JFreeChart(四.折线图.1)

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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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