//MainFrame.java

package com.huowolf.myCalender;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.GridLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Calendar;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class MainFrame extends JFrame{

	private static final long serialVersionUID = 90464999L;

	JPanel panel = new JPanel(new BorderLayout());

	JPanel panel1 = new JPanel();

	JPanel panel2 = new JPanel(new GridLayout(7, 7));

	JPanel panel3 = new JPanel();

	JLabel[] labels = new JLabel[49];

	JLabel y_label = new JLabel("年份");

	JLabel m_label = new JLabel("月份");

	JComboBox<String> com1 = new JComboBox<String>();

	JComboBox<String> com2 = new JComboBox<String>();

	int re_year,re_mouth;

	int x_size,y_size;

	//得到一个当前时间的日历对象

	Calendar now = Calendar.getInstance();

	public MainFrame() {

		super("万年历");

		setSize(300, 300);

		//获取屏幕宽度

		x_size = (int) Toolkit.getDefaultToolkit().getScreenSize().getWidth();

		//获取屏幕高度

		y_size = (int) Toolkit.getDefaultToolkit().getScreenSize().getHeight();

		setLocation((x_size - 300) / 2, (y_size - 350) / 2);

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        panel1.add(y_label);

        panel1.add(com1);

        panel1.add(m_label);

        panel1.add(com2);

        for (int i = 0; i < 49; i++) {

            labels[i] = new JLabel("", JLabel.CENTER);// 将显示的字符设置为居中

            panel2.add(labels[i]);

        }

       panel3.add(new Clock(this));

        panel.add(panel1, BorderLayout.NORTH);

        panel.add(panel2, BorderLayout.CENTER);

        panel.add(panel3, BorderLayout.SOUTH);

        panel.setBackground(Color.white);

        panel1.setBackground(Color.white);

        panel2.setBackground(Color.white);

        panel3.setBackground(Color.white);

        init();

        com1.addActionListener(new ClockAction());

        com2.addActionListener(new ClockAction());

        setContentPane(panel);

        setVisible(true);

        //禁止拖动

        setResizable(false);

	}

	class ClockAction implements ActionListener {

            public void actionPerformed(ActionEvent e) {

                int c_year, c_month, c_week;

                c_year = Integer.parseInt(com1.getSelectedItem().toString()); // 得到当前所选年份

                c_month = Integer.parseInt(com2.getSelectedItem().toString()) - 1; // 得到当前月份。并减1,计算机中的月为0－11

                c_week = use(c_year, c_month); // 调用函数use，得到星期几

                Resetday(c_week, c_year, c_month); // 调用函数Resetday

            }

        }

	public void init() {

        int year, month_num, first_day_num;

        String log[] = { "日", "一", "二", "三", "四", "五", "六" };

        for (int i = 0; i < 7; i++) {

            labels[i].setText(log[i]);

        }

        for (int i = 0; i < 49; i = i + 7) {

            labels[i].setForeground(Color.red); // 将星期日的日期设置为红色

        }

        for (int i = 6; i < 49; i = i + 7) {

            labels[i].setForeground(Color.green);// 将星期六的日期设置为绿色

        }

        for (int i = 1; i < 10000; i++) {

            com1.addItem("" + i);

        }

        for (int i = 1; i < 13; i++) {

            com2.addItem("" + i);

        }

        month_num = (int) (now.get(Calendar.MONTH)); // 得到当前时间的月份

        year = (int) (now.get(Calendar.YEAR)); // 得到当前时间的年份

        com1.setSelectedIndex(year - 1); // 设置下拉列表显示为当前年

        com2.setSelectedIndex(month_num); // 设置下拉列表显示为当前月

        first_day_num = use(year, month_num);

        Resetday(first_day_num, year, month_num);

	}

	  public int use(int reyear, int remonth) {

	        int week_num;

	        now.set(reyear, remonth, 1); // 设置时间为所要查询的年月的第一天

	        week_num = (int) (now.get(Calendar.DAY_OF_WEEK));// 得到第一天的星期

	        return week_num;

	    }

	  public void Resetday(int week_log, int year_log, int month_log) {

	        int month_day_score; // 存储月份的天数

	        int count =1;

	        month_day_score = 0;

	        Calendar cal = Calendar.getInstance();

	        /*cal.set(year_log+1900, month_log + 1, 1);

	        cal.add(Calendar.MONTH, -1); // 前个月

	        */

	        cal.set(year_log+1900, month_log, 1);

	        month_day_score = cal.getActualMaximum(Calendar.DAY_OF_MONTH);//得到一个月中最后一天

	        for (int i = 7; i < 49; i++) { // 初始化标签（除去前七个标签的下标值）

	            labels[i].setText("");

	        }

	        month_day_score = month_day_score + week_log;

	        for (int i = week_log; i < month_day_score; i++, count++) {

	            labels[i+6].setText(count + "");//加上前七个标签的下标值

	        }

	    }

	public static void main(String[] args) {

		 JFrame.setDefaultLookAndFeelDecorated(true);//为新创建的 JDialog提供其 Window 装饰的提示。

		 new MainFrame();

	}

}

//Clock.java

package com.huowolf.myCalender;

import java.awt.Canvas;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.text.SimpleDateFormat;

import java.util.Calendar;

public class Clock extends Canvas implements Runnable{

	private static final long serialVersionUID = 82782L;

	private Thread t;

	private String time;

     public Clock (MainFrame mf){

    	    setSize(280,40);

    	    setBackground(Color.white);

    	    t=new Thread(this);                //实例化线程

    	    t.start();

	  }

	@Override

	public void run() {

		while(true) {

				try {

				Thread.sleep(1000);    			//休眠1秒钟

			} catch (InterruptedException e) {

				System.out.println("发生异常");

			}

			repaint(100);//在100毫秒内重绘组件

		}

	}

		public void paint(Graphics g) {

			Font f=new Font("宋体",Font.BOLD,16);

		    SimpleDateFormat SDF=new SimpleDateFormat("yyyy'年'MM'月'dd'日'HH:mm:ss");//格式化时间显示类型

		    Calendar now=Calendar.getInstance();

		    time=SDF.format(now.getTime());        //获得当前日期和时间

		    g.setFont(f);

		    g.setColor(Color.orange);

		    g.drawString(time,45,25);

		}

}

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