gui小日历

package MyCal;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BorderLayout;
import javax.swing.JSpinner;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.SpinnerNumberModel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

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.JLabel;
import java.awt.Color;

public class MyCal {

    private JFrame frame;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    MyCal window = new MyCal();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public MyCal() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();//基本窗口框架
        frame.setBounds(100, 100, 569, 417);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JPanel panel1 = new JPanel();//上面的面板
        frame.getContentPane().add(panel1, BorderLayout.NORTH);
        
        JSpinner spinner = new JSpinner();//年份微调
        spinner.setModel(new SpinnerNumberModel(2016, 1970, 2100, 1));
        panel1.add(spinner);
        
        JComboBox comboBox = new JComboBox();//月份微调
        comboBox.setModel(new DefaultComboBoxModel(new String[] {"\u4E00\u6708", "\u4E8C\u6708", "\u4E09\u6708", "\u56DB\u6708", "\u4E94\u6708", "\u516D\u6708", "\u4E03\u6708", "\u516B\u6708", "\u4E5D\u6708", "\u5341\u6708", "\u5341\u4E00\u6708", "\u5341\u4E8C\u6708"}));
        comboBox.setMaximumRowCount(12);
        panel1.add(comboBox);
        
        JPanel panel3 = new JPanel();//下面面板
        frame.getContentPane().add(panel3, BorderLayout.SOUTH);
        
        JLabel label1 = new JLabel("选择一个年份或月份日历开始启动");//添加label说明
        label1.setForeground(Color.RED);
        panel3.add(label1);
        
        JPanel panel2 = new JPanel();//中间面板，主面板
        frame.getContentPane().add(panel2, BorderLayout.CENTER);
        panel2.setLayout(new GridLayout(7, 7, 0, 0));
        
        ItemPolice itemPolice1=new ItemPolice();//new一个监视器
        itemPolice1.setCal(spinner, comboBox,panel2,label1);//组合
        itemPolice1.show();//显示开始日历
        comboBox.addItemListener(itemPolice1);//下拉项添加监视器
        spinner.addChangeListener(itemPolice1);//微调添加监视器
    }
}

class CalendarHuang{
    int year,month;
    void setYearAndMonth(int a,int b){
        year=a;
        month=b;
    }
    String[] getCalendar(){
        String []a=new String[42];
        Calendar Calender1=Calendar.getInstance();
        Calender1.set(year, month-1,1);
        int weekday=Calender1.get(Calender1.DAY_OF_WEEK)-1;
//        System.out.println(month);
        int day = 0;
        if(month==1||month==3||month==5||month==7||month==8||month==10||month==12){
            day=31;
        }else if(month==4||month==6||month==9|month==11)
            day=30;
        else if(month==2){
            if(year%4==0&&year%100!=0||year%400==0)
                day=29;
            else 
                day=28;
        }
        for(int i=0;i<weekday;i++)
            a[i]=" ";
        for(int i=weekday,n=1;i<weekday+day;i++){
            a[i]=String.valueOf(n);
            n++;
        }
        for(int i=weekday+day;i<a.length;i++){
            a[i]=" ";
        }
        return a;
    }
}

class ItemPolice implements ItemListener,ChangeListener,ActionListener{//实现ItemListener接口的类
    JSpinner combo1;//微调项
    JComboBox combo2;//下拉项
    JPanel panel2;//主面板
    JLabel label1;//说明标签
    String day[]=new String[42];//天数
    CalendarHuang cal1=new CalendarHuang();//日历类
    int year=2016,month=1;//开始值
    void show(){//开始先有一个月份
        String s1[]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
        for(int i=0;i<7;i++){
            panel2.add(new JLabel(s1[i]));
        }
        cal1.setYearAndMonth(year, month);
        day=cal1.getCalendar();
        for(int i=0;i<day.length;i++){
            panel2.add(new JButton(day[i]));
        }
    }
    void setCal(JSpinner combox1,JComboBox combox2,JPanel panel2,JLabel label1){//组合
        this.combo1=combox1;
        this.combo2=combox2;
        this.panel2=panel2;
        this.label1=label1;
    }
    public void itemStateChanged(ItemEvent e){//下拉事件
        panel2.removeAll();  
        panel2.revalidate();
        panel2.getParent().repaint();
        month=combo2.getSelectedIndex()+1;
        String s1[]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
        for(int i=0;i<7;i++){
            panel2.add(new JLabel(s1[i]));
        }
        cal1.setYearAndMonth(year, month);
        day=cal1.getCalendar();
        for(int i=0;i<day.length;i++){
            JButton button2=new JButton(day[i]);
            button2.addActionListener(this);
            panel2.add(button2);
        }
    }
    public void stateChanged(ChangeEvent e) {//微调事件
        panel2.removeAll();  
        panel2.revalidate();
        panel2.getParent().repaint();
        year=Integer.parseInt(combo1.getValue().toString());
        String s1[]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
        for(int i=0;i<7;i++){
            panel2.add(new JLabel(s1[i]));
        }
        cal1.setYearAndMonth(year, month);
        day=cal1.getCalendar();
        for(int i=0;i<day.length;i++){
            JButton button2=new JButton(day[i]);
            button2.addActionListener(this);
            panel2.add(button2);
        }
    }
    public void actionPerformed(ActionEvent e) {//按钮事件
        String s=e.getActionCommand();
        label1.setText("日期是："+year+" 年 "+month+" 月 "+s+" 日");
    }
}