Java制作的日期选择控件

 Java制作的日期选择控件，经测试没有问题，主要包括以下类：

主类：CDateComponent

           提供二个方法：

            getSelectedDateByString()：以字符串的形式返回选择的日期

            getSelectedDate()：以java.util.Date的形式返回选择的日期

内部类：DateComponent，日期选择窗口

               YearAndMonthPanel，选择年和月份面板

               WeekPanel，星期显示面板

               DayPanel，日选择面板

               Handler，处理鼠标点击事件，显示日期选择窗口

运行效果如下：

            

程序代码如下：          

import javax.swing.*;
import java.util.Date;
import java.util.Calendar;
import java.text.DateFormat;
import java.awt.event.*;
import java.awt.*;

/** *//**
 * Created by IntelliJ IDEA.
 * User: cxwu
 * Date: 2007-12-13
 * Time: 21:50:20
 * To change this template use File | Settings | File Templates.
 */
public class CDateComponent extends JPanel...{
    private JTextField txtShow;
    private boolean isShow = false; //do the DataComponent display?
    private JComboBox cbxYear;
    private JComboBox cbxMonth;
    private DayPanel dp;
    private DateComponent dc;//DateComponent view for user selecting date
    public CDateComponent()...{
        txtShow = new JTextField(15);
        Icon icon = new ImageIcon("src/images/calendar.gif");
        JLabel lblIcon = new JLabel(icon);
        add(txtShow);
        add(lblIcon);
        lblIcon.addMouseListener(new Handler());
        setBorder(BorderFactory.createRaisedBevelBorder());
    }
    //get the user selected date by java.lang.String
    public String getSelectedDateByString()...{
        return txtShow.getText().trim();
    }
    //get the user selected date by java.util.Date
    public Date getSelectedDate()...{
        DateFormat df = DateFormat.getDateInstance();
        Date date = new Date();
        try...{
            date = df.parse(getSelectedDateByString());
        }catch(Exception e)...{
            System.out.println("日期的格式不对！");
        }
        return date;
    }
    //handler mouse event on txtShow,to show the DateComponent view on screen
    class Handler extends MouseAdapter...{
        public void mousePressed(MouseEvent e) ...{
            if(!isShow)...{
                isShow = true;
                Point pt = e.getPoint();
                SwingUtilities.convertPointToScreen(pt,(JLabel)e.getSource());
                Dimension screen = getToolkit().getScreenSize();
                dc = new DateComponent();
                //decided the position of the DateComponent view
                int x = pt.x + 5;
                int y = pt.y + 5;
                int w = 360;
                int h = 230;
                if(screen.getWidth() < (x + w) && screen.getHeight() < (y + h))...{
                    x = x - 360;
                    y = y - 230;
                }else if(screen.getWidth() < (x + w))...{
                    x = x - 360;
                }else if(screen.getHeight() < (y + h))...{
                    y = y - 230;
                }
                dc.setBounds(x,y,w,h);
                dc.setVisible(true);
            }
        }
    }
    //supply the Year and the Month list for the user selecting
    class YearAndMonthPanel extends JPanel...{
        JButton btnLeftYear;
        JButton btnRightYear;
        JButton btnLeftMonth;
        JButton btnRightMonth;
        public YearAndMonthPanel()...{
            setLayout(new FlowLayout(0,4,0));
            btnLeftYear = new JButton("<<");
            btnRightYear = new JButton(">>");
            btnLeftMonth = new JButton("<<");
            btnRightMonth = new JButton(">>");
            cbxYear = new JComboBox();
            cbxYear.setPreferredSize(new Dimension(64,27));
            cbxMonth = new JComboBox();
            cbxMonth.setPreferredSize(new Dimension(64,27));
            addYearAndMonth();
            add(btnLeftYear);
            add(cbxYear);
            add(btnRightYear);
            add(btnLeftMonth);
            add(cbxMonth);
            add(btnRightMonth);
            btnLeftYear.addActionListener(new ActionListener() ...{
                public void actionPerformed(ActionEvent e) ...{
                    int index = cbxYear.getSelectedIndex();
                    if(index == 0)...{
                        return;
                    }
                    cbxYear.setSelectedIndex(index - 1);
                    updateDayShow();
                }
            });
            btnRightYear.addActionListener(new ActionListener() ...{
                public void actionPerformed(ActionEvent e) ...{
                    int index = cbxYear.getSelectedIndex();
                    if(index == cbxYear.getItemCount() - 1)...{
                        return;
                    }
                    cbxYear.setSelectedIndex(index + 1);
                    updateDayShow();
                }
            });
            btnLeftMonth.addActionListener(new ActionListener() ...{
                public void actionPerformed(ActionEvent e) ...{
                    int index = cbxMonth.getSelectedIndex();
                    if(index == 0)...{
                        return;
                    }
                    cbxMonth.setSelectedIndex(index - 1);
                    updateDayShow();
                }
            });
            btnRightMonth.addActionListener(new ActionListener() ...{
                public void actionPerformed(ActionEvent e) ...{
                    int index = cbxMonth.getSelectedIndex();
                    if(index == 11)...{
                        return;
                    }
                    cbxMonth.setSelectedIndex(index + 1);
                    updateDayShow();
                }
            });
            cbxYear.addItemListener(new ItemListener() ...{
                public void itemStateChanged(ItemEvent e) ...{
                    updateDayShow();
                }
            });
            cbxMonth.addItemListener(new ItemListener() ...{
                public void itemStateChanged(ItemEvent e) ...{
                    updateDayShow();
                }
            });
        }
        //update the DayPanel according to the selected Year and Month
        private void updateDayShow()...{
            Calendar currentDate = Calendar.getInstance();
            currentDate.set(Integer.parseInt((String)cbxYear.getSelectedItem()),
                    Integer.parseInt((String)cbxMonth.getSelectedItem()) - 1,
                    currentDate.get(Calendar.DAY_OF_MONTH));
            dp.updateShow(currentDate);
        }
        private void addYearAndMonth()...{
            for (int i = 1900; i < 2045; i++) ...{
                cbxYear.addItem(String.valueOf(i));
            }
            for (int i = 1; i < 13; i++) ...{
                cbxMonth.addItem(String.valueOf(i));
            }
            Calendar now = Calendar.getInstance();
            //selected the current data defaultly
            cbxYear.setSelectedItem(String.valueOf(now.get(Calendar.YEAR)));
            cbxMonth.setSelectedItem(String.valueOf(now.get(Calendar.MONTH) + 1));
        }

