swing 一个日期选择器

package give;

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.Stroke;
import java.awt.Toolkit;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Popup;
import javax.swing.PopupFactory;
import javax.swing.SwingUtilities;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;

/**
* @auther 卢帅印
* @date 2011-09-01
* 日期选择器，可以指定日期的显示格式
*/
public class DateChooser extends JPanel{

private static final long serialVersionUID = 4529266044762990227L;

private Date initDate;
private Calendar now=Calendar.getInstance();
private Calendar select;
private JPanel monthPanel;//月历
private JP1 jp1;//四块面板,组成
private JP2 jp2;
private JP3 jp3;
private JP4 jp4;
private Font font=new Font("宋体",Font.PLAIN,12);
private final LabelManager lm=new LabelManager();
private JLabel showDate; //,toSelect;
private SimpleDateFormat sdf;
private boolean isShow=false;
private Popup pop;

String dateStr;

/**
* Creates a new instance of DateChooser
*/
public DateChooser() {
this(new Date());
}
public DateChooser(Date date){
this(date, "yyyy年MM月dd日");
}
public DateChooser(String format){
this(new Date(), format);
}
public DateChooser(Date date, String format){
initDate=date;
sdf=new SimpleDateFormat(format);
select=Calendar.getInstance();
select.setTime(initDate);
initPanel();
initLabel();
}

/**
* 是否允许用户选择
*/
public void setEnabled(boolean b){
super.setEnabled(b);
showDate.setEnabled(b);
}

/**
*得到当前选择框的日期
*/
public Date getDate(){
return select.getTime();
}

//根据初始化的日期,初始化面板
private void initPanel(){
monthPanel=new JPanel(new BorderLayout());
monthPanel.setBorder(BorderFactory.createLineBorder(Color.BLUE));
JPanel up=new JPanel(new BorderLayout());
up.add(jp1=new JP1(),BorderLayout.NORTH);
up.add(jp2=new JP2(),BorderLayout.CENTER);
monthPanel.add(jp3=new JP3(),BorderLayout.CENTER);
monthPanel.add(up,BorderLayout.NORTH);
monthPanel.add(jp4=new JP4(),BorderLayout.SOUTH);
this.addAncestorListener(new AncestorListener(){
public void ancestorAdded(AncestorEvent event) {

}
public void ancestorRemoved(AncestorEvent event) {

}
//只要祖先组件一移动,马上就让popup消失
public void ancestorMoved(AncestorEvent event) {
hidePanel();
}
});
}
//初始化标签
private void initLabel(){
showDate=new JLabel(sdf.format(initDate));
showDate.setRequestFocusEnabled(true);
showDate.addMouseListener(new MouseAdapter(){
public void mousePressed(MouseEvent me){
showDate.requestFocusInWindow();
}
});
// toSelect=new JLabel(sdf.format(initDate));
// toSelect.setBorder(BorderFactory.createLineBorder(Color.BLACK));
// toSelect.setRequestFocusEnabled(true);
this.setBackground(Color.WHITE);
this.add(showDate,BorderLayout.CENTER);
// this.add(toSelect,BorderLayout.EAST);
this.setPreferredSize(new Dimension(90,25));
this.setBorder(BorderFactory.createLineBorder(Color.GRAY));
showDate.addMouseListener(new MouseAdapter(){
public void mouseEntered(MouseEvent me){
if(showDate.isEnabled()){
showDate.setCursor(new Cursor(Cursor.HAND_CURSOR));
showDate.setForeground(Color.RED);
}
}
public void mouseExited(MouseEvent me){
if(showDate.isEnabled()){
showDate.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
showDate.setForeground(Color.BLACK);
}
}
public void mousePressed(MouseEvent me){
if(showDate.isEnabled()){
showDate.setForeground(Color.CYAN);
if(isShow){
hidePanel();
}else{
showPanel(showDate);
}
}
}
public void mouseReleased(MouseEvent me){
if(showDate.isEnabled()){
showDate.setForeground(Color.BLACK);
}
}
});
showDate.addFocusListener(new FocusListener(){
public void focusLost(FocusEvent e){
hidePanel();
}
public void focusGained(FocusEvent e){

