最近项目中需要一个用java编写的日历，从网上找到了一个叫做DateChooseJButton的小例子，但是这个例子没有精确到分和秒的功能，我自己对它
进行了改进，实现了对分和秒的计时。现在把代码贴在下面。
package dateapp;
import java.util.Date;
import java.util.Calendar;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.text.ParseException ;
import java.awt.Color ;
import java.awt.Font;
import java.awt.Point ;
import java.awt.Dimension ;
import java.awt.BorderLayout ;
import java.awt.FlowLayout ;
import java.awt.GridLayout ;
import java.awt.Component ;
import java.awt.Cursor ;
import java.awt.Frame ;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
//import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JSpinner ;
import javax.swing.JSpinner.NumberEditor ;
import javax.swing.SpinnerNumberModel;
import javax.swing.SwingUtilities;
import javax.swing.SwingConstants ;
import javax.swing.event.ChangeListener ;
import javax.swing.event.ChangeEvent ;
import javax.swing.border.LineBorder ;
public class DateChooseJButton extends JButton 
{
private DateChooser dateChooser =null;
private String preLabel ="" ;
public DateChooseJButton() {
this(getNowDate()) ;
}
public DateChooseJButton(SimpleDateFormat df , String dateString) {
this() ;
setText(df,dateString) ;
}
public DateChooseJButton(Date date) {
this("",date);
}
public DateChooseJButton(String preLabel , Date date) {
if (preLabel!=null) this.preLabel = preLabel ;
setDate(date) ;
setBorder(null) ;
setCursor(new Cursor(Cursor.HAND_CURSOR)) ;
super.addActionListener( new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (dateChooser==null) dateChooser = new DateChooser();
Point p = getLocationOnScreen() ;
p.y = p.y+30 ;
dateChooser.showDateChooser(p) ;
}
}) ;
}
private static Date getNowDate() {
return Calendar.getInstance().getTime() ;
}
private static SimpleDateFormat getDefaultDateFormat() {
return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss") ;
}
//覆盖父类的方法
public void setText(String s) {
Date date ;
try {
date = getDefaultDateFormat().parse(s) ;
}catch (ParseException e) {
date = getNowDate() ;
}
setDate(date) ;
}
public void setText(SimpleDateFormat df , String s) {
Date date ;
try {
date = df.parse(s) ;
}catch (ParseException e) {
date = getNowDate() ;
}
setDate(date) ;
}
public void setDate(Date date) {
super.setText(preLabel+getDefaultDateFormat().format(date));
}
public Date getDate() {
String dateString = getText().substring(preLabel.length());
try {
return getDefaultDateFormat().parse(dateString);
} catch (ParseException e) {
return getNowDate() ;
}
}
//覆盖父类的方法使之无效
public void addActionListener(ActionListener listener ) {
}
private class DateChooser extends JPanel implements ActionListener ,ChangeListener {
int startYear = 1980; //默认【最小】显示年份
int lastYear = 2050; //默认【最大】显示年份
int width = 400; //界面宽度
int height = 200; //界面高度
Color backGroundColor = Color.gray; //底色
//月历表格配色----------------//
Color palletTableColor = Color.white; //日历表底色
Color todayBackColor = Color.orange; //今天背景色
Color weekFontColor = Color.blue; //星期文字色
Color dateFontColor = Color.black; //日期文字色
Color weekendFontColor = Color.red; //周末文字色
//控制条配色------------------//
Color controlLineColor = Color.pink; //控制条底色
Color controlTextColor = Color.white; //控制条标签文字色
Color rbFontColor = Color.white; //RoundBox文字色
Color rbBorderColor = Color.red; //RoundBox边框色
Color rbButtonColor = Color.pink; //RoundBox按钮色
Color rbBtFontColor = Color.red; //RoundBox按钮文字色
JDialog dialog ;
JSpinner yearSpin ;
JSpinner monthSpin ;
JSpinner hourSpin ;
JComboBox minSpin ;
JComboBox secondBox ;
JButton[][] daysButton = new JButton[6][7] ;
DateChooser() {
setLayout(new BorderLayout());
setBorder(new LineBorder(backGroundColor, 2));
