How to implement a custom date picker in Java

The date picker is a function that we often use in daily development. The following article mainly introduces you to the relevant information about using java to implement a custom date picker. The article gives detailed sample code. Friends who need it can refer to it. Let’s learn with the editor below.

Preface

This article mainly introduces a date picker written using java swing. Swing is a GUI tool designed for Java Package, Swing is part of the JAVA basic class. Swing includes graphical user interface (GUI) devices such as: text boxes, buttons, separated panes and tables. I won’t say much below, let’s take a look at the detailed introduction.

First the renderings

##The code is as follows:

package com.jianggujin;

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;

/**
 * 日期选择器控件
 * 
 * @author jianggujin
 * 
 */
@SuppressWarnings("serial")
public final class JDateChooser extends JDialog
{

 // 定义相关参数
 /**
 * 年份
 */
 private int year = 0;
 /**
 * 月份
 */
 private int month = 0;
 /**
 * 天
 */
 private int date = 0;

 /**
 * 日期选择背景色
 */
 private Color selectColor = Color.green;
 /**
 * 日期背景色
 */
 private Color dateColor = Color.white;
 /**
 * 日期鼠标进入背景色
 */
 private Color dateHoverColor = Color.lightGray;
 /**
 * 日期标题背景色
 */
 private Color dateTitleColor = Color.gray;
 /**
 * 日期标题字体颜色
 */
 private Color dateTitleFontColor = Color.black;
 /**
 * 日期字体颜色
 */
 private Color dateFontColor = Color.black;

 /**
 * 日期是否有效标志
 */
 private boolean flag = false;

 /**
 * 最小年份
 */
 private int minYear = 1900;
 /**
 * 最大年份
 */
 private int maxYear = 2050;

 // 定义所需组件
 /**
 * 上一年
 */
 private JButton jbYearPre;
 /**
 * 下一年
 */
 private JButton jbYearNext;
 /**
 * 上一月
 */
 private JButton jbMonthPre;
 /**
 * 下一月
 */
 private JButton jbMonthNext;
 /**
 * 年份下拉选择框
 */
 private JComboBox<String> jcbYear;
 /**
 * 月份下拉选择框
 */
 private JComboBox<String> jcbMonth;
 /**
 * 天标签
 */
 private JLabel[][] jlDays;
 /**
 * 选择
 */
 private JButton jbChoose;
 /**
 * 今日
 */
 private JButton jbToday;
 /**
 * 取消
 */
 private JButton jbCancel;

 /**
 * 程序主方法
 * 
 * @param args
 *   命令参数
 */
 public static void main(String[] args)
 {
  try
  {
   UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
  }
  catch (Exception e)
  {
  }
  JDateChooser gg = new JDateChooser();
  gg.showDateChooser();
  System.out.println(gg.getDateFormat("yyyy-MM-dd"));
 }

 /**
 * 显示对话框
 */
 public void showDateChooser()
 {
  setVisible(true);
 }

 /**
 * 关闭对话框
 */
 public void closeDateChooser()
 {
  this.dispose();
 }

 /**
 * 设置时间
 * 
 * @param year
 *   年份 1900-2050
 * @param month
 *   月份 1-12
 * @param date
 *   天
 */
 public void setDate(int year, int month, int date)
 {
  if (year >= minYear && year <= maxYear)
  {
   this.year = year;
  }
  else
  {
   return;
  }
  if (month >= 1 && month <= 12)
  {
   this.month = month;
  }
  else
  {
   return;
  }
  if (date > 0 && date <= getDaysInMonth(year, month))
  {
   this.date = date;
  }
  else
  {
   return;
  }
 }

 /**
 * 获得用户操作是否有效标志
 * 
 * @return 事件是否有效
 */
 public boolean getFlag()
 {
  return flag;
 }

 /**
 * 构造方法
 */
 public JDateChooser()
 {
  initComponent();
  initComponentData();
  addComponent();
  addListener();
  setDialogAttribute();
 }

