简单实现3D柱状图
1package yh.JFreeChart; 2 3import java.awt.Color; 4import java.awt.Font; 5 6import org.jfree.chart.ChartFactory; 7import org.jfree.chart.ChartFrame; 8import org.jfree.chart.JFreeChart; 9import org.jfree.chart.axis.CategoryAxis; 10import org.jfree.chart.axis.NumberAxis; 11import org.jfree.chart.labels.ItemLabelAnchor; 12import org.jfree.chart.labels.ItemLabelPosition; 13import org.jfree.chart.labels.StandardCategoryItemLabelGenerator; 14import org.jfree.chart.plot.CategoryPlot; 15import org.jfree.chart.plot.PlotOrientation; 16import org.jfree.chart.renderer.category.BarRenderer3D; 17import org.jfree.chart.title.LegendTitle; 18import org.jfree.chart.title.TextTitle; 19import org.jfree.data.category.CategoryDataset; 20import org.jfree.data.general.DatasetUtilities; 21import org.jfree.ui.TextAnchor; 22 23/** 24 * 25 * @Title:JFreeChart实现柱状图 26 * @Description:Comment for created type 27 * @author 张颖辉 28 * @date 2017年1月24日上午10:43:44 29 * @version 1.0 30 */ 31public class JFreeChartPillar { 32 /** 33 * 获得数据集。 34 * 35 * @return org.jfree.data.category.CategoryDataset 36 */ 37 private static CategoryDataset getDataset1() { 38 double[][] data = new double[][] { { 751, 800, 260, 600, 200 }, { 400, 560, 240, 300, 150 }, 39 { 600, 450, 620, 220, 610 } }; 40 String[] rowKeys = { "CPU", "硬盘", "内存" }; 41 String[] columnKeys = { "北京", "上海", "广州", "南京", "深圳" }; 42 CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data); 43 return dataset; 44 } 45 46 /** 47 * 生成柱状图。 48 */ 49 public static void main(String[] args) { 50 String title = "统计表"; 51 // 获得数据集 52 CategoryDataset dataset = getDataset1(); 53 JFreeChart chart = ChartFactory.createBarChart3D(title, // 图表标题 54 "时间", // 目录轴的显示标签 55 "次数", // 数值轴的显示标签 56 dataset, // 数据集 57 PlotOrientation.VERTICAL, // 图表方向：水平、垂直 58 true, // 是否显示图例 59 true, // 是否生成工具（提示） 60 false // 是否生成URL链接 61 ); 62 // 设置标题字体 63 Font font = new Font("宋体", Font.BOLD, 18); 64 TextTitle textTitle = new TextTitle(title); 65 textTitle.setFont(font); 66 chart.setTitle(textTitle); 67 chart.setTextAntiAlias(false); 68 // 设置背景色 69 chart.setBackgroundPaint(new Color(255, 255, 255)); 70 // 设置图例字体 71 LegendTitle legend = chart.getLegend(0); 72 legend.setItemFont(new Font("宋体", Font.TRUETYPE_FONT, 14)); 73 // 获得柱状图的Plot对象 74 CategoryPlot plot = chart.getCategoryPlot(); 75 BarRenderer3D customBarRenderer = (BarRenderer3D) plot.getRenderer(); 76 // 取得横轴 77 CategoryAxis categoryAxis = plot.getDomainAxis(); 78 // 设置横轴显示标签的字体 79 categoryAxis.setLabelFont(new Font("宋体", Font.BOLD, 16)); 80 // 设置横轴标记的字体 81 categoryAxis.setTickLabelFont(new Font("宋休", Font.TRUETYPE_FONT, 16)); 82 // 取得纵轴 83 NumberAxis numberAxis = (NumberAxis) plot.getRangeAxis(); 84 // 设置纵轴显示标签的字体 85 numberAxis.setLabelFont(new Font("宋体", Font.BOLD, 16)); 86 numberAxis.setTickLabelFont(new Font("Fixedsys", Font.PLAIN, 13)); 87 customBarRenderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());// 显示每个柱的数值 88 customBarRenderer.setBaseItemLabelsVisible(true); 89 // 注意：此句很关键，若无此句，那数字的显示会被覆盖，给人数字没有显示出来的问题 90 customBarRenderer.setBasePositiveItemLabelPosition( 91 new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_CENTER)); 92 ChartFrame frame = new ChartFrame(title, chart, true); 93 frame.pack(); 94 frame.setVisible(true); 95 } 96}
运行结果：
说明：中文标题文字可能不显示出现方格，解决办法是设置字体。
将图片写入流中的示例：
1package org.ruigai.util; 2 3import java.awt.Color; 4import java.awt.Font; 5import java.io.FileOutputStream; 6import java.io.IOException; 7import java.io.OutputStream; 8import java.text.DecimalFormat; 9import java.text.FieldPosition; 10import java.text.NumberFormat; 11import java.text.ParsePosition; 12 13import org.jfree.chart.ChartFactory; 14import org.jfree.chart.ChartFrame; 15import org.jfree.chart.ChartUtilities; 16import org.jfree.chart.JFreeChart; 17import org.jfree.chart.axis.CategoryAxis; 18import org.jfree.chart.axis.CategoryLabelPositions; 19import org.jfree.chart.axis.NumberAxis; 20import org.jfree.chart.axis.ValueAxis; 21import org.jfree.chart.labels.ItemLabelAnchor; 22import org.jfree.chart.labels.ItemLabelPosition; 23import org.jfree.chart.labels.StandardCategoryItemLabelGenerator; 24import org.jfree.chart.plot.CategoryPlot; 25import org.jfree.chart.plot.PlotOrientation; 26import org.jfree.chart.renderer.category.BarRenderer3D; 27import org.jfree.chart.title.LegendTitle; 