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);
}
}

希望本文所述对大家的java程序设计有所帮助。