 /**
 * 实例化组件
 */
 private void initComponent()
 {
  jbYearPre = new JButton();
  jbYearNext = new JButton();
  jbMonthPre = new JButton();
  jbMonthNext = new JButton();
  jcbYear = new JComboBox<String>();
  jcbMonth = new JComboBox<String>();

  jlDays = new JLabel[7][7];

  jbChoose = new JButton();
  jbToday = new JButton();
  jbCancel = new JButton();
 }

 /**
 * 初始化组件数据
 */
 private void initComponentData()
 {
  jbYearPre.setText("←");
  jbYearNext.setText("→");
  jbMonthPre.setText("↑");
  jbMonthNext.setText("↓");
  Calendar calendar = Calendar.getInstance();
  if (year != 0 && month != 0 && date != 0)
  {
   calendar.set(year, month - 1, date);
  }
  else
  {
   year = calendar.get(Calendar.YEAR);
   month = calendar.get(Calendar.MONTH) + 1;
   date = calendar.get(Calendar.DAY_OF_MONTH);
  }
  initYear();
  jcbYear.setSelectedItem(year + "年");
  for (int i = 1; i <= 12; i++)
  {
   jcbMonth.addItem(i + "月");
  }
  jcbMonth.setSelectedItem(month + "月");
  for (int i = 0; i < 7; i++)
  {
   JLabel temp = new JLabel();
   temp.setHorizontalAlignment(JLabel.CENTER);
   temp.setVerticalAlignment(JLabel.CENTER);
   temp.setOpaque(true);
   temp.setBackground(dateTitleColor);
   temp.setForeground(dateTitleFontColor);
   jlDays[0][i] = temp;
  }
  for (int i = 1; i < 7; i++)
  {
   for (int j = 0; j < 7; j++)
   {
   JLabel temp = new JLabel();
   temp.setHorizontalAlignment(JLabel.CENTER);
   temp.setVerticalAlignment(JLabel.CENTER);
   temp.setOpaque(true);
   temp.setForeground(dateFontColor);
   jlDays[i][j] = temp;
   }
  }

  String[] days = { "日", "一", "二", "三", "四", "五", "六" };
  for (int i = 0; i < 7; i++)
  {
   jlDays[0][i].setText(days[i]);
  }

  jbChoose.setText("选择");
  jbToday.setText("今日");
  jbCancel.setText("取消");

  changeDate();
 }

 /**
 * 初始化显示年份范围
 */
 private void initYear()
 {
  jcbYear.removeAllItems();
  for (int i = minYear; i <= maxYear; i++)
  {
   jcbYear.addItem(i + "年");
  }
 }

 /**
 * 添加组件
 */
 private void addComponent()
 {
  // 添加背部组件
  JPanel north = new JPanel();
  north.add(jbYearPre);
  north.add(jbMonthPre);
  north.add(jcbYear);
  north.add(jcbMonth);
  north.add(jbMonthNext);
  north.add(jbYearNext);
  this.add(north, "North");

  // 添加中间组件
  JPanel center = new JPanel(new GridLayout(7, 7));
  for (int i = 0; i < 7; i++)
  {
   for (int j = 0; j < 7; j++)
   {
   center.add(jlDays[i][j]);
   }
  }
  this.add(center);

  // 添加南部组件
  JPanel jpSouth = new JPanel();
  jpSouth.add(jbChoose);
  jpSouth.add(jbToday);
  jpSouth.add(jbCancel);
  this.add(jpSouth, "South");
 }

 /**
 * 获得指定年指定月份的天数
 * 
 * @param year
 *   年份
 * @param month
 *   月份
 * @return 天数
 */
 private int getDaysInMonth(int year, int month)
 {
  switch (month)
  {
  case 1:
  case 3:
  case 5:
  case 7:
  case 8:
  case 10:
  case 12:
   return 31;
  case 4:
  case 6:
  case 9:
  case 11:
   return 30;
  case 2:
   if (isLeapYear(year))
   {
   return 29;
   }
   return 28;
  default:
   return 0;
  }
 }

