monthselector.java

计算器,表 格等很多功能就在这里,的确是这样的.

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[i],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){} 


public static void main(String[] args){ 
   MonthSelector month=new MonthSelector();
   JFrame frm = new JFrame(); 
   
   frm.getContentPane().setLayout(new BorderLayout()); 
   frm.getContentPane().add(new MonthSelector()); 
   frm.pack(); 
   frm.show(); 
  } 

}