Go语言视频零基础入门到精通

javalearner

程序运行图：


  
   
   
   

   
  

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.util.Calendar;
import java.util.Date;

/**
* 日历类, 提供日历功能
*/
public class MonthSelector extends JPanel implements ActionListener, MouseMotionListener, MouseListener
{
   final private String TITLES[] = {"星期日","星期一","星期二","星期三","星期四","星期五","星期六"};
   final private int ROW_HEIGHT = 20;
   final private int ROW_WIDTH = 40;

   private JTable table; // 表格
   private JLabel title; // 标题
   private JButton nextMonth; // 下个月份的按钮
   private JButton preMonth; // 上个月的按钮
   private JPanel top; // 顶部容器

   private int year; // 当前显示的年份
   private int month; // 当前显示的月份
   private int day; // 当前选择的日期
   private int week; // 当前选择的星期
   private int selectedX = -1;
   private int selectedY = -1;
   private int clickX = -1;
   private int clickY = -1;

public MonthSelector(){
   Calendar cal = Calendar.getInstance();
   cal.setTime(new Date());

   year = cal.get(Calendar.YEAR);
   month = cal.get(Calendar.MONTH)+1;
   day = cal.get(Calendar.DAY_OF_MONTH)-1;
   week = cal.get(Calendar.DAY_OF_WEEK)-1;

   top = new JPanel(new FlowLayout(FlowLayout.CENTER));
   table = new JTable(7,7);

   table.setPreferredSize(new Dimension(ROW_WIDTH * 7, ROW_HEIGHT * 7));
   table.setRowHeight(ROW_HEIGHT);
   for(int i=0; i<TITLES.length; i++)
   table.setValueAt(TITLES,0,i);

   title = new JLabel();
   nextMonth = new JButton(">>");
   preMonth = new JButton("<<");
   top.add(preMonth);
   top.add(title);
   top.add(nextMonth);
   setTitle();
   table.setEnabled(false);
   // 设置按钮
   setLayout(new BorderLayout());

   add(top, BorderLayout.NORTH);
   add(table, BorderLayout.CENTER);

   preMonth.addActionListener(this);
   nextMonth.addActionListener(this);

   showMonth(); // 设置显示当前月份
   table.setCellSelectionEnabled(true);

   table.addMouseMotionListener(this);
   table.addMouseListener(this);
  }

/**
* 取得指定年份和月份的日期数
* @return
*/
public int getDaysOfMonth(int year, int month)
{
   int Days[]= {31,28,31,30,31,30,31,31,30,31,30,31};
   // 判断是否闰年

   if( year % 400 == 0 || (year % 4 ==0 && year % 100 != 0)) // 说明是闰年
   Days[1] = 29;

   return Days[month-1];
  }

/**
* 取得指定月份的头一天的星期几
* @param month
* @return
*/
public int getWeekOfFirstDay(int year, int month){
   Calendar cal = Calendar.getInstance();
   cal.set(Calendar.YEAR, year);
   cal.set(Calendar.MONTH, month - 1);
   cal.set(Calendar.DAY_OF_MONTH, 1);

   int result = cal.get(Calendar.DAY_OF_WEEK) - 1;
   return result ;
  }

/**
* 设置显示的标题
*/
private void setTitle(){
   String m = String.valueOf(month);
   if(m.length() ==1) m = "0"+m;
   title.setText(String.valueOf(year)+"年"+m+"月");
}

/**
* 显示月份
*/
private void showMonth(){
   for(int x=0; x<7; x++)
   for(int y=1; y<7; y++) table.setValueAt("",y, x);

   int y = 1;
   int x = getWeekOfFirstDay(year, month);
   int maxDay = getDaysOfMonth(year,month);

   for(int i=0; i<maxDay; i++){
     table.setValueAt(new Integer(i+1),y,x);
     x ++;
    if(x>6){
            x=0;
            y++;
    }
   }
   repaint();
}

/**
* 处理按钮
* @param e
*/
public void actionPerformed(ActionEvent e){
    if(e.getSource().equals(nextMonth)){
      month++;
      if(month>12){
          month = 1;
          year++;
      }
    }

    if(e.getSource().equals(preMonth)){
      month--;
      if(month<1){
             month = 12;
             year --;
      }
    }

    setTitle();
    showMonth();
}

/**
* 绘制
* @param g
*/
public void paint(Graphics g){
    super.paint(g);

    // repaint Table First LINE
    g.fillRect(0,top.getHeight(), getWidth()-1, ROW_HEIGHT -1);
    g.setColor(Color.white);
    for(int i=0; i<7; i++)
    g.drawString((String)(table.getModel().getValueAt(0,i)),i*ROW_WIDTH, top.getHeight()+ ROW_HEIGHT - 3);

    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.YEAR, year);
    cal.set(Calendar.MONTH, month);
    cal.set(Calendar.DAY_OF_MONTH, day);
    int line = cal.get(Calendar.DAY_OF_WEEK_IN_MONTH) + 1;
    int x = week * table.getWidth() / 7;
    int y = top.getHeight() + ROW_HEIGHT * line ;
    g.setColor(Color.black);
    g.drawRect(x+1,y+1, ROW_WIDTH-4, ROW_HEIGHT-4);
    if(selectedX >= 0 && selectedY>= 0 && ! table.getModel().getValueAt(selectedY,selectedX).equals("")){
       g.setColor(Color.blue);
       g.drawRect(selectedX * ROW_WIDTH+1, (selectedY + 2) * ROW_HEIGHT -1 ,ROW_WIDTH-4,ROW_HEIGHT-4);
      }

    if(clickY >= 0 && clickX >= 0 & ! table.getModel().getValueAt(clickY,clickX).equals(""))
    {
      g.setColor(Color.green);
      g.drawRect(clickX * ROW_WIDTH+1, (clickY + 2) * ROW_HEIGHT -1 ,ROW_WIDTH-4,ROW_HEIGHT-4);
    }
}

public void mouseDragged(MouseEvent e){}

public void mouseMoved(MouseEvent e){
    if(e.getX()>0 && e.getY()<getWidth() && e.getY()> ROW_HEIGHT && e.getY()< ROW_HEIGHT * 7 )
     {
       selectedX = e.getX() / ROW_WIDTH;
       selectedY = e.getY() / ROW_HEIGHT;

       repaint();
     }
}

public void mouseClicked(MouseEvent e) {}

public void mousePressed(MouseEvent e){
    if(e.getX()>0 && e.getY()<getWidth() && e.getY()> ROW_HEIGHT && e.getY()< ROW_HEIGHT * 7 )
      {
        clickX = e.getX() / ROW_WIDTH;
        clickY = e.getY() / ROW_HEIGHT;

       repaint();
     }
}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}

/* --=[ 测试代码 ]=-- */
public static void main(String[] args){
    JFrame frm = new JFrame();
    frm.getContentPane().setLayout(new BorderLayout());
    frm.getContentPane().add(new MonthSelector());
    frm.pack();
    frm.show();
   }
}

  

  
  
   
   

     
   

     
   
  



源码下载：http://file.javaxxz.com/2014/9/30/214645578.zip