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); 
      
    }
}