本文实例讲述了java实现变更文件查询的方法。分享给大家供大家参考。具体如下：
自己经常发布包时需要查找那些文件时上次发包后更新的数据文件，所以写了这个发布包，
拷贝输出的命令，dos窗口下执行，
为啥不直接复制文件，因为java拷贝文件会修改文件最后修改日期，所以采用dos下的拷贝。
package com.cn.wangk.tools;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Calendar;
import java.util.GregorianCalendar;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.Jframe;
import javax.swing.JPanel;
public class Cal extends JPanel{
protected int yy;
protected int mm, dd;
protected JButton labs[][];
protected int leadGap = 0;
Calendar calendar = new GregorianCalendar();
protected final int thisYear = calendar.get(Calendar.YEAR);
protected final int thisMonth = calendar.get(Calendar.MONTH);
private JButton b0;
private JComboBox monthChoice;
private JComboBox yearChoice;
Cal(){
super();
setYYMMDD(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),
calendar.get(Calendar.DAY_OF_MONTH));
buildGUI();
recompute();
}
Cal(int year, int month, int today){
super();
setYYMMDD(year, month, today);
buildGUI();
recompute();
}
private void setYYMMDD(int year, int month, int today){
yy = year;
mm = month;
dd = today;
}
String[] months ={ "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December" };
private void buildGUI(){
getAccessibleContext().setAccessibleDescription(
"Calendar not accessible yet. Sorry!");
setBorder(BorderFactory.createEtchedBorder());
setLayout(new BorderLayout());
JPanel tp = new JPanel();
tp.add(monthChoice = new JComboBox());
for (int i = 0; i < months.length; i++)
monthChoice.addItem(months[i]);
monthChoice.setSelectedItem(months[mm]);
monthChoice.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
int i = monthChoice.getSelectedIndex();
if (i >= 0){
mm = i;
// System.out.println("Month=" + mm);
recompute();
}
}
});
monthChoice.getAccessibleContext().setAccessibleName("Months");
monthChoice.getAccessibleContext().setAccessibleDescription(
"Choose a month of the year");
tp.add(yearChoice = new JComboBox());
yearChoice.setEditable(true);
for (int i = yy - 5; i < yy + 5; i++)
yearChoice.addItem(Integer.toString(i));
yearChoice.setSelectedItem(Integer.toString(yy));
yearChoice.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
int i = yearChoice.getSelectedIndex();
if (i >= 0){
yy = Integer.parseInt(yearChoice.getSelectedItem()
.toString());
// System.out.println("Year=" + yy);
recompute();
}
}
});
add(BorderLayout.CENTER, tp);
JPanel bp = new JPanel();
bp.setLayout(new GridLayout(7, 7));
labs = new JButton[6][7]; // first row is days
bp.add(b0 = new JButton("S"));
bp.add(new JButton("M"));
bp.add(new JButton("T"));
bp.add(new JButton("W"));
bp.add(new JButton("R"));
bp.add(new JButton("F"));
bp.add(new JButton("S"));
ActionListener dateSetter = new ActionListener(){
public void actionPerformed(ActionEvent e){
String num = e.getActionCommand();
if (!num.equals("")){
// set the current day highlighted
setDayActive(Integer.parseInt(num));
// When this becomes a Bean, you can
// fire some kind of DateChanged event here.
// Also, build a similar daySetter for day-of-week btns.
}
}
};
// Construct all the buttons, and add them.
for (int i = 0; i < 6; i++)
for (int j = 0; j < 7; j++){
bp.add(labs[i][j] = new JButton(""));
labs[i][j].addActionListener(dateSetter);
}
add(BorderLayout.SOUTH, bp);
}
public final static int dom[] ={ 31, 28, 31, 30,
31, 30, 31, 31,
30, 31, 30, 31
};
protected void recompute(){
// System.out.println("Cal::recompute: " + yy + ":" + mm + ":" + dd);
if (mm < 0 || mm > 11)
throw new IllegalArgumentException("Month " + mm
+ " bad, must be 0-11");
clearDayActive();
calendar = new GregorianCalendar(yy, mm, dd);
// Compute how much to leave before the first.
// getDay() returns 0 for Sunday, which is just right.
leadGap = new GregorianCalendar(yy, mm, 1).get(Calendar.DAY_OF_WEEK) - 1;
// System.out.println("leadGap = " + leadGap);
int daysInMonth = dom[mm];
if (isLeap(calendar.get(Calendar.YEAR)) && mm > 1)
++daysInMonth;
// Blank out the labels before 1st day of month
for (int i = 0; i < leadGap; i++){
labs[0][i].setText("");
}
// Fill in numbers for the day of month.
for (int i = 1; i <= daysInMonth; i++){
JButton b = labs[(leadGap + i - 1) / 7][(leadGap + i - 1) % 7];
b.setText(Integer.toString(i));
}
// 7 days/week * up to 6 rows
for (int i = leadGap + 1 + daysInMonth; i < 6 * 7; i++){
labs[(i) / 7][(i) % 7].setText("");
}
// Shade current day, only if current month
if (thisYear == yy && mm == thisMonth)
setDayActive(dd); // shade the box for today
// Say we need to be drawn on the screen
repaint();
}
public boolean isLeap(int year){
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
return true;
return false;
}
public void setDate(int yy, int mm, int dd){
// System.out.println("Cal::setDate");
this.yy = yy;
this.mm = mm; // starts at 0, like Date
this.dd = dd;
recompute();
}
private void clearDayActive(){
JButton b;
// First un-shade the previously-selected square, if any
if (activeDay > 0){
b = labs[(leadGap + activeDay - 1) / 7][(leadGap + activeDay - 1) % 7];
b.setBackground(b0.getBackground());
b.repaint();
activeDay = -1;
}
}
private int activeDay = -1;
public void setDayActive(int newDay){
clearDayActive();
// Set the new one
if (newDay <= 0)
dd = new GregorianCalendar().get(Calendar.DAY_OF_MONTH);
else
dd = newDay;
// Now shade the correct square
Component square = labs[(leadGap + newDay - 1) / 7][(leadGap + newDay - 1) % 7];
square.setBackground(Color.red);
square.repaint();
activeDay = newDay;
}
public static void main(String[] av){
Jframe f = new Jframe("Cal");
Container c = f.getContentPane();
c.setLayout(new FlowLayout());
// for this test driver, hardcode 1995/02/10.
c.add(new Cal(1995, 2 - 1, 10));
// and beside it, the current month.
c.add(new Cal());
f.pack();
f.setVisible(true);
}
}
希望本文所述对大家的java程序设计有所帮助。
