Java获取各种常用时间方法

这个引用别人的一个 有关JAVA时间方法  觉得比较实用  这个就转载了 
 import java.text.ParsePosition; 
 import java.text.SimpleDateFormat; 
 import java.util.Calendar; 
 import java.util.Date; 
 import java.util.GregorianCalendar; 
  
 /**
  * @author HeFeng      2008-12-1 下午08:43:57
  * @version 1.0
  */ 
 public class TimeTest { 
     //用来全局控制 上一周，本周，下一周的周数变化 
     private  int weeks = 0; 
     private int MaxDate;//一月最大天数 
     private int MaxYear;//一年最大天数 
      
      
     /**
      * @param args
      */ 
     public static void main(String[] args) { 
         TimeTest tt = new TimeTest(); 
         System.out.println("获取当天日期:"+tt.getNowTime("yyyy-MM-dd")); 
         System.out.println("获取本周一日期:"+tt.getMondayOFWeek()); 
         System.out.println("获取本周日的日期~:"+tt.getCurrentWeekday()); 
         System.out.println("获取上周一日期:"+tt.getPreviousWeekday()); 
         System.out.println("获取上周日日期:"+tt.getPreviousWeekSunday()); 
         System.out.println("获取下周一日期:"+tt.getNextMonday()); 
         System.out.println("获取下周日日期:"+tt.getNextSunday()); 
         System.out.println("获得相应周的周六的日期:"+tt.getNowTime("yyyy-MM-dd")); 
         System.out.println("获取本月第一天日期:"+tt.getFirstDayOfMonth()); 
         System.out.println("获取本月最后一天日期:"+tt.getDefaultDay()); 
         System.out.println("获取上月第一天日期:"+tt.getPreviousMonthFirst()); 
         System.out.println("获取上月最后一天的日期:"+tt.getPreviousMonthEnd()); 
         System.out.println("获取下月第一天日期:"+tt.getNextMonthFirst()); 
         System.out.println("获取下月最后一天日期:"+tt.getNextMonthEnd()); 
         System.out.println("获取本年的第一天日期:"+tt.getCurrentYearFirst()); 
         System.out.println("获取本年最后一天日期:"+tt.getCurrentYearEnd()); 
         System.out.println("获取去年的第一天日期:"+tt.getPreviousYearFirst()); 
         System.out.println("获取去年的最后一天日期:"+tt.getPreviousYearEnd()); 
         System.out.println("获取明年第一天日期:"+tt.getNextYearFirst()); 
         System.out.println("获取明年最后一天日期:"+tt.getNextYearEnd()); 
         System.out.println("获取本季度第一天到最后一天:"+tt.getThisSeasonTime(11)); 
         System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"+TimeTest.getTwoDay("2008-12-1","2008-9-29")); 
         System.out.println("根据日期获得星期几:"+TimeTest.getWeek("2008-12-1")); 
     } 
      
      
     /**
         * 得到二个日期间的间隔天数
         */ 
     public static String getTwoDay(String sj1, String sj2) { 
         SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); 
         long day = 0; 
         try { 
          java.util.Date date = myFormatter.parse(sj1); 
          java.util.Date mydate = myFormatter.parse(sj2); 
          day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); 
         } catch (Exception e) { 
          return ""; 
         } 
         return day + ""; 
     } 
  
  
     /**
         * 根据一个日期，返回是星期几的字符串
         * 
         * @param sdate
         * @return
         */ 
     public static String getWeek(String sdate) { 
         // 再转换为时间 
         Date date = TimeTest.strToDate(sdate); 
         Calendar c = Calendar.getInstance(); 
         c.setTime(date); 
         return new SimpleDateFormat("EEEE").format(c.getTime()); 
     } 
  
     /**
         * 将短时间格式字符串转换为时间 yyyy-MM-dd 
         * 
         * @param strDate
         * @return
         */ 
     public static Date strToDate(String strDate) { 
         SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); 
         ParsePosition pos = new ParsePosition(0); 
         Date strtodate = formatter.parse(strDate, pos); 
         return strtodate; 
     } 
  
