jsp页面化JFreeChart图

原创于 2010-06-03 22:08:22 发布 · 110 阅读

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#jfreechart #JSP #HTML #Servlet

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本文介绍了一个使用Java和JFreeChart库创建3D柱状图的具体示例，展示了如何通过设置数据集、图表样式及布局参数来实现一个展示水果销量的3D柱状图。

//BarChart3D

<%@ page language="java" import="java.awt.Font,java.awt.Color" pageEncoding="UTF-8"%>
<%@ page import="org.jfree.chart.ChartFactory,
                org.jfree.chart.JFreeChart,
                org.jfree.chart.plot.PlotOrientation,
                org.jfree.chart.servlet.ServletUtilities,
                org.jfree.data.category.CategoryDataset,
                org.jfree.chart.plot.CategoryPlot,
                org.jfree.data.general.DatasetUtilities,
                org.jfree.chart.axis.CategoryAxis,
                org.jfree.chart.axis.ValueAxis,
                org.jfree.chart.renderer.category.BarRenderer3D,
                org.jfree.chart.labels.StandardCategoryItemLabelGenerator,
                org.jfree.chart.axis.AxisLocation,
                org.jfree.chart.renderer.category.CategoryItemRenderer"
                %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<%double[][] data = new double[][]{{672, 766, 223, 540, 126}, {325, 521, 210, 340, 106}, {332, 256, 523, 240, 526}};
String[] rowsKeys={"苹果","梨子","葡萄"};
String[] columnKeys={"北京","上海","广州","成都","深圳"};
CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowsKeys,columnKeys,data);
JFreeChart freechart = ChartFactory.createBarChart3D("水果销售量统计图","水果","销量",dataset,PlotOrientation.VERTICAL,true,true,true);
freechart.setBackgroundPaint(Color.LIGHT_GRAY);
freechart.getTitle().setPaint(Color.BLUE);
//1
CategoryPlot plot = freechart.getCategoryPlot();
CategoryAxis domainAxis = plot.getDomainAxis();
//设置距离图片左端距离
domainAxis.setLowerMargin(0.02);
//设置距离图片右端距离
domainAxis.setUpperMargin(0.02);
plot.setDomainAxis(domainAxis);

//2
ValueAxis rangeAxis = plot.getRangeAxis();
//设置最高的一个柱与图片顶端的距离
rangeAxis.setUpperMargin(0.08);
//设置最低的一个柱与图片底端的距离
rangeAxis.setLowerMargin(0.24);
plot.setRangeAxis(rangeAxis);

//3
BarRenderer3D bar = new BarRenderer3D();
bar.setBaseOutlinePaint(Color.BLACK);
//设置 Wall 的颜色
bar.setWallPaint(Color.darkGray);

//设置每种水果代表的柱的颜色
bar.setSeriesPaint(0,new Color(255,0,0));
bar.setSeriesPaint(1,new Color(0,255,0));
bar.setSeriesPaint(2,Color.BLUE);

//设置每种水果代表的柱的 Outline 颜色
bar.setSeriesOutlinePaint(0,Color.BLACK);
bar.setSeriesOutlinePaint(1,Color.BLACK);
bar.setSeriesOutlinePaint(2,Color.BLACK);
//设置每个地区所包含的平行柱的之间距离
bar.setItemMargin(0.02);
//显示每个柱的数值，并修改该数值的字体属性
bar.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());
bar.setDrawBarOutline(true);
bar.setIncludeBaseInRange(true);
bar.setItemLabelFont(new Font("华文新魏",Font.PLAIN,8));
bar.setItemLabelsVisible(true);
plot.setRenderer(bar);

plot.setForegroundAlpha(1.00f);
//设置地区、销量的显示位置
String filename=ServletUtilities.saveChartAsPNG(freechart,500,320,null,session);
String grapUrl=request.getContextPath()+"/show?filename=" + filename;%>

<img src="<%=grapUrl%>" width="600" height="400" border="0" usemap="#<%=filename%>">
<body>
</body>
</html>