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>

<%@ 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>

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

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true    plot.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false    LineAndShapeRenderer 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;   }  }