}
});
}
//根据新的日期刷新
private void refresh(){
jp1.updateDate();
jp3.updateDate();
SwingUtilities.updateComponentTreeUI(this);
}
//提交日期
private void commit(){
System.out.println("选中的日期是："+sdf.format(select.getTime()));
showDate.setText(sdf.format(select.getTime()));

dateStr=sdf.format(select.getTime());

hidePanel();
}
//隐藏日期选择面板
private void hidePanel(){
if(pop!=null){
isShow=false;
pop.hide();
pop=null;
}
}
//显示日期选择面板
private void showPanel(Component owner){
if(pop!=null){
pop.hide();
}
Point show=new Point(0,showDate.getHeight());
SwingUtilities.convertPointToScreen(show,showDate);
Dimension size=Toolkit.getDefaultToolkit().getScreenSize();
int x=show.x;
int y=show.y;
if(x<0){
x=0;
}
if(x>size.width-295){
x=size.width-295;
}
if(y<size.height-170){
}else{
y-=188;
}
pop=PopupFactory.getSharedInstance().getPopup(owner,monthPanel,x,y);
pop.show();
isShow=true;
}
/**
* 最上面的面板用来显示月份的增减
*/
private class JP1 extends JPanel{
JLabel yearleft,yearright,monthleft,monthright,center,centercontainer;
public JP1(){
super(new BorderLayout());
this.setBackground(new Color(160,185,215));
initJP1();
}
private void initJP1(){
yearleft=new JLabel(" <<",JLabel.CENTER);
yearleft.setToolTipText("上一年");
yearright=new JLabel(">> ",JLabel.CENTER);
yearright.setToolTipText("下一年");
yearleft.setBorder(BorderFactory.createEmptyBorder(2,0,0,0));
yearright.setBorder(BorderFactory.createEmptyBorder(2,0,0,0));

monthleft=new JLabel(" <", JLabel.RIGHT);
monthleft.setToolTipText("上一月");
monthright=new JLabel("> ", JLabel.LEFT);
monthright.setToolTipText("下一月");
monthleft.setBorder(BorderFactory.createEmptyBorder(2,30,0,0));
monthright.setBorder(BorderFactory.createEmptyBorder(2,0,0,30));

centercontainer=new JLabel("", JLabel.CENTER);
centercontainer.setLayout(new BorderLayout());
center=new JLabel("", JLabel.CENTER);

centercontainer.add(monthleft,BorderLayout.WEST);
centercontainer.add(center,BorderLayout.CENTER);
centercontainer.add(monthright,BorderLayout.EAST);

this.add(yearleft,BorderLayout.WEST);
this.add(centercontainer,BorderLayout.CENTER);
this.add(yearright,BorderLayout.EAST);
this.setPreferredSize(new Dimension(295,25));

updateDate();

