怎么样使用java日历控件？
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];//firstrowisdaysbp.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("")){//setthecurrentdayhighlightedsetDayActive(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;//Blankoutthelabelsbefore1stdayofmonthfor(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*upto6rowsfor(inti=leadGap+1+daysInMonth;i<6*7;i++){labs[(i)/7][(i)%7].setText("");}//Shadecurrentday,onlyifcurrentmonthif(thisYear==yy&&mm==thisMonth)setDayActive(dd);//shadetheboxfortoday//Sayweneedtobedrawnonthescreenrepaint();}/***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,likeDatethis.dd=dd;recompute();}/**Unsetanypreviouslyhighlightedday*/privatevoidclearDayActive(){JButtonb;//Firstun-shadethepreviously-selectedsquare,ifanyif(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();//Setthenewoneif(newDay<=0)dd=newGregorianCalendar().get(Calendar.DAY_OF_MONTH);elsedd=newDay;//NowshadethecorrectsquareComponentsquare=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);}}本文地址：http://www.45fan.com/dnjc/68892.html