 /**
 * 清空日期
 */
 private void clearDate()
 {
  for (int i = 1; i < 7; i++)
  {
   for (int j = 0; j < 7; j++)
   {
   jlDays[i][j].setText("");
   }
  }
 }

 /**
 * 更改日期
 * 
 */
 private void changeDate()
 {
  refreshLabelColor();
  clearDate();
  Calendar calendar = Calendar.getInstance();
  calendar.set(year, month - 1, 1);
  int day_in_week = calendar.get(Calendar.DAY_OF_WEEK);
  int days = getDaysInMonth(year, month);
  if (date > days)
  {
   date = 1;
  }
  int temp = 0;
  for (int i = day_in_week - 1; i < 7; i++)
  {
   temp++;
   jlDays[1][i].setText(temp + "");
   if (temp == date)
   {
   jlDays[1][i].setBackground(selectColor);
   }
  }
  for (int i = 2; i < 7; i++)
  {
   for (int j = 0; j < 7; j++)
   {
   temp++;
   if (temp > days)
   {
    return;
   }
   jlDays[i][j].setText(temp + "");
   if (temp == date)
   {
    jlDays[i][j].setBackground(selectColor);
   }
   }
  }
 }

 /**
 * 添加监听
 */
 private void addListener()
 {
  LabelMouseListener labelMouseListener = new LabelMouseListener();
  for (int i = 1; i < 7; i++)
  {
   for (int j = 0; j < 7; j++)
   {
   jlDays[i][j].addMouseListener(labelMouseListener);
   }
  }
  ButtonActionListener buttonActionListener = new ButtonActionListener();
  jbYearPre.addActionListener(buttonActionListener);
  jbYearNext.addActionListener(buttonActionListener);
  jbMonthPre.addActionListener(buttonActionListener);
  jbMonthNext.addActionListener(buttonActionListener);
  jbChoose.addActionListener(buttonActionListener);
  jbToday.addActionListener(buttonActionListener);
  jbCancel.addActionListener(buttonActionListener);

  ComboBoxItemListener comboBoxItemListener = new ComboBoxItemListener();
  jcbYear.addItemListener(comboBoxItemListener);
  jcbMonth.addItemListener(comboBoxItemListener);
 }

 /**
 * 解析年份或月份
 * 
 * @param yearOrMonth
 *   年份或月份字符串
 * @return 年份或月份
 */
 private int parseYearOrMonth(String yearOrMonth)
 {
  return Integer.parseInt(yearOrMonth.substring(0, yearOrMonth.length() - 1));
 }

 /**
 * 判断是否为闰年
 * 
 * @param year
 *   年份
 * @return true 闰年<br/>
 *   false 平年
 */
 private boolean isLeapYear(int year)
 {
  return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
 }

 /**
 * 设置对话框属性
 */
 private void setDialogAttribute()
 {
  this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
  this.setSize(400, 300);
  this.setLocationRelativeTo(null);
  // 显示为模态对话框
  this.setModal(true);
  this.setTitle("日期选择器");
  this.setIconImage((new ImageIcon(this.getClass().getResource("/calendar.png"))).getImage());
 }

 /**
 * 刷新日期标签背景颜色
 */
 private void refreshLabelColor()
 {
  for (int i = 1; i < 7; i++)
  {
   for (int j = 0; j < 7; j++)
   {
   jlDays[i][j].setBackground(dateColor);
   }
  }
 }

 /**
 * 获得显示最小年份
 * 
 * @return 显示最小年份
 */
 public int getMinYear()
 {
  return minYear;
 }

 /**
 * 获得显示最大年份
 * 
 * @return 显示最大年份
 */
 public int getMaxYear()
 {
  return maxYear;
 }