yearleft.addMouseListener(new MouseAdapter(){
public void mouseEntered(MouseEvent me){
yearleft.setCursor(new Cursor(Cursor.HAND_CURSOR));
yearleft.setForeground(Color.RED);
}
public void mouseExited(MouseEvent me){
yearleft.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
yearleft.setForeground(Color.BLACK);
}
public void mousePressed(MouseEvent me){
select.add(Calendar.YEAR,-1);
yearleft.setForeground(Color.WHITE);
refresh();
}
public void mouseReleased(MouseEvent me){
yearleft.setForeground(Color.BLACK);
}
});
yearright.addMouseListener(new MouseAdapter(){
public void mouseEntered(MouseEvent me){
yearright.setCursor(new Cursor(Cursor.HAND_CURSOR));
yearright.setForeground(Color.RED);
}
public void mouseExited(MouseEvent me){
yearright.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
yearright.setForeground(Color.BLACK);
}
public void mousePressed(MouseEvent me){
select.add(Calendar.YEAR,1);
yearright.setForeground(Color.WHITE);
refresh();
}
public void mouseReleased(MouseEvent me){
yearright.setForeground(Color.BLACK);
}
});
monthleft.addMouseListener(new MouseAdapter(){
public void mouseEntered(MouseEvent me){
monthleft.setCursor(new Cursor(Cursor.HAND_CURSOR));
monthleft.setForeground(Color.RED);
}
public void mouseExited(MouseEvent me){
monthleft.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
monthleft.setForeground(Color.BLACK);
}
public void mousePressed(MouseEvent me){
select.add(Calendar.MONTH,-1);
monthleft.setForeground(Color.WHITE);
refresh();
}
public void mouseReleased(MouseEvent me){
monthleft.setForeground(Color.BLACK);
}
});
monthright.addMouseListener(new MouseAdapter(){
public void mouseEntered(MouseEvent me){
monthright.setCursor(new Cursor(Cursor.HAND_CURSOR));
monthright.setForeground(Color.RED);
}
public void mouseExited(MouseEvent me){
monthright.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
monthright.setForeground(Color.BLACK);
}
public void mousePressed(MouseEvent me){
select.add(Calendar.MONTH,1);
monthright.setForeground(Color.WHITE);
refresh();
}
public void mouseReleased(MouseEvent me){
monthright.setForeground(Color.BLACK);
}
});
}
private void updateDate(){
center.setText(select.get(Calendar.YEAR)+"年"+(select.get(Calendar.MONTH)+1)+"月");
}
}
private class JP2 extends JPanel{
public JP2(){
this.setPreferredSize(new Dimension(295,20));
}
protected void paintComponent(Graphics g){
g.setFont(font);
g.drawString("星期日 星期一 星期二 星期三 星期四 星期五 星期六",5,10);
g.drawLine(0,15,getWidth(),15);
}
}
private class JP3 extends JPanel{
public JP3(){
super(new GridLayout(6,7));
this.setPreferredSize(new Dimension(295,100));
initJP3();
}
private void initJP3(){
updateDate();
}
public void updateDate(){
this.removeAll();
lm.clear();
Date temp=select.getTime();
Calendar select=Calendar.getInstance();
select.setTime(temp);
select.set(Calendar.DAY_OF_MONTH,1);
int index=select.get(Calendar.DAY_OF_WEEK);
int sum=(index==1?8:index);
select.add(Calendar.DAY_OF_MONTH,0-sum);
for(int i=0;i<42;i++){
select.add(Calendar.DAY_OF_MONTH,1);
lm.addLabel(new MyLabel(select.get(Calendar.YEAR),
select.get(Calendar.MONTH),select.get(Calendar.DAY_OF_MONTH)));
}
for(MyLabel my:lm.getLabels()){
this.add(my);
}
select.setTime(temp);
}
}
private class MyLabel extends JLabel implements Comparator<MyLabel>,
MouseListener,MouseMotionListener{
private int year,month,day;
private boolean isSelected;
public MyLabel(int year,int month,int day){
super(""+day,JLabel.CENTER);
this.year=year;
this.day=day;
this.month=month;
this.addMouseListener(this);
this.addMouseMotionListener(this);
this.setFont(font);
if(month==select.get(Calendar.MONTH)){
this.setForeground(Color.BLACK);
}else{
this.setForeground(Color.LIGHT_GRAY);
}
if(day==select.get(Calendar.DAY_OF_MONTH)){
this.setBackground(new Color(160,185,215));
}else{
this.setBackground(Color.WHITE);
}
}
public boolean getIsSelected(){
return isSelected;
}
public void setSelected(boolean b,boolean isDrag){
isSelected=b;
if(b&&!isDrag){
int temp=select.get(Calendar.MONTH);
select.set(year,month,day);
if(temp==month){
SwingUtilities.updateComponentTreeUI(jp3);
}else{
refresh();
}
}
this.repaint();
}
protected void paintComponent(Graphics g){
if(day==select.get(Calendar.DAY_OF_MONTH)&&
month==select.get(Calendar.MONTH)){
//如果当前日期是选择日期,则高亮显示
g.setColor(new Color(160,185,215));
g.fillRect(0,0,getWidth(),getHeight());
}
if(year==now.get(Calendar.YEAR)&&
month==now.get(Calendar.MONTH)&&
day==now.get(Calendar.DAY_OF_MONTH)){
//如果日期和当前日期一样,则用红框
Graphics2D gd=(Graphics2D)g;
gd.setColor(Color.RED);
Polygon p=new Polygon();
p.addPoint(0,0);
p.addPoint(getWidth()-1,0);
p.addPoint(getWidth()-1,getHeight()-1);
p.addPoint(0,getHeight()-1);
gd.drawPolygon(p);
}
if(isSelected){//如果被选中了就画出一个虚线框出来
Stroke s=new BasicStroke(1.0f,BasicStroke.CAP_SQUARE,
BasicStroke.JOIN_BEVEL,1.0f,new float[]{2.0f,2.0f},1.0f);
Graphics2D gd=(Graphics2D)g;
gd.setStroke(s);
gd.setColor(Color.BLACK);
Polygon p=new Polygon();
p.addPoint(0,0);
p.addPoint(getWidth()-1,0);
p.addPoint(getWidth()-1,getHeight()-1);
p.addPoint(0,getHeight()-1);
gd.drawPolygon(p);
}
super.paintComponent(g);
}
public boolean contains(Point p){
return this.getBounds().contains(p);
}
private void update(){
repaint();
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
isSelected=true;
update();
}
public void mouseReleased(MouseEvent e) {
Point p=SwingUtilities.convertPoint(this,e.getPoint(),jp3);
lm.setSelect(p,false);
commit();
}
public void mouseEntered(MouseEvent e) {
}

