在我的Swing仪表板中，我正在使用日期选择器。它不打印所选日期，而是打印默认日期 - yyyy-mm-dd（即程序继续从上到下执行，无需等待日期选择）。
这是我的代码
package com.example.test;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
public class Dashboard extends JFrame {
private static final long serialVersionUID = 9028454994792295975L;
static String FROM_DATE = "0000-00-00";
static String TO_DATE = "0000-00-00";
Dashboard() {
setTitle("Dashboard");
setSize(300, 300); // width, height
setLocationRelativeTo(null);
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
placeComponents(this);
setResizable(false);
setVisible(true);
}
private static void placeComponents(JFrame frame) {
frame.setLayout(null);
JButton activeDirectoryRefreshButton = new JButton("Refresh");
activeDirectoryRefreshButton.setActionCommand("Refresh Active Directory");
activeDirectoryRefreshButton.setBounds(150, 50, 80, 25);
frame.add(activeDirectoryRefreshButton);
//Other buttons go here
activeDirectoryRefreshButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setCaadDateInfo();
System.out.println("This should print only after date selection");
System.out.println("From Date : " + FROM_DATE);
System.out.println("To Date : " + TO_DATE);
}
});
}
public static void setCaadDateInfo() {
JLabel fromLabel = new JLabel("From Date:", SwingConstants.CENTER);
final JTextField fromDate = new JTextField(12);
JButton fromButton = new JButton("Pick Date");
JLabel toLabel = new JLabel("To Date:", SwingConstants.CENTER);
final JTextField toDate = new JTextField(12);
JButton toButton = new JButton("Pick Date");
JLabel dummyLabel1 = new JLabel("");
JButton okButton = new JButton("Ok");
JLabel dummyLabel2 = new JLabel("");
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(3,3));
panel.add(fromLabel);
panel.add(fromDate);
panel.add(fromButton);
panel.add(toLabel);
panel.add(toDate);
panel.add(toButton);
panel.add(dummyLabel1);
panel.add(okButton);
panel.add(dummyLabel2);
final JFrame jframe = new JFrame("AD Date Selector");
jframe.getContentPane().add(panel);
jframe.setLocationRelativeTo(jframe);
jframe.pack();
jframe.setVisible(true);
// final JDialog jdialog = new JDialog(jframe, "AD Date Selector");
// jdialog.setModal(true);
// jdialog.getContentPane().add(panel);
// jdialog.setLocationRelativeTo(null);
// jdialog.pack();
// jdialog.setVisible(true);
fromButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
FROM_DATE = new DatePickerUtil(jframe).setPickedDate();
fromDate.setText(FROM_DATE);
}
});
toButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
TO_DATE = new DatePickerUtil(jframe).setPickedDate();
toDate.setText(TO_DATE);
}
});
okButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
System.out.println("Ok button clicked");
jframe.setVisible(false);
}
});
}
public static void main(String[] args) {
new Dashboard();
}
}
以下是我从
中挑选的Date Picker code以下是代码：
package com.example.test;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/*
* Code taken from : https://www.roseindia.net/tutorial/java/swing/datePicker.html
*/
public class DatePickerUtil {
int month = java.util.Calendar.getInstance().get(java.util.Calendar.MONTH);
int year = java.util.Calendar.getInstance().get(java.util.Calendar.YEAR);;
JLabel l = new JLabel("", JLabel.CENTER);
String day = "";
JDialog d;
JButton[] button = new JButton[49];
public DatePickerUtil(JFrame parent) {
d = new JDialog();
d.setModal(true);
String[] header = { "Sun", "Mon", "Tue", "Wed", "Thur", "Fri", "Sat" };
JPanel p1 = new JPanel(new GridLayout(7, 7));
p1.setPreferredSize(new Dimension(430, 120));
for (int x = 0; x < button.length; x++) {
final int selection = x;
