背景：
最近在做个Java程序，用来做客户端，使用Swing来开发，界面需要选择一个月份，这个时候使用日期选择器就很蹩脚，不太好应用，网上搜了一会儿找不到合适的拿来直接用，所以在其中一个博客上面找到一个DateChooser的类进行修改，用于进行月份选择；修改后可以拿来使用，对于业务的场景使用OK了，后续比如增加月份选择后再选择等操作还没有实现，后续有空再增加，另外还有部分不再使用的代码还没空删除，有需要的可以参照代码，代码如下：
package my.contacteditor;
/**
* @date 2018-11-21
*/
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.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
/**
* 月份选择器，选择相应的月份
*/
public class MonthChooser extends JPanel{
private static final long serialVersionUID = 4529266044762990227L;
private Date initDate;
private Calendar now=Calendar.getInstance();
private Calendar select;
private Date selectDate;
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;
/**
* Creates a new instance of DateChooser
*/
public MonthChooser() {
this(new Date());
}
public MonthChooser(Date date){
this(date, "yyyy年MM月");
}
public MonthChooser(String format){
this(new Date(), format);
}
public MonthChooser(Date date, String format){
initDate=date;
selectDate = date;
sdf=new SimpleDateFormat(format);
select=Calendar.getInstance();
select.setTime(initDate);
initPanel();
initLabel();
}
public void resetDate() {
select.setTime(new Date());
refresh();
}
/**
* 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();
}
});
this.setBackground(Color.WHITE);
this.add(showDate,BorderLayout.CENTER);
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()));
selectDate = 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,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));
centercontainer=new JLabel("", JLabel.CENTER);
centercontainer.setLayout(new BorderLayout());
center=new JLabel("", JLabel.CENTER);
centercontainer.add(center,BorderLayout.CENTER);
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);
}
});
}
private void updateDate(){
center.setText(select.get(Calendar.YEAR)+"年");
}
}
private class JP2 extends JPanel{
public JP2(){
this.setPreferredSize(new Dimension(295,20));
}
protected void paintComponent(Graphics g){
g.setFont(font);
g.drawString("月份一 月份二 月份三 月份四 月份五 月份六",5,10);
g.drawLine(0,15,getWidth(),15);
}
}
private class JP3 extends JPanel{
public JP3(){
super(new GridLayout(3,4));
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);
Calendar show=Calendar.getInstance();
show.set(Calendar.DAY_OF_MONTH,1);
show.set(Calendar.YEAR,select.get(Calendar.YEAR));
show.set(Calendar.MONTH,0);
for(int i=0;i<12;i++){
lm.addLabel(new MyLabel(show.get(Calendar.YEAR),
show.get(Calendar.MONTH)));
show.add(Calendar.MONTH,1);
}
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;
private boolean isSelected;
public MyLabel(int year,int month){
super(""+(month+1)+"月",JLabel.CENTER);
this.year=year;
this.month=month;
this.addMouseListener(this);
this.addMouseMotionListener(this);
this.setFont(font);
if(year==select.get(Calendar.YEAR)){
this.setForeground(Color.BLACK);
}else{
this.setForeground(Color.LIGHT_GRAY);
}
if(month==select.get(Calendar.MONTH) && year == select.get(Calendar.YEAR)){
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,1);
if(temp==month){
SwingUtilities.updateComponentTreeUI(jp3);
}else{
refresh();
}
}
this.repaint();
}
protected void paintComponent(Graphics g){
Calendar sd = Calendar.getInstance();
sd.setTime(selectDate);
if(year==sd.get(Calendar.YEAR) && month==sd.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)){
//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,1);
Calendar c2=Calendar.getInstance();
c2.set(o2.year,o2.month,1);
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");
final JLabel jl=new JLabel("本月: "+sdf.format(new Date()));
jl.setToolTipText("点击选择本月");
jl.setHorizontalAlignment(SwingConstants.CENTER);
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 MonthChooser mp = new MonthChooser("yyyy年MM月");
JFrame jf = new JFrame("测试月份选择器");
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);
}
}