public static Date stringToDate(String strDate) {

    // 注意：SimpleDateFormat构造函数的样式与strDate的样式必须相符

    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

    Date date=null;

    try {

       date = simpleDateFormat.parse(strDate);

    } catch (ParseException e) {

       e.printStackTrace();

    }

    return date;

}

public static Date longToDate(long longDate){

    return new Date(longDate);

}

/**

 * 获取当前星期几

 * @return 1,2,3,4,5,6,0

 */

public static int getCurrentWeekday(){

    Calendar cal = Calendar.getInstance();

    int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK)-1;//今天是星期几

    return dayOfWeek;

}

/**

 * 把日期格式化

 * @param dateformat 如:yyyy-MM-dd HH:mm:ss

 * @return

 */

public static String getFormatDate(Date date,String dateformat){

    SimpleDateFormat format = new SimpleDateFormat(dateformat);

    return  format.format(date);

}

/**

 * 判断某个时间是否在指定时间段之间

 * @param compareTime

 * @param beginTime

 * @param endTime

 * @return beginTime <= compareTime <= endTime : true; other: false;

 */

public static boolean timeCom(String compareTime,

String beginTime,String endTime){

    if(compareTime.compareTo(beginTime) >= 0 && compareTime.compareTo(endTime) <= 0){

       return true;

    }else{

       return false;

    }

}

/**

 * 获取当前时间

 * @param dateformat 如:yyyy-MM-dd HH:mm:ss

 * @return

 */

public static String getCurTime(String dateformat){

    Calendar calendar = new GregorianCalendar();

    Date date = calendar.getTime();

    SimpleDateFormat format = new SimpleDateFormat(dateformat);

    return  format.format(date);

}

/**

 * 获取今天之前/后的某一天

 * @param tip 正数表示之后，负数表示之前

 * @param dateformat 日期格式

 * @return

 */

public static String dateShortFormat(int tip,String dateformat){

      Calendar calendar = new GregorianCalendar();

      calendar.set(Calendar.DAY_OF_MONTH, calendar.get(Calendar.DAY_OF_MONTH)+tip