加载框架时如何在日期选择器上显示焦点？
- 如何验证用户只能输入日期格式的文本字段以及
- 如何将焦点设置在 swing 中的 jdatechooser 图标上。
代码
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();
}
}
我的事件代码 private void jSpinner1KeyPressed(java.awt.event.KeyEvent evt) {
//TODO 在此处添加您的处理代码:
System.out.println("spiinejngyjgkur");
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 在此处添加您的处理代码:
System.out.println("gijjhbip");
System.out.println("来源:"+ 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 在此处添加您的处理代码:
System.out.println(evt.getKeyChar());
if (evt.getKeyCode() == KeyEvent.VK_ENTER) {
Date date = (Date) evt.getSource();
if(!(date.equals(format)))
{
evt.consume();
}
}
最佳答案
"how could verify textfield that user can enter only date format and "
恕我直言，获取用户输入的日期是一个很糟糕的主意。验证输入将变得令人头疼并且对于程序来说效率低下，因为用户可以输入任何字符组合。相反，您可以使用 JSpinner 和 DateListModel
参见Spinner tutorial | SpinnerDateModel javadoc
<小时/>但是话又说回来，为什么还要允许输入今天的日期呢？除了从用户那里获取输入之外，还可以通过多种方式检索该数据。
<小时/>如果您确实坚持按照自己的方式进行文本字段输入并希望进行验证，则始终可以捕获ParseException。但在这种情况下，您需要向用户准确指定需要输入的格式，并在用户输入的格式不正确或不是真实日期时发出某种通知。
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");
}
但又一个问题是用户可以输入随机日期，例如 2102 年的某个日期。因此我建议使用 JSpinner 或仅显示今天日期的不可编辑文本字段。
更新试试这个
导入java.util.Date; 导入 java.text.SimpleDateFormat; 导入 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);
}
}
或者使用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);
}
关于java - 在 Swing 中加载框架时如何将焦点设置在 JDateChooser 上？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20945380/