chart.servlet.ServletUtilities,
                org.jfree.data.CategoryDataset,
                org.jfree.data.DatasetUtilities,
                org.jfree.chart.plot.CategoryPlot,
                org.jfree.chart.axis.CategoryAxis,
                org.jfree.chart.axis.ValueAxis,
                org.jfree.chart.renderer.BarRenderer3D,
                org.jfree.chart.labels.StandardCategoryItemLabelGenerator,
                org.jfree.chart.axis.AxisLocation"%>
<%

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  double[][] data = new double[][] {{672, 766, 223, 540, 126},{325, 521, 210, 340, 106},{332, 256, 523, 240, 526}};
  String[] rowKeys = {"苹果","梨子","葡萄"};
  String[] columnKeys = {"北京","上海","广州","成都","深圳"};
  CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data);

  JFreeChart chart = ChartFactory.createBarChart3D("水果销量图统计",
                  null,
                  null,
                  dataset,
                  PlotOrientation.VERTICAL,
                  true,false,false);
  chart.setBackgroundPaint(Color.WHITE);
  CategoryPlot plot = chart.getCategoryPlot();

  CategoryAxis domainAxis = plot.getDomainAxis();
  domainAxis.setVerticalCategoryLabels(false);
  plot.setDomainAxis(domainAxis);

  ValueAxis rangeAxis = plot.getRangeAxis();
  //设置最高的一个 Item 与图片顶端的距离
  rangeAxis.setUpperMargin(0.15);
  //设置最低的一个 Item 与图片底端的距离
  rangeAxis.setLowerMargin(0.15);
  plot.setRangeAxis(rangeAxis);

  BarRenderer3D renderer = new BarRenderer3D();
  renderer.setBaseOutlinePaint(Color.BLACK);
  //设置 Wall 的颜色
  renderer.setWallPaint(Color.gray);
  //设置每种水果代表的柱的颜色
  renderer.setSeriesPaint(0, new Color(0, 0, 255));
  renderer.setSeriesPaint(1, new Color(0, 100, 255));
  renderer.setSeriesPaint(2, Color.GREEN);
  //设置每个地区所包含的平行柱的之间距离
  renderer.setItemMargin(0.1);
  //显示每个柱的数值，并修改该数值的字体属性
  renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());
  renderer.setItemLabelsVisible(true);
  plot.setRenderer(renderer);

  //设置柱的透明度
  plot.setForegroundAlpha(0.6f);
  //设置地区、销量的显示位置
  plot.setDomainAxisLocation(AxisLocation.TOP_OR_RIGHT);
  plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);

  String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, session);
  String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;
%>
<img src="<%= graphURL %>" width=500 height=300 border=0 usemap="#<%= filename %>">