swing 初级学习（三）日期控件

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

public class MyCalendar extends JApplet {

    public static final String WEEK_SUN = "日";

    public static final String WEEK_MON = "一";

    public static final String WEEK_TUE = "二";

    public static final String WEEK_WED = "三";

    public static final String WEEK_THU = "四";

    public static final String WEEK_FRI = "五";

    public static final String WEEK_SAT = "六";

    public static final Color background = Color.white;

    public static final Color foreground = Color.black;

    public static final Color headerBackground = Color.blue;

    public static final Color headerForeground = Color.white;

    public static final Color selectedBackground = Color.blue;

    public static final Color selectedForeground = Color.white;

    private JPanel cPane;

    private JLabel yearsLabel;

    private JSpinner yearsSpinner;

    private JLabel monthsLabel;

    private JComboBox monthsComboBox;

    private JTable daysTable;

    private AbstractTableModel daysModel;

    private Calendar calendar;

    private String value;

    public String getValue() {
        return this.value;
    }

    public MyCalendar() {
        cPane = (JPanel) getContentPane();
    }

    public void init() {
        cPane.setLayout(new BorderLayout());

        calendar = Calendar.getInstance();
        calendar = Calendar.getInstance();
        yearsLabel = new JLabel("年: ");
        yearsSpinner = new JSpinner();
        yearsSpinner.setEditor(new JSpinner.NumberEditor(yearsSpinner, "0000"));
        yearsSpinner.setValue(new Integer(calendar.get(Calendar.YEAR)));
        yearsSpinner.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent changeEvent) {
                int day = calendar.get(Calendar.DAY_OF_MONTH);
                calendar.set(Calendar.DAY_OF_MONTH, 1);
                calendar.set(Calendar.YEAR, ((Integer) yearsSpinner.getValue())
                        .intValue());
                int maxDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                calendar
                        .set(Calendar.DAY_OF_MONTH, day > maxDay ? maxDay : day);
                updateView();
            }
        });

        JPanel yearMonthPanel = new JPanel();
        cPane.add(yearMonthPanel, BorderLayout.NORTH);
        yearMonthPanel.setLayout(new BorderLayout());
        yearMonthPanel.add(new JPanel(), BorderLayout.CENTER);
        JPanel yearPanel = new JPanel();
        yearMonthPanel.add(yearPanel, BorderLayout.WEST);
        yearPanel.setLayout(new BorderLayout());
        yearPanel.add(yearsLabel, BorderLayout.WEST);
        yearPanel.add(yearsSpinner, BorderLayout.CENTER);

        monthsLabel = new JLabel("月: ");
        monthsComboBox = new JComboBox();
        for (int i = 1; i <= 12; i++) {
            monthsComboBox.addItem(new Integer(i));
        }
        monthsComboBox.setSelectedIndex(calendar.get(Calendar.MONTH));
        monthsComboBox.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent actionEvent) {
                int day = calendar.get(Calendar.DAY_OF_MONTH);
                calendar.set(Calendar.DAY_OF_MONTH, 1);
                calendar.set(Calendar.MONTH, monthsComboBox.getSelectedIndex());
                int maxDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                calendar
                        .set(Calendar.DAY_OF_MONTH, day > maxDay ? maxDay : day);
                updateView();
            }
        });
        JPanel monthPanel = new JPanel();
        yearMonthPanel.add(monthPanel, BorderLayout.EAST);
        monthPanel.setLayout(new BorderLayout());
        monthPanel.add(monthsLabel, BorderLayout.WEST);
        monthPanel.add(monthsComboBox, BorderLayout.CENTER);

        daysModel = new AbstractTableModel() {
            public int getRowCount() {
                return 7;
            }

            public int getColumnCount() {
                return 7;
            }

            public Object getValueAt(int row, int column) {
                if (row == 0) {
                    return getHeader(column);
                }
                row--;
                Calendar calendar = (Calendar) MyCalendar.this.calendar.clone();
                calendar.set(Calendar.DAY_OF_MONTH, 1);
                int dayCount = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                int moreDayCount = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                int index = row * 7 + column;
                int dayIndex = index - moreDayCount + 1;
                if (index < moreDayCount || dayIndex > dayCount) {
                    return null;
                } else {
                    return new Integer(dayIndex);
                }
            }
        };

        daysTable = new CalendarTable(daysModel, calendar);
        daysTable.setCellSelectionEnabled(true);
        daysTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

        daysTable.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent e) {
                if (e.getClickCount() == 2) {
                    Object o = daysTable.getValueAt(daysTable.getSelectedRow(),
                            daysTable.getSelectedColumn());
                    if (o != null) {
                        // 不是点在空的格子，赋值
                        value = yearsSpinner.getValue()
                                + monthsComboBox.getSelectedItem().toString()
                                + o;
                        System.out.println(value);
                    } else {
                        // 否则清空
                        value = "";
                    }

                }
            }
        });
        daysTable.setDefaultRenderer(daysTable.getColumnClass(0),
                new TableCellRenderer() {
                    public Component getTableCellRendererComponent(
                            JTable table, Object value, boolean isSelected,
                            boolean hasFocus, int row, int column) {
                        String text = (value == null) ? "" : value.toString();
                        JLabel cell = new JLabel(text);
                        cell.setOpaque(true);
                        if (row == 0) {
                            cell.setForeground(headerForeground);
                            cell.setBackground(headerBackground);
                        } else {
                            if (isSelected) {
                                cell.setForeground(selectedForeground);
                                cell.setBackground(selectedBackground);
                            } else {
                                cell.setForeground(foreground);
                                cell.setBackground(background);
                            }
                        }

                        return cell;
                    }
                });
        updateView();

        cPane.add(daysTable, BorderLayout.CENTER);
    }

    public static String getHeader(int index) {
        switch (index) {
        case 0:
            return WEEK_SUN;
        case 1:
            return WEEK_MON;
        case 2:
            return WEEK_TUE;
        case 3:
            return WEEK_WED;
        case 4:
            return WEEK_THU;
        case 5:
            return WEEK_FRI;
        case 6:
            return WEEK_SAT;
        default:
            return null;
        }
    }

    public void updateView() {
        daysModel.fireTableDataChanged();
        daysTable.setRowSelectionInterval(calendar.get(Calendar.WEEK_OF_MONTH),
                calendar.get(Calendar.WEEK_OF_MONTH));
        daysTable.setColumnSelectionInterval(
                calendar.get(Calendar.DAY_OF_WEEK) - 1, calendar
                        .get(Calendar.DAY_OF_WEEK) - 1);
    }

    public static class CalendarTable extends JTable {
        private Calendar calendar;

        public CalendarTable(TableModel model, Calendar calendar) {
            super(model);
            this.calendar = calendar;
        }

        public void changeSelection(int row, int column, boolean toggle,
                boolean extend) {
            super.changeSelection(row, column, toggle, extend);
            if (row == 0) {
                return;
            }
            Object obj = getValueAt(row, column);
            if (obj != null) {
                calendar.set(Calendar.DAY_OF_MONTH, ((Integer) obj).intValue());
            }
        }

    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Calendar Application");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        MyCalendar myCalendar = new MyCalendar();
        myCalendar.init();
        frame.getContentPane().add(myCalendar);
        frame.setSize(240, 172);
        frame.show();

    }

}