近期jfreechart应用

内容：x轴为时间轴和双y轴的散点图形和折线图线
解决问题：
1.线图上标记（时间类型数据转化为long型）；
2.双y轴；
3.图例显示；
4.曲线可随意添加；
5.鼠标指向数据点，提示数据内容；
6.Applet 嵌入JSP中

package applet;

import java.awt.Color;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.swing.JApplet;
import javax.swing.JList;
import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.annotations.XYPointerAnnotation;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.labels.StandardXYToolTipGenerator;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.StandardXYItemRenderer;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.time.Second;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.TextAnchor;

import Util.MessageBean;

public class AstpApplet extends JApplet {

	public static String StrToGB2312(String str) {
		if (str == null)
			str = "";
		try {
			str = new String(str.getBytes("ISO-8859-1"), "GB2312");
		} catch (Exception ex) {
			return "";
		}
		return str;
	}
	private static String selectedParaNo = null;
	private static String beginDate = null;
	private static String endDate = null;
	private JList dwplList = null;
	public void init() {
		super.init();
//		selectedParaNo =  getParameter("SelectedParaNo");
//		beginDate = getParameter("BeginDate");
//		endDate =  getParameter("EndDate");
		selectedParaNo =  "para1;para2;para3;para4;para5;para6;para7;para8;para9;para10;para11";
		beginDate = "2010-05-31 07:48:55";
		endDate =  "2010-05-31 20:48:55";

	}

	public void start() {
		mainApplet();

	}

	public void destory() {
		super.destroy();

	}

	public void mainApplet() {
		JPanel chartPanel = createDemoPanel();
		chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
		setContentPane(chartPanel);
	}


	 public static JPanel createDemoPanel()
	  {	 
		 ArrayList dataRslt = new ArrayList();
		ServletToApplet servlettoApplet = new ServletToApplet();
		MessageBean messageBean = servlettoApplet.getParaNameAndNoMap(beginDate,endDate,selectedParaNo);
		dataRslt = (ArrayList)messageBean.getMsg();
		String[] pParaList = selectedParaNo.split(";");
	    JFreeChart localJFreeChart = createChart(dataRslt, pParaList);
	    return new ChartPanel(localJFreeChart);
	  }
	 private static JFreeChart createChart(List dwplList, String[] pParaList) {
			XYDataset xydataset = createPriceDataset(dwplList,pParaList);
			String s = "CHART1 TEST";
			JFreeChart jfreechart = ChartFactory.createTimeSeriesChart(s, "Date",
					"A", xydataset, true, true, false);
			XYPlot xyplot = (XYPlot) jfreechart.getPlot();
			DecimalFormat decimalformat2 = new DecimalFormat("00.00");
			NumberAxis numberaxis = (NumberAxis) xyplot.getRangeAxis();
			numberaxis.setNumberFormatOverride(decimalformat2);
			numberaxis.setAutoRangeIncludesZero(false);
			XYItemRenderer xyitemrenderer = xyplot.getRenderer();
			xyitemrenderer.setBaseToolTipGenerator(new StandardXYToolTipGenerator(
					"{0}: ({1}, {2})", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"),
					new DecimalFormat("0,000.00")));

			StandardXYItemRenderer standardxyitemrenderer1 = new StandardXYItemRenderer();
			standardxyitemrenderer1.setSeriesPaint(0, Color.blue);
			standardxyitemrenderer1.setBaseShapesVisible(true);
			NumberAxis numberaxis1 = new NumberAxis("T °C");
			numberaxis1.setAutoRangeIncludesZero(false);			
			numberaxis1.setNumberFormatOverride(decimalformat2);
			numberaxis1.setLabelPaint(Color.blue);
			numberaxis1.setTickLabelPaint(Color.blue);
			xyplot.setBackgroundPaint(new Color(205, 241, 197));
			xyplot.setRangeAxis(1, numberaxis1);
			xyplot.setDataset(1, createVolumeDataset(dwplList));
			xyplot.setRangeAxis(1, numberaxis1);
			xyplot.mapDatasetToRangeAxis(1, 1);
	        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			XYPointerAnnotation xypointerannotation2 = null;
			String CTime = "";
			double fvalue = 0.0f;
			double fmaxvalue = 0.0f;
			for (int i = 0; i < dwplList.size(); i++) {

				fvalue =((Double) ((Map) dwplList.get(i)).get("para11")).doubleValue();
				if(fmaxvalue < fvalue){
					CTime = (String) ((Map) dwplList.get(i)).get("Ctime");
					fmaxvalue = fvalue;				
				}