     /**
         * 两个时间之间的天数
         * 
         * @param date1
         * @param date2
         * @return
         */ 
     public static long getDays(String date1, String date2) { 
         if (date1 == null || date1.equals("")) 
          return 0; 
         if (date2 == null || date2.equals("")) 
          return 0; 
         // 转换为标准时间 
         SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); 
         java.util.Date date = null; 
         java.util.Date mydate = null; 
         try { 
          date = myFormatter.parse(date1); 
          mydate = myFormatter.parse(date2); 
         } catch (Exception e) { 
         } 
         long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); 
         return day; 
     } 
  
  
  
      
     // 计算当月最后一天,返回字符串 
     public String getDefaultDay(){   
        String str = ""; 
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
  
        Calendar lastDate = Calendar.getInstance(); 
        lastDate.set(Calendar.DATE,1);//设为当前月的1号 
        lastDate.add(Calendar.MONTH,1);//加一个月，变为下月的1号 
        lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天 
         
        str=sdf.format(lastDate.getTime()); 
        return str;   
     } 
      
     // 上月第一天 
     public String getPreviousMonthFirst(){   
        String str = ""; 
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
  
        Calendar lastDate = Calendar.getInstance(); 
        lastDate.set(Calendar.DATE,1);//设为当前月的1号 
        lastDate.add(Calendar.MONTH,-1);//减一个月，变为下月的1号 
         str=sdf.format(lastDate.getTime()); 
        return str;   
     } 
      
     //获取当月第一天 
     public String getFirstDayOfMonth(){   
        String str = ""; 
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
  
        Calendar lastDate = Calendar.getInstance(); 
        lastDate.set(Calendar.DATE,1);//设为当前月的1号 
        str=sdf.format(lastDate.getTime()); 
        return str;   
     } 
      
     // 获得本周星期日的日期   
     public String getCurrentWeekday() { 
         weeks = 0; 
         int mondayPlus = this.getMondayPlus(); 
         GregorianCalendar currentDate = new GregorianCalendar(); 
         currentDate.add(GregorianCalendar.DATE, mondayPlus+6); 
         Date monday = currentDate.getTime(); 
          
         DateFormat df = DateFormat.getDateInstance(); 
         String preMonday = df.format(monday); 
         return preMonday; 
     } 
      
      
     //获取当天时间  
     public String getNowTime(String dateformat){ 
         Date   now   =   new   Date();    
         SimpleDateFormat   dateFormat   =   new   SimpleDateFormat(dateformat);//可以方便地修改日期格式    
         String  hehe  = dateFormat.format(now);    
         return hehe; 
     } 
      
     // 获得当前日期与本周日相差的天数 
     private int getMondayPlus() { 
         Calendar cd = Calendar.getInstance(); 
         // 获得今天是一周的第几天，星期日是第一天，星期二是第二天...... 
         int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK)-1;         //因为按中国礼拜一作为第一天所以这里减1 
         System.out.println("相差天数:"+dayOfWeek); 
         if (dayOfWeek == 1) { 
             return 0; 
         } else { 
             return 1 - dayOfWeek; 
         } 
     } 
      
     //获得本周一的日期 
     public String getMondayOFWeek(){ 
          weeks = 0; 
          int mondayPlus = this.getMondayPlus(); 
          GregorianCalendar currentDate = new GregorianCalendar(); 
          currentDate.add(GregorianCalendar.DATE, mondayPlus); 
          Date monday = currentDate.getTime(); 
           
          DateFormat df = DateFormat.getDateInstance(); 
          String preMonday = df.format(monday); 
          return preMonday; 
     } 
      
   //获得相应周的周六的日期 
     public String getSaturday() { 
         int mondayPlus = this.getMondayPlus(); 
         GregorianCalendar currentDate = new GregorianCalendar(); 
         currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6); 
         Date monday = currentDate.getTime(); 
         DateFormat df = DateFormat.getDateInstance(); 
         String preMonday = df.format(monday); 
         return preMonday; 
     } 
      
