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使用JFreeChart绘制2D和3D折线图

发布时间:2022/12/10 17:59:59

完整版见https://jadyer.github.io/




这是一个Web Project


首先是web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><servlet><servlet-name>DisplayChart</servlet-name><!-- JFreechart提供的DisplayChart用来以流的形式从临时目录中将图片发送到浏览器上 --><!-- 使用时需要为其传送一个filename参数,详见com.jadyer.servlet.ImageServlet --><servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class></servlet><servlet><servlet-name>ImageServlet</servlet-name><servlet-class>com.jadyer.servlet.ImageServlet</servlet-class></servlet><servlet-mapping><servlet-name>DisplayChart</servlet-name><url-pattern>/servlet/DisplayChart</url-pattern></servlet-mapping><servlet-mapping><servlet-name>ImageServlet</servlet-name><url-pattern>/servlet/imageServlet</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list>
</web-app>

下面是用于选择生成图片类型的index.jsp

<%@ page language="java" pageEncoding="UTF-8"%>
<h1>查看统计报表</h1>
<h2><a href="<%=request.getContextPath()%>/servlet/imageServlet">普通样式</a></h2>
<h2><a href="<%=request.getContextPath()%>/servlet/imageServlet?style=3D">3D样式</a></h2>

下面是用于显示所生成的折线图的result.jsp

<%@ page language="java" pageEncoding="UTF-8"%>
<img src="${imageURL}" border="1"/>
<br/><br/>
<h2><a href="<%=request.getContextPath()%>/index.jsp">返回</a></h2>

最后是用于生成折线图的ImageServlet.java

package com.jadyer.servlet;import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.io.IOException;
import java.util.Random;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;/*** 使用JFreeChart绘制2D和3D折线图* @create Jun 25, 2013 9:58:11 PM* @author 玄玉<http://blog.csdn.net/jadyer>*/
public class ImageServlet extends HttpServlet {private static final long serialVersionUID = -2942367547538171657L;public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//显示样式(是否为3D效果)String style = request.getParameter("style");//生成的折线图的文件名String imageName = null;if(null!=style && "3D".equals(style)){//ChartUtilities.writeChartAsJPEG()是面向Java Application的//ServletUtilities.saveChartAsPNG()是面向Web开发的imageName = ServletUtilities.saveChartAsJPEG(createChart(true), 500, 300, request.getSession());}else{//saveChartAsPNG()的返回值是生成的图片的名字,它所生成的图片会保存在服务器的临时目录下//Tomcat6的临时目录是D:/Develop/apache-tomcat-6.0.36/temp/目录 imageName = ServletUtilities.saveChartAsJPEG(createChart(false), 500, 300, request.getSession());}//获取图片的路径(此时JFreechart会根据filename到服务器的临时目录中寻找图片)String imageURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + imageName;request.setAttribute("imageURL", imageURL);request.getRequestDispatcher("/result.jsp").forward(request, response);}/*** 创建数据集*/private CategoryDataset createDataSet() {//图例名称String[] line = {"kaspersky", "Nod32", "360"};//类别String[] category = {"2008年", "2009年", "2010年", "2011年", "2012年"};DefaultCategoryDataset dataSet = new DefaultCategoryDataset();//向数据集中添加数据for(int i=0; i<line.length; i++){for(int j=0; j<category.length; j++){dataSet.addValue(100000 + new Random().nextInt(100000), line[i], category[j]);}}return dataSet;}/*** 生成制图对象* @param is3D 是否为3D效果*/private JFreeChart createChart(boolean is3D){JFreeChart chart = null;if(is3D){//图表标题,X轴标题,Y轴标题,绘图数据集,绘制方向,显示图例,采用标准生成器,生成链接chart = ChartFactory.createLineChart3D("2008-2012年优秀杀毒软件杀毒数量统计", "杀毒软件", "查杀病毒数量",this.createDataSet(), PlotOrientation.VERTICAL, true, true, false);}else{chart = ChartFactory.createLineChart("2008-2012年优秀杀毒软件杀毒数量统计", "杀毒软件", "查杀病毒数量",this.createDataSet(), PlotOrientation.VERTICAL, true, true, false);}chart.getTitle().setFont(new Font("隶书", Font.BOLD, 23));      //设置标题字体chart.getLegend().setItemFont(new Font("宋体", Font.BOLD, 15)); //设置图例类别字体chart.setBackgroundPaint(new Color(192, 228, 106));            //设置背景色CategoryPlot plot = chart.getCategoryPlot();                           //获取绘图区对象plot.getDomainAxis().setLabelFont(new Font("宋体", Font.BOLD, 15));     //设置横轴字体plot.getDomainAxis().setTickLabelFont(new Font("宋体", Font.BOLD, 15)); //设置坐标轴标尺值字体plot.getRangeAxis().setLabelFont(new Font("宋体", Font.BOLD, 15));      //设置纵轴字体plot.setBackgroundPaint(Color.WHITE);   //设置绘图区背景色plot.setRangeGridlinePaint(Color.RED);  //设置水平方向背景线颜色plot.setRangeGridlinesVisible(true);    //设置是否显示水平方向背景线,默认值为trueplot.setDomainGridlinePaint(Color.RED); //设置垂直方向背景线颜色plot.setDomainGridlinesVisible(true);   //设置是否显示垂直方向背景线,默认值为falseLineAndShapeRenderer renderer = (LineAndShapeRenderer)plot.getRenderer(); //获取折线对象BasicStroke realLine = new BasicStroke(1.6f); //设置实线float dashes[] = {8.0f};                      //定义虚线数组//线条粗细,端点风格,折点风格,折点处理办法,虚线数组,虚线偏移量BasicStroke brokenLine = new BasicStroke(1.6f, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_MITER, 8.0f, dashes, 0.0f);renderer.setSeriesStroke(1, brokenLine); //利用虚线绘制renderer.setSeriesStroke(2, brokenLine); //利用虚线绘制renderer.setSeriesStroke(3, realLine);   //利用实线绘制return chart;}
}

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