1. 依赖包
2. XML 文件配置
<servlet>
<servlet-name>DisplayChart</servlet-name>
<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DisplayChart</servlet-name>
<url-pattern>/DisplayChart</url-pattern>
</servlet-mapping>
3. 示例
3.1 平面图
package com.zth;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.general.DefaultPieDataset;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.text.NumberFormat;
/**
* @author zth
* @Date 2019-05-24 23:13
*/
public class PieChart01 {
public static String getPieChart(HttpSession session) throws Exception{
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("java",0.15876);
dataset.setValue("C",0.12424);
dataset.setValue("python",0.07574);
dataset.setValue("其他",0.64126);
JFreeChart chart = ChartFactory.createPieChart("编程语言排行",dataset,true,true,true);
// 副标题
chart.addSubtitle(new TextTitle("2019年2月"));
PiePlot piePlot = (PiePlot)chart.getPlot();
piePlot.setLabelFont(new Font("宋体",0,11));
// 设置饼图是圆的（true），还是椭圆的（false）；默认为true
piePlot.setCircular(true);
// 没有数据的时候显示的内容
piePlot.setNoDataMessage("无数据显示");
// {0} 表示选项， {1} 表示数值， {2} 表示所占比例
// {0}:({1}.{2})
// {{0}={1}({2})
StandardPieSectionLabelGenerator standarPieIG = new StandardPieSectionLabelGenerator(
"{0}({2})", NumberFormat.getNumberInstance(), NumberFormat.getPercentInstance());
piePlot.setLabelGenerator(standarPieIG);
// 突出显示
piePlot.setExplodePercent("java",0.15876);
String fileName = ServletUtilities.saveChartAsPNG(chart,400,300,null,session);
return fileName;
}
}
jsp 引用：
<center>
<%
String fileName= PieChart01.getPieChart(session);
%>
<img src="DisplayChart?filename=<%=fileName %>" border="0"/>
</center>
效果：
3.2 3D图
package com.zth;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.plot.PiePlot3D;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.util.Rotation;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.text.NumberFormat;
/**
* @author zth
* @Date 2019-05-24 23:13
*/
public class PieChart02 {
public static String getPieChart(HttpSession session) throws Exception{
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("java",0.15876);
dataset.setValue("C",0.12424);
dataset.setValue("python",0.07574);
dataset.setValue("其他",0.64126);
JFreeChart chart = ChartFactory.createPieChart3D("编程语言排行",dataset,true,true,true);
// 副标题
chart.addSubtitle(new TextTitle("2019年2月"));
PiePlot piePlot = (PiePlot)chart.getPlot();
piePlot.setLabelFont(new Font("宋体",0,11));
// 设置饼图是圆的（true），还是椭圆的（false）；默认为true
piePlot.setCircular(false);
// 没有数据的时候显示的内容
piePlot.setNoDataMessage("无数据显示");
// {0} 表示选项， {1} 表示数值， {2} 表示所占比例
// {0}:({1}.{2})
// {{0}={1}({2})
StandardPieSectionLabelGenerator standarPieIG = new StandardPieSectionLabelGenerator(
"{0}({2})", NumberFormat.getNumberInstance(), NumberFormat.getPercentInstance());
piePlot.setLabelGenerator(standarPieIG);
PiePlot3D piePlot3D = (PiePlot3D) chart.getPlot();
//设置开始角度
piePlot3D.setStartAngle(120D);
//设置方向为”顺时针方向“
piePlot3D.setDirection(Rotation.CLOCKWISE);
//设置透明度，0.5F为半透明，1为不透明，0为全透明
piePlot3D.setForegroundAlpha(0.8F);
String fileName = ServletUtilities.saveChartAsPNG(chart,400,300,null,session);
return fileName;
}
}
效果：
