Java Common Date Processing class __java

Import Java.text.SimpleDateFormat;   
Import java.util.ArrayList;   
Import Java.util.Calendar;   
Import Java.util.Date;   
Import Java.util.GregorianCalendar;   
  
Import Java.util.LinkedHashMap; /** * Date Common processing class * * @author Songjun * @version 1.3/public class Dateutil {/** * Resolve a date All months * * @param begindatestr * @param enddatestr * @return * * public static ARR  Aylist getmonthlist (String begindatestr, String enddatestr) {//Specify the time format to resolve simpledateformat f = new   
        SimpleDateFormat ("yyyy-mm");   
  
        The returned month list String Sret = "";   
        Define some variables Date begindate = null;   
  
        Date enddate = null;   
        GregorianCalendar BEGINGC = null;   
        GregorianCalendar ENDGC = null;   
  
        ArrayList list = new ArrayList ();   
            try {//parse the string into a date Begindate = F.parse (BEGINDATESTR); EndDate = F.parse (ENDDATESTR);   
            Set Calendar BEGINGC = new GregorianCalendar ();   
  
            Begingc.settime (begindate);   
            ENDGC = new GregorianCalendar ();   
  
            Endgc.settime (EndDate); Until two times the same while (Begingc.gettime (). CompareTo (Endgc.gettime ()) <= 0) {Sret = beging   
                C.get (calendar.year) + "-" + (Begingc.get (calendar.month) + 1);   
                List.add (Sret);   
            In month, increase time Begingc.add (Calendar.month, 1);   
        } return list;   
            catch (Exception e) {e.printstacktrace ();   
        return null; }/** * Resolves all dates between one date period * * @param begindatestr * Start date * @param enddatestr * End Date * @return/public static ArrayList getdaylist (String begi NDATESTR, String enddATESTR) {//Specifies the time format to parse SimpleDateFormat f = new SimpleDateFormat ("Yyyy-mm-dd");   
        Define some variables Date begindate = null;   
  
        Date enddate = null;   
        Calendar BEGINGC = null;   
        Calendar ENDGC = null;   
  
        ArrayList list = new ArrayList ();   
            try {//parse the string into a date Begindate = F.parse (BEGINDATESTR);   
  
            EndDate = F.parse (ENDDATESTR);   
            Set Calendar BEGINGC = Calendar.getinstance ();   
  
            Begingc.settime (begindate);   
            ENDGC = Calendar.getinstance ();   
            Endgc.settime (EndDate);   
  
            SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd"); Until two times the same while (Begingc.gettime (). CompareTo (Endgc.gettime ()) <= 0) {List.add (s   
                Df.format (Begingc.gettime ())); In days, increase the time Begingc.add (Calendar.day_of_month, 1);   
            } return list;   
            catch (Exception e) {e.printstacktrace ();   
        return null;   
        The public static ArrayList Getyearlist () {ArrayList list = new ArrayList ();   
        Calendar c = null;   
        c = calendar.getinstance ();   
        C.settime (New Date ());   
  
        int curryear = Calendar.getinstance (). get (Calendar.year);   
        int startyear = currYear-5;   
        int endyear = curryear + 10;   
        for (int i = StartYear i < endyear; i++) {List.add (new Integer (i));   
    } return list;   
    public static int Getcurryear () {return calendar.getinstance (). get (Calendar.year); /** * Get the total number of years * * @param year * @return/public static Linkedhas   
        Hmap getweeklist (int year) {Linkedhashmap map = new Linkedhashmap (); Calendar C= new GregorianCalendar ();   
        C.set (year, Calendar.december, 31, 23, 59, 59);   
  
        int count = Getweekofyear (C.gettime ());   
        SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd");   
        String Dayofweekstart = "";   
        String dayofweekend = "";   
            for (int i = 1; I <= count; i++) {Dayofweekstart = Sdf.format (Getfirstdayofweek (year, i));   
            Dayofweekend = Sdf.format (Getlastdayofweek (year, i));   
        Map.put (New Integer (i), "+i+" Week (from "+dayofweekstart +" to "+ dayofweekend+"));   
  
    } return map; /** * Get the total number of weeks in a year * @param years * @return/public static int Getweekcoun   
        Tinyear (int year) {Calendar c = new GregorianCalendar ();   
        C.set (year, Calendar.december, 31, 23, 59, 59);   
        int count = Getweekofyear (C.gettime ());   
    return count;   
     /** * How many weeks to get the current date ** @param date * @return/public static int getweekofyear (date date) {Calendar c = new Gr   
        Egoriancalendar ();   
        C.setfirstdayofweek (Calendar.monday);   
        C.setminimaldaysinfirstweek (7);   
  
        C.settime (date);   
    Return C.get (calendar.week_of_year); /** * Get the first day of the week * * @param year * @param week * @return * p   
        Ublic static Date Getfirstdayofweek (int year, int week) {Calendar c = new GregorianCalendar ();   
        C.set (Calendar.year, year);   
        C.set (Calendar.month, calendar.january);   
  
        C.set (calendar.date, 1);   
        Calendar cal = (GregorianCalendar) c.clone ();   
  
        Cal.add (calendar.date, week * 7);   
    Return Getfirstdayofweek (Cal.gettime ());  
    /** * Get the last day of a certain week * * @param year * @param week * @return * * public static Date Getlastdayofweek (int year, int week) {Calendar c = new GregorianCalendar ();   
        C.set (Calendar.year, year);   
        C.set (Calendar.month, calendar.january);   
  
        C.set (calendar.date, 1);   
        Calendar cal = (GregorianCalendar) c.clone ();   
  
        Cal.add (calendar.date, week * 7);   
    Return Getlastdayofweek (Cal.gettime ()); /** * Get the first day of a certain month * @param year * @param month * @return * * * publi   
        C Static Date getfirestdayofmonth (int year,int month) {month = month-1;      
        Calendar C = calendar.getinstance ();   
        C.set (Calendar.year, year);   
           
        C.set (Calendar.month, MONTH);   
  
        int day = C.getactualminimum (c.day_of_month);   
        C.set (Calendar.day_of_month, day);   
           
    return C.gettime (); /** * refers to the last day of a certain month * @param year * @param month * @return * * * Publ IC STatic Date getlastdayofmonth (int year,int month) {month = month-1;      
        Calendar C = calendar.getinstance ();   
        C.set (Calendar.year, year);   
        C.set (Calendar.month, MONTH);   
        int day = C.getactualmaximum (c.day_of_month);   
        C.set (Calendar.day_of_month, day);   
    return C.gettime (); /** * Obtain the first day of the week of the current date * * @param date * @return/public static date   
        Getfirstdayofweek (date date) {Calendar c = new GregorianCalendar ();   
        C.setfirstdayofweek (Calendar.monday);   
        C.settime (date); C.set (Calendar.day_of_week, C.getfirstdayofweek ());   
    Monday return C.gettime ();  /** * Get the last day of the week with the current date * * @param date * @return/public static date   
        Getlastdayofweek (date date) {Calendar c = new GregorianCalendar ();   
C.setfirstdayofweek (Calendar.monday);        C.settime (date); C.set (Calendar.day_of_week, C.getfirstdayofweek () + 6);   
    Sunday return C.gettime ();   }   
  
}