button[x] = new JButton();
button[x].setFocusPainted(false);
button[x].setBackground(Color.white);
if (x > 6)
button[x].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
day = button[selection].getActionCommand();
d.dispose();
}
});
if (x < 7) {
button[x].setText(header[x]);
button[x].setForeground(Color.red);
}
p1.add(button[x]);
}
JPanel p2 = new JPanel(new GridLayout(1, 3));
JButton previous = new JButton("<< Previous");
previous.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
month--;
displayDate();
}
});
p2.add(previous);
p2.add(l);
JButton next = new JButton("Next >>");
next.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
month++;
displayDate();
}
});
p2.add(next);
d.add(p1, BorderLayout.CENTER);
d.add(p2, BorderLayout.SOUTH);
d.pack();
d.setLocationRelativeTo(parent);
displayDate();
d.setVisible(true);
}
public void displayDate() {
for (int x = 7; x < button.length; x++)
button[x].setText("");
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("MMMM yyyy");
java.util.Calendar cal = java.util.Calendar.getInstance();
cal.set(year, month, 1);
int dayOfWeek = cal.get(java.util.Calendar.DAY_OF_WEEK);
int daysInMonth = cal.getActualMaximum(java.util.Calendar.DAY_OF_MONTH);
for (int x = 6 + dayOfWeek, day = 1; day <= daysInMonth; x++, day++)
button[x].setText("" + day);
l.setText(sdf.format(cal.getTime()));
d.setTitle("Date Picker");
}
public String setPickedDate() {
if (day.equals(""))
return day;
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd");
java.util.Calendar cal = java.util.Calendar.getInstance();
cal.set(year, month, Integer.parseInt(day));
return sdf.format(cal.getTime());
}
}
输出
这应该仅在日期选择之后打印
From Date : 0000-00-00
To Date : 0000-00-00
请帮忙。
答案 0 :(得分：0)
因此，在花了一些时间对付代码后，您的基本问题归结为当您应该使用模式JFrame时使用JDialog - 有关详情，请参阅How to Make Dialogs
你在这里有正确的想法......
final JFrame jframe = new JFrame("AD Date Selector");
jframe.getContentPane().add(panel);
jframe.setLocationRelativeTo(jframe);
jframe.pack();
jframe.setVisible(true);
//final JDialog jdialog = new JDialog(jframe, "AD Date Selector");
//jdialog.setModal(true);
//jdialog.getContentPane().add(panel);
//jdialog.setLocationRelativeTo(null);
//jdialog.pack();
//jdialog.setVisible(true);
但是，在将ActionListener连接到按钮之前，您已使对话框可见，这意味着当对话框可见时，代码执行在此时停止，并等到对话框再次关闭之前继续（并添加ActionListener s）
不要依赖static，如果使用不当或过度，则表明设计不良。这不是跨对象通信的手段。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
Dashboard dashboard = new Dashboard();
}
});
}
public class Dashboard extends JFrame {
private static final long serialVersionUID = 9028454994792295975L;
JTextField fromDate;
JTextField toDate;
Dashboard() {
setTitle("Dashboard");
setSize(300, 300); // width, height
setLocationRelativeTo(null);
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
placeComponents(this);
// setResizable(false);
setVisible(true);
}
private void placeComponents(JFrame frame) {
frame.setLayout(null);
JButton activeDirectoryRefreshButton = new JButton("Refresh");
activeDirectoryRefreshButton.setActionCommand("Refresh Active Directory");
activeDirectoryRefreshButton.setBounds(150, 50, 80, 25);
frame.add(activeDirectoryRefreshButton);
//Other buttons go here
activeDirectoryRefreshButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setCaadDateInfo();
System.out.println("This should print only after date selection");
System.out.println("From Date : " + fromDate.getText());
System.out.println("To Date : " + toDate.getText());
}
});
}
public void setCaadDateInfo() {
JLabel fromLabel = new JLabel("From Date:", SwingConstants.CENTER);
fromDate = new JTextField(12);