    }
    //display week information
    class WeekPanel extends JPanel...{
        public WeekPanel()...{
            JLabel lblSun,lblMon,lblTues,lblWed,lblThur,lblFri,lblSat;
            lblSun = new JLabel("Sun",SwingConstants.CENTER);
            lblMon = new JLabel("Mon",SwingConstants.CENTER);
            lblTues = new JLabel("Tues",SwingConstants.CENTER);
            lblWed = new JLabel("Web",SwingConstants.CENTER);
            lblThur = new JLabel("Thur",SwingConstants.CENTER);
            lblFri = new JLabel("Fri",SwingConstants.CENTER);
            lblSat = new JLabel("Sat",SwingConstants.CENTER);
            lblSun.setForeground(Color.BLUE);
            lblMon.setForeground(Color.BLUE);
            lblTues.setForeground(Color.BLUE);
            lblWed.setForeground(Color.BLUE);
            lblThur.setForeground(Color.BLUE);
            lblFri.setForeground(Color.BLUE);
            lblSat.setForeground(Color.BLUE);
            setLayout(new GridLayout(1,7));
            add(lblSun);
            add(lblMon);
            add(lblTues);
            add(lblWed);
            add(lblThur);
            add(lblFri);
            add(lblSat);
            setBorder(BorderFactory.createLineBorder(Color.BLUE));
            setPreferredSize(new Dimension(340,25));
        }
    }
    //display days of month,according to the month and the year,decided how to list all days
    class DayPanel extends JPanel implements ActionListener...{
        JButton[] dayList;
        JButton selectedBtn;
        public DayPanel()...{
            dayList = new JButton[42];
            setLayout(new GridLayout(6,7,0,0));
            for (int i = 0; i < dayList.length; i++) ...{
                dayList[i] = new JButton();
                add(dayList[i]);
                dayList[i].setPreferredSize(new Dimension(48,25));
            }
            setBorder(BorderFactory.createLineBorder(Color.blue));
            updateShow(Calendar.getInstance());
        }
        //update view according to the selected year and month
        public void updateShow(Calendar selectedDate)...{
            for (int i = 0; i < dayList.length; i++) ...{
                dayList[i].setVisible(true);
                dayList[i].setForeground(Color.BLACK);
            }
            int dayOfMonth = selectedDate.get(Calendar.DAY_OF_MONTH);
            selectedDate.set(Calendar.DAY_OF_MONTH,1);
            int dayOfWeek = selectedDate.get(Calendar.DAY_OF_WEEK);
            int[] days = countDay(selectedDate);
            int currentDay = 0;
            for (int i = 0; i < days.length; i++) ...{
                if(days[i] == 0)...{
                    dayList[i].setVisible(false);
                }else...{
                    currentDay++;
                    dayList[i].setText(String.valueOf(currentDay));
                    dayList[i].addActionListener(this);
                }
            }
            dayList[dayOfMonth + dayOfWeek - 2].setForeground(Color.red);
            repaint();
        }
        //count the days of the month
        private int[] countDay(Calendar selectedDate)...{
            int[] day = new int[42];
            int oldMonth = selectedDate.get(Calendar.MONTH);
            int dayOfWeek = selectedDate.get(Calendar.DAY_OF_WEEK);
            boolean isNextMonth = true;
            int allDay = 0;
            while(isNextMonth)...{
                selectedDate.add(Calendar.DAY_OF_MONTH,1);
                if(oldMonth != selectedDate.get(Calendar.MONTH))...{
                    isNextMonth = false;
                }
                allDay++;
            }
            for(int i = 0;i < allDay;i++)...{
                day[dayOfWeek - 1 + i] = 1;
            }
            return day;
        }
        //show the selected data in txtShow by java.lang.String 
        public void actionPerformed(ActionEvent e) ...{
            JButton source = (JButton)e.getSource();
            dc.dispose();
            String s = cbxYear.getSelectedItem() + "-"
                    + cbxMonth.getSelectedItem() + "-"
                    + source.getText().trim();
            txtShow.setText(s);
            isShow = false;
        }
    }
    //compose the YearAndMonthPanel,the WeekPanel and the DayPanel into the DateComponent view
    class DateComponent extends JWindow...{
        public DateComponent()...{
            Container c = getContentPane();
            JPanel pnlMain = new JPanel();
            YearAndMonthPanel yamp = new YearAndMonthPanel();
            WeekPanel wp = new WeekPanel();
            dp = new DayPanel();
            pnlMain.add(yamp);
            pnlMain.add(wp);
            pnlMain.add(dp);
            c.add(pnlMain, BorderLayout.CENTER);
            getRootPane().setBorder(BorderFactory.createLineBorder(Color.orange));
            setVisible(true);
            pack();
            setAlwaysOnTop(true);
        }
    }
}