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
*/
packagecom.cn.wangk.tools;
importjava.awt.BorderLayout;
importjava.awt.Color;
importjava.awt.Component;
importjava.awt.Container;
importjava.awt.FlowLayout;
importjava.awt.GridLayout;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjava.util.Calendar;
importjava.util.GregorianCalendar;
importjavax.swing.BorderFactory;
importjavax.swing.JButton;
importjavax.swing.JComboBox;
importjavax.swing.JFrame;
importjavax.swing.JPanel;
/***//**
*BeantodisplayamonthcalendarinaJPanel.OnlyworksfortheWestern
*calendar.
*
*@authorIanF.Darwin,http://www.darwinsys.com/
*@version$Id:Cal.java,v1.52004/02/0903:33:45ianExp$
*/
publicclassCalextendsJPanel{
/***//**Thecurrently-interestingyear(notmodulo1900!)*/
protectedintyy;
/***//**Currently-interestingmonthandday*/
protectedintmm,dd;
/***//**Thebuttonstobedisplayed*/
protectedJButtonlabs[][];
/***//**Thenumberofdaysquarestoleaveblankatthestartofthismonth*/
protectedintleadGap=0;
/***//**ACalendarobjectusedthroughout*/
Calendarcalendar=newGregorianCalendar();
/***//**Today'syear*/
protectedfinalintthisYear=calendar.get(Calendar.YEAR);
/***//**Today'smonth*/
protectedfinalintthisMonth=calendar.get(Calendar.MONTH);
/***//**Oneofthebuttons.WejustkeepitsreferenceforgetBackground().*/
privateJButtonb0;
/***//**Themonthchoice*/
privateJComboBoxmonthChoice;
/***//**Theyearchoice*/
privateJComboBoxyearChoice;
/***//**
*ConstructaCal,startingwithtoday.
*/
Cal(){
super();
setYYMMDD(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),
calendar.get(Calendar.DAY_OF_MONTH));
buildGUI();
recompute();
}
/***//**
*ConstructaCal,giventheleadingdaysandthetotaldays
*
*@exceptionIllegalArgumentException
*Ifyearoutofrange
*/
Cal(intyear,intmonth,inttoday){
super();
setYYMMDD(year,month,today);
buildGUI();
recompute();
}
privatevoidsetYYMMDD(intyear,intmonth,inttoday){
yy=year;
mm=month;
dd=today;
}
String[]months={"January","February","March","April","May","June",
"July","August","September","October","November","December"};
/***//**BuildtheGUI.AssumesthatsetYYMMDDhasbeencalled.*/
privatevoidbuildGUI(){
getAccessibleContext().setAccessibleDescription(
"Calendarnotaccessibleyet.Sorry!");
setBorder(BorderFactory.createEtchedBorder());
setLayout(newBorderLayout());
JPaneltp=newJPanel();
tp.add(monthChoice=newJComboBox());
for(inti=0;i<months.length;i++)
monthChoice.addItem(months[i]);
monthChoice.setSelectedItem(months[mm]);
monthChoice.addActionListener(newActionListener(){
publicvoidactionPerformed(ActionEventae){
inti=monthChoice.getSelectedIndex();
if(i>=0){
mm=i;
//System.out.println("Month="+mm);
recompute();
}
}
});
monthChoice.getAccessibleContext().setAccessibleName("Months");
monthChoice.getAccessibleContext().setAccessibleDescription(
"Chooseamonthoftheyear");
tp.add(yearChoice=newJComboBox());
yearChoice.setEditable(true);
for(inti=yy-5;i<yy+5;i++)
yearChoice.addItem(Integer.toString(i));
yearChoice.setSelectedItem(Integer.toString(yy));
yearChoice.addActionListener(newActionListener(){
publicvoidactionPerformed(ActionEventae){
inti=yearChoice.getSelectedIndex();
if(i>=0){
yy=Integer.parseInt(yearChoice.getSelectedItem()
.toString());
//System.out.println("Year="+yy);
recompute();
}
}
});
add(BorderLayout.CENTER,tp);
JPanelbp=newJPanel();
bp.setLayout(newGridLayout(7,7));
labs=newJButton[6][7];//firstrowisdays
bp.add(b0=newJButton("S"));
bp.add(newJButton("M"));
bp.add(newJButton("T"));
bp.add(newJButton("W"));
bp.add(newJButton("R"));
bp.add(newJButton("F"));
bp.add(newJButton("S"));
ActionListenerdateSetter=newActionListener(){
publicvoidactionPerformed(ActionEvente){
Stringnum=e.getActionCommand();
if(!num.equals("")){
//setthecurrentdayhighlighted
setDayActive(Integer.parseInt(num));
//WhenthisbecomesaBean,youcan
//firesomekindofDateChangedeventhere.
