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JFreeChart线形图的简单应用

2024-09-11 09:56:32   217人阅读

JFreeChart的servlet配置就不赘述了！

新建生成线形图的类：

package com.loger.chart.line;

import java.awt.Font;

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;

public class LineChart1 {

    public static String genLineChart(HttpSession session)throws Exception{
        
        // 访问量统计
        TimeSeries timeSeries=new TimeSeries("某网站访问量统计", Month.class);
        // 添加数据
        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);
        
        // 定义时间序列的集合
        TimeSeriesCollection lineDataset=new TimeSeriesCollection();
        lineDataset.addSeries(timeSeries);
        
        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("某网站访问量统计", new Font("隶书", Font.ITALIC, 15))); 
        //设置子标题
        TextTitle subtitle = new TextTitle("2013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"));
        //右边的数字设置x轴的间隔
        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);
        
        String fileName=ServletUtilities.saveChartAsPNG(chart, 700, 500, session);
        
        return fileName;
    }
}

新建JSP页面：

<%@page import="com.loger.chart.line.LineChart1"%>
<%@ 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=LineChart1.genLineChart(session);
    System.out.println(fileName);
%>
<img src=http://www.mamicode.com/"DisplayChart?filename=<%=fileName %>" width="700" height="500" border="0"/>
</body>
</html>

运行结果：

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JFreeChart线形图的简单应用


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