setBackground(backGroundColor);
JPanel topYearAndMonth = createYearAndMonthPanal();
add(topYearAndMonth,BorderLayout.NORTH);
JPanel centerWeekAndDay = createWeekAndDayPanal();
add(centerWeekAndDay,BorderLayout.CENTER);
}
private JPanel createYearAndMonthPanal(){
Calendar c = getCalendar() ;
int currentYear =c.get(Calendar.YEAR);
int currentMonth =c.get(Calendar.MONTH)+1;
int currentHour =c.get(Calendar.HOUR_OF_DAY);
int currentMin = c.get(Calendar.MINUTE) ;
int currentSecond = c.get(Calendar.SECOND) ;
JPanel result = new JPanel();
result.setLayout(new FlowLayout());
result.setBackground(controlLineColor);
yearSpin = new JSpinner(new SpinnerNumberModel(currentYear,startYear,lastYear,1));
yearSpin.setPreferredSize(new Dimension(48,20)) ;
yearSpin.setName("Year") ;
yearSpin.setEditor(new JSpinner.NumberEditor(yearSpin, "####")) ;
yearSpin.addChangeListener(this) ;
result.add(yearSpin) ;
JLabel yearLabel = new JLabel("年");
yearLabel.setForeground(controlTextColor);
result.add(yearLabel);
monthSpin = new JSpinner(new SpinnerNumberModel(currentMonth,1,12,1));
monthSpin.setPreferredSize(new Dimension(35,20)) ;
monthSpin.setName("Month") ;
monthSpin.addChangeListener(this) ;
result.add(monthSpin) ;
JLabel monthLabel = new JLabel("月");
monthLabel.setForeground(controlTextColor);
result.add(monthLabel);
hourSpin = new JSpinner(new SpinnerNumberModel(currentHour,0,23,1));
hourSpin.setPreferredSize(new Dimension(35,20)) ;
hourSpin.setName("Hour") ;
hourSpin.addChangeListener(this) ;
result.add(hourSpin) ;
JLabel hourLabel = new JLabel("时");
hourLabel.setForeground(controlTextColor);
result.add(hourLabel);
minSpin = new JComboBox();;
addComboBoxItem(minSpin) ;
minSpin.setPreferredSize(new Dimension(45,20)) ;
minSpin.setName("Min") ;
minSpin.addItemListener(new java.awt.event.ItemListener() {
public void itemStateChanged(java.awt.event.ItemEvent e) {
JComboBox source =(JComboBox)e.getSource() ;
Calendar c = getCalendar() ;
if (source.getName().equals("Min")) {
c.set(Calendar.MINUTE, getSelectedMin());
setDate(c.getTime());
return ;
}
}
});
result.add(minSpin) ;
JLabel minLabel = new JLabel("分");
hourLabel.setForeground(controlTextColor);
result.add(minLabel);
secondBox = new JComboBox();
addComboBoxItem(secondBox) ;
secondBox.setPreferredSize(new Dimension(45,20)) ;
secondBox.setName("Second") ;
//secondBox.addActionListener(this) ;
secondBox.addItemListener(new java.awt.event.ItemListener() {
public void itemStateChanged(java.awt.event.ItemEvent e) {
JComboBox source =(JComboBox)e.getSource() ;
Calendar c = getCalendar() ;
if (source.getName().equals("Second")) {
c.set(Calendar.SECOND, getSelectedSecond());
setDate(c.getTime());
return ;
}
}
});
result.add(secondBox) ;
JLabel secondLabel = new JLabel("秒");
hourLabel.setForeground(controlTextColor);
result.add(secondLabel);
return result ;
}
private void addComboBoxItem(JComboBox comboBox)
{
for(int i = 0 ; i < 60 ; i++)
{
comboBox.addItem(i);
}
}
private JPanel createWeekAndDayPanal() {
String colname[] = {"日","一","二","三","四","五","六"};
JPanel result = new JPanel();
//设置固定字体，以免调用环境改变影响界面美观
result.setFont(new Font("宋体", Font.PLAIN, 12));
result.setLayout(new GridLayout(7,7));
result.setBackground(Color.white);
JLabel cell ;
for(int i=0;i<7;i++) {
cell = new JLabel(colname[i]);
cell.setHorizontalAlignment(JLabel.RIGHT);
if (i==0 || i==6) cell.setForeground(weekendFontColor) ;
else cell.setForeground(weekFontColor) ;
result.add(cell) ;
}
int actionCommandId = 0 ;
for(int i = 0; i < 6; i++)
for(int j = 0; j < 7; j++) {
JButton numberButton = new JButton();
