JFreeChart(四.折线图.1)

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 getLineChart(HttpSession session)throws Exception{

//按月统计

TimeSeries timeSeries=new TimeSeries("某网站访问量统计",Month.class);

timeSeries.add(new Month(1,2015),100);

timeSeries.add(new Month(2,2015),200);

timeSeries.add(new Month(3,2015),800);

timeSeries.add(new Month(4,2015),500);

timeSeries.add(new Month(5,2015),400);

timeSeries.add(new Month(6,2015),1200);

timeSeries.add(new Month(7,2015),1700);

timeSeries.add(new Month(8,2015),500);

timeSeries.add(new Month(9,2015),600);

timeSeries.add(new Month(10,2015),300);

timeSeries.add(new Month(11,2015),800);

timeSeries.add(new Month(12,2015),700);


// 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"));

dateaxis.setTickUnit(new DateTickUnit(DateTickUnit.MONTH,1)); //一个月为间隔


//设置曲线是否显示数据节点

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;

     }

     
}
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