java实现变更文件查询的方法

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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);
 }
}