//Also,buildasimilardaySetterforday-of-weekbtns.
}
}
};
//Constructallthebuttons,andaddthem.
for(inti=0;i<6;i++)
for(intj=0;j<7;j++){
bp.add(labs[i][j]=newJButton(""));
labs[i][j].addActionListener(dateSetter);
}
add(BorderLayout.SOUTH,bp);
}
publicfinalstaticintdom[]={31,28,31,30,/**//*janfebmarapr*/
31,30,31,31,/**//*mayjunjulaug*/
30,31,30,31/**//*sepoctnovdec*/
};
/***//**Computewhichdaystoputwhere,intheCalpanel*/
protectedvoidrecompute(){
//System.out.println("Cal::recompute:"+yy+":"+mm+":"+dd);
if(mm<0||mm>11)
thrownewIllegalArgumentException("Month"+mm
+"bad,mustbe0-11");
clearDayActive();
calendar=newGregorianCalendar(yy,mm,dd);
//Computehowmuchtoleavebeforethefirst.
//getDay()returns0forSunday,whichisjustright.
leadGap=newGregorianCalendar(yy,mm,1).get(Calendar.DAY_OF_WEEK)-1;
//System.out.println("leadGap="+leadGap);
intdaysInMonth=dom[mm];
if(isLeap(calendar.get(Calendar.YEAR))&&mm>1)
++daysInMonth;
//Blankoutthelabelsbefore1stdayofmonth
for(inti=0;i<leadGap;i++){
labs[0][i].setText("");
}
//Fillinnumbersforthedayofmonth.
for(inti=1;i<=daysInMonth;i++){
JButtonb=labs[(leadGap+i-1)/7][(leadGap+i-1)%7];
b.setText(Integer.toString(i));
}
//7days/week*upto6rows
for(inti=leadGap+1+daysInMonth;i<6*7;i++){
labs[(i)/7][(i)%7].setText("");
}
//Shadecurrentday,onlyifcurrentmonth
if(thisYear==yy&&mm==thisMonth)
setDayActive(dd);//shadetheboxfortoday
//Sayweneedtobedrawnonthescreen
repaint();
}
/***//**
*isLeap()returnstrueifthegivenyearisaLeapYear.
*
*"ayearisaleapyearifitisdivisibleby4butnotby100,except
*thatyearsdivisibleby400*are*leapyears."--Kernighan&Ritchie,
*_TheCProgrammingLanguage_,p37.
*/
publicbooleanisLeap(intyear){
if(year%4==0&&year%100!=0||year%400==0)
returntrue;
returnfalse;
}
/***//**Settheyear,month,andday*/
publicvoidsetDate(intyy,intmm,intdd){
//System.out.println("Cal::setDate");
this.yy=yy;
this.mm=mm;//startsat0,likeDate
this.dd=dd;
recompute();
}
/***//**Unsetanypreviouslyhighlightedday*/
privatevoidclearDayActive(){
JButtonb;
//Firstun-shadethepreviously-selectedsquare,ifany
if(activeDay>0){
b=labs[(leadGap+activeDay-1)/7][(leadGap+activeDay-1)%7];
b.setBackground(b0.getBackground());
b.repaint();
activeDay=-1;
}
}
privateintactiveDay=-1;
/***//**Setjusttheday,onthecurrentmonth*/
publicvoidsetDayActive(intnewDay){
clearDayActive();
//Setthenewone
if(newDay<=0)
dd=newGregorianCalendar().get(Calendar.DAY_OF_MONTH);
else
dd=newDay;
//Nowshadethecorrectsquare
Componentsquare=labs[(leadGap+newDay-1)/7][(leadGap+newDay-1)%7];
square.setBackground(Color.red);
square.repaint();
activeDay=newDay;
}
/***//**Fortesting,amainprogram*/
publicstaticvoidmain(String[]av){
JFramef=newJFrame("Cal");
Containerc=f.getContentPane();
c.setLayout(newFlowLayout());
//forthistestdriver,hardcode1995/02/10.
c.add(newCal(1995,2-1,10));
//andbesideit,thecurrentmonth.
c.add(newCal());
f.pack();
f.setVisible(true);
}
}
希望本文所述对大家的java程序设计有所帮助。