java获取当前年、半年、季度、月、日、小时 开始结束时间等

ps:代码有参考别人的,非全部原创。已在正式项目上使用 


import java.text.SimpleDateFormat; 
import java.util.Calendar; 
import java.util.Date; 

/** 
* 获取  当前年、半年、季度、月、日、小时 开始结束时间 
*/ 
private final SimpleDateFormat shortSdf; 
    private final SimpleDateFormat longHourSdf; 
    private final SimpleDateFormat longSdf; 
    
    public RemindDateUtils(){ 
        this.shortSdf = new SimpleDateFormat("yyyy-MM-dd"); 
        this.longHourSdf = new SimpleDateFormat("yyyy-MM-dd HH"); 
        this.longSdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
    } 
    
    /** 
     * 获得本周的第一天，周一 
     * 
     * @return 
     */ 
    public   Date getCurrentWeekDayStartTime() { 
        Calendar c = Calendar.getInstance(); 
        try { 
            int weekday = c.get(Calendar.DAY_OF_WEEK) - 2; 
            c.add(Calendar.DATE, -weekday); 
            c.setTime(longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00")); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return c.getTime(); 
    } 

    /** 
     * 获得本周的最后一天，周日 
     * 
     * @return 
     */ 
    public   Date getCurrentWeekDayEndTime() { 
        Calendar c = Calendar.getInstance(); 
        try { 
            int weekday = c.get(Calendar.DAY_OF_WEEK); 
            c.add(Calendar.DATE, 8 - weekday); 
            c.setTime(longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59")); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return c.getTime(); 
    } 

    /** 
     * 获得本天的开始时间，即2012-01-01 00:00:00 
     * 
     * @return 
     */ 
    public   Date getCurrentDayStartTime() { 
        Date now = new Date(); 
        try { 
            now = shortSdf.parse(shortSdf.format(now)); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 

    /** 
     * 获得本天的结束时间，即2012-01-01 23:59:59 
     * 
     * @return 
     */ 
    public   Date getCurrentDayEndTime() { 
        Date now = new Date(); 
        try { 
            now = longSdf.parse(shortSdf.format(now) + " 23:59:59"); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 

    /** 
     * 获得本小时的开始时间，即2012-01-01 23:59:59 
     * 
     * @return 
     */ 
    public   Date getCurrentHourStartTime() { 
        Date now = new Date(); 
        try { 
            now = longHourSdf.parse(longHourSdf.format(now)); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 

    /** 
     * 获得本小时的结束时间，即2012-01-01 23:59:59 
     * 
     * @return 
     */ 
    public   Date getCurrentHourEndTime() { 
        Date now = new Date(); 
        try { 
            now = longSdf.parse(longHourSdf.format(now) + ":59:59"); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 

    /** 
     * 获得本月的开始时间，即2012-01-01 00:00:00 
     * 
     * @return 
     */ 
    public   Date getCurrentMonthStartTime() { 
        Calendar c = Calendar.getInstance(); 
        Date now = null; 
        try { 
            c.set(Calendar.DATE, 1); 
            now = shortSdf.parse(shortSdf.format(c.getTime())); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 

    /** 
     * 当前月的结束时间，即2012-01-31 23:59:59 
     * 
     * @return 
     */ 
    public   Date getCurrentMonthEndTime() { 
        Calendar c = Calendar.getInstance(); 
        Date now = null; 
        try { 
            c.set(Calendar.DATE, 1); 
            c.add(Calendar.MONTH, 1); 
            c.add(Calendar.DATE, -1); 
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59"); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 

    /** 
     * 当前年的开始时间，即2012-01-01 00:00:00 
     * 
     * @return 
     */ 
    public   Date getCurrentYearStartTime() { 
        Calendar c = Calendar.getInstance(); 
        Date now = null; 
        try { 
            c.set(Calendar.MONTH, 0); 
            c.set(Calendar.DATE, 1); 
            now = shortSdf.parse(shortSdf.format(c.getTime())); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 

