改写的基于SWING的日期选择控件

内容: http://www.matrix.org.cn/blog/liu2liu2上次公司需要，搞了一个SWING的Aapplication的DEMO，重新弄了一般SWING，可惜最后无疾而终，可悲.....最近离职，把以前的东西整理了一下，觉得多少有点用处，写下算是悼念吧！这是其中日期选择控件的代码，改编自网上某个程序(记不得了)，界面如下所示： IMG http://www.matrix.org.cn/blog/liu2liu2/images/swing-datepicker.png[/IMG]源代码：//DatePicker.javapackage com.kxsoft.component;import java.awt.*;import java.awt.event.*;import java.util.GregorianCalendar;import java.util.Date;import java.util.Calendar;import java.text.DateFormat;import java.text.FieldPosition;import javax.swing.*;import javax.swing.plaf.BorderUIResource;public final class DatePicker extends JPanel { private static final long serialVersionUID = 1L; private static final int startX = 10; private static final int startY = 60; private static final Font smallFont = new Font('Dialog', Font.PLAIN, 10); private static final Font largeFont = new Font('Dialog', Font.PLAIN, 12); private static final Insets insets = new Insets(2, 2, 2, 2); private static final Color highlight = new Color(255, 255, 204); private static final Color white = new Color(255, 255, 255); private static final Color gray = new Color(204, 204, 204); private Component selectedDay = null; private GregorianCalendar selectedDate = null; private GregorianCalendar originalDate = null; private boolean hideOnSelect = true; private final JButton backButton = new JButton(); private final JLabel monthAndYear = new JLabel(); private final JButton forwardButton = new JButton(); private final JLabel[] dayHeadings = new JLabel[]{ new JLabel('日'), new JLabel('一'), new JLabel('二'), new JLabel('三'), new JLabel('四'), new JLabel('五'), new JLabel('六')}; private final JLabel[][] daysInMonth = new JLabel[][]{ {new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel()}, {new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel()}, {new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel()}, {new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel()}, {new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel()}, {new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel(), new JLabel()} }; private final JButton todayButton = new JButton(); private final JButton cancelButton = new JButton(); public DatePicker() { super(); selectedDate = getToday(); init(); } public DatePicker(final Date initialDate) { super(); if (null == initialDate) selectedDate = getToday(); else (selectedDate = new GregorianCalendar()).setTime(initialDate); originalDate = new GregorianCalendar( selectedDate.get(Calendar.YEAR), selectedDate.get(Calendar.MONTH), selectedDate.get(Calendar.DATE)); init(); } public boolean isHideOnSelect() { return hideOnSelect; } public void setHideOnSelect(final boolean hideOnSelect) { if (this.hideOnSelect != hideOnSelect) { this.hideOnSelect = hideOnSelect; initButtons(false); } } public Date getDate() { if (null != selectedDate) return selectedDate.getTime(); return null; } private void init() { setLayout(new AbsoluteLayout()); this.setMinimumSize(new Dimension(161, 226)); this.setMaximumSize(getMinimumSize()); this.setPreferredSize(getMinimumSize()); this.setBorder(new BorderUIResource.EtchedBorderUIResource()); backButton.setFont(smallFont); backButton.setText(''); forwardButton.setMargin(insets); forwardButton.setDefaultCapable(false); forwardButton.addActionListener(new ActionListener() { public void actionPerformed(final ActionEvent evt) { onForwardClicked(evt); } }); add(forwardButton, new AbsoluteConstraints(130, 10, 20, 20)); int x = startX; for (int ii = 0; ii < dayHeadings.length; ii++) { dayHeadings[ii].setOpaque(true); dayHeadings[ii].setBackground(Color.LIGHT_GRAY); dayHeadings[ii].setForeground(Color.WHITE); dayHeadings[ii].setHorizontalAlignment(JLabel.CENTER); add(dayHeadings[ii], new AbsoluteConstraints(x, 40, 21, 21)); x += 20; } x = startX; int y = startY; for (int ii = 0; ii < daysInMonth.length; ii++) { for (int jj = 0; jj < daysInMonth[ii].length; jj++) {daysInMonth[ii][jj].setOpaque(true); daysInMonth[ii][jj].setBackground(white); daysInMonth[ii][jj].setFont(smallFont); daysInMonth[ii][jj].setHorizontalAlignment(JLabel.CENTER); daysInMonth[ii][jj].setText(''); daysInMonth[ii][jj].addMouseListener(new MouseAdapter() { public void mouseClicked(final MouseEvent evt) { onDayClicked(evt); } }); add(daysInMonth[ii][jj], new AbsoluteConstraints(x, y, 21, 21)); x += 20; } x = startX; y += 20; } initButtons(true); calculateCalendar(); } private void initButtons(final boolean firstTime) { if (firstTime) { final Dimension buttonSize = new Dimension(68, 24); todayButton.setText('今天'); todayButton.setMargin(insets); todayButton.setMaximumSize(buttonSize); todayButton.setMinimumSize(buttonSize); todayButton.setPreferredSize(buttonSize); todayButton.setDefaultCapable(true); todayButton.setSelected(true); todayButton.addActionListener(new ActionListener() { public void actionPerformed(final ActionEvent evt) { onToday(evt); } }); cancelButton.setText('取消'); cancelButton.setMargin(insets); cancelButton.setMaximumSize(buttonSize); cancelButton.setMinimumSize(buttonSize); cancelButton.setPreferredSize(buttonSize); cancelButton.addActionListener(new ActionListener() { public void actionPerformed(final ActionEvent evt) { onCancel(evt); } }); } else { this.remove(todayButton); this.remove(cancelButton); } if (hideOnSelect) { add(todayButton, new AbsoluteConstraints(25, 190, 52, -1)); add(cancelButton, new AbsoluteConstraints(87, 190, 52, -1)); } else { add(todayButton, new AbsoluteConstraints(55, 190, 52, -1)); } } private void onToday(final java.awt.event.ActionEvent evt) { selectedDate = getToday(); setVisible(!hideOnSelect); if (isVisible()) { monthAndYear.setText(formatDateText(selectedDate.getTime())); calculateCalendar(); } } private void onCancel(final ActionEvent evt) { selectedDate = originalDate; setVisible(!hideOnSelect); } private void onForwardClicked(final java.awt.event.ActionEvent evt) { final int day = selectedDate.get(Calendar.DATE); selectedDate.set(Calendar.DATE, 1); selectedDate.add(Calendar.MONTH, 1); selectedDate.set(Calendar.DATE, Math.min(day, calculateDaysInMonth(selectedDate))); monthAndYear.setText(formatDateText(selectedDate.getTime())); calculateCalendar(); } private void onBackClicked(final java.awt.event.ActionEvent evt) { final int day = selectedDate.get(Calendar.DATE); selectedDate.set(Calendar.DATE, 1); selectedDate.add(Calendar.MONTH, -1); selectedDate.set(Calendar.DATE, Math.min(day, calculateDaysInMonth(selectedDate))); monthAndYear.setText(formatDateText(selectedDate.getTime())); calculateCalendar(); } private void onDayClicked(final java.awt.event.MouseEvent evt) { final javax.swing.JLabel fld = (javax.swing.JLabel) evt.getSource(); if (!''.equals(fld.getText())) { fld.setBackground(highlight); selectedDay = fld; selectedDate.set( Calendar.DATE, Integer.parseInt(fld.getText())); setVisible(!hideOnSelect); } } private static GregorianCalendar getToday() { final GregorianCalendar gc = new GregorianCalendar(); gc.set(Calendar.HOUR_OF_DAY, 0); gc.set(Calendar.MINUTE, 0); gc.set(Calendar.SECOND, 0); gc.set(Calendar.MILLISECOND, 0); return gc; } private void calculateCalendar() { if (null != selectedDay) { selectedDay.setBackground(white); selectedDay = null; } final GregorianCalendar c = new GregorianCalendar( selectedDate.get(Calendar.YEAR), selectedDate.get(Calendar.MONTH), 1); final int maxDay = calculateDaysInMonth(c); final int selectedDay = Math.min(maxDay, selectedDate.get( Calendar.DATE)); int dow = c.get(Calendar.DAY_OF_WEEK); for (int dd = 0; dd < dow; dd++) { daysInMonth[0][dd].setText(''); } int week; do { week = c.get(Calendar.WEEK_OF_MONTH); dow = c.get(Calendar.DAY_OF_WEEK); final JLabel fld = this.daysInMonth[week - 1][dow - 1]; fld.setText(Integer.toString(c.get(Calendar.DATE))); if (selectedDay == c.get(Calendar.DATE)) { fld.setBackground(highlight); this.selectedDay = fld; } if (c.get(Calendar.DATE)>= maxDay) break; c.add(Calendar.DATE, 1); } while (c.get(Calendar.DATE)