28import org.jfree.data.category.CategoryDataset; 29import org.jfree.data.general.DatasetUtilities; 30import org.jfree.ui.TextAnchor; 31 32public class JFreeChartPillar { 33 private String title;// 大标题（如：什么什么图） 34 private String categoryAxisLabel;// X轴标题（如：按季度） 35 private String valueAxisLabel;// Y轴标题 （如：销量） 36 private OutputStream outputStream;// 接受数据的输出流 37 private CategoryDataset dataset;// 数据集对象 38 39 public JFreeChartPillar() { 40 super(); 41 } 42 43 public JFreeChartPillar(String title, String categoryAxisLabel, 44 String valueAxisLabel, OutputStream outputStream, 45 CategoryDataset dataset) { 46 super(); 47 this.title = title; 48 this.categoryAxisLabel = categoryAxisLabel; 49 this.valueAxisLabel = valueAxisLabel; 50 this.outputStream = outputStream; 51 this.dataset = dataset; 52 } 53 54 public String getCategoryAxisLabel() { 55 return categoryAxisLabel; 56 } 57 58 public void setCategoryAxisLabel(String categoryAxisLabel) { 59 this.categoryAxisLabel = categoryAxisLabel; 60 } 61 62 public CategoryDataset getDataset() { 63 return dataset; 64 } 65 66 public void setDataset(CategoryDataset dataset) { 67 this.dataset = dataset; 68 } 69 70 public String getTitle() { 71 return title; 72 } 73 74 public void setTitle(String title) { 75 this.title = title; 76 } 77 78 public String getValueAxisLabel() { 79 return valueAxisLabel; 80 } 81 82 public void setValueAxisLabel(String valueAxisLabel) { 83 this.valueAxisLabel = valueAxisLabel; 84 } 85 86 public OutputStream getOutputStream() { 87 return outputStream; 88 } 89 90 public void setOutputStream(OutputStream outputStream) { 91 this.outputStream = outputStream; 92 } 93 94 public void drawAsPNG() throws IOException { 95 // 创建3D柱形图标 96 JFreeChart jfreechart = ChartFactory.createBarChart3D(title, 97 categoryAxisLabel, valueAxisLabel, dataset, 98 PlotOrientation.VERTICAL, true, true, false); 99 // 设置标题字体 100 jfreechart.getTitle().setFont(new Font("隶书", Font.ITALIC, 20)); 101 // 获得柱形图表情节对象 102 CategoryPlot categoryPlot = (CategoryPlot) jfreechart.getPlot(); 103 104 // 设置网格线可见 105 categoryPlot.setDomainGridlinesVisible(true); 106 107 /********/ 108 NumberAxis numberAxis = (NumberAxis) categoryPlot.getRangeAxis(); 109 numberAxis.setRange(0.0, 100.0); 110 numberAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); 111 112 /********/ 113 114 // 获得x轴对象 115 CategoryAxis categoryAxis = categoryPlot.getDomainAxis(); 116 // 设置x轴显示的分类名称的显示位置，如果不设置则水平显示 117 // 设置后，可以斜像显示，但分类角度，图表空间有限时，建议采用 118 categoryAxis.setCategoryLabelPositions(CategoryLabelPositions 119 .createUpRotationLabelPositions(0.39269908169872414D)); 120 categoryAxis.setLabelFont(new Font("楷体", Font.BOLD, 14)); // X轴标题 121 categoryAxis.setTickLabelFont(new Font("宋体", Font.BOLD, 12)); // x轴下标 122 // 种类外部的间距 123 categoryAxis.setCategoryMargin(0.2); 124 125 // 柱形渲染器 126 BarRenderer3D renderer = (BarRenderer3D) categoryPlot.getRenderer(); 127 renderer.setDrawBarOutline(false);// 设置不显示边框线 128 renderer.setItemMargin(0.1);// 分类内部间距 129 // 显示柱形数值 130 renderer 131 .setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator()); 132 renderer.setBaseItemLabelsVisible(true); 133 renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition( 134 ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_CENTER)); 135 136 // 获取柱状 137 ValueAxis rangeAxis = categoryPlot.getRangeAxis(); 138 rangeAxis.setLabelFont(new Font("楷体", Font.BOLD, 14)); // Y轴标题 139 140 // 图示项字体 141 LegendTitle legend = jfreechart.getLegend(); 142 Font labelFont = new Font("宋体", Font.BOLD, 12); 143 legend.setItemFont(labelFont); 144 145 // 将图表已数据流的方式返回给客户端 146 ChartUtilities.writeChartAsPNG(outputStream, jfreechart, 500, 300); 147 } 148 149 public static void main(String[] agrs) throws IOException { 150 double[][] data = new double[][] { { 75.1, 80.8, 26.9, 60.5 }, 151 { 40.3, 56.3, 24.5, 30.9 } }; 152 String[] rowKeys = {"上季", "本季"}; 153 String[] columnKeys = {"准度练习", "走位练习", "围球练习", "K球练习"}; 154 CategoryDataset dataset = DatasetUtilities.createCategoryDataset( 155 rowKeys, columnKeys, data); 156 // 打开一个输出流 157 OutputStream outputStream = new FileOutputStream("D:\\BarChart.png"); 158 new JFreeChartPillar("专项成功率统计", null, "成功率(%)", outputStream, 159 dataset).drawAsPNG(); 160 } 161}
运行结果：
还未解决的问题：怎么将显示的数值和左侧标尺的数值显示为百分比？若您知道，请回复告知。
上面的解决办法只是制定了标尺的显示范围为1-100，通过Y轴标题说明是百分比。