Java 由浅入深GUI编程实战练习（三）

一，項目介紹

1.可以查看年，月，日等功能。能获取今天的日期，并且能够通过下拉年，月的列表。

2.当程序运行时，显示的时间是系统当前时间。

3.可以手动输入时间，确定后系统跳转到制定的时间。

4.提供一种点击功能，通过点击实现年份，月份的自增和自减功能。

二，运行界面

三，代码详情

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

public class Demo6 extends JApplet {
 private static final long serialVersionUID = 1L;
 public static final String WEEK_SUN = "SUN";
    public static final String WEEK_MON = "MON";
    public static final String WEEK_TUE = "TUE";
    public static final String WEEK_WED = "WED";
    public static final String WEEK_THU = "THU";
    public static final String WEEK_FRI = "FRI";
    public static final String WEEK_SAT = "SAT";

    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<Integer> monthsComboBox;
    private JTable daysTable;
    private AbstractTableModel daysModel;
    private Calendar calendar; 

    public Demo6() {
        cPane = (JPanel) getContentPane();
    }

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

        calendar = Calendar.getInstance(); 

        yearsLabel = new JLabel("Year: ");
        yearsSpinner = new JSpinner();
        //利用编辑器
        yearsSpinner.setEditor(new JSpinner.NumberEditor(yearsSpinner, "0000"));
        yearsSpinner.setValue(new Integer(calendar.get(Calendar.YEAR)));
        yearsSpinner.addChangeListener(new ChangeListener() {

            @Override
            public void stateChanged(ChangeEvent e) {
                // TODO Auto-generated method stub
                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("Month: ");
        monthsComboBox = new JComboBox<Integer>();
        for (int i = 1; i <= 12; i++) {
            monthsComboBox.addItem(new Integer(i));
        }
        monthsComboBox.setSelectedIndex(calendar.get(Calendar.MONTH));
        monthsComboBox.addActionListener(new ActionListener() { 

                @Override
                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() {
                /**
    *
    */
   private static final long serialVersionUID = -3517455337953024330L;
                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) Demo6.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.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 static final long serialVersionUID = 1L;
  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);
        Demo6 myCalendar = new Demo6();
        myCalendar.init();
        frame.getContentPane().add(myCalendar);
        frame.setSize(240, 172); 

    }
}