Java实现的日历功能完整示例

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.BevelBorder;
import javax.swing.border.SoftBevelBorder;
public class CalendarFrame extends JFrame implements ActionListener{
  /**
   * @author Nut
   * 2016.01.13
   */
  private static final long serialVersionUID = -7260798316896145633L;
  JLabel labelDay[] = new JLabel[42];
  JButton titleName[] = new JButton[7];
  String name[]={"日","一","二","三","四","五","六"};
  JButton nextMonth,previousMonth;
  JComboBox choiceYear,choiceMonth;
  Calendarbean calendar;
  JLabel showYear,showMonth;
  JLabel showmessage=new JLabel("",JLabel.CENTER);
  int year = 2011,month=2;
  //构造方法初始化界面
  public CalendarFrame(){
    JPanel pCenter = new JPanel();
    pCenter.setLayout(new GridLayout(7,7));
    //星期栏
    for(int i=0;i<7;i++){
      titleName[i]=new JButton(name[i]);
      titleName[i].setBorder(new SoftBevelBorder(BevelBorder.RAISED));
      pCenter.add(titleName[i]);
    }
    //日期栏
    for(int i=0;i<42;i++){
      labelDay[i]=new JLabel("",JLabel.CENTER);
      labelDay[i].setBorder(new SoftBevelBorder(BevelBorder.LOWERED));
      pCenter.add(labelDay[i]);
    }
    //年月选择栏
    choiceYear=new JComboBox();
    choiceMonth=new JComboBox();
    showYear=new JLabel("年");
    showMonth=new JLabel("月  ");
    for(int i=1990;i<2050;i++)
      choiceYear.addItem(i);
    choiceYear.addActionListener(this);
    for(int i=1;i<=12;i++)
      choiceMonth.addItem(i);
    choiceMonth.addActionListener(this);
    calendar=new Calendarbean();
    nextMonth=new JButton("下月");
    previousMonth=new JButton("上月");
    nextMonth.addActionListener(this);
    previousMonth.addActionListener(this);
    JPanel pNorth=new JPanel(),
    pSouth=new JPanel();
    pNorth.add(choiceYear);
    pNorth.add(showYear);
    pNorth.add(choiceMonth);
    pNorth.add(showMonth);
    pNorth.add(previousMonth);
    pNorth.add (nextMonth);
    pSouth.add(showmessage);
    add(pCenter,BorderLayout.CENTER);
    add(pNorth,BorderLayout.NORTH);
    add(pSouth,BorderLayout.SOUTH);
    setYearAndMonth(year,month);
    setDefaultCloseOperation(DISPOSE_ON_CLOSE);
  }
public void setYearAndMonth(int y,int m){
  calendar.setYear(y);
  calendar.setMonth(m);
  String day[]=calendar.getCalendar();
  for(int i=0;i<42;i++)
    labelDay[i].setText(day[i]);
  SimpleDateFormat df = new SimpleDateFormat("yyyy年MM月dd日 EEEE");//设置日期格式
  showmessage.setText("系统时间："+df.format(new Date()));
}
//事件动作
public void actionPerformed(ActionEvent e){
  if(e.getSource()==nextMonth){
    month=month +1;
    if(month>12)
      month=1;
    calendar.setMonth(month);
    choiceMonth.setSelectedItem(month);
    String day[]=calendar.getCalendar();
    for(int i=0;i<42;i++){
      labelDay[i].setText(day[i]);
    }
  }
  else if(e.getSource()==previousMonth){
    month=month-1;
    if(month<1)
      month=12;
    calendar.setMonth(month);
    choiceMonth.setSelectedItem(month);
    String day[]=calendar.getCalendar();
    for(int i=0;i<42;i++){
      labelDay[i].setText(day[i]);
    }
  }
  //选择年份
  else if (e.getSource()==choiceYear){
    calendar.setYear((Integer) choiceYear.getSelectedItem());
    String day[]=calendar.getCalendar();
    for(int i=0;i<42;i++){
      labelDay[i].setText(day[i]);
      }
    }
  //选择月份
  else if (e.getSource()==choiceMonth){
    calendar.setMonth((Integer) choiceMonth.getSelectedItem());
    String day[]=calendar.getCalendar();
    for(int i=0;i<42;i++){
        labelDay[i].setText(day[i]);
    }
  }
//  showmessage.setText("日历："+calendar.getYear()+"年"+calendar.getMonth()+"月");
}
}

import java.util.Calendar;
public class Calendarbean {
 String day[];
 int year = 2005,month=0;
 public void setYear(int year){
   this.year=year;
 }
 public int getYear(){
   return year;
 }
 public void setMonth(int month){
   this.month=month;
 }
 public int getMonth(){
   return month;
 }
 public String[] getCalendar(){
   String a[]=new String[42];
   Calendar 日历=Calendar.getInstance();
   日历.set(year,month-1,1);
   int 星期几=日历.get(Calendar.DAY_OF_WEEK)-1;
   int day=0;
   if (month==1||month==3||month==5||month==7||month==8||month==10||month==12)
     day=31;
   if(month==4||month==6||month==9||month==11)
     day=30;
   if(month==2){
     if(((year%4==0)&&(year%100!=0))||(year%400==0))
       day=29;
     else
       day=28;
   }
   for(int i=星期几,n=1;i<星期几+day;i++){
     a[i]=String.valueOf(n);
     n++;
   }
   return a;
 }
}

public class CalendarMainClass{
  public static void main(String args[])
  {
    CalendarFrame frame = new CalendarFrame();
    frame.setBounds(100,100,360,300);
    frame.setTitle("Java日历");
    frame.setVisible(true);
    frame.setYearAndMonth(1990,1);//设置日历初始值为1990年1月
  }
}