  // 获得上周星期日的日期 
     public String getPreviousWeekSunday() { 
         weeks=0; 
         weeks--; 
         int mondayPlus = this.getMondayPlus(); 
         GregorianCalendar currentDate = new GregorianCalendar(); 
         currentDate.add(GregorianCalendar.DATE, mondayPlus+weeks); 
         Date monday = currentDate.getTime(); 
         DateFormat df = DateFormat.getDateInstance(); 
         String preMonday = df.format(monday); 
         return preMonday; 
     } 
  
  // 获得上周星期一的日期 
     public String getPreviousWeekday() { 
         weeks--; 
         int mondayPlus = this.getMondayPlus(); 
         GregorianCalendar currentDate = new GregorianCalendar(); 
         currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks); 
         Date monday = currentDate.getTime(); 
         DateFormat df = DateFormat.getDateInstance(); 
         String preMonday = df.format(monday); 
         return preMonday; 
     } 
      
     // 获得下周星期一的日期 
     public String getNextMonday() { 
         weeks++; 
         int mondayPlus = this.getMondayPlus(); 
         GregorianCalendar currentDate = new GregorianCalendar(); 
         currentDate.add(GregorianCalendar.DATE, mondayPlus + 7); 
         Date monday = currentDate.getTime(); 
         DateFormat df = DateFormat.getDateInstance(); 
         String preMonday = df.format(monday); 
         return preMonday; 
     } 
      
  // 获得下周星期日的日期 
     public String getNextSunday() { 
          
         int mondayPlus = this.getMondayPlus(); 
         GregorianCalendar currentDate = new GregorianCalendar(); 
         currentDate.add(GregorianCalendar.DATE, mondayPlus + 7+6); 
         Date monday = currentDate.getTime(); 
         DateFormat df = DateFormat.getDateInstance(); 
         String preMonday = df.format(monday); 
         return preMonday; 
     } 
      
      
      
     private int getMonthPlus(){ 
         Calendar cd = Calendar.getInstance(); 
         int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH); 
         cd.set(Calendar.DATE, 1);//把日期设置为当月第一天  
         cd.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天  
         MaxDate=cd.get(Calendar.DATE);  
         if(monthOfNumber == 1){ 
             return -MaxDate; 
         }else{ 
             return 1-monthOfNumber; 
         } 
     } 
      
   //获得上月最后一天的日期 
     public String getPreviousMonthEnd(){ 
         String str = ""; 
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
  
        Calendar lastDate = Calendar.getInstance(); 
       lastDate.add(Calendar.MONTH,-1);//减一个月 
       lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天  
       lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天  
        str=sdf.format(lastDate.getTime()); 
        return str;   
     } 
      
   //获得下个月第一天的日期 
     public String getNextMonthFirst(){ 
         String str = ""; 
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
  
        Calendar lastDate = Calendar.getInstance(); 
       lastDate.add(Calendar.MONTH,1);//减一个月 
       lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天  
        str=sdf.format(lastDate.getTime()); 
        return str;   
     } 
      
   //获得下个月最后一天的日期 
     public String getNextMonthEnd(){ 
         String str = ""; 
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
  
        Calendar lastDate = Calendar.getInstance(); 
       lastDate.add(Calendar.MONTH,1);//加一个月 
       lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天  
       lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天  
        str=sdf.format(lastDate.getTime()); 
        return str;   
     } 
      
     //获得明年最后一天的日期 
     public String getNextYearEnd(){ 
         String str = ""; 
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
  
       Calendar lastDate = Calendar.getInstance(); 
       lastDate.add(Calendar.YEAR,1);//加一个月 
      lastDate.set(Calendar.DATE,1);//把日期设置为当月第一天  
       lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天  
        str=sdf.format(lastDate.getTime()); 
        return str;   
     } 
      
   //获得明年第一天的日期 
     public String getNextYearFirst(){ 
         String str = ""; 
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
  
