java swing日历程序idea编程环境

package cn.lidan.mycalendar; import cn.lidan.utils.Const; import cn.lidan.vo.DayWeek; import cn.lidan.vo.YearMonth; import java.awt.Color; import java.awt.Dimension; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.util.Calendar; import javax.swing.*; public class YearMonthDay extends JFrame implements ActionListener{ //面板容器 private JPanel chooseJpl = new JPanel(); private JPanel weekJpl = new JPanel(); private JPanel dateJpl = new JPanel(); //年月日的选择框 private JComboBox cboYear = new JComboBox(); private JComboBox cboMonth = new JComboBox(); //年月日标签 private JLabel jLabel1 = new JLabel(); private JLabel jLabel2 = new JLabel(); private JLabel jLabel3 = new JLabel(); public void init(){ // 年的label jLabel3.setText("年"); // 月的label jLabel2.setText("月"); /** * 如果一容器使用了布局管理器 * 则该容器内的组件或容器（即该容器的下一级） * 应该使用setPreferredSize(new Dimension(w,h))来设置尺寸 */ /** * 如果一容器是绝对布局，即setLayout(null) * 则该容器内的组件或容器（即该容器的下一级） * 应该使用setSize(w,h))来设置尺寸 */ cboYear.setPreferredSize(new Dimension(100, 30)); cboMonth.setPreferredSize(new Dimension(100, 30)); chooseJpl.add(cboYear); chooseJpl.add(jLabel3); chooseJpl.add(cboMonth); chooseJpl.add(jLabel2); this.setTitle("万年历"); this.setResizable(false); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setBounds(Const.FRAME_X, Const.FRAME_Y,Const.FRAME_WIDTH, Const.FRAME_HEIGHT); this.setLayout(null); chooseJpl.setBounds(12, 10, 7*Const.SIZE, Const.SIZE); weekJpl.setBounds(12, 65, 7*Const.SIZE, Const.SIZE); dateJpl.setLocation(12, 115); this.add(chooseJpl); this.add(weekJpl); this.add(dateJpl); this.addYear(); this.addMonth(); this.addWeeks(); this.addDays(); this.setVisible(true); } public void addYear(){ for(int i = Const.FIRST_YEAR; i < Const.LAST_YEAR; i++){ this.cboYear.addItem(i); } this.cboYear.setSelectedItem(Calendar.getInstance().get(Calendar.YEAR)); } public void addMonth(){ for(int i=1; i<=12; i++){ this.cboMonth.addItem(i); } this.cboMonth.setSelectedItem(Calendar.getInstance().get(Calendar.MONTH)+1); } public void addWeeks(){ weekJpl.setLayout(new GridLayout(1,7)); for(int i = 0; i < Const.WEEKS.length; i++){ JLabel label = new JLabel(); label.setText(Const.WEEKS[i]); label.setSize(Const.SIZE, Const.SIZE); label.setHorizontalAlignment(SwingConstants.CENTER); weekJpl.add(label); } } public void addDays(){ //清空中间面板 clearCenterPanel(); DayWeek dayWeek = getWeekAndDay(); dateJpl.setLayout(null); dateJpl.setSize(7*Const.SIZE, ((dayWeek.getDay()+dayWeek.getWeek())/7+1)*Const.SIZE); for(int i=0; i<dayWeek.getDay(); i++){ JButton btn = new JButton(); btn.setSize(Const.SIZE, Const.SIZE); btn.setText((i+1)+""); btn.setBackground(Color.yellow); btn.setLocation(((i+dayWeek.getWeek())%7)*Const.SIZE, (i+dayWeek.getWeek())/7*Const.SIZE); btn.addActionListener(this); dateJpl.add(btn); } } public DayWeek getWeekAndDay(){ //获取年月 YearMonth ym = getSelectYearAndMonth(); Calendar cl = Calendar.getInstance(); cl.set(Calendar.YEAR, ym.getYear());//设置当前年 cl.set(Calendar.MONTH, ym.getMonth()-1);//设置当前月 cl.set(Calendar.DATE, 1);//设置当前年、当前月的第一天 因为需要计算一号是星期几 int week = cl.get(Calendar.DAY_OF_WEEK)-1;//当前年、当前月的第一天是星期几 cl.roll(Calendar.DATE, -1); int days = cl.get(Calendar.DATE); DayWeek dayWeek = new DayWeek(week,days); return dayWeek; } public YearMonth getSelectYearAndMonth(){ //获取年月 int year = Integer.parseInt(cboYear.getSelectedItem().toString()); int month = Integer.parseInt(cboMonth.getSelectedItem().toString()); YearMonth yearMonth = new YearMonth(year,month); return yearMonth; } public void clearCenterPanel(){ /** * 先用removeAll()移除了所有组件,但是并未刷新 * 所以单使用这个方法虽然内部组件确实改变了,但是界面显示可能会不变 * repaint()相当于刷新了整个面板 */ dateJpl.removeAll(); dateJpl.repaint(); } public void changeMonthHandler(){ cboMonth.addItemListener(new ItemListener(){ public void itemStateChanged(ItemEvent arg0) { if(arg0.getStateChange() == ItemEvent.SELECTED){ addDays(); } } }); } public void changeYearHandler(){ cboYear.addItemListener(new ItemListener(){ public void itemStateChanged(ItemEvent arg0) { //getStateChange() //返回状态更改的类型（已选定或已取消选定） if(arg0.getStateChange() == ItemEvent.SELECTED){ addDays(); } } }); } @Override public void actionPerformed(ActionEvent e) { YearMonth ym = getSelectYearAndMonth(); String day = e.getActionCommand().toString(); JOptionPane.showMessageDialog(null, ym.getYear()+"年" + ym.getMonth() + "月" + day + "日", "日期", JOptionPane.INFORMATION_MESSAGE); } /** * 程序入口 */ public static void main(String[] args) { YearMonthDay ymd = new YearMonthDay(); ymd.init(); ymd.changeMonthHandler(); ymd.changeYearHandler(); } }