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