JFreeChart 折线图

﹏ヽ暗。殇╰゛Y 2022-07-16 09:56 158阅读 0赞

在我前面的博文讲到了JFreeChart报表图形：[JFreeChart 3D饼图][JFreeChart 3D]     [JFreeChart 柱形图][JFreeChart]

# 1.现在我们来讲讲JFreeChart-折线图： #

> 1.所需要的架包：
> 
> ![Center][]
> 
>  架包下载地址：[架包下载][Link 1] 因为是我上传的免费下载。
> 
> 下载后解压，所需的架包在lib文件夹中
> 
> 2.编写Servlet控制类：
> 
>     public static String genLineChart(HttpSession session)throws Exception{
>     		// A网站的访问量统计
>     		TimeSeries timeSeries=new TimeSeries("A网站访问量统计", Month.class);
>     		// 添加数据  如果你是从数据库中获取数据，你就写个循环塞值就行了。
>     		timeSeries.add(new Month(1,2013), 100);
>     		timeSeries.add(new Month(2,2013), 200);
>     		timeSeries.add(new Month(3,2013), 300);
>     		timeSeries.add(new Month(4,2013), 400);
>     		timeSeries.add(new Month(5,2013), 560);
>     		timeSeries.add(new Month(6,2013), 600);
>     		timeSeries.add(new Month(7,2013), 750);
>     		timeSeries.add(new Month(8,2013), 890);
>     		timeSeries.add(new Month(9,2013), 120);
>     		timeSeries.add(new Month(10,2013), 400);
>     		timeSeries.add(new Month(11,2013), 1200);
>     		timeSeries.add(new Month(12,2013), 1600);
>     		
>     		// B网站的访问量统计
>     		//如果有更多的就继续添加就行了
>     		TimeSeries timeSeries2=new TimeSeries("B网站访问量统计", Month.class);
>     		// 添加数据
>     		timeSeries2.add(new Month(1,2013), 50);
>     		timeSeries2.add(new Month(2,2013), 100);
>     		timeSeries2.add(new Month(3,2013), 150);
>     		timeSeries2.add(new Month(4,2013), 200);
>     		timeSeries2.add(new Month(5,2013), 220);
>     		timeSeries2.add(new Month(6,2013), 300);
>     		timeSeries2.add(new Month(7,2013), 340);
>     		timeSeries2.add(new Month(8,2013), 400);
>     		timeSeries2.add(new Month(9,2013), 450);
>     		timeSeries2.add(new Month(10,2013), 500);
>     		timeSeries2.add(new Month(11,2013), 70);
>     		timeSeries2.add(new Month(12,2013), 800);
>     		
>     		// 定义时间序列的集合
>     		TimeSeriesCollection lineDataset=new TimeSeriesCollection();
>     		lineDataset.addSeries(timeSeries);
>     		lineDataset.addSeries(timeSeries2);
>     		
>     		JFreeChart chart=ChartFactory.createTimeSeriesChart("访问量统计时间折线图", "月份", "访问量", lineDataset, true, true, true);
>     		
>     		//设置主标题
>     		chart.setTitle(new TextTitle("A,B网站访问量统计对比图", new Font("隶书", Font.ITALIC, 15))); 
>     		//设置子标题
>     		TextTitle subtitle = new TextTitle("2016年度", new Font("黑体", Font.BOLD, 12));
>     		chart.addSubtitle(subtitle); 
>     		chart.setAntiAlias(true); 
>     		
>     		//设置时间轴的范围。
>     		XYPlot plot = (XYPlot) chart.getPlot(); 
>     		DateAxis dateaxis = (DateAxis)plot.getDomainAxis();
>     		dateaxis.setDateFormatOverride(new java.text.SimpleDateFormat("M月"));
>     		dateaxis.setTickUnit(new DateTickUnit(DateTickUnit.MONTH,1)); 
>     		
>     		//设置曲线是否显示数据点
>     		XYLineAndShapeRenderer xylinerenderer = (XYLineAndShapeRenderer)plot.getRenderer();
>     		xylinerenderer.setBaseShapesVisible(true); 
>     		
>     		//设置曲线显示各数据点的值
>     		XYItemRenderer xyitem = plot.getRenderer(); 
>     		xyitem.setBaseItemLabelsVisible(true);
>     		xyitem.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_CENTER)); 
>     		xyitem.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
>     		xyitem.setBaseItemLabelFont(new Font("Dialog", 1, 12)); 
>     		plot.setRenderer(xyitem);
>     		
>     		//最后返回组成的折线图数值
>     		String fileName=ServletUtilities.saveChartAsPNG(chart, 700, 500, session);
>     		
>     		return fileName;
>     	}
> 
> 3. 编写JSP显示页面：
> 
>     <%@page import="com.java1234.chart.line.LineChart2"%>
>     <%@ page language="java" contentType="text/html; charset=utf-8"
>         pageEncoding="utf-8"%>
>     <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
>     <html>
>     <head>
>     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
>     <title>Insert title here</title>
>     </head>
>     <body>
>     <%
>     	String fileName=LineChart2.genLineChart(session);
>     	System.out.println(fileName);
>     %>
>     <img src="DisplayChart?filename=<%=fileName %>" width="700" height="500" border="0"/>
>     </body>
>     </html>
> 
> 4. 配置web.xml核心文件：
> 
>     <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>
> 
> 5.最后完成的显示效果：
> 
> ![Center 1][]

[JFreeChart 3D]: http://blog.csdn.net/lifupingcn/article/details/52814838
[JFreeChart]: http://blog.csdn.net/lifupingcn/article/details/52813948
[Center]: /images/20220716/8bc735a43d184c5981d2dac24579c361.png
[Link 1]: http://download.csdn.net/detail/lifupingcn/9653615
[Center 1]: /images/20220716/f2618e31222a42238a50a507551c8428.png