        Calendar lastDate = Calendar.getInstance(); 
       lastDate.add(Calendar.YEAR,1);//加一年 
       lastDate.set(Calendar.MONTH,1);//把日期设置为当年第一月  
      lastDate.set(Calendar.DATE,1);//把日期设置为当月第一天  
        str=sdf.format(lastDate.getTime()); 
        return str;   
     } 
      
     private int getYearPlus(){ 
         Calendar cd = Calendar.getInstance(); 
         int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);//获得当天是一年中的第几天 
         cd.set(Calendar.DAY_OF_YEAR,1);//把日期设为当年第一天 
         cd.roll(Calendar.DAY_OF_YEAR,-1);//把日期回滚一天。 
         int MaxYear = cd.get(Calendar.DAY_OF_YEAR); 
         if(yearOfNumber == 1){ 
             return -MaxYear; 
         }else{ 
             return 1-yearOfNumber; 
         } 
     } 
   //获得本年第一天的日期 
     public String getCurrentYearFirst(){ 
         int yearPlus = this.getYearPlus(); 
         GregorianCalendar currentDate = new GregorianCalendar(); 
         currentDate.add(GregorianCalendar.DATE,yearPlus); 
         Date yearDay = currentDate.getTime(); 
         DateFormat df = DateFormat.getDateInstance(); 
         String preYearDay = df.format(yearDay); 
         return preYearDay; 
     } 
      
      
   //获得本年最后一天的日期 * 
     public String getCurrentYearEnd(){ 
         Date date = new Date(); 
         SimpleDateFormat   dateFormat   =   new   SimpleDateFormat("yyyy");//可以方便地修改日期格式    
         String  years  = dateFormat.format(date);    
         return years+"-12-31"; 
     } 
      
      
   //获得上年第一天的日期 * 
     public String getPreviousYearFirst(){ 
         Date date = new Date(); 
         SimpleDateFormat   dateFormat   =   new   SimpleDateFormat("yyyy");//可以方便地修改日期格式    
         String  years  = dateFormat.format(date); int years_value = Integer.parseInt(years);   
         years_value--; 
         return years_value+"-1-1"; 
     } 
      
   //获得上年最后一天的日期 
     public String getPreviousYearEnd(){ 
         weeks--; 
         int yearPlus = this.getYearPlus(); 
         GregorianCalendar currentDate = new GregorianCalendar(); 
         currentDate.add(GregorianCalendar.DATE,yearPlus+MaxYear*weeks+(MaxYear-1)); 
         Date yearDay = currentDate.getTime(); 
         DateFormat df = DateFormat.getDateInstance(); 
         String preYearDay = df.format(yearDay); 
         getThisSeasonTime(11); 
         return preYearDay; 
     } 
      
   //获得本季度 
     public String getThisSeasonTime(int month){ 
         int array[][] = {{1,2,3},{4,5,6},{7,8,9},{10,11,12}}; 
         int season = 1; 
         if(month>=1&&month<=3){ 
             season = 1; 
         } 
         if(month>=4&&month<=6){ 
             season = 2; 
         } 
         if(month>=7&&month<=9){ 
             season = 3; 
         } 
         if(month>=10&&month<=12){ 
             season = 4; 
         } 
         int start_month = array[season-1][0]; 
         int end_month = array[season-1][2]; 
          
         Date date = new Date(); 
         SimpleDateFormat   dateFormat   =   new   SimpleDateFormat("yyyy");//可以方便地修改日期格式    
         String  years  = dateFormat.format(date);    
         int years_value = Integer.parseInt(years); 
          
         int start_days =1;//years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month); 
         int end_days = getLastDayOfMonth(years_value,end_month); 
         String seasonDate = years_value+"-"+start_month+"-"+start_days+";"+years_value+"-"+end_month+"-"+end_days; 
         return seasonDate; 
          
     } 
      
     /**
      * 获取某年某月的最后一天
      * @param year 年
      * @param month 月
      * @return 最后一天
      */ 
    private int getLastDayOfMonth(int year, int month) { 
          if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 
                    || month == 10 || month == 12) { 
                return 31; 
          } 
          if (month == 4 || month == 6 || month == 9 || month == 11) { 
                return 30; 
          } 
          if (month == 2) { 
                if (isLeapYear(year)) { 
                    return 29; 
                } else { 
                    return 28; 
                } 
          } 
          return 0; 
    } 
    /**
     * 是否闰年
     * @param year 年
     * @return 
     */ 
   public boolean isLeapYear(int year) { 
         return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0); 
   } 
 }