public void mouseExited(MouseEvent e) {
}
public void mouseDragged(MouseEvent e) {
Point p=SwingUtilities.convertPoint(this,e.getPoint(),jp3);
lm.setSelect(p,true);
}
public void mouseMoved(MouseEvent e) {
}
public int compare(MyLabel o1, MyLabel o2) {
Calendar c1=Calendar.getInstance();
c1.set(o1.year,o2.month,o1.day);
Calendar c2=Calendar.getInstance();
c2.set(o2.year,o2.month,o2.day);
return c1.compareTo(c2);
}
}
private class LabelManager{
private List<MyLabel> list;
public LabelManager(){
list=new ArrayList<MyLabel>();
}
public List<MyLabel> getLabels(){
return list;
}
public void addLabel(MyLabel my){
list.add(my);
}
public void clear(){
list.clear();
}
public void setSelect(MyLabel my, boolean b){
for(MyLabel m:list){
if(m.equals(my)){
m.setSelected(true,b);
}else{
m.setSelected(false,b);
}
}
}
public void setSelect(Point p, boolean b){
//如果是拖动,则要优化一下,以提高效率
if(b){
//表示是否能返回,不用比较完所有的标签,能返回的标志就是把上一个标签和
//将要显示的标签找到了就可以了
boolean findPrevious=false,findNext=false;
for(MyLabel m:list){
if(m.contains(p)){
findNext=true;
if(m.getIsSelected()){
findPrevious=true;
}else{
m.setSelected(true,b);
}
}else if(m.getIsSelected()){
findPrevious=true;
m.setSelected(false,b);
}
if(findPrevious&&findNext){
return;
}
}
}else{
MyLabel temp=null;
for(MyLabel m:list){
if(m.contains(p)){
temp=m;
}else if(m.getIsSelected()){
m.setSelected(false,b);
}
}
if(temp!=null){
temp.setSelected(true,b);
}
}
}

}
private class JP4 extends JPanel{
public JP4(){
super(new BorderLayout());
this.setPreferredSize(new Dimension(295,20));
this.setBackground(new Color(160,185,215));
SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日");

dateStr="今天: "+sdf.format(new Date());


final JLabel jl=new JLabel("今天: "+sdf.format(new Date()));
jl.setToolTipText("点击选择今天日期");
this.add(jl,BorderLayout.CENTER);
jl.addMouseListener(new MouseAdapter(){
public void mouseEntered(MouseEvent me){
jl.setCursor(new Cursor(Cursor.HAND_CURSOR));
jl.setForeground(Color.RED);
}
public void mouseExited(MouseEvent me){
jl.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
jl.setForeground(Color.BLACK);
}
public void mousePressed(MouseEvent me){
jl.setForeground(Color.WHITE);
select.setTime(new Date());
refresh();
commit();
}
public void mouseReleased(MouseEvent me){
jl.setForeground(Color.BLACK);
}
});
}
}

public static void main(String[] args) {
final DateChooser mp = new DateChooser("yyyy-MM-dd");
JFrame jf = new JFrame("测试日期选择器");
jf.add(mp, BorderLayout.CENTER);
jf.add(new JButton("测试用的"),BorderLayout.NORTH);
jf.pack();
jf.setLocationRelativeTo(null);
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

//////////////////////////////使用方法///////////////////////////////////

在其他窗口中，比如new出来的frame，可以先声明DateChooser mp;

在构造函数中实例化它；

在事件中可以获取它的值的方法，例如：

private void jButton0MouseMouseClicked(MouseEvent event) {
//获取dateChooser的值通过获取实例的dateStr(它在实例每次改变后也跟着改变)
//我没通过调用此组件的系统方法去获取值，目前找不到方法，这样更简单
String value=mp.dateStr;

System.out.println("value change:"+value);
jTextField1.setText(value);
}

////这样mp.dateStr就是每次获取日期的值，你想拿它来做什么都可以