JButton fromButton = new JButton("Pick Date");
JLabel toLabel = new JLabel("To Date:", SwingConstants.CENTER);
toDate = new JTextField(12);
JButton toButton = new JButton("Pick Date");
JLabel dummyLabel1 = new JLabel("");
JButton okButton = new JButton("Ok");
JLabel dummyLabel2 = new JLabel("");
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(3, 3));
panel.add(fromLabel);
panel.add(fromDate);
panel.add(fromButton);
panel.add(toLabel);
panel.add(toDate);
panel.add(toButton);
panel.add(dummyLabel1);
panel.add(okButton);
panel.add(dummyLabel2);
final JDialog jframe = new JDialog(this, "AD Date Selector", true);
fromButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
String value = new DatePickerUtil(fromButton).setPickedDate();
fromDate.setText(value);
}
});
toButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
String value = new DatePickerUtil(toButton).setPickedDate();
toDate.setText(value);
}
});
okButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
System.out.println("Ok button clicked");
jframe.setVisible(false);
}
});
jframe.getContentPane().add(panel);
jframe.setLocationRelativeTo(jframe);
jframe.pack();
jframe.setVisible(true);
}
}
public class DatePickerUtil {
int month = java.util.Calendar.getInstance().get(java.util.Calendar.MONTH);
int year = java.util.Calendar.getInstance().get(java.util.Calendar.YEAR);
JLabel l = new JLabel("", JLabel.CENTER);
String day = "";
JDialog d;
JButton[] button = new JButton[49];
public DatePickerUtil(Component parent) {
d = new JDialog(SwingUtilities.windowForComponent(parent));
d.setModal(true);
String[] header = {"Sun", "Mon", "Tue", "Wed", "Thur", "Fri", "Sat"};
JPanel p1 = new JPanel(new GridLayout(7, 7));
p1.setPreferredSize(new Dimension(430, 120));
for (int x = 0; x < button.length; x++) {
final int selection = x;
button[x] = new JButton();
button[x].setFocusPainted(false);
button[x].setBackground(Color.white);
if (x > 6) {
button[x].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
day = button[selection].getActionCommand();
d.dispose();
}
});
}
if (x < 7) {
button[x].setText(header[x]);
button[x].setForeground(Color.red);
}
p1.add(button[x]);
}
JPanel p2 = new JPanel(new GridLayout(1, 3));
JButton previous = new JButton("<< Previous");
previous.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
month--;
displayDate();
}
});
p2.add(previous);
p2.add(l);
JButton next = new JButton("Next >>");
next.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
month++;
displayDate();
}
});
p2.add(next);
d.add(p1, BorderLayout.CENTER);
d.add(p2, BorderLayout.SOUTH);
d.pack();
d.setLocationRelativeTo(parent);
displayDate();
d.setVisible(true);
}
public void displayDate() {
for (int x = 7; x < button.length; x++) {
button[x].setText("");
}
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("MMMM yyyy");
java.util.Calendar cal = java.util.Calendar.getInstance();
cal.set(year, month, 1);
int dayOfWeek = cal.get(java.util.Calendar.DAY_OF_WEEK);
int daysInMonth = cal.getActualMaximum(java.util.Calendar.DAY_OF_MONTH);
for (int x = 6 + dayOfWeek, day = 1; day <= daysInMonth; x++, day++) {
button[x].setText("" + day);
}
l.setText(sdf.format(cal.getTime()));
d.setTitle("Date Picker");
}
public String setPickedDate() {
if (day.equals("")) {
return day;
}
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd");
java.util.Calendar cal = java.util.Calendar.getInstance();
cal.set(year, month, Integer.parseInt(day));
return sdf.format(cal.getTime());
}
}
}
虽然这有效，但我建议您更改setCaadDateInfo方法，以返回包含日期信息的数组或其他对象。
维护日期值为String也是一个坏主意，Java有java.util.Date或者最好是java.time.LocalDate类，你应该使用它们