			}
			try {
				xypointerannotation2 = new XYPointerAnnotation(
						"T ("+ CTime + "," + fmaxvalue+")", (double)(format.parse(CTime).getTime()), fmaxvalue,
						1.5707963267948966D);				
				xypointerannotation2.setTextAnchor(TextAnchor.BOTTOM_LEFT);
				xypointerannotation2.setPaint(Color.black);
				xypointerannotation2.setArrowPaint(Color.black);				
				xypointerannotation2.setTextAnchor(TextAnchor.TOP_CENTER);
				standardxyitemrenderer1.addAnnotation(xypointerannotation2);
			} catch (ParseException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

			standardxyitemrenderer1.setBaseToolTipGenerator(new StandardXYToolTipGenerator(
					"{0}: ({1}, {2})", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"),
					new DecimalFormat("00.00")));
			xyplot.setRenderer(1, standardxyitemrenderer1);
			return jfreechart;
		}

		private static XYDataset createPriceDataset(List hbaceList,String[] pParaList) {
			try {
				final TimeSeriesCollection dataset = new TimeSeriesCollection();
				dataset.setDomainIsPointsInTime(true);
				TimeSeries timeseries[] = new TimeSeries[pParaList.length];
				for (int i = 0; i < pParaList.length; i++) {
					timeseries[i] = new TimeSeries(ParaNoToParaName(pParaList[i]),org.jfree.data.time.Second.class);				
				}		
				for (int i = 0; i < hbaceList.size(); i++) {
					String CTime = (String) ((Map) hbaceList.get(i)).get("Ctime");
					String[] strs = CTime.split("[- :]");
					int a = Integer.parseInt(strs[0]);
					int b = Integer.parseInt(strs[1]);
					int c = Integer.parseInt(strs[2]);
					int d = Integer.parseInt(strs[3]);
					int e = Integer.parseInt(strs[4]);
					int f = Integer.parseInt(strs[5].substring(0, 2));
					for (int j = 0; j < pParaList.length - 1; j++) {
						timeseries[j].add(new Second(f, e, d, c, b, a), (float)((Double) ((Map) hbaceList.get(i)).get(pParaList[j]))
								.doubleValue());					
					}
				}
				for (int i = 0; i < pParaList.length - 1; i++)
					dataset.addSeries(timeseries[i]);

				return dataset;

			} catch (Exception e) {
				e.printStackTrace();
			}
			return null;
		}

		private static IntervalXYDataset createVolumeDataset(List dwplList) {
			try {
				TimeSeries timeseries = new TimeSeries("T",
						org.jfree.data.time.Second.class);
				for (int i = 0; i < dwplList.size(); i++) {
					String CTime = (String) ((Map) dwplList.get(i)).get("Ctime");
					String[] strs = CTime.split("[- :]");
					int a = Integer.parseInt(strs[0]);
					int b = Integer.parseInt(strs[1]);
					int c = Integer.parseInt(strs[2]);
					int d = Integer.parseInt(strs[3]);
					int e = Integer.parseInt(strs[4]);
					int f = Integer.parseInt(strs[5].substring(0, 2));
					timeseries.add(new Second(f, e, d, c, b, a), (float)((Double) ((Map) dwplList.get(i)).get("para11"))
							.doubleValue());
				}
				return new TimeSeriesCollection(timeseries);
			} catch (Exception e) {
				e.printStackTrace();
			}
			return null;
		}

		public static String ParaNoToParaName(String pString)
		{
			String ParaName = "";
			if(null == pString || "".equals(pString))
			{
				return ParaName;
			}
			int cmd = Integer.valueOf(pString.substring(4,pString.length()));
			switch (cmd){
		      case 1:
					ParaName = "SUN_1020 nm";
					break;
				case 2:
					ParaName = "SUNI_1246 nm";
					break;
				case 3:
					ParaName = "SUN_870 nm";
					break;
				case 4:
					ParaName = "SUN_670 nm";
					break;
				case 5:
					ParaName = "SUN_440 nm";
					break;
				case 6:
					ParaName = "SUN_500 nm";
					break;
				case 7:
					ParaName = "SUNI_1020 nm";
					break;
				case 8:
					ParaName = "SUN_936 nm";
					break;
				case 9:
					ParaName = "SUN_380 nm";
					break;
				case 10:
					ParaName = "SUN_340 nm";
					break;
				case 11:
					ParaName = "Temperature";
					break;
			}
			return ParaName;
		}

}