createlinejingqi.java

本程序主要是实现了JFreeChart的图形显示！

package com.kai.jfc;

import java.awt.Color;
import java.awt.Font;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;

import javax.servlet.http.HttpSession;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.labels.StandardXYToolTipGenerator;
import org.jfree.chart.plot.IntervalMarker;
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.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.Layer;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.TextAnchor;

/**
 * 类文件：CreateLineJingQi.java
 * @author 作者: 王凯 E-mail: [e-mail]
 * @version 创建时间：Sep 10, 2008 2:06:10 PM
 * 类 CreateLineJingQi 的作用：
 */

public class CreateLineJingQi 
{
	private XYDataset createDateSet()
	{
		TimeSeriesCollection dataset = new TimeSeriesCollection();// 时间曲线数据集合
		TimeSeries s1 = new TimeSeries("历史曲线", Day.class);// 创建时间数据源，每一个//TimeSeries在图上是一条曲线
		
		// s1.add(new Day(day,month,year),value),添加数据点信息
		s1.add(new Day(1, 2, 2006), 123.51);
		s1.add(new Day(2, 2, 2006), 122.1);
		s1.add(new Day(3, 2, 2006), 120.86);
		s1.add(new Day(4, 2, 2006), 122.50);
		s1.add(new Day(5, 2, 2006), 123.12);
		s1.add(new Day(6, 2, 2006), 123.9);
		s1.add(new Day(7, 2, 2006), 124.47);
		s1.add(new Day(8, 2, 2006), 124.08);
		s1.add(new Day(9, 2, 2006), 123.55);
		s1.add(new Day(10, 2, 2006), 122.53);

		dataset.addSeries(s1);
		//dataset.setDomainIsPointsInTime(true);
		return dataset;
	}
	public String getLineJingQi(HttpSession session, PrintWriter pw) 
	{
		XYDataset dataset = this.createDateSet();// 建立数据集
		String fileName = null;
		// 建立JFreeChart
		JFreeChart chart = ChartFactory.createTimeSeriesChart("JFreeChart时间曲线序列图", // title
							"Date", //   x轴上的标签
							"Price", //  y轴上的标签
							dataset, // data
							true, // create legend?
							true, // generate tooltips?
							false // generate URLs?
							);
	   // 设置JFreeChart的显示属性,对图形外部部分进行调整
	   chart.setBackgroundPaint(Color.WHITE);// 设置曲线图背景色
	   // 设置字体大小，形状
	   Font font = new Font("宋体", Font.BOLD, 16);
	   TextTitle title = new TextTitle("JFreeChart时间曲线序列图", font);
	   chart.setTitle(title);
	
	   XYPlot plot = (XYPlot) chart.getPlot(); //获取图形的画布
	   plot.setBackgroundPaint(Color.WHITE);   //设置网格背景色
	   plot.setDomainGridlinePaint(Color.GRAY); //设置网格竖线(Domain轴)颜色
	   plot.setRangeGridlinePaint(Color.GRAY); //设置网格横线颜色
	   plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0)); //设置曲线图与xy轴的距离
	   plot.setDomainCrosshairVisible(true);
	   plot.setRangeCrosshairVisible(true);
	   
	   IntervalMarker intervalmarker = new IntervalMarker(121.0D, 121.5D);
       intervalmarker.setLabel("Target Range");
       intervalmarker.setLabelFont(new Font("SansSerif", 2, 11));
       intervalmarker.setLabelAnchor(RectangleAnchor.LEFT);
       intervalmarker.setLabelTextAnchor(TextAnchor.CENTER_LEFT);
       intervalmarker.setPaint(Color.BLUE);
       plot.addRangeMarker(intervalmarker, Layer.BACKGROUND);
       
	   IntervalMarker intervalmarker0 = new IntervalMarker(121.5D, 122.0D);
       intervalmarker0.setLabelFont(new Font("SansSerif", 2, 11));
       intervalmarker0.setLabelAnchor(RectangleAnchor.LEFT);
       intervalmarker0.setPaint(Color.CYAN);
       plot.addRangeMarker(intervalmarker0, Layer.BACKGROUND);

	   IntervalMarker intervalmarker1 = new IntervalMarker(122.5D, 123.5D);
       intervalmarker1.setLabel("Target Range");
       intervalmarker1.setLabelFont(new Font("SansSerif", 2, 11));
       intervalmarker1.setLabelAnchor(RectangleAnchor.LEFT);
       intervalmarker1.setLabelTextAnchor(TextAnchor.CENTER_LEFT);
       intervalmarker1.setPaint(Color.yellow);
       plot.addRangeMarker(intervalmarker1, Layer.BACKGROUND);
       
       IntervalMarker intervalmarker3 = new IntervalMarker(122.0D, 122.5D);
       intervalmarker3.setLabel("Target Range");
       intervalmarker3.setLabelFont(new Font("SansSerif", 2, 11));
       intervalmarker3.setLabelAnchor(RectangleAnchor.LEFT);
       intervalmarker3.setLabelTextAnchor(TextAnchor.CENTER_LEFT);
       intervalmarker3.setPaint(Color.GREEN);
       plot.addRangeMarker(intervalmarker3, Layer.BACKGROUND);
       
       
	   IntervalMarker intervalmarker2 = new IntervalMarker(123.5D, 124.5D);
       intervalmarker2.setLabel("Target Range");
       intervalmarker2.setLabelFont(new Font("SansSerif", 2, 11));
       intervalmarker2.setLabelAnchor(RectangleAnchor.LEFT);
       intervalmarker2.setLabelTextAnchor(TextAnchor.CENTER_LEFT);
       intervalmarker2.setPaint(Color.red);
       plot.addRangeMarker(intervalmarker2, Layer.BACKGROUND);
	   
	   XYItemRenderer r = plot.getRenderer();
	   if (r instanceof XYLineAndShapeRenderer) 
	   {
		   XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) r;
		   // renderer.setDefaultShapesVisible(true);
		   // renderer.setDefaultShapesFilled(true);
		   renderer.setShapesFilled(true);
		   renderer.setShapesVisible(true);// 设置曲线是否显示数据点
	   }
	
	   // 设置Y轴
	   NumberAxis numAxis = (NumberAxis) plot.getRangeAxis();
	   NumberFormat numFormater = NumberFormat.getNumberInstance();
	   numFormater.setMinimumFractionDigits(2);
	   numAxis.setNumberFormatOverride(numFormater);
	   
	   // 设置提示信息
	   StandardXYToolTipGenerator tipGenerator = new StandardXYToolTipGenerator("({1},{2})", new SimpleDateFormat("yyyy年MM月dd日"), numFormater);
	   r.setBaseToolTipGenerator(tipGenerator);
	
	   // 设置X轴（日期轴）
	   DateAxis axis = (DateAxis) plot.getDomainAxis();
	   axis.setDateFormatOverride(new SimpleDateFormat("yyyy年MM"));
	   
	   ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
	   try 
	   {
		   fileName = ServletUtilities.saveChartAsPNG(chart, 500, 300, info,session);// 生成图片
		   // Write the image map to the PrintWriter
		   ChartUtilities.writeImageMap(pw, fileName, info, false);
	   } catch (IOException e) {
		   e.printStackTrace();
	   }
	   pw.flush();
	   return fileName;// 返回生成图片的文件名
	}
}