JFreeChart线形图的简单应用
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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="DisplayChart?filename=<%=fileName %>" width="700" height="500" border="0"/> </body> </html>
运行结果：
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