Java实现简单日历小程序 Java图形界面小日历开发

今天给大家介绍一下如何用Java swing开发一款简单的小日历，下面我们来看代码：
首先创建一个CalendarBean类，用于基本的日期计算：

package other1; 

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 date=Calendar.getInstance();
      date.set(year,month-1,1);
      int week=date.get(Calendar.DAY_OF_WEEK)-1;
      int day=0;   

      //判断大月份
      if(month==1||month==3||month==5||month==7
       ||month==8||month==10||month==12)
      {
        day=31;
      }   

      //判断小月
      if(month==4||month==6||month==9||month==11)
      {
        day=30;
      }   

      //判断平年与闰年
      if(month==2)
      {
        if(((year%4==0)&&(year%100!=0))||(year%400==0))
        {
          day=29;
        }   

        else
        {
          day=28;
        }
      }   

      for(int i=week,n=1;i<week+day;i++)
      {
          a[i]=String.valueOf(n) ;
          n++;
      }
      return a;
    }
}

然后再创建一个主界面类，用于界面的实现：

package other1; 

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;  

public class CalendarFrame extends JFrame implements ActionListener
{
    JLabel labelDay[]=new JLabel[42];
    JTextField text=new JTextField(10);
    JButton titleName[]=new JButton[7];
    JButton button = new JButton();
    String name[]={"日","一","二","三", "四","五","六"};
    JButton nextMonth,previousMonth;
    int year=1996,month=1; //启动程序显示的日期信息
    CalendarBean calendar;
    JLabel showMessage=new JLabel("",JLabel.CENTER);
    JLabel lbl1 = new JLabel("请输入年份：");
    JLabel lbl2=new JLabel("   ");  

    public CalendarFrame()
    {
    setBackground(new Color(0, 128, 128));
      JPanel pCenter=new JPanel();
      pCenter.setBackground(new Color(0, 139, 139)); 

     //将pCenter的布局设置为7行7列的GridLayout 布局。
      pCenter.setLayout(new GridLayout(7,7));   

     //pCenter添加组件titleName[i]
      for(int i=0;i<7;i++)
      {
        titleName[i]=new JButton(name[i]);
        pCenter.add(titleName[i]);
      }   

     //pCenter添加组件labelDay[i]
      for(int i=0;i<42;i++)
      {
        labelDay[i]=new JLabel("",JLabel.CENTER);
        pCenter.add(labelDay[i]);
      }   

      text.addActionListener(this);
      calendar=new CalendarBean();
      calendar.setYear(year);
      calendar.setMonth(month);
      String day[]=calendar.getCalendar();   

      for(int i=0;i<42;i++)
      {
        labelDay[i].setText(day[i]);
      }   

      nextMonth=new JButton("下月");
      previousMonth=new JButton("上月");
      button=new JButton("确定");  

      //注册监听器
      nextMonth.addActionListener(this);
      previousMonth.addActionListener(this);
      button.addActionListener(this);  

      JPanel pNorth=new JPanel(),
      pSouth=new JPanel();
      pNorth.add(showMessage);
      pNorth.add(lbl2);
      pNorth.add(previousMonth);
      pNorth.add(nextMonth);
      pSouth.add(lbl1);
      pSouth.add(text);
      pSouth.add(button);
      showMessage.setText("日历："+calendar.getYear()+"年"+ calendar.getMonth()+"月" );
      ScrollPane scrollPane=new ScrollPane();
      scrollPane.add(pCenter);
      getContentPane().add(scrollPane,BorderLayout.CENTER);// 窗口添加scrollPane在中心区域
      getContentPane().add(pNorth,BorderLayout.NORTH);// 窗口添加pNorth 在北面区域
      getContentPane().add(pSouth,BorderLayout.SOUTH);// 窗口添加pSouth 在南区域。  

    }   

    public void actionPerformed(ActionEvent e)
    {
      if(e.getSource()==nextMonth)
      {
        month=month+1;
        if(month>12)
        month=1;
        calendar.setMonth(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);
        String day[]=calendar.getCalendar();   

        for(int i=0;i<42;i++)
        {
          labelDay[i].setText(day[i]);
        }
       }
      else if(e.getSource()==button)
      {
        month=month+1;
        if(month>12)
           month=1;
        calendar.setYear(Integer.parseInt(text.getText()));
        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" );
    }
}

最后用一个类调用即可：

package other1; 

import javax.swing.JFrame;
import javax.swing.UIManager;  

public class CalendarMainClass
{
    public static void main(String args[])
    {
       try {
         UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); //windows界面风格
       }catch (Exception e) {
        e.printStackTrace();
       }
       CalendarFrame frame=new CalendarFrame();
       frame.setBounds(100,100,360,300);
       frame.setTitle("日历小程序");
       frame.setLocationRelativeTo(null);//窗体居中显示
       frame.setVisible(true);
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

运行结果如下：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。