java实现变更文件查询的方法

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。

				?

									/*

									 *

									 * 更改所生成文件模板为

									 * 窗口 > 首选项 > Java > 代码生成 > 代码和注释

									 */

									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;

									/** *//**

									 * Bean to display a month calendar in a JPanel. Only works for the Western

									 * calendar.

									 * 

									 * @author Ian F. Darwin, http://www.darwinsys.com/

									 * @version $Id: Cal.java,v 1.5 2004/02/09 03:33:45 ian Exp $

									 */

									public class Cal extends JPanel{

									 /** *//** The currently-interesting year (not modulo 1900!) */

									 protected int yy;

									 /** *//** Currently-interesting month and day */

									 protected int mm, dd;

									 /** *//** The buttons to be displayed */

									 protected JButton labs[][];

									 /** *//** The number of day squares to leave blank at the start of this month */

									 protected int leadGap = 0;

									 /** *//** A Calendar object used throughout */

									 Calendar calendar = new GregorianCalendar();

									 /** *//** Today's year */

									 protected final int thisYear = calendar.get(Calendar.YEAR);

									 /** *//** Today's month */

									 protected final int thisMonth = calendar.get(Calendar.MONTH);

									 /** *//** One of the buttons. We just keep its reference for getBackground(). */

									 private JButton b0;

									 /** *//** The month choice */

									 private JComboBox monthChoice;

									 /** *//** The year choice */

									 private JComboBox yearChoice;

									 /** *//**

									  * Construct a Cal, starting with today.

									  */

									 Cal(){

									  super();

									  setYYMMDD(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),

									    calendar.get(Calendar.DAY_OF_MONTH));

									  buildGUI();

									  recompute();

									 }

									 /** *//**

									  * Construct a Cal, given the leading days and the total days

									  * 

									  * @exception IllegalArgumentException

									  *        If year out of range

									  */

									 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" };

									 /** *//** Build the GUI. Assumes that setYYMMDD has been called. */

									 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, /**//* jan feb mar apr */

									 31, 30, 31, 31, /**//* may jun jul aug */

									 30, 31, 30, 31 /**//* sep oct nov dec */

									 };

									 /** *//** Compute which days to put where, in the Cal panel */

									 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();

									 }

									 /** *//**

									  * isLeap() returns true if the given year is a Leap Year.

									  * 

									  * "a year is a leap year if it is divisible by 4 but not by 100, except

									  * that years divisible by 400 *are* leap years." -- Kernighan & Ritchie,

									  * _The C Programming Language_, p 37.

									  */

									 public boolean isLeap(int year){

									  if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)

									   return true;

									  return false;

									 }

									 /** *//** Set the year, month, and day */

									 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();

									 }

									 /** *//** Unset any previously highlighted day */

									 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;

									 /** *//** Set just the day, on the current month */

									 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;

									 }

									 /** *//** For testing, a main program */

									 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);

									 }

									}