Java和JFreechart面板

Question

我把下面的代码放在一起。 目前只要我运行该文件，图形在JFrame/Jpanel中创建，具体取决于我是否使用handleb1或handleb2。我的目标是运行文件框架创建一个图表，不包含任何值，但轴等设置，可以看到。然后我按Odiham或Wattisham并出现图表。我似乎无法解决如何做到这一点，请帮助。

package folderarray; 

import java.awt.Container; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.sql.Statement; 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.Date; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import org.jfree.chart.ChartFactory; 
import org.jfree.chart.ChartPanel; 
import org.jfree.chart.JFreeChart; 
import org.jfree.chart.axis.DateAxis; 
import static org.jfree.chart.demo.TimeSeriesChartDemo1.createDemoPanel; 
import org.jfree.chart.plot.XYPlot; 
import org.jfree.data.time.Hour; 
import org.jfree.data.time.TimeSeries; 
import org.jfree.data.time.TimeSeriesCollection; 
import org.jfree.data.xy.XYDataset; 


public class NewClass extends JFrame implements ActionListener{ 

Connection conexao = null; 
PreparedStatement pst= null; 
ResultSet rs = null; 
private JButton b1,b2,b3; 
private ChartPanel chartPanel; 


public static void main(String[] args) throws SQLException, ParseException { 
NewClass frame = new NewClass(); 
frame.createGUI(); 
frame.setSize(2500, 500);//changes size of frame 
frame.setVisible(true); 
} 


private void createGUI() throws SQLException, ParseException { 
setDefaultCloseOperation(EXIT_ON_CLOSE); 
Container window = getContentPane(); 
window.setLayout(null); 
b1 = new JButton("Odiham"); 
b2 = new JButton("Wattisham"); 

b1.setBounds(10,10,120,30); 
b1.addActionListener(this); 
b2.setBounds(10,80,120,30); 
b2.addActionListener(this); 
//b3 = new JButton("Wattisham"); 
//chartPanel = (ChartPanel) createDemoPanel(); 


//System.out.println(actionEvent.getSource()); 
JFreeChart chart=createChart(handleb2()); 



//final ChartPanel chartPanel=new ChartPanel(chart); 
//JFreeChart chart = new JFreeChart("hello",parent); 
ChartPanel panel = new ChartPanel(chart); 
panel.setFillZoomRectangle(true); 
panel.setMouseWheelEnabled(true); 
panel.setBounds(900,20,1200,400); 
//panel.repaint(); 

//JFreeChart chart = ChartFactory.createTimeSeriesChart(null, null, null, dataset, PlotOrientation.HORIZONTAL, true, true, true); 
//chartPanel = new ChartPanel(chart); 
window.add(panel); 
window.add(b1); 
window.add(b2); 
//window.add(b3); 

//b3.setBounds(10,90,120,30); 
//b1.addActionListener(this); 
} 

@Override 
public void actionPerformed (java.awt.event.ActionEvent e){ 
Object source = e.getSource(); 
if (source == b1){ 
    try {  
     handleb1(); 

    } catch (SQLException | ParseException ex) { 
     Logger.getLogger(NewClass.class.getName()).log(Level.SEVERE, null, ex); 
    } 
} 

if (source == b2){ 
    try {  
     handleb2(); 
    } catch (SQLException | ParseException ex) { 
     Logger.getLogger(NewClass.class.getName()).log(Level.SEVERE, null, ex); 
    } 
} 
} 

private static TimeSeriesCollection handleb1() throws SQLException, ParseException{ 

    Connection con; 
    con = null; 

     con = DriverManager.getConnection("jdbc:derby://localhost:1527/Solarradiation;user=------;password=------"); 

     if (!con.isClosed()) { 
      System.out.println("Successfully connected to the DataBase Server..."); 
     } 


     Statement statement; 
     statement = con.createStatement(); 

     String selectQuery = "select * from -------- where Station = 'Odiham'"; 
     //String selectQuery1 = "select * from ------- where Station = 'Wittering'"; 
     //String selectQuery2 = "select * from ---------- where Station = 'Wattisham'"; 
     ResultSet resultSet = null; 
     //ResultSet resultSet1 = null; 
     //ResultSet resultSet2 = null; 
     resultSet = statement.executeQuery(selectQuery); 

    //  resultSet2 = statement.executeQuery(selectQuery2); 

    TimeSeries s1 = new TimeSeries("Odiham"); 
    while (resultSet.next()) { 
    String fdata = (String) resultSet.getObject("fdate"); 
    String si = (String) resultSet.getObject("GLo_irra"); 
    SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm"); 
    Date dateI = sdf2.parse(fdata); 
Double production = Double.parseDouble(si); 
s1.addOrUpdate(new Hour(dateI), production); 
} 

resultSet.close(); 
/*resultSet1 = statement.executeQuery(selectQuery1); 
TimeSeries s2 = new TimeSeries("Wittering"); 
while (resultSet1.next()) { 
String fdata = (String) resultSet1.getObject("fdate"); 
String si = (String) resultSet1.getObject("GLo_irra"); 
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm"); 
Date dateI = sdf2.parse(fdata); 
Double production = Double.parseDouble(si); 
s2.addOrUpdate(new Hour(dateI), production); 
} 

resultSet1.close();*/ 


/*resultSet2 = statement.executeQuery(selectQuery2); 
TimeSeries s3 = new TimeSeries("Wattisham"); 
while (resultSet2.next()) { 
String fdata = (String) resultSet2.getObject("fdate"); 
String si = (String) resultSet2.getObject("GLo_irra"); 
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm"); 
Date dateI = sdf2.parse(fdata); 
Double production = Double.parseDouble(si); 
s3.addOrUpdate(new Hour(dateI), production); 
}  */ 


