如何在java后面的JFrame中运行TimerTask

Question

我创建了应用程序（GUI JFrame表单类），但我试图运行一个包含使用java.util.TimerTask执行数据扫描的命令的方法。我想通过JCheckBoxMenuItem运行该方法，并在我打勾checkBoxMenuItem时运行。问题是，当我检查'checkBoxMenuItem`时，扫描方法仍在运行，但我无法再访问JFrame（GUI）。

import Database.KoneksiDatabase2; 
import Design.ClButtonTransparan; 
import Design.JPanelWithImage; 
import Proses.Data.DebitDiberikan; 
import Proses.Data.DebitKebutuhan; 
import Proses.Data.DebitTersedia; 
import Proses.Data.AutoScanNReply; 
import Proses.Data.CurahHujan; 
import Proses.Data.DataKirim; 
import Proses.Data.DataMasuk; 
import Proses.Data.Faktor_K; 
import java.awt.Color; 
import java.awt.Component; 
import java.awt.Font; 
import java.awt.Graphics2D; 
import java.awt.Image; 
import java.awt.Point; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.ItemEvent; 
import java.awt.event.ItemListener; 
import java.awt.image.BufferedImage; 
import java.io.File; 
import java.io.IOException; 
import java.sql.Connection; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.text.SimpleDateFormat; 
import java.util.Date; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.imageio.ImageIO; 
import javax.swing.ImageIcon; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JMenuItem; 
import javax.swing.JPanel; 
import javax.swing.JPopupMenu; 
import javax.swing.SwingConstants; 
import javax.swing.border.EmptyBorder; 
import javax.swing.border.LineBorder; 
import java.util.Timer; 

public class FormPAI extends javax.swing.JFrame { 
    private JPanel contentPane, panel1, panelJam; 
    private JLabel lbtotQs, lbtotQb, lbtotQa, lbfaktorK, lbQa1, lbQa2, lbQa3; 
    private JLabel lbQa4, lbQa5, lbQa6, lbQa7, lbQa8, lbQa9, lbQa10, lbQa11; 
    private JLabel lbQa12, lbQb1, lbQb2, lbQb3, lbQb4, lbQb5, lbQb6, lbQb7; 
    private JLabel lbQb8, lbQb9, lbQb10, lbQb11, lbQb12, lbTotQ; 
    private JButton btn1, btn2, btn3, btn4, btn5, btn6; 
    //public Timer timer2 = null; 
    private JPopupMenu popUp; 
    private JMenuItem tulisPesan, inbox, kotakKeluar, pesanTerkirim; 
    ActionListener aksi, aksiTulisPesan, aksiInbox, aksikotakKeluar, aksiPesanTerkirim; 
    private Timer timer; 

    public FormPAI() throws IOException, SQLException { 

     initComponents(); 
     setTitle("Pembagian Air Irigasi"); 
     setResizable(false); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setBounds(100, 100, 700, 650); 
     BufferedImage img = ImageIO.read(new File("C:\\Users\\X201\\Documents\\NetBeansProjects\\PembagianAirIrigasi\\src\\img\\bacground3.jpg")); 
     contentPane = new JPanelWithImage(img); 
     contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
    setContentPane(contentPane); 
    contentPane.setLayout(null); 
     setLocationRelativeTo(null); 

     btnClose(); 

     BufferedImage imgSkema = ImageIO.read(new File("C:\\Users\\X201\\Documents\\NetBeansProjects\\PembagianAirIrigasi\\src\\img\\baturiti3.png")); 
     panel1 = new JPanelWithImage(resize(imgSkema, 670, 420)); 
     panel1.setBorder(new LineBorder(new Color(0, 0, 0), 1, true)); 
     panel1.setBounds(5, 115, 680, 425); 
     contentPane.add(panel1); 

     ClockLabel dateLable = new ClockLabel("date"); 
     ClockLabel timeLable = new ClockLabel("time"); 
//  ClockLabel dayLable = new ClockLabel("day"); 
     panelJam = new JPanel(); 
     panelJam.setBounds(545, 541, 140, 55); 
     panelJam.setBackground(Color.black); 
     panelJam.add(timeLable); 
     panelJam.add(dateLable); 
//  panelJam.add(dayLable); 
     contentPane.add(panelJam); 

     jCheckBoxMenuItem1.setText("Run Gammu"); 
     jCheckBoxMenuItem1.setSelected(false); 
     jCheckBoxMenuItem1.addItemListener(new ItemListener() { 
      @Override 
      public void itemStateChanged(ItemEvent e) { 
       System.out.println("Checked? " + jCheckBoxMenuItem1.isSelected()); 
       int state = e.getStateChange(); 
       if (state == ItemEvent.SELECTED){ 
        try { 
         scan(); 