 /**
 * 设置显示最小年份和最大年份(1900-9999)
 * 
 * @param minYear
 *   最小年份
 * @param maxYear
 *   最大年份
 */
 public void setMinAndMaxYear(int minYear, int maxYear)
 {
  if (minYear > maxYear || minYear < 1900 || maxYear > 9999)
  {
   return;
  }
  this.minYear = minYear;
  this.maxYear = maxYear;
  initYear();
 }

 /**
 * 获得选中背景颜色
 * 
 * @return 选中背景颜色
 */
 public Color getSelectColor()
 {
  return selectColor;
 }

 /**
 * 设置选中背景颜色
 * 
 * @param selectColor
 *   选中背景颜色
 */
 public void setSelectColor(Color selectColor)
 {
  this.selectColor = selectColor;
 }

 /**
 * 获得日期背景颜色
 * 
 * @return 日期背景颜色
 */
 public Color getDateColor()
 {
  return dateColor;
 }

 /**
 * 设置日期背景颜色
 * 
 * @param dateColor
 *   日期背景颜色
 */
 public void setDateColor(Color dateColor)
 {
  this.dateColor = dateColor;
 }

 /**
 * 获得日期鼠标进入背景颜色
 * 
 * @return 日期鼠标进入背景颜色
 */
 public Color getDetaHoverColor()
 {
  return dateHoverColor;
 }

 /**
 * 设置日期鼠标进入背景颜色
 * 
 * @param dateHoverColor
 *   日期鼠标进入背景颜色
 */
 public void setDateHoverColor(Color dateHoverColor)
 {
  this.dateHoverColor = dateHoverColor;
 }

 /**
 * 获得日期标题背景颜色
 * 
 * @return 日期标题背景颜色
 */
 public Color getDateTitleColor()
 {
  return dateTitleColor;
 }

 /**
 * 设置日期标题背景颜色
 * 
 * @param dateTitleColor
 *   日期标题背景颜色
 */
 public void setDateTitleColor(Color dateTitleColor)
 {
  this.dateTitleColor = dateTitleColor;
 }

 /**
 * 获得日期标题字体颜色
 * 
 * @return 日期标题字体颜色
 */
 public Color getDateTitleFontColor()
 {
  return dateTitleFontColor;
 }

 /**
 * 设置日期标题字体颜色
 * 
 * @param dateTitleFontColor
 *   日期标题字体颜色
 */
 public void setDateTitleFontColor(Color dateTitleFontColor)
 {
  this.dateTitleFontColor = dateTitleFontColor;
 }

 /**
 * 获得日期字体颜色
 * 
 * @return 日期字体颜色
 */
 public Color getDateFontColor()
 {
  return dateFontColor;
 }

 /**
 * 设置日期字体颜色
 * 
 * @param dateFontColor
 *   日期字体颜色
 */
 public void setDateFontColor(Color dateFontColor)
 {
  this.dateFontColor = dateFontColor;
 }

 /**
 * 获得选择年份
 * 
 * @return 选择年份
 */
 public int getYear()
 {
  return year;
 }

 /**
 * 获得选中月份
 * 
 * @return 选中月份
 */
 public int getMonth()
 {
  return month;
 }

 /**
 * 获得选中天为当月第几天
 * 
 * @return 选中天为当月第几天
 */
 public int getDate()
 {
  return date;
 }

 /**
 * 获得选中天为一周中第几天
 * 
 * @return 选中天为一周中第几天
 */
 public int getDayOfWeek()
 {
  return getCalendar().get(Calendar.DAY_OF_WEEK);
 }

 /**
 * 获得选中天为一年中第几天
 * 
 * @return 选中天为一年中第几天
 */
 public int getDayOfYear()
 {
  return getCalendar().get(Calendar.DAY_OF_YEAR);
 }

 /**
 * 获得日期对象
 * 
 * @return 日期对象
 */
 public Date getDateObject()
 {
  return getCalendar().getTime();
 }

