datejframe.java

一个用java语言编写的日历查看程序

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;
import javax.swing.border.*;
class DateJFrame extends JFrame{
    JPanel panel=new JPanel(new BorderLayout());
    JPanel panel1=new JPanel();
    JPanel panel2=new JPanel(new GridLayout(7,7));
    
    JPanel panel3=new JPanel();
    
    JLabel []label=new JLabel[49];
    JLabel y_label=new JLabel("年份");
    JLabel m_label=new JLabel("月份");
    JComboBox com1=new JComboBox();
    JComboBox com2=new JComboBox();
    Color color=new Color(1,1,200,150);        //定义一种颜色
    JButton button=new JButton("查看");
    int re_year,re_month;
    int x_size,y_size;
    String year_num;
	Font font=new Font("宋体",Font.ITALIC,20);
	Font font2=new Font("楷体",Font.PLAIN,18);
    Calendar now=Calendar.getInstance();    //实例化Calendar
	Calendar now2=Calendar.getInstance();
    DateJFrame()
    {
        super("日历-dreamboy");
        setSize(300,350);
        x_size=(int)(Toolkit.getDefaultToolkit().getScreenSize().getWidth());
        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);
        panel1.add(button);
        for(int i=0;i<49;i++)
        {
            label[i]=new JLabel("",JLabel.CENTER);//将显示的字符设置为居中
            label[i].setBorder(LineBorder.createBlackLineBorder());
            panel2.add(label[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);
        panel2.setBackground(Color.white);
        panel3.setBackground(Color.blue);
        Init();
        button.addActionListener(new 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
			}
            }
            );
        setContentPane(panel);
        setVisible(true);
        setResizable(false);
    }
    public void setForeground()
    {
      for(int i=0;i<49;i=i+7)
      {
        label[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)
      {
        label[i].setForeground(Color.green);//将星期六的日期设置为绿色
      }
    }
    public void Init()                                  
    {                                    
      int year,month_num,first_day_num;
      String log[]={"日","一","二","三","四","五","六"};   //定义周期         
      for(int i=0;i<7;i++)
      {
      label[i].setText(log[i]);
      }                                                             //
      setForeground();
      for(int i=1990;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-1990);                //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_score_log;    //判断是否是闰年的标记
        int month_day_score;    //存储月份的天数
        int count;
        month_score_log=0;
        month_day_score=0;
        count=1;
        if(year_log%4==0&&year_log%100!=0||year_log%400==0)         //判断是否为闰年
        {
            month_score_log=1;
        }
        month_log=month_log+1;    //将传来的月份数加1
        switch(month_log){
          case 1:
          case 3:
          case 5:
          case 7:
          case 8:
          case 10:
          case 12:
          month_day_score=31;
          break;
          case 4:
          case 6:
          case 9:
          case 11:
          month_day_score=30;
          break;
          case 2:
          if(month_score_log==1)
          {
           month_day_score=29;    
          } 
          else{
           month_day_score=28;
          }
          break;
        }
        for(int i=7;i<49;i++)        //初始化标签
        {        
            label[i].setText("");
            
        }
        week_log=week_log+6;        //将星期数加6，使显示正确
        month_day_score=month_day_score+week_log;
        for(int i=week_log;i<month_day_score;i++,count++)
        {
			
			if(count==((int)(now2.get(Calendar.DATE)))&&year_log==((int)(now2.get(Calendar.YEAR)))&&(month_log-1)==((int)(now2.get(Calendar.MONTH))))
			{
				label[i].setBorder(new LineBorder(Color.red,10));
				label[i].setFont(font);
				label[i].setForeground(color);
			}
			else{
				label[i].setFont(font2);
				label[i].setForeground(Color.black);
				label[i].setBackground(Color.white);
				label[i].setBorder(LineBorder.createBlackLineBorder());
				setForeground();
			}
			
            label[i].setText(count+"");
			
        }
    }
    
    
    public static void main(String [] args)
    {
         new DateJFrame();
    }    
}
class Clock extends Canvas implements Runnable{
    DateJFrame mf;
    Thread t;
    String time;
    Clock(DateJFrame mf){
    this.mf=mf;
    setSize(400,40);
    setBackground(Color.white);
    t=new Thread(this);                //实例化线程
    t.start();                        //调用线程    
    }
    public void run(){
    while(true){
    try{
    t.sleep(1000);                    //休眠1秒钟
    }catch(InterruptedException e){
    System.out.println("异常");
    }
    this.repaint(100);
    }
    }
    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="今天是："+SDF.format(now.getTime());        //得到当前日期和时间
    g.setFont(f);
    g.setColor(Color.orange);
    g.drawString(time,70,25);
    }
}