Question

enter image description here

如何在加载帧时显示日期选择器？

如何验证文本字段，用户只能输入日期格式和
如何在摇摆中将焦点放在jdatechooser图标上。

码

private void jDateChooser2FocusGained(java.awt.event.FocusEvent evt) {
    // TODO add your handling code here:
        //JDateChooser2 jdc = new JDateChooser2("DD/MM/YYYY", true);
    //jDateChooser2.getDateEditor().getUiComponent().requestFocusInWindow();
  jDateChooser2.requestFocusInWindow();

}

源代码

public class welcome extends javax.swing.JFrame {

    public static final String DATE_FORMAT_NOW = "dd/MMM/YYYY ";
    Calendar cal = Calendar.getInstance();
    SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_NOW);
    Date date = new Date();



    /**
     * Creates new form welcome
     */
    public welcome() {
        initComponents();



         sdf.setLenient(false);

         String dt = sdf.format(cal.getTime());
         System.out.println(dt);


            try  
            {  
                date = sdf.parse(dt); 
                 System.out.println(date);
            }  
            catch(ParseException pe)  
            {  
                System.out.println("pe: " + pe.getMessage());  
                Toolkit.getDefaultToolkit().beep();  
            }  
            jLabel3.setText(dt);
            jTextField1.setText(dt);
     }

private void jTextField1KeyPressed(java.awt.event.KeyEvent evt) {                                       
        // TODO add your handling code here:
   //   System.out.println("guihgio");
      if (evt.getKeyCode() == KeyEvent.VK_ENTER) {

            System.out.println("enter press key");


              this code is not working//

      char c = evt.getKeyChar();
      if (!((c >= '0') && (c <= '9') ||
         (c == KeyEvent.VK_BACK_SPACE) ||
         (c == KeyEvent.VK_DELETE) || (c == KeyEvent.VK_SLASH)))        
      {

           JOptionPane.showMessageDialog(null, "Please Enter Valid");
           evt.consume();
      }
  }

MY EVENT CODE private void jSpinner1KeyPressed（java.awt.event.KeyEvent evt）{
// TODO在这里添加您的处理代码：的System.out.println（＆＃34; spiinejngyjgkur＆＃34）;

     if (evt.getKeyCode() == KeyEvent.VK_ENTER) {
        //password pwd = new password();
        //pwd.setVisible(true);










     jSpinner1.requestFocus();

       if (evt.getSource() == jSpinner1) //add
    {
        try {
            String host = "jdbc:mysql://localhost:3306/indospirit";
            String uName = "root";
            String uPass = "paras123";

            //Class.forName("com.mysql.jdbc.Driver").newInstance();
            java.sql.Driver d = new com.mysql.jdbc.Driver();

            Connection con = DriverManager.getConnection(host, uName, uPass);

            PreparedStatement ps;
                System.out.println("weww");

      ps = con.prepareStatement("INSERT INTO `log1`(`date`)VALUES('" + dateString + "')");

            int i = ps.executeUpdate();

            if (i > 0) {
                JOptionPane.showMessageDialog(null, "Record Added");
            } else {
                JOptionPane.showMessageDialog(null, "Record NOT Added");
            }
        } catch (SQLException ex) {
            //ex.printStackTrace();
            System.err.println(ex.toString());
        } catch (Exception ex1) {
            //ex1.printStackTrace();
            System.err.println(ex1.toString());
        }
    }

    try {
        String host = "jdbc:mysql://localhost:3306/indospirit";
        String uName = "root";
        String uPass = "paras123";

        //Class.forName("com.mysql.jdbc.Driver").newInstance();
        java.sql.Driver d = new com.mysql.jdbc.Driver();

        Connection con = DriverManager.getConnection(host, uName, uPass);
        Statement stmt = con.createStatement();
        ResultSet rs = stmt.executeQuery("SELECT * from `log1` ORDER BY `date` DESC limit 1");

        while (rs.next()) {

            int col = rs.getInt("id");
            String str = rs.getString("date");

            jLabel10.setText(str);

            System.out.println(col + " " + str + " ");

        }

    } catch (SQLException ex) {
        System.err.println(ex.toString());
    } catch (Exception ex1) {
        System.err.println(ex1.toString());
    }