        } catch (SQLException ex) { 
         Logger.getLogger(FormPAI.class.getName()).log(Level.SEVERE, null, ex); 
        } 
       }else{ 
        timer.cancel(); 
       } 
      } 
     }); 
    } 

    public void scan() throws SQLException{ 

     java.util.TimerTask task = new java.util.TimerTask() { 
      DebitKebutuhan dk = new DebitKebutuhan(); 
      @Override 
      public void run(){ 
       System.out.println("ajik"); 
       DataMasuk obj = new DataMasuk(); 
       DataKirim dkrm = new DataKirim(); 
       CurahHujan ch = new CurahHujan(); 
       String cek = null, processed=""; 

       try { 
        Connection c = KoneksiDatabase2.getKoneksiDBSMS(); 
        ResultSet rset = c.prepareStatement("SELECT * FROM inbox WHERE Processed='false'").executeQuery(); 
        while (rset.next()){ 
         cek = rset.getString("ID"); 
         processed = rset.getString("Processed"); 
        } 
        if (cek != null){ 
         obj.ambilTeksPesan(); 
         obj.cekFormatPesan(); 
         if (obj.formatSMS == true && processed.equals("false")){ 
          obj.ambilDataPesan(); 
          obj.simpanPesan_ke_DB(); 
          obj.sendToDataMasuk(); 
          obj.updateDataMasuk(); 
          ch.simpanCHKeDB(); 
          dkrm.sendToOutbox(); 
          obj.tandaiSudahDibalas(cek); 
         } 
        } 
        rset.close(); 
       } catch (Exception e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
      } 

     }; 
     timer = new Timer(true);// true to run timer as daemon thread 
     timer.schedule(task, 0, 5000);// Run task every 5 second 
     try { 
      Thread.sleep(60000*60); // Cancel task after 1 minute. 
     } catch (InterruptedException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     timer.cancel(); 
    } 

    public static BufferedImage resize(BufferedImage img, int newW, int newH) { 
     Image tmp = img.getScaledInstance(newW, newH, Image.SCALE_SMOOTH); 
     BufferedImage dimg = new BufferedImage(newW, newH, BufferedImage.TYPE_INT_ARGB); 

     Graphics2D g2d = dimg.createGraphics(); 
     g2d.drawImage(tmp, 0, 0, null); 
     g2d.dispose(); 

     return dimg; 
    } 


    public final void btnClose(){ 
     ImageIcon idt = new ImageIcon("C:\\Users\\X201\\Documents\\NetBeansProjects\\PembagianAirIrigasi\\src\\img\\exit.png"); 
     Image imgRoll = idt.getImage(); 
     Image newImgRoll = imgRoll.getScaledInstance(65, 65, 100); 
     ImageIcon icon = new ImageIcon("C:\\Users\\X201\\Documents\\NetBeansProjects\\PembagianAirIrigasi\\src\\img\\shutdown.png"); 
     Image img = icon.getImage(); 
     Image newimg = img.getScaledInstance(65, 65, 100); 
     btn6 = new ClButtonTransparan("<html><center>"+"KELUAR"+"</center></html>"); 
     btn6.setFont(new Font("Berlin Sans FB Demi", Font.PLAIN,12)); 
     btn6.setBounds(555, 5, 105, 105); // posisi jbutton (x, y) dan ukurunnnya (lebar, tinggi) 
     btn6.setIcon(new ImageIcon(newimg)); 
     btn6.setRolloverIcon(new ImageIcon (newImgRoll)); 
     btn6.setVerticalTextPosition(SwingConstants.BOTTOM); //membuat text jbutton berada dibawah 
     btn6.setHorizontalTextPosition(SwingConstants.CENTER); //membuat text jbutton berada ditengah 
    contentPane.add(btn6); 
     btn6.addActionListener(new ActionListener() { 
      @Override 
      public void actionPerformed(ActionEvent e) { 
       //JOptionPane.showConfirmDialog(rootPane, menuBar); 
       System.exit(0); 
      } 
     }); 
    } 




