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 blocke.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;}}