    /** 
     * 当前年的结束时间，即2012-12-31 23:59:59 
     * 
     * @return 
     */ 
    public   Date getCurrentYearEndTime() { 
        Calendar c = Calendar.getInstance(); 
        Date now = null; 
        try { 
            c.set(Calendar.MONTH, 11); 
            c.set(Calendar.DATE, 31); 
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59"); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 

    /** 
     * 当前季度的开始时间，即2012-01-1 00:00:00 
     * 
     * @return 
     */ 
    public   Date getCurrentQuarterStartTime() { 
        Calendar c = Calendar.getInstance(); 
        int currentMonth = c.get(Calendar.MONTH) + 1; 
        Date now = null; 
        try { 
            if (currentMonth >= 1 && currentMonth <= 3) 
                c.set(Calendar.MONTH, 0); 
            else if (currentMonth >= 4 && currentMonth <= 6) 
                c.set(Calendar.MONTH, 3); 
            else if (currentMonth >= 7 && currentMonth <= 9) 
                c.set(Calendar.MONTH, 4); 
            else if (currentMonth >= 10 && currentMonth <= 12) 
                c.set(Calendar.MONTH, 9); 
            c.set(Calendar.DATE, 1); 
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00"); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 

    /** 
     * 当前季度的结束时间，即2012-03-31 23:59:59 
     * 
     * @return 
     */ 
    public   Date getCurrentQuarterEndTime() { 
        Calendar c = Calendar.getInstance(); 
        int currentMonth = c.get(Calendar.MONTH) + 1; 
        Date now = null; 
        try { 
            if (currentMonth >= 1 && currentMonth <= 3) { 
                c.set(Calendar.MONTH, 2); 
                c.set(Calendar.DATE, 31); 
            } else if (currentMonth >= 4 && currentMonth <= 6) { 
                c.set(Calendar.MONTH, 5); 
                c.set(Calendar.DATE, 30); 
            } else if (currentMonth >= 7 && currentMonth <= 9) { 
                c.set(Calendar.MONTH,; 
                c.set(Calendar.DATE, 30); 
            } else if (currentMonth >= 10 && currentMonth <= 12) { 
                c.set(Calendar.MONTH, 11); 
                c.set(Calendar.DATE, 31); 
            } 
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59"); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 
    /** 
     * 获取前/后半年的开始时间 
     * @return 
     */ 
    public   Date getHalfYearStartTime(){ 
        Calendar c = Calendar.getInstance(); 
        int currentMonth = c.get(Calendar.MONTH) + 1; 
        Date now = null; 
        try { 
            if (currentMonth >= 1 && currentMonth <= 6){ 
                c.set(Calendar.MONTH, 0); 
            }else if (currentMonth >= 7 && currentMonth <= 12){ 
                c.set(Calendar.MONTH, 6); 
            } 
            c.set(Calendar.DATE, 1); 
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00"); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
        
    } 
    /** 
     * 获取前/后半年的结束时间 
     * @return 
     */ 
    public   Date getHalfYearEndTime(){ 
        Calendar c = Calendar.getInstance(); 
        int currentMonth = c.get(Calendar.MONTH) + 1; 
        Date now = null; 
        try { 
            if (currentMonth >= 1 && currentMonth <= 6){ 
                c.set(Calendar.MONTH, 5); 
                c.set(Calendar.DATE, 30); 
            }else if (currentMonth >= 7 && currentMonth <= 12){ 
                c.set(Calendar.MONTH, 11); 
                c.set(Calendar.DATE, 31); 
            } 
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59"); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return now; 
    } 
    
    

} 


/** 
  * 获取前一天日期 及星期 
  */ 
public class RemindDateUtils { 
    private void initDate(){ 
        String[] weekDays = {"周日","周一","周二","周三","周四","周五","周六"}; 
         Calendar cal = Calendar.getInstance(); 
         cal.add(Calendar.Date,-1); 
         int i = cal.get(Calendar.DAY_OF_WEEK)-1; 
         if(i<0){ 
            i=0; 
        } 
        String yesterday = new SimpleDateFormate("yyyy年MM月dd日").format(cal.getTime()); 
　　　　 String w = weekDays[i]; 
    } 
      
}   

PS:SimpleDateFormat是线程不安全的