java獲取時間整點工具代碼

　　/**獲取上n個小時整點小時時間
     * @param date
     * @return
     */
    public static String getLastHourTime(Date date,int n){
        Calendar ca = Calendar.getInstance();
        ca.set(Calendar.MINUTE, 0);
        ca.set(Calendar.SECOND, 0);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        ca.set(Calendar.HOUR_OF_DAY, ca.get(Calendar.HOUR_OF_DAY)-n);
        date = ca.getTime();
        return sdf.format(date);
    }
    /**獲取當前時間的整點小時時間
     * @param date
     * @return
     */
    public static String getCurrHourTime(Date date){
        Calendar ca = Calendar.getInstance();
        ca.set(Calendar.MINUTE, 0);
        ca.set(Calendar.SECOND, 0);
        date = ca.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        return sdf.format(date);
    }