JFreeChart 制作折线图分析数据

落日映苍穹つ 2022-06-12 03:08 223阅读 0赞

代码：

LineChart.java

package com.servlet;
    
    import java.awt.Font;
    import java.io.IOException;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    import org.jfree.chart.ChartFactory;
    import org.jfree.chart.JFreeChart;
    import org.jfree.chart.axis.DateAxis;
    import org.jfree.chart.axis.DateTickUnit;
    import org.jfree.chart.labels.ItemLabelAnchor;
    import org.jfree.chart.labels.ItemLabelPosition;
    import org.jfree.chart.labels.StandardXYItemLabelGenerator;
    import org.jfree.chart.plot.XYPlot;
    import org.jfree.chart.renderer.xy.XYItemRenderer;
    import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
    import org.jfree.chart.servlet.ServletUtilities;
    import org.jfree.chart.title.TextTitle;
    import org.jfree.data.time.Month;
    import org.jfree.data.time.TimeSeries;
    import org.jfree.data.time.TimeSeriesCollection;
    import org.jfree.ui.TextAnchor;
    
    
    
    @WebServlet("/LineChart")
    public class LineChart extends HttpServlet {
    	private static final long serialVersionUID = 1L;
           
        public LineChart() {
            super();
            // TODO Auto-generated constructor stub
        }
    	
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		doPost(request, response); 
    	}
    	
    	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 xyLineAndShapeRenderer = (XYLineAndShapeRenderer) plot.getRenderer();
    	     xyLineAndShapeRenderer.setBaseShapesVisible(true); 
    	     
    	     //设置曲线显示各数据点的值 
    	     XYItemRenderer xyItemRenderer = plot.getRenderer();
    	     xyItemRenderer.setBaseItemLabelsVisible(true);  
    	     xyItemRenderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_CENTER));   
    	     xyItemRenderer.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());  
    	     xyItemRenderer.setBaseItemLabelFont(new Font("Dialog", 1, 12));   
    	     plot.setRenderer(xyItemRenderer);  
    	     
    	     //返回组成的折线图数值
    	     String fileName=ServletUtilities.saveChartAsPNG(chart, 700, 500, session);  
    	     
    	     return fileName;  
    	}
    	
    
    	
    }

index.jsp

<%@page import="com.servlet.LineChart"%>
    <%@ 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>JFreeChart显示折线图</title>
    </head>
    <body>
    <%
      String fileName = LineChart.genLineChart(session);
      System.out.println(fileName); 
    %>
    <center>
    <img alt="这是一张数据分析的折线图" src="DisplayChart?filename=<%=fileName %>" width="700" height="500" border="0">
    </center>
    </body>
    </html>

截图：

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[Center]: /images/20220612/59a79aaa2b744b03a589cd0f787be9f5.png