         } 


        event not working

private void jSpinner1StateChanged（javax.swing.event.ChangeEvent evt）{
// TODO在这里添加您的处理代码：的System.out.println（＆＃34; gijjhbip＆＃34）; System.out.println（＆＃34;来源：＆＃34; + evt.getSource（））; }

     how could  I check THAT date Enterd by user in date format in JFormattedTextField...please help  IN KEY PRESSED EVENT

       my code is here

private void jFormattedTextField1KeyPressed（java.awt.event.KeyEvent evt）{
// TODO在这里添加您的处理代码：

    System.out.println(evt.getKeyChar());

   if (evt.getKeyCode() == KeyEvent.VK_ENTER) {

       Date date = (Date) evt.getSource();
      if(!(date.equals(format)))
      {
          evt.consume();
      }
   }

Answer 1

“如何验证文本字段，用户只能输入日期格式和”

恕我直言，获取日期的用户输入是个坏主意。验证输入将变得令人头疼并且对于程序来说效率低，因为用户可以输入任何字符组合。相反，您可以使用JSpinner

来DateListModel

请参阅Spinner tutorial | SpinnerDateModel javadoc

但话又说回来，为什么甚至允许今天的日期输入？除了从用户那里获得输入之外，可以通过多种方式检索该数据。

如果你真的坚持按照自己的方式进行操作，输入文本字段并想要验证，你总是可以抓住ParseException。但在这种情况下，您需要向用户指定需要输入的确切格式，并在用户输入格式不正确或不是真实日期时提供某种通知。

SimpleDateFormat formatter = new SimplDateFormat(DATE_FORMAT_NOW);
String dateString = textField.getText();
Date date;
try {
    date = formatter.parse(dateString);
} catch (ParseException) {
    statusLabel.setText("Please enter a valid date");
    // or JOptionPane.showMessageDialog(null, "Please Enter a valid Date");
}

但问题是用户可以输入一个随机日期，例如2102中的某个日期。所以我建议使用JSpinner或不可编辑的文本字段，只显示今天的日期。

更新试试这个

import java.util.Date; import java.text.SimpleDateFormat; import javax.swing。*;

public class SpinnerDateTest {

    public static void main(String[] args) {
        Date date = new Date();
        JSpinner spinner = new JSpinner();
        SimpleDateFormat formatter = new SimpleDateFormat("dd/MMM//yyyy");
        String dateString = formatter.format(date);
        spinner.setModel(new SpinnerListModel(new String[]{dateString}));
        JOptionPane.showConfirmDialog(null, spinner, "Spinner:"
                ,JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);

    }
}

或使用SpinnerDateModel

public static void main(String[] args) {
    Date date = new Date();
    JSpinner spinner = new JSpinner();
    spinner.setModel(new SpinnerDateModel(date, null, null, Calendar.DAY_OF_WEEK));
    JOptionPane.showConfirmDialog(null, spinner, "Spinner:"
            ,JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);

}

Answer 2

我不知道您使用的是哪个库，但为什么不试试这个jcalendar。

第一个问题：你可以使用JForxtField，JTextField的instand。



    DateFormat format = new SimpleDateFormat("dd/MM/yyyy");
    DateFormatter formatter = new DateFormatter(format);  
    format.setLenient(false);  
    formatter.setAllowsInvalid(false);  
    formatter.setOverwriteMode(true);  
    JFormattedTextField formattedTextField = new JFormattedTextField(formatter);
    formattedTextField.setValue(new Date());
    formattedTextField.addKeyListener(new KeyAdapter() {

        @Override
        public void keyPressed(KeyEvent evt) {
            //System.out.println(evt.getKeyChar());
            //TODO
        }
    });

第二个问题： getFocuse的唯一方法是更改JDateChoose的源代码; 因为源代码是



    protected JButton calendarButton;
    ...
    calendarButton = new JButton(icon) {

        public boolean isFocusable() {
            return false;
        }
    };

Answer 3

您可以将其用于焦点

jDateChooser.getDateEditor().getUiComponent().requestFocusInWindow();

如果你想控制一些事件

jDateChooser.getDateEditor().getUiComponent().addKeyListener(new listenerClass());

如何在Swing中加载帧时将注意力设置在JDateChooser上？

3 个答案: