JAVA GUI中日期选择控件的实现

最近在做项目时在日期选择控件上花了不少时间，所以在此总结一下，引用的地方均注明了原文出处。
一、SWING版
运行效果图：

代码：

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import javax.swing.border. * ;
import javax.swing. event . * ;
import javax.swing. * ;
import java.awt. * ;
import java.awt. event . * ;
/* *
 * 日期的选择控件，可以作为普通的组件使用，在构造函数中,必须传入一个该组件的所有者对象。
 * 并且该对象只能是一个Frame对象或者一个JFrame对象。
 * 使用方法如下：
 *       JFrame frame2 = new JFrame();
 *       frame2.getContentPane().setLayout(null);
 *       DateChooser date = new DateChooser(frame2);
 *       frame2.getContentPane().add(date);
 *       frame2.setSize(500, 400);
 *       frame2.setVisible(true); 
 *组件的外观象一个combox，单击下拉按钮就可以对日期进行选择。
 * Title: 日期选择控件
 * Copyright: Copyright (c) 2006
 * Company: Xaccp
 * Date:2006年6月17日
 * @author Tellixu(许天岭)
 * @version 1.0
  */
public   class  DateChooser extends JPanel
{
    
         private   int  width  =   200 ;  // 日期控件的宽度
         private   int  height  =   220 ;  // 日期控件的高度
    
         private  GridBagLayout gridBagLayout1  =   new  GridBagLayout();
         private  JTextField dateField  =   new  JTextField();
         private  DateChooserButton btnChoose  =   new  DateChooserButton( " ▼ " );  // ▼是指：▼下拉箭头的unicode码
         private  String parten;
         private  Container owner;
         private   int  length = 120 ;
         public  DateChooser(Container owner, int  length) {
            this .owner  =  owner;
            this .parten  =   " yyyy-MM-dd " ;
            this .length = length;
            try  {
               init();
           }
            catch  (Exception ex) {
               ex.printStackTrace();
           }
       }
         /* *
         * 根据一个所有者和一个日期的显示格式构造一个DateChooser对象。
          */
         public  DateChooser(Container owner, String partten, int  length) {
             this .owner  =  owner;
             this .parten  =  partten;
             this .length = length;
             try  {
                init();
            }
             catch  (Exception ex) {
                ex.printStackTrace();
            }
        }
         /* *
         * 根据一个所有者和一个日期的显示格式构造一个DateChooser对象。
          */
         public  DateChooser(Container owner, String partten) {
             this .owner  =  owner;
             this .parten  =  partten;
             try  {
                init();
            }
             catch  (Exception ex) {
                ex.printStackTrace();
            }
    
        }
         /* *
         * 以缺省的partten构建DateChooser对象
         * 日期选择框的所有者必须是Frame或者是JFrame对象。
          */
         public  DateChooser(Container owner) {
             this .owner  =  owner;
             this .parten  =   " yyyy-MM-dd " ;
             try  {
                init();
            }
             catch  (Exception ex) {
                ex.printStackTrace();
            }
        }
    
         /* *
         * 系统初始化
         * @throws Exception
          */
         private   void  init() throws Exception {
            dateField.setToolTipText( " 单击右边的按钮即可选择日期 " );
            btnChoose.setToolTipText( " 单击即可选择日期 " );
             this .setLayout(gridBagLayout1);
            dateField.setEditable( false );
            btnChoose.addActionListener( new  ActionListener() {
                 public   void  actionPerformed(ActionEvent e) {
                    DateChooser. this .btnChoose_actionPerformed(e);
                }
            });
            Date date  =   new  Date();
            SimpleDateFormat simpleDateFormat  =   new  SimpleDateFormat(parten);
             this .setText(simpleDateFormat.format(date));
             this .add(dateField,  new  GridBagConstraints( 0 ,  0 ,  1 ,  1 ,  0.0 ,  0.0
                , GridBagConstraints.CENTER,
                GridBagConstraints.NONE,
                 new  Insets( 0 ,  0 ,  0 ,  0 ),  this .length,  0 ));
             this .add(btnChoose,  new  GridBagConstraints( 1 ,  0 ,  1 ,  1 ,  0.0 ,  0.0
                , GridBagConstraints.CENTER, GridBagConstraints.NONE,
                 new  Insets( 0 ,  0 ,  0 ,  0 ),  0 ,  0 ));
        }
         public   void  setToolTipText(String text) {
            dateField.setToolTipText(text);
            btnChoose.setToolTipText(text);
        }
         /* *
         * 下拉按钮的事件处理
         * @param e ActionEvent
          */
         public   void  btnChoose_actionPerformed(ActionEvent e) {
            java.awt.Rectangle r  =  dateField.getBounds();
            Point pOnScreen  =  dateField.getLocationOnScreen();
    
            Point result  =   new  Point(pOnScreen.x, pOnScreen.y  +  r.height);
            Point powner  =  owner.getLocation();
             int  offsetX  =  (pOnScreen.x  +  width)  -  (powner.x  +  owner.getWidth());
             int  offsetY  =  (pOnScreen.y  +  r.height  +  height)  -
                (powner.y  +  owner.getHeight());
    
             if  (offsetX  >   0 ) {
                result.x  -=  offsetX;
            }
    
             if  (offsetY  >   0 ) {
                result.y  -=  height  +  r.height;
            }
    
            javax.swing.JDialog dateFrame  =   new  javax.swing.JDialog();
            dateFrame.setModal( false );
            dateFrame.setUndecorated( true );
            dateFrame.setLocation(result);
            dateFrame.setSize(width, height);
    
            dateFrame.addWindowListener( new  WindowAdapter() {
                 // 在任意的非日期选择区单击，则日期选择组件将变为非活动状态，自动释放资源。
                 public   void  windowDeactivated(WindowEvent e) {
                    javax.swing.JDialog f  =  (javax.swing.JDialog) e.getSource();
                    f.dispose();
                }
            });
            DatePanel datePanel  =   new  DatePanel(dateFrame, parten);
            dateFrame.getContentPane().setLayout( new  BorderLayout());
            dateFrame.getContentPane().add(datePanel);
            dateFrame.setVisible( true );
        }
         /* *
         * 得到日期控件中的值
         * @return String
          */
         public  String getText() {
             return   this .dateField.getText();
        }
         /* *
         * 设置文本域的值
         * @param text String
          */
         public   void  setText(String text) {
             this .dateField.setText(text);
        }
         /* *
         * 该方法非常有用，是外部直接访问的TextField对象。
         * @return JTextField
          */
         public  JTextField getDateField() {
             return  dateField;
        }
         /* *
         * 内部类，日期选择控件的主体，封装了所有日期选择的内容，主要是一个Panel
          */
         class  DatePanel
            extends JPanel implements MouseListener,
            ChangeListener {
    
             int  startYear  =   1970 ;  // 默认【最小】显示年份
             int  lastYear  =   2050 ;  // 默认【最大】显示年份
    
            Color backGroundColor  =  Color.gray;  // 底色
     // 月历表格配色---------------- //
            Color palletTableColor  =  Color.white;  // 日历表底色
            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
            Color moveButtonColor  =  Color.BLUE;  // 鼠标移动的日历底色
            Color todayBtnColor  =  Color.pink;  // 今天的日历底色
     // 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
    
            JSpinner yearSpin;
            JSpinner monthSpin;
            JSpinner hourSpin;
            JButton[][] daysButton  =   new  JButton[ 6 ][ 7 ];
    
            javax.swing.JDialog f;
    
            JPanel dayPanel  =   new  JPanel();  // 日期panel
            JPanel yearPanel  =   new  JPanel();
    
            Calendar calendar  =  Calendar.getInstance();
            String pattern;
    
             /* *
             * 日期选择控件放在了非模态对话框中
              */
             public  DatePanel(javax.swing.JDialog target, String pattern) {
                super();
    
                 this .f  =  target;
                 this .pattern  =  pattern;
    
                setLayout( new  BorderLayout());
                setBorder( new  LineBorder(backGroundColor,  2 ));
                setBackground(backGroundColor);
                initButton();  // 初始化放置日期的按钮。
                createYearAndMonthPanal();  //
                 this .flushWeekAndDayPanal(calendar);  // 之前必须先保证放置日期的按钮已经初始化。
                 this .setLayout( new  BorderLayout());
                 this .add(yearPanel, BorderLayout.NORTH);
                 this .add(dayPanel, BorderLayout.CENTER);
            }
    
             /* *
             * 日期选择控件的按钮初始化
              */
             private   void  initButton() {
                 int  actionCommandId  =   1 ;
                 for  ( int  i  =   0 ; i  <   6 ; i ++ ) {
                     for  ( int  j  =   0 ; j  <   7 ; j ++ ) {
                        JButton numberButton  =   new  JButton();
                        numberButton.setBorder(BorderFactory.createEmptyBorder());
                        numberButton.setHorizontalAlignment(SwingConstants.CENTER);
                        numberButton.setActionCommand(String.valueOf(
                            actionCommandId));
    
                        numberButton.addMouseListener( this );
    
                        numberButton.setBackground(palletTableColor);
                        numberButton.setForeground(dateFontColor);
                        numberButton.setText(String.valueOf(actionCommandId));
                        numberButton.setPreferredSize( new  Dimension( 25 ,  25 ));
                        daysButton[i][j]  =  numberButton;
                        actionCommandId ++ ;
                    }
                }
            }
             private  Date getNowDate() {
                 return  Calendar.getInstance().getTime();
            }
             private  Calendar getNowCalendar() {
                Calendar result  =  Calendar.getInstance();
                 return  result;
            }
             private  Date getSelectDate() {
                 return  calendar.getTime();
            }
    
             /* *
             * 创建年月日的面板
              */
             private   void  createYearAndMonthPanal() {
                Calendar c  =  getNowCalendar();
                 int  currentYear  =  c. get (Calendar.YEAR);
                 int  currentMonth  =  c. get (Calendar.MONTH)  +   1 ;
                 int  currentHour  =  c. get (Calendar.HOUR_OF_DAY);
                yearSpin  =   new  JSpinner( new  javax.swing.SpinnerNumberModel(
                    currentYear,
                    startYear, lastYear,  1 ));
                monthSpin  =   new  JSpinner( new  javax.swing.SpinnerNumberModel(
                    currentMonth,  1 ,  12 ,
                     1 ));
                hourSpin  =   new  JSpinner( new  javax.swing.SpinnerNumberModel(
                    currentHour,  0 ,  23 ,
                     1 ));
    
                yearPanel.setLayout( new  java.awt.FlowLayout());
                yearPanel.setBackground(controlLineColor);
    
                yearSpin.setPreferredSize( new  Dimension( 48 ,  20 ));
                yearSpin.setName( " Year " );
                yearSpin.setEditor( new  JSpinner.NumberEditor(yearSpin,  " #### " ));
                yearSpin.addChangeListener( this );
                yearPanel.add(yearSpin);
    
                JLabel yearLabel  =   new  JLabel( " 年 " );
                yearLabel.setForeground(controlTextColor);
                yearPanel.add(yearLabel);
    
                monthSpin.setPreferredSize( new  Dimension( 35 ,  20 ));
                monthSpin.setName( " Month " );
                monthSpin.addChangeListener( this );
                yearPanel.add(monthSpin);
    
                JLabel monthLabel  =   new  JLabel( " 月 " );
                monthLabel.setForeground(controlTextColor);
                yearPanel.add(monthLabel);
    
                hourSpin.setPreferredSize( new  Dimension( 35 ,  20 ));
                hourSpin.setName( " Hour " );
                hourSpin.addChangeListener( this );
                yearPanel.add(hourSpin);
    
                JLabel hourLabel  =   new  JLabel( " 时 " );
                hourLabel.setForeground(controlTextColor);
                yearPanel.add(hourLabel);
            }
             /* *
             * 根据日期刷新显示面板
              */
             private   void  flushWeekAndDayPanal(Calendar c) {
     //             c.set
                c. set (Calendar.DAY_OF_MONTH,  1 );
                c.setFirstDayOfWeek( 0 );
                 int  firstdayofWeek  =  c. get (Calendar.DAY_OF_WEEK);
                 int  lastdayofWeek  =  c.getActualMaximum(Calendar.DAY_OF_MONTH);
                String colname[]  =  {
                     " 日 " ,  " 一 " ,  " 二 " ,  " 三 " ,  " 四 " ,  " 五 " ,  " 六 " };
                 int  today  =  getNowCalendar(). get (Calendar.DAY_OF_MONTH);
                 // 设置固定字体，以免调用环境改变影响界面美观
                dayPanel.setFont( new  java.awt.Font( " 宋体 " , java.awt.Font.PLAIN,  12 ));
                dayPanel.setLayout( new  GridBagLayout());
                dayPanel.setBackground(Color.white);
    
                JLabel cell;
    
                 for  ( int  i  =   0 ; i  <   7 ; i ++ ) {
                    cell  =   new  JLabel(colname[i]);
                    cell.setHorizontalAlignment(JLabel.CENTER);
                    cell.setPreferredSize( new  Dimension( 25 ,  25 ));
                     if  (i  ==   0   ||  i  ==   6 ) {
                        cell.setForeground(weekendFontColor);
                    }
                     else  {
                        cell.setForeground(weekFontColor);
                    }
                    dayPanel.add(cell,  new  GridBagConstraints(i,  0 ,  1 ,  1 ,  0.0 ,  0.0
                        , GridBagConstraints.CENTER,
                        GridBagConstraints.NONE,
                         new  Insets( 0 ,  0 ,  0 ,  0 ),  0 ,  0 )
                        );
                }
    
                 int  actionCommandId  =   1 ;
                 for  ( int  i  =   0 ; i  <   6 ; i ++ ) {
                     for  ( int  j  =   0 ; j  <   7 ; j ++ ) {
    
                        JButton numberButton  =  daysButton[i][j];
                        actionCommandId  =  Integer.parseInt(numberButton.
                            getActionCommand());
                         if  (actionCommandId  ==  today) {
                            numberButton.setBackground(todayBtnColor);
                        }
                         if  ( (actionCommandId  +  firstdayofWeek  -   2 )  %   7   ==   6   ||
                            (actionCommandId  +  firstdayofWeek  -   2 )  %   7   ==   0 ) {
                            numberButton.setForeground(weekendFontColor);
                        }
                         else  {
                            numberButton.setForeground(dateFontColor);
                        }

                         if  (actionCommandId  <=  lastdayofWeek) {
                             int  y  =   0 ;
                             if  ( (firstdayofWeek  -   1 )  <=
                                (j  +  firstdayofWeek  -   1 )  %   7 ) {
                                y  =  i  +   1 ;
                            }
                             else  {
                                y  =  i  +   2 ;
                            }
                            dayPanel.add(numberButton,
                                          new  GridBagConstraints( (j  +
                                firstdayofWeek  -
                                 1 )  %
                                 7 , y,  1 ,  1 ,  0.0 ,  0.0
                                , GridBagConstraints.CENTER,
                                GridBagConstraints.NONE,
                                 new  Insets( 0 ,  0 ,  0 ,  0 ),  0 ,  0 )
                                );
                        }
                    }
                }
            }
    
             private   int  getSelectedYear() {
                 return  ( (Integer) yearSpin.getValue()).intValue();
            }
    
             private   int  getSelectedMonth() {
                 return  ( (Integer) monthSpin.getValue()).intValue();
            }
    
             private   int  getSelectedHour() {
                 return  ( (Integer) hourSpin.getValue()).intValue();
            }
    
             /* *
             * 年月小时的事件处理
             * @param e ChangeEvent
              */
             public   void  stateChanged(ChangeEvent e) {
                JSpinner source  =  (JSpinner) e.getSource();
                 if  (source.getName().equals( " Hour " )) {
                    calendar. set (Calendar.HOUR_OF_DAY, getSelectedHour());
                     return ;
                }
                 if  (source.getName().equals( " Year " )) {
    
                    calendar. set (Calendar.YEAR, getSelectedYear());
                    dayPanel.removeAll();
                     this .flushWeekAndDayPanal(calendar);
                    dayPanel.revalidate();
                    dayPanel.updateUI();
                     return ;
                }
                 if  (source.getName().equals( " Month " )) {
                    calendar. set (Calendar.MONTH, getSelectedMonth()  -   1 );
    
                    dayPanel.removeAll();
                     this .flushWeekAndDayPanal(calendar);
                    dayPanel.revalidate();
                    dayPanel.updateUI();
                     return ;
                }
            }
    
             /* *
             * 日期按钮的鼠标事件处理
             * @param e MouseEvent
              */
             public   void  mouseClicked(MouseEvent e) {
                 if  (e.getButton()  ==  MouseEvent.BUTTON1  &&  e.getClickCount()  ==   1 ) {
                    JButton source  =  (JButton) e.getSource();
    
                    String value  =  source.getText();
                     int  day  =  Integer.parseInt(value);
                    calendar. set (Calendar.DAY_OF_MONTH, day);
                    Date selectDate  =   this .getSelectDate();
                    SimpleDateFormat simpleDateFormat  =   new  SimpleDateFormat(
                        pattern);
                    DateChooser. this .setText(simpleDateFormat.format(selectDate));
    
                     int  year  =  calendar. get (Calendar.YEAR);
                     int  month  =  calendar. get (Calendar.MONTH)  +   1 ;
     //         System.out.println(year + "年" + month + "月" + day + "日");
                    f.dispose();
                }
            }
    
             public   void  mousePressed(MouseEvent e) {
                 // 空实现接口中的方法，不能删除
            }
    
             public   void  mouseReleased(MouseEvent e) {
                 // 空实现接口中的方法，不能删除
            }
    
             /* *
             * 鼠标移动到日历中的事件
             * @param e MouseEvent
              */
             public   void  mouseEntered(MouseEvent e) {
                JButton jbutton  =  (JButton) e.getSource();
                jbutton.setBackground(moveButtonColor);
    
            }
    
             /* *
             * 鼠标移出日历中的事件
             * @param e MouseEvent
              */
             public   void  mouseExited(MouseEvent e) {
                JButton jbutton  =  (JButton) e.getSource();
                 int  comm  =  Integer.parseInt(jbutton.getActionCommand());
                 int  today  =  getNowCalendar(). get (Calendar.DAY_OF_MONTH);
                 if  (comm  ==  today) {
                    jbutton.setBackground(todayBtnColor);
                }
                 else  {
                    jbutton.setBackground(palletTableColor);
                }
            }
        }
    
         /* *
         * 内部类，改变按钮的边框不可编辑区，使外观更加协调。
          */
         class  DateChooserButton
            extends JButton {
             public  DateChooserButton(String text) {
                super(text);
            }
             public  Insets getInsets() {
                 return   new  Insets( 4 , 2 , 0 , 2 );
            }

            
        }
    }

二、SWT版
原文出处： http://www.blogjava.net/Hexise/archive/2006/12/29/90676.html

目前有几种方式提供SWT的时间控件:

1.eclipse 3.3自带的org.eclipse.swt.widgets.DateTime控件.
   eclipse 3.3版本增加了对日期选择控件的支持,下面是官方提供的示例代码:

import  org.eclipse.swt. * ;
import  org.eclipse.swt.events. * ;
import  org.eclipse.swt.layout. * ;
import  org.eclipse.swt.widgets. * ;

public   class  Snippet251  {

     public   static   void  main(String[] args)  {
        Display display  =   new  Display();
         final  Shell shell  =   new  Shell(display);
        shell.setLayout( new  FillLayout());

        Button open  =   new  Button(shell, SWT.PUSH);
        open.setText( " Open Dialog " );
        open.addSelectionListener( new  SelectionAdapter()  {
             public   void  widgetSelected(SelectionEvent e)  {
                 final  Shell dialog  =   new  Shell(shell, SWT.DIALOG_TRIM);
                dialog.setLayout( new  GridLayout( 3 ,  false ));

                 final  DateTime calendar  =   new  DateTime(dialog, SWT.CALENDAR
                         |  SWT.BORDER);
                 final  DateTime date  =   new  DateTime(dialog, SWT.DATE  |  SWT.SHORT);
                 final  DateTime time  =   new  DateTime(dialog, SWT.TIME  |  SWT.SHORT);

                 new  Label(dialog, SWT.NONE);
                 new  Label(dialog, SWT.NONE);
                Button ok  =   new  Button(dialog, SWT.PUSH);
                ok.setText( " OK " );
                ok.setLayoutData( new  GridData(SWT.FILL, SWT.CENTER,  false ,
                         false ));
                ok.addSelectionListener( new  SelectionAdapter()  {
                     public   void  widgetSelected(SelectionEvent e)  {
                        System.out
                                .println( " Calendar date selected (MM/DD/YYYY) =  "
                                         +  (calendar.getMonth()  +   1 )
                                         +   " / "
                                         +  calendar.getDay()
                                         +   " / "
                                         +  calendar.getYear());
                        System.out.println( " Date selected (MM/YYYY) =  "
                                 +  (date.getMonth()  +   1 )  +   " / "   +  date.getYear());
                        System.out.println( " Time selected (HH:MM) =  "
                                 +  time.getHours()  +   " : "   +  time.getMinutes());
                        dialog.close();
                    }
                } );
                dialog.setDefaultButton(ok);
                dialog.pack();
                dialog.open();
            }
        } );
        shell.pack();
        shell.open();

         while  ( ! shell.isDisposed())  {
             if  ( ! display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}

2.第三方提供的免费日期选择控件,例如DatePicker, 它是一个下拉列表框, 提供了日期选择的功能.它在sourceforge上的主页是 http://sourceforge.net/projects/swt-datepicker/

3.也可以自己实现日期选择控件,下面是一个实现的例子:（以下代码做了部分修改）

import  java.text.SimpleDateFormat;
import  java.util.Calendar;
import  java.util.Date;

import  org.eclipse.swt.SWT;
import  org.eclipse.swt.custom.CLabel;
import  org.eclipse.swt.events.MouseEvent;
import  org.eclipse.swt.events.MouseListener;
import  org.eclipse.swt.events.SelectionAdapter;
import  org.eclipse.swt.events.SelectionEvent;
import  org.eclipse.swt.graphics.Color;
import  org.eclipse.swt.layout.GridData;
import  org.eclipse.swt.layout.GridLayout;
import  org.eclipse.swt.widgets.Button;
import  org.eclipse.swt.widgets.Dialog;
import  org.eclipse.swt.widgets.Display;
import  org.eclipse.swt.widgets.Shell;

public   class  CalendarDialog  extends  Dialog  implements  MouseListener  ... {

    private Display display = null;

    private Date nowDate = null; // current date

    private String selectedDate = ""; // selected date

    private Shell shell = null;

    private GridLayout gridLayout = null;

    private GridData gridData = null;

    private CLabel sunday = null;

    private CLabel monday = null;

    private CLabel tuesday = null;

    private CLabel wednesday = null;

    private CLabel thursday = null;

    private CLabel friday = null;

    private CLabel saturday = null;

    private Button yearUp = null;

    private Button yearNext = null;

    private Button monthUp = null;

    private Button monthNext = null;

    private CLabel nowLabel = null;
    
    private CLabel nowTimeLabel = null;

    private CLabel[] days = new CLabel[42];

    private boolean hasChanged = false;

    public CalendarDialog(Shell parent, int style) ...{
        super(parent, style);
    }

    public CalendarDialog(Shell parent) ...{
        this(parent, 0);
    }

    private int getLastDayOfMonth(int year, int month) ...{
        if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8
                || month == 10 || month == 12) ...{
            return 31;
        }
        if (month == 4 || month == 6 || month == 9 || month == 11) ...{
            return 30;
        }
        if (month == 2) ...{
            if (isLeapYear(year)) ...{
                return 29;
            } else ...{
                return 28;
            }
        }
        return 0;
    }

    public boolean isLeapYear(int year) ...{
        return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
    }

    private void moveTo(int type, int value) ...{
        Calendar now = Calendar.getInstance(); // get current Calendar object
        now.setTime(nowDate); // set current date
        now.add(type, value); // add to spec time.
        nowDate = new Date(now.getTimeInMillis()); // result
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM");// format
        // date
        nowLabel.setText(formatter.format(nowDate)); // set to label
        nowTimeLabel.setText(new SimpleDateFormat("HH:mm").format(nowDate));
        setDayForDisplay(now);
    }

    private void setDayForDisplay(Calendar now) ...{
        int currentDay = now.get(Calendar.DATE);
        now.add(Calendar.DAY_OF_MONTH, -(now.get(Calendar.DATE) - 1)); //
        int startIndex = now.get(Calendar.DAY_OF_WEEK) - 1; //
        int year = now.get(Calendar.YEAR); //
        int month = now.get(Calendar.MONTH) + 1; //
        int lastDay = this.getLastDayOfMonth(year, month); //
        int endIndex = startIndex + lastDay - 1; //
        int startday = 1;
        for (int i = 0; i < 42; i++) ...{
            Color temp = days[i].getBackground();
            if (temp.equals(display.getSystemColor(SWT.COLOR_BLUE))) ...{
                days[i].setBackground(display.getSystemColor(SWT.COLOR_WHITE));
            }
        }
        for (int i = 0; i < 42; i++) ...{
            if (i >= startIndex && i <= endIndex) ...{
                days[i].setText("" + startday);
                if (startday == currentDay) ...{
                    days[i].setBackground(display
                            .getSystemColor(SWT.COLOR_BLUE)); //
                }
                startday++;
            } else ...{
                days[i].setText("");
            }
        }

    }

    public void previousYear() ...{
        moveTo(Calendar.YEAR, -1);
    }

    public void nextYear() ...{
        moveTo(Calendar.YEAR, 1);
    }

    public void nextMonth() ...{
        moveTo(Calendar.MONTH, 1);
    }

    public void previousMonth() ...{
        moveTo(Calendar.MONTH, -1);
    }

    public void previousHour()...{
        moveTo(Calendar.HOUR, -1);
    }
    
    public void nextHour() ...{
        moveTo(Calendar.HOUR, 1);
    }
    
    public void previousMin()...{
        moveTo(Calendar.MINUTE, -1);
    }
    
    public void nextMin() ...{
        moveTo(Calendar.MINUTE, 1);
    }
    
    public void mouseDoubleClick(MouseEvent e) ...{
    }

    public void mouseDown(MouseEvent e) ...{

        CLabel day = (CLabel) e.getSource();

        if (!day.getText().equals("")) ...{
            if(day.getText().length()==1)...{
                this.selectedDate = nowLabel.getText() + "-0" + day.getText() + " " + nowTimeLabel.getText();
            }else...{
                this.selectedDate = nowLabel.getText() + "-" + day.getText() + " " + nowTimeLabel.getText();
            }
            this.shell.close();
        }
        hasChanged = true;
    }

    public void mouseUp(MouseEvent e) ...{
    }

    public void open(int x, int y) ...{

        Shell parent = getParent();
        display = Display.getDefault();
        shell = new Shell(parent);
        shell.setBounds(x, y, 230, 230);

        hasChanged = false;

        gridLayout = new GridLayout();
        gridLayout.numColumns = 7;
        shell.setLayout(gridLayout);

        gridData = new GridData(GridData.FILL_HORIZONTAL);
        yearUp = new Button(shell, SWT.PUSH | SWT.FLAT);
        yearUp.setText("<");
        yearUp.setLayoutData(gridData);
        yearUp.addSelectionListener(new SelectionAdapter() ...{
            public void widgetSelected(SelectionEvent e) ...{
                previousYear();
            }
        });

        gridData = new GridData(GridData.FILL_HORIZONTAL);
        monthUp = new Button(shell, SWT.PUSH | SWT.FLAT);
        monthUp.setText("<<");
        monthUp.setLayoutData(gridData);
        monthUp.addSelectionListener(new SelectionAdapter() ...{
            public void widgetSelected(SelectionEvent e) ...{
                previousMonth();
            }
        });

        nowLabel = new CLabel(shell, SWT.CENTER | SWT.SHADOW_OUT);
        gridData = new GridData(GridData.FILL_HORIZONTAL);
        gridData.horizontalSpan = 3;
        nowLabel.setLayoutData(gridData);
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM");
        nowLabel.setText(formatter.format(new Date()));

        gridData = new GridData(GridData.FILL_HORIZONTAL);
        monthNext = new Button(shell, SWT.PUSH | SWT.FLAT);
        monthNext.setText(">>");
        monthNext.setLayoutData(gridData);
        monthNext.addSelectionListener(new SelectionAdapter() ...{
            public void widgetSelected(SelectionEvent e) ...{
                nextMonth();
            }
        });

        gridData = new GridData(GridData.FILL_HORIZONTAL);
        yearNext = new Button(shell, SWT.PUSH | SWT.FLAT);
        yearNext.setText(">");
        yearNext.setLayoutData(gridData);
        yearNext.addSelectionListener(new SelectionAdapter() ...{
            public void widgetSelected(SelectionEvent e) ...{
                nextYear();
            }
        });
        
        gridData = new GridData(GridData.FILL_HORIZONTAL);
        Button hourUp = new Button(shell, SWT.PUSH | SWT.FLAT);
        hourUp.setText("<");
        hourUp.setLayoutData(gridData);
        hourUp.addSelectionListener(new SelectionAdapter() ...{
            public void widgetSelected(SelectionEvent e) ...{
                previousHour();
            }
        });

        gridData = new GridData(GridData.FILL_HORIZONTAL);
        Button minUp = new Button(shell, SWT.PUSH | SWT.FLAT);
        minUp.setText("<<");
        minUp.setLayoutData(gridData);
        minUp.addSelectionListener(new SelectionAdapter() ...{
            public void widgetSelected(SelectionEvent e) ...{
                previousMin();
            }
        });

        nowTimeLabel = new CLabel(shell, SWT.CENTER | SWT.SHADOW_OUT);
        gridData = new GridData(GridData.FILL_HORIZONTAL);
        gridData.horizontalSpan = 3;
        nowTimeLabel.setLayoutData(gridData);
        SimpleDateFormat formatterTime = new SimpleDateFormat("HH:mm");
        nowTimeLabel.setText(formatterTime.format(new Date()));

        gridData = new GridData(GridData.FILL_HORIZONTAL);
        Button minNext = new Button(shell, SWT.PUSH | SWT.FLAT);
        minNext.setText(">>");
        minNext.setLayoutData(gridData);
        minNext.addSelectionListener(new SelectionAdapter() ...{
            public void widgetSelected(SelectionEvent e) ...{
                nextMin();
            }
        });

        gridData = new GridData(GridData.FILL_HORIZONTAL);
        Button hourNext = new Button(shell, SWT.PUSH | SWT.FLAT);
        hourNext.setText(">");
        hourNext.setLayoutData(gridData);
        hourNext.addSelectionListener(new SelectionAdapter() ...{
            public void widgetSelected(SelectionEvent e) ...{
                nextHour();
            }
        });

        sunday = new CLabel(shell, SWT.CENTER | SWT.SHADOW_OUT);
        gridData = new GridData(GridData.FILL_HORIZONTAL
                | GridData.FILL_VERTICAL);
        gridData.widthHint = 20;
        gridData.heightHint = 20;
        sunday.setLayoutData(gridData);
        sunday.setText("Sun");

        monday = new CLabel(shell, SWT.CENTER | SWT.SHADOW_OUT);
        gridData = new GridData(GridData.FILL_HORIZONTAL
                | GridData.FILL_VERTICAL);
        gridData.widthHint = 20;
        gridData.heightHint = 20;
        monday.setLayoutData(gridData);
        monday.setText("Mon");

        tuesday = new CLabel(shell, SWT.CENTER | SWT.SHADOW_OUT);
        gridData = new GridData(GridData.FILL_HORIZONTAL
                | GridData.FILL_VERTICAL);
        gridData.widthHint = 20;
        gridData.heightHint = 20;
        tuesday.setLayoutData(gridData);
        tuesday.setText("Tue");

        wednesday = new CLabel(shell, SWT.CENTER | SWT.SHADOW_OUT);
        gridData = new GridData(GridData.FILL_HORIZONTAL
                | GridData.FILL_VERTICAL);
        gridData.widthHint = 20;
        gridData.heightHint = 20;
        wednesday.setLayoutData(gridData);
        wednesday.setText("Wed");

        thursday = new CLabel(shell, SWT.CENTER | SWT.SHADOW_OUT);
        gridData = new GridData(GridData.FILL_HORIZONTAL
                | GridData.FILL_VERTICAL);
        gridData.widthHint = 20;
        gridData.heightHint = 20;
        thursday.setLayoutData(gridData);
        thursday.setText("Thu");

        friday = new CLabel(shell, SWT.CENTER | SWT.SHADOW_OUT);
        gridData = new GridData(GridData.FILL_HORIZONTAL
                | GridData.FILL_VERTICAL);
        gridData.widthHint = 20;
        gridData.heightHint = 20;
        friday.setLayoutData(gridData);
        friday.setText("Fri");

        saturday = new CLabel(shell, SWT.CENTER | SWT.SHADOW_OUT);
        gridData = new GridData(GridData.FILL_HORIZONTAL
                | GridData.FILL_VERTICAL);
        gridData.widthHint = 20;
        gridData.heightHint = 20;
        saturday.setLayoutData(gridData);
        saturday.setText("Sat");

        for (int i = 0; i < 42; i++) ...{
            days[i] = new CLabel(shell, SWT.FLAT | SWT.CENTER);
            gridData = new GridData(GridData.FILL_HORIZONTAL
                    | GridData.FILL_VERTICAL);
            days[i].setLayoutData(gridData);
            days[i].setBackground(display.getSystemColor(SWT.COLOR_WHITE));
            days[i].addMouseListener(this);
        }

        Calendar now = Calendar.getInstance(); //
        nowDate = new Date(now.getTimeInMillis());
        setDayForDisplay(now);

        shell.open();
        Display display = parent.getDisplay();
        while (!shell.isDisposed()) ...{
            if (!display.readAndDispatch()) ...{
                display.sleep();
            }
        }
    }

    public boolean isChanged() ...{
        return hasChanged;
    }

    public String getDateText() ...{
        return selectedDate.toString();
    }

}

三、为java万年历加上农历
原文出处： http://www.blogjava.net/soddabao/archive/2007/01/04/91729.html
前几天在blog中,对网友的java 万年历作 修改,看到有的网友说能不能加上农历,后来在网上看到有人写过几个阳历转阴历的算法,我比较了一个发现,这个算法还算不错,只要有的计算机编程基础的人看 明白应该是没有问题的,其实这个就和我们以前在c中,判断一天是周几的算法差不多,都是和某一个特定的时间作比较,算出差多少天,再根据月大月小瑞月这些 规则,算出是农历的那年那月那日.

package  clock;

import  java.text.ParseException;
import  java.text.SimpleDateFormat;
import  java.util.Calendar;
import  java.util.Date;

public   class  Lunar  {
    private int year;
    private int month;
    private int day;
    private boolean leap;
    final static String chineseNumber[] = {"一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二"};
    static SimpleDateFormat chineseDateFormat = new SimpleDateFormat("yyyy年MM月dd日");
    final static long[] lunarInfo = new long[]
    {0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2,
     0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2, 0x095b0, 0x14977,
     0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970,
     0x06566, 0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7, 0x0c950,
     0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557,
     0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950, 0x06aa0,
     0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0,
     0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6,
     0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570,
     0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0,
     0x0c960, 0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0, 0x0cab5,
     0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930,
     0x07954, 0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530,
     0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45,
     0x0b5a0, 0x056d0, 0x055b2, 0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0};

    //====== 传回农历 y年的总天数
    final private static int yearDays(int y) {
        int i, sum = 348;
        for (i = 0x8000; i > 0x8; i >>= 1) {
            if ((lunarInfo[y - 1900] & i) != 0) sum += 1;
        }
        return (sum + leapDays(y));
    }

    //====== 传回农历 y年闰月的天数
    final private static int leapDays(int y) {
        if (leapMonth(y) != 0) {
            if ((lunarInfo[y - 1900] & 0x10000) != 0)
                return 30;
            else
                return 29;
        } else
            return 0;
    }

    //====== 传回农历 y年闰哪个月 1-12 , 没闰传回 0
    final private static int leapMonth(int y) {
        return (int) (lunarInfo[y - 1900] & 0xf);
    }

    //====== 传回农历 y年m月的总天数
    final private static int monthDays(int y, int m) {
        if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0)
            return 29;
        else
            return 30;
    }

    //====== 传回农历 y年的生肖
    final public String animalsYear() {
        final String[] Animals = new String[]{"鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪"};
        return Animals[(year - 4) % 12];
    }

    //====== 传入 月日的offset 传回干支, 0=甲子
    final private static String cyclicalm(int num) {
        final String[] Gan = new String[]{"甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸"};
        final String[] Zhi = new String[]{"子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥"};
        return (Gan[num % 10] + Zhi[num % 12]);
    }

    //====== 传入 offset 传回干支, 0=甲子
    final public String cyclical() {
        int num = year - 1900 + 36;
        return (cyclicalm(num));
    }

    /** *//**
     * 传出y年m月d日对应的农历.
     * yearCyl3:农历年与1864的相差数              ?
     * monCyl4:从1900年1月31日以来,闰月数
     * dayCyl5:与1900年1月31日相差的天数,再加40      ?
     * @param cal 
     * @return 
     */
    public Lunar(Calendar cal) {
        @SuppressWarnings("unused") int yearCyl, monCyl, dayCyl;
        int leapMonth = 0;
        Date baseDate = null;
        try {
            baseDate = chineseDateFormat.parse("1900年1月31日");
        } catch (ParseException e) {
            e.printStackTrace();  //To change body of catch statement use Options | File Templates.
        }

        //求出和1900年1月31日相差的天数
        int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L);
        dayCyl = offset + 40;
        monCyl = 14;

        //用offset减去每农历年的天数
        // 计算当天是农历第几天
        //i最终结果是农历的年份
        //offset是当年的第几天
        int iYear, daysOfYear = 0;
        for (iYear = 1900; iYear < 2050 && offset > 0; iYear++) {
            daysOfYear = yearDays(iYear);
            offset -= daysOfYear;
            monCyl += 12;
        }
        if (offset < 0) {
            offset += daysOfYear;
            iYear--;
            monCyl -= 12;
        }
        //农历年份
        year = iYear;

        yearCyl = iYear - 1864;
        leapMonth = leapMonth(iYear); //闰哪个月,1-12
        leap = false;

        //用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天
        int iMonth, daysOfMonth = 0;
        for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {
            //闰月
            if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {
                --iMonth;
                leap = true;
                daysOfMonth = leapDays(year);
            } else
                daysOfMonth = monthDays(year, iMonth);

            offset -= daysOfMonth;
            //解除闰月
            if (leap && iMonth == (leapMonth + 1)) leap = false;
            if (!leap) monCyl++;
        }
        //offset为0时，并且刚才计算的月份是闰月，要校正
        if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {
            if (leap) {
                leap = false;
            } else {
                leap = true;
                --iMonth;
                --monCyl;
            }
        }
        //offset小于0时，也要校正
        if (offset < 0) {
            offset += daysOfMonth;
            --iMonth;
            --monCyl;
        }
        month = iMonth;
        day = offset + 1;
    }

    public static String getChinaDayString(int day) {
        String chineseTen[] = {"初", "十", "廿", "卅"};
        int n = day % 10 == 0 ? 9 : day % 10 - 1;
        if (day > 30)
            return "";
        if (day == 10)
            return "初十";
        else
            return chineseTen[day / 10] + chineseNumber[n];
    }

    public String toString() {
        return year + "年" + (leap ? "闰" : "") + chineseNumber[month - 1] + "月" + getChinaDayString(day);
    }

    public static void main(String[] args) throws ParseException {
        Calendar today = Calendar.getInstance();
        today.setTime(chineseDateFormat.parse("2003年1月1日"));
        Lunar lunar = new Lunar(today);

        System.out.println("北京时间：" + chineseDateFormat.format(today.getTime()) + "　农历" + lunar);
    }
}  

      在以前程序的label[i].setText(count +"");下设置label的浮动提示

             try   {
                now.setTime(chineseDateFormat.parse(year_log+"年"+(month_log+1)+"月"+count+"日"));
            }   catch  (ParseException e)  {
                e.printStackTrace();
            }
            label[i].setToolTipText( " 农历 " + new  Lunar(now));

就能出现这种效果: