使用JFreeChart绘制2D和3D折线图

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;
	}
}