TimeSeriesCollection dataset = new TimeSeriesCollection(); 

dataset.addSeries(s1); 
// dataset.addSeries(s2); 
    // dataset.addSeries(s3); 
return dataset; 
} 

private static TimeSeriesCollection handleb2() throws SQLException, ParseException{ 

    Connection con; 
    con = null; 

     con = DriverManager.getConnection("jdbc:derby://localhost:1527/Solarradiation;user=-----;password=------"); 

     if (!con.isClosed()) { 
      System.out.println("Successfully connected to the DataBase Server..."); 
     } 
     Statement statement; 
     statement = con.createStatement(); 

     // String selectQuery = "----------------------"; 
     String selectQuery = "select * from --------- where Station = 'Wattisham'"; 
     //String selectQuery2 = "select * from ------------ where Station = 'Wattisham'"; 
     ResultSet resultSet = null; 
     //ResultSet resultSet1 = null; 
     //ResultSet resultSet2 = null; 
     resultSet = statement.executeQuery(selectQuery); 
    //  resultSet2 = statement.executeQuery(selectQuery2); 
    TimeSeries s1 = new TimeSeries("Wattisham"); 
    while (resultSet.next()) { 
    String fdata = (String) resultSet.getObject("fdate"); 
    String si = (String) resultSet.getObject("GLo_irra"); 
    SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm"); 
    Date dateI = sdf2.parse(fdata); 
Double production = Double.parseDouble(si); 
s1.addOrUpdate(new Hour(dateI), production); 
} 

resultSet.close(); 

/*resultSet1 = statement.executeQuery(selectQuery1); 
TimeSeries s2 = new TimeSeries("Wittering"); 
while (resultSet1.next()) { 
String fdata = (String) resultSet1.getObject("fdate"); 
String si = (String) resultSet1.getObject("GLo_irra"); 
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm"); 
Date dateI = sdf2.parse(fdata); 
Double production = Double.parseDouble(si); 
s2.addOrUpdate(new Hour(dateI), production); 
} 

resultSet1.close();*/ 


/*resultSet2 = statement.executeQuery(selectQuery2); 
TimeSeries s3 = new TimeSeries("Wattisham"); 
while (resultSet2.next()) { 
String fdata = (String) resultSet2.getObject("fdate"); 
String si = (String) resultSet2.getObject("GLo_irra"); 
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm"); 
Date dateI = sdf2.parse(fdata); 
Double production = Double.parseDouble(si); 
s3.addOrUpdate(new Hour(dateI), production); 
}  */ 


TimeSeriesCollection dataset = new TimeSeriesCollection(); 

dataset.addSeries(s1); 
// dataset.addSeries(s2); 
    // dataset.addSeries(s3); 

return dataset; 
} 

private static JFreeChart createChart(XYDataset dataset) throws SQLException, ParseException { 
JFreeChart chart = ChartFactory.createTimeSeriesChart("Solar Irradiation/Date","Date","w/m2",dataset,true,true,true); 
XYPlot plot = (XYPlot) chart.getPlot(); 
DateAxis axis = (DateAxis) plot.getDomainAxis(); 
axis.setDateFormatOverride(new SimpleDateFormat("yyyy-MM-dd")); 
return chart; 
} 



} 

Answer 1

给出一个空的数据集，时间序列图将使用轴的默认值，如下图所示。请注意，该域是一个DateAxis，以本地时区中的Java epoch开头;范围是NumberAxis的范围是0 .. 1。默认情况下，后续更改会根据需要自动调整轴，但如果提前知道轴，则可以指定一个固定范围，如here所示。

在下面显示的方法，该方法检查该问题是隔离，加入两个任意的初始值。 A flag控制series是否随后更新或增加到。

import java.awt.BorderLayout; 
import java.awt.Dimension; 
import java.awt.EventQueue; 
import java.awt.event.ActionEvent; 
import java.util.Random; 
import javax.swing.AbstractAction; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import org.jfree.chart.*; 
import org.jfree.data.time.Day; 
import org.jfree.data.time.TimeSeries; 
import org.jfree.data.time.TimeSeriesCollection; 
import org.jfree.data.xy.XYDataset; 

/** @See https://stackoverflow.com/a/30332903/230513 */ 
public class ChartPanelTest { 

    private static final Random r = new Random(); 
    private static final TimeSeries series = new TimeSeries("Data"); 
    private static Day d = new Day(); 
    private static boolean flag = true; 

    public static void main(String[] args) { 
     EventQueue.invokeLater(() -> { 
      JFrame f = new JFrame(); 
      f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
      series.add(d, 0); 
      d = (Day) d.next(); 
      series.add(d, 0); 
      XYDataset dataset = new TimeSeriesCollection(series); 
      JFreeChart chart = ChartFactory.createTimeSeriesChart(
       "Test", "Day", "Value", dataset, false, false, false); 
      ChartPanel chartPanel = new ChartPanel(chart) { 
       @Override 
       public Dimension getPreferredSize() { 
        return new Dimension(320, 240); 
       } 
      }; 
      f.add(chartPanel); 
      f.add(new JButton(new AbstractAction("Add") { 
       @Override 
       public void actionPerformed(ActionEvent e) { 
        if (flag) { 
         series.addOrUpdate(d, r.nextGaussian()); 
         flag = false; 
        } else { 
         d = (Day) d.next(); 
         series.add(d, r.nextGaussian()); 
        } 
       } 
      }), BorderLayout.SOUTH); 
      f.pack(); 
      f.setLocationRelativeTo(null); 
      f.setVisible(true); 
     }); 
    } 
}