 /**
 * 获得以指定规则格式化的日期字符串
 * 
 * @param format
 *   格式化规则
 * @return 日期字符串
 */
 public String getDateFormat(String format)
 {
  return new SimpleDateFormat(format).format(getDateObject());
 }

 /**
 * 获得Calendar对象
 * 
 * @return Calendar对象
 */
 private Calendar getCalendar()
 {
  Calendar calendar = Calendar.getInstance();
  calendar.set(year, month - 1, date);
  return calendar;
 }

 /**
 * 标签鼠标监听
 * 
 * @author jianggujin
 * 
 */
 final class LabelMouseListener extends MouseAdapter
 {

  @Override
  public void mouseClicked(MouseEvent e)
  {
   JLabel temp = (JLabel) e.getSource();
   if (!temp.getText().equals(""))
   {
   int date = Integer.parseInt(temp.getText());
   {
    if (date != JDateChooser.this.date)
    {
     JDateChooser.this.date = date;
     refreshLabelColor();
     temp.setBackground(selectColor);
    }
   }
   }
  }

  @Override
  public void mouseEntered(MouseEvent e)
  {
   JLabel temp = (JLabel) e.getSource();
   if (!temp.getText().equals(""))
   {
   temp.setBackground(dateHoverColor);
   }
  }

  @Override
  public void mouseExited(MouseEvent e)
  {
   JLabel temp = (JLabel) e.getSource();
   if (!temp.getText().equals(""))
   {
   if (Integer.parseInt(temp.getText()) != date)
   {
    temp.setBackground(dateColor);
   }
   else
   {
    temp.setBackground(selectColor);
   }
   }
  }

 }

 /**
 * 按钮动作监听
 * 
 * @author jianggujin
 * 
 */
 final class ButtonActionListener implements ActionListener
 {

  public void actionPerformed(ActionEvent e)
  {
   if (e.getSource() == jbYearPre)
   {
   int select = jcbYear.getSelectedIndex();
   if (select > 0)
   {
    jcbYear.setSelectedIndex(select - 1);
   }
   }
   else if (e.getSource() == jbYearNext)
   {
   int select = jcbYear.getSelectedIndex();
   if (select < jcbYear.getItemCount() - 1)
   {
    jcbYear.setSelectedIndex(select + 1);
   }
   }
   else if (e.getSource() == jbMonthPre)
   {
   int select = jcbMonth.getSelectedIndex();
   if (select > 0)
   {
    jcbMonth.setSelectedIndex(select - 1);
   }
   }
   else if (e.getSource() == jbMonthNext)
   {
   int select = jcbMonth.getSelectedIndex();
   if (select < jcbMonth.getItemCount() - 1)
   {
    jcbMonth.setSelectedIndex(select + 1);
   }
   }
   else if (e.getSource() == jbChoose)
   {
   flag = true;
   closeDateChooser();
   }
   else if (e.getSource() == jbToday)
   {
   flag = true;
   Calendar calendar = Calendar.getInstance();
   year = calendar.get(Calendar.YEAR);
   month = calendar.get(Calendar.MONTH) + 1;
   date = calendar.get(Calendar.DATE);
   closeDateChooser();
   }
   else if (e.getSource() == jbCancel)
   {
   flag = false;
   closeDateChooser();
   }
  }
 }

 /**
 * 下拉选择框项改变监听
 * 
 * @author jianggujin
 * 
 */
 final class ComboBoxItemListener implements ItemListener
 {

  public void itemStateChanged(ItemEvent e)
  {
   if (e.getSource() == jcbYear)
   {
   int year = parseYearOrMonth(jcbYear.getSelectedItem().toString());
   if (year != JDateChooser.this.year)
   {
    JDateChooser.this.year = year;
    changeDate();
   }
   }
   else if (e.getSource() == jcbMonth)
   {
   int month = parseYearOrMonth(jcbMonth.getSelectedItem().toString());
   if (month != JDateChooser.this.month)
   {
    JDateChooser.this.month = month;
    changeDate();
   }
   }
  }
 }
}

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