numberButton.setBorder(null) ;
numberButton.setHorizontalAlignment(SwingConstants.RIGHT);
numberButton.setActionCommand(String.valueOf(actionCommandId)) ;
numberButton.addActionListener(this) ;
numberButton.setBackground(palletTableColor);
numberButton.setForeground(dateFontColor) ;
if (j==0 || j==6) numberButton.setForeground(weekendFontColor) ;
else numberButton.setForeground(dateFontColor) ;
daysButton[i][j] = numberButton;
result.add(numberButton) ;
actionCommandId ++ ;
}
return result;
}
private JDialog createDialog(Frame owner ) {
JDialog result = new JDialog(owner,"日期时间选择",true) ;
result.setDefaultCloseOperation(JDialog.HIDE_ON_CLOSE);
result.getContentPane().add(this,BorderLayout.CENTER) ;
result.pack() ;
result.setSize(width, height);
return result ;
}
void showDateChooser(Point position ) {
Frame owner =(Frame)SwingUtilities.getWindowAncestor(DateChooseJButton.this) ;
if (dialog==null || dialog.getOwner()!= owner) dialog = createDialog(owner ) ;
dialog.setLocation(getAppropriateLocation(owner ,position ) ) ;
flushWeekAndDay() ;
dialog.show();
}
Point getAppropriateLocation(Frame owner ,Point position ) {
Point result = new Point(position) ;
Point p = owner.getLocation() ;
int offsetX = (position.x+width) - (p.x + owner.getWidth() ) ;
int offsetY = (position.y+height) - (p.y + owner.getHeight() ) ;
if (offsetX >0 ) {
result.x -= offsetX ;
}
if (offsetY >0 ) {
result.y -= offsetY ;
}
return result ;
}
private Calendar getCalendar() {
Calendar result = Calendar.getInstance();
result.setTime(getDate()) ;
return result ;
}
private int getSelectedYear() {
return ((Integer)yearSpin.getValue()).intValue() ;
}
private int getSelectedMonth() {
return ((Integer)monthSpin.getValue()).intValue() ;
}
private int getSelectedHour() {
return ((Integer)hourSpin.getValue()).intValue() ;
}
private int getSelectedMin() {
return (Integer)this.minSpin.getSelectedItem() ;
}
private int getSelectedSecond() {
return (Integer)this.secondBox.getSelectedItem() ;
}
private void dayColorUpdate(boolean isOldDay) {
Calendar c = getCalendar() ;
int day = c.get(Calendar.DAY_OF_MONTH);
c.set(Calendar.DAY_OF_MONTH,1);
int actionCommandId =day-2+c.get(Calendar.DAY_OF_WEEK) ;
int i = actionCommandId/7;
int j = actionCommandId%7;
if (isOldDay) daysButton[i][j].setForeground(dateFontColor) ;
else daysButton[i][j].setForeground(todayBackColor) ;
}
private void flushWeekAndDay() {
Calendar c = getCalendar() ;
c.set(Calendar.DAY_OF_MONTH,1);
int maxDayNo = c.getActualMaximum(Calendar.DAY_OF_MONTH);
int dayNo = 2 - c.get(Calendar.DAY_OF_WEEK) ;
for(int i = 0; i < 6; i++) {
for(int j = 0; j < 7; j++) {
String s="" ;
if (dayNo>=1 && dayNo<=maxDayNo ) s = String.valueOf(dayNo) ;
daysButton[i][j].setText(s) ;
dayNo ++ ;
}
}
dayColorUpdate(false) ;
}
public void stateChanged(ChangeEvent e) {
JSpinner source =(JSpinner)e.getSource() ;
Calendar c = getCalendar() ;
if (source.getName().equals("Hour")) {
c.set(Calendar.HOUR_OF_DAY, getSelectedHour());
setDate(c.getTime());
return ;
}
dayColorUpdate(true) ;
if (source.getName().equals("Year"))
c.set(Calendar.YEAR, getSelectedYear());
else
// (source.getName().equals("Month"))
c.set(Calendar.MONTH, getSelectedMonth()-1);
setDate(c.getTime());
flushWeekAndDay() ;
}
public void actionPerformed(ActionEvent e) {
JButton source =(JButton)e.getSource() ;
if (source.getText().length()==0) return ;
dayColorUpdate(true) ;
source.setForeground(todayBackColor) ;
int newDay = Integer.parseInt(source.getText());
Calendar c = getCalendar() ;
c.set(Calendar.DAY_OF_MONTH,newDay);
setDate(c.getTime());
}
}
}
上述日期控件继承JButton，使用时只要构造出来JButton对象就行了。