JFreeChat学习曲线图的创建

 备注：导包

import java.awt.Color;
import java.awt.Font;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
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.title.LegendTitle;
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.RectangleInsets;
import org.jfree.ui.TextAnchor;

第一步：一样准备数据：

public static TimeSeries getTimeSeriesBy2013(){
  //访问量统计时间线：
    TimeSeries timeSeries = new TimeSeries("2013年度",Month.class);
    //构造数据集合
    timeSeries.add(new Month(1,2013),11200);
    timeSeries.add(new Month(2, 2013), 9000);
    timeSeries.add(new Month(3, 2013), 6200);
    timeSeries.add(new Month(4, 2013), 8200);
    timeSeries.add(new Month(5, 2013), 8200);
    timeSeries.add(new Month(6, 2013), 12200);
    timeSeries.add(new Month(7, 2013), 13200);
    timeSeries.add(new Month(8, 2013), 8300);
    timeSeries.add(new Month(9, 2013), 12400);
    timeSeries.add(new Month(10, 2013), 12500);
    timeSeries.add(new Month(11, 2013), 13600);
    timeSeries.add(new Month(12, 2013), 12500);
    return timeSeries;
   }
   
   public static TimeSeries getTimeSeriesBy2012(){
    TimeSeries timeSeries = new TimeSeries("2012年度",Month.class);
    timeSeries.add(new Month(1, 2013), 7200);
    timeSeries.add(new Month(2, 2013), 7000);
    timeSeries.add(new Month(3, 2013), 4200);
    timeSeries.add(new Month(4, 2013), 8200);
    timeSeries.add(new Month(5, 2013), 7300);
    timeSeries.add(new Month(6, 2013), 8200);
    timeSeries.add(new Month(7, 2013), 9200);
    timeSeries.add(new Month(8, 2013), 7300);
    timeSeries.add(new Month(9, 2013), 9400);
    timeSeries.add(new Month(10, 2013), 7500);
    timeSeries.add(new Month(11, 2013), 6600);
    timeSeries.add(new Month(12, 2013), 3500);
    return timeSeries;
   }

 
第二步：构造曲线数据集合

//访问量统计时间线：(两个季度)
    TimeSeries timeSeries2013 = this.getTimeSeriesBy2013();
    TimeSeries timeSeries2012 = this.getTimeSeriesBy2012();
    
    //时间曲线数据集合
    TimeSeriesCollection lineDataset = new TimeSeriesCollection();
    //把上面的时间线添加到数据集合之中
    lineDataset.addSeries(timeSeries2012);
    lineDataset.addSeries(timeSeries2013);

第三步 开始画线

//开始进行画线
    JFreeChart chart = ChartFactory.createTimeSeriesChart(
      "访问量统计时间线", 
      "月份", 
      "访问量", 
      lineDataset, 
      true, true, true)

第四步 设置样式，同时解决 口口 问题

4.1 X,Y轴标题 口口问题

 XYPlot plot = chart.getXYPlot();
    Font fn = new Font("黑体", Font.BOLD, 12);
    plot.getDomainAxis().setLabelFont(fn);
    plot.getRangeAxis().setLabelFont(fn);

4.2 样式设计

//设置网格背景颜色
    plot.setBackgroundPaint(Color.white);


    //设置网格竖线颜色
    plot.setDomainGridlinePaint(Color.pink);


    //设置网格横线颜色
    plot.setRangeGridlinePaint(Color.pink);


    //设置曲线图与 xy 轴的距离
    plot.setAxisOffset(new RectangleInsets(0D, 0D, 0D, 10D));


    //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 xyitem = plot.getRenderer();
    xyitem.setBaseItemLabelsVisible(true);
    xyitem.setBasePositiveItemLabelPosition(new ItemLabelPosition
      (ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));
    xyitem.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
    xyitem.setBaseItemLabelFont(new Font("黑体", 1, 14));
    plot.setRenderer(xyitem);



 //设置子标题
    TextTitle subtitle = new TextTitle("2013 / 2012年度", new Font("黑体", Font.BOLD, 12));
    chart.addSubtitle(subtitle);


    //设置主标题
    chart.setTitle(new TextTitle("blog 访问量统计", new Font("隶书", Font.ITALIC, 15)));
    chart.setAntiAlias(true);
    
  // 为图例说明设置字体
    Font LegendFont = new Font("楷体", Font.PLAIN, 18); 
      LegendTitle legend = chart.getLegend(0); 
       legend.setItemFont(LegendFont);

最后：发送到前台JSP：

res.setContentType("image/jpeg");// 将输出设置为image/jepg格式
ChartUtilities.writeChartAsJPEG(res.getOutputStream(), 1.0f, chart, 
                 800, 450, null);// 输出图表 

上图：