    /** 
    * This method is called from within the constructor to initialize the form. 
    * WARNING: Do NOT modify this code. The content of this method is always 
    * regenerated by the Form Editor. 
    */ 
    @SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code">       
    private void initComponents() { 

     jMenuBar1 = new javax.swing.JMenuBar(); 
     jMenu1 = new javax.swing.JMenu(); 
     jMenu2 = new javax.swing.JMenu(); 
     jCheckBoxMenuItem1 = new javax.swing.JCheckBoxMenuItem(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

     jMenu1.setText("File"); 
     jMenuBar1.add(jMenu1); 

     jMenu2.setText("Edit"); 

     jCheckBoxMenuItem1.setSelected(true); 
     jCheckBoxMenuItem1.setText("jCheckBoxMenuItem1"); 
     jCheckBoxMenuItem1.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       jCheckBoxMenuItem1ActionPerformed(evt); 
      } 
     }); 
     jMenu2.add(jCheckBoxMenuItem1); 

     jMenuBar1.add(jMenu2); 

     setJMenuBar(jMenuBar1); 

     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGap(0, 400, Short.MAX_VALUE) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGap(0, 279, Short.MAX_VALUE) 
     ); 

     pack(); 
    }// </editor-fold>       

    private void jCheckBoxMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {             

    }             

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String args[]) { 
     /* Set the Nimbus look and feel */ 
     //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> 
     /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. 
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */ 
     try { 
      for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { 
       if ("Nimbus".equals(info.getName())) { 
        javax.swing.UIManager.setLookAndFeel(info.getClassName()); 
        break; 
       } 
      } 
     } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) { 
      java.util.logging.Logger.getLogger(FormPAI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } 
     //</editor-fold> 

     /* Create and display the form */ 
     java.awt.EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try{ 
        FormPAI frame = new FormPAI(); 
        frame.setVisible(true); 
        //frame.scan(); 
       }catch(Exception e){ 
       } 
      } 
     }); 
    } 
    // Variables declaration - do not modify      
    private javax.swing.JCheckBoxMenuItem jCheckBoxMenuItem1; 
    private javax.swing.JMenu jMenu1; 
    private javax.swing.JMenu jMenu2; 
    private javax.swing.JMenuBar jMenuBar1; 
    // End of variables declaration     
} 
class ClockLabel extends JLabel implements ActionListener { 

    String type; 
    SimpleDateFormat sdf; 

    public ClockLabel(String type) { 
    this.type = type; 
    setForeground(Color.green); 

    switch (type) { 
     case "day" : sdf = new SimpleDateFormat("EEEE "); 
        setFont(new Font("Digital-7", Font.PLAIN, 14)); 
        setHorizontalAlignment(SwingConstants.RIGHT); 
        break; 
     case "time" : sdf = new SimpleDateFormat("hh:mm a"); 
        setFont(new Font("sans-serif", Font.PLAIN, 16)); 
        setHorizontalAlignment(SwingConstants.CENTER); 
        break; 
     case "date" : sdf = new SimpleDateFormat("dd MMMM yyyy"); 
        setFont(new Font("sans-serif", Font.PLAIN, 20)); 
        setHorizontalAlignment(SwingConstants.CENTER); 
        break; 
     default  : sdf = new SimpleDateFormat(); 
        break; 
    } 

    javax.swing.Timer t = new javax.swing.Timer(1000, this); 
    t.start(); 
    } 

    @Override 
    public void actionPerformed(ActionEvent ae) { 
    Date d = new Date(); 
    setText(sdf.format(d)); 
    } 
} 

Answer 1

的问题是，你把UI线程睡眠，它看起来像你睡觉的时间比你以为你是... 60000 * 60 =1小时！

public void scan() throws SQLException{ 

    java.util.TimerTask task = new java.util.TimerTask() { 
     // ... 
    }; 

    timer = new Timer(true);// true to run timer as daemon thread 
    timer.schedule(task, 0, 5000);// Run task every 5 second 
    try { 
     //-------------------------------------------------- 
     // This is putting the UI to sleep for an hour! 
     //-------------------------------------------------- 
     Thread.sleep(60000*60); // Cancel task after 1 minute. <-- NOT 1 minute! 
    } catch (InterruptedException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
    timer.cancel(); 
} 

您应该尝试将所有业务都转到单独的线程上。它可以做这样的：

public void scan() throws SQLException{ 

    Runnable scanRunner = new Runnable() { 
     public void run() { 
      java.util.TimerTask task = new java.util.TimerTask() { 
       // ... 
      }; 

      timer = new Timer(true);// true to run timer as daemon thread 
      timer.schedule(task, 0, 5000);// Run task every 5 second 
      try { 
       Thread.sleep(1000*60); // Cancel task after 1 minute. 
      } catch (InterruptedException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      timer.cancel(); 
     } 
    }; 

    new Thread(scanRunner).start(); 
} 

作为一个侧面说明，也有可能做这种方式，因为你可以检查/取消UI中的盒子在您的休闲了很多其他的问题，它不会停止任何先前的扫描任务...我会让你自己管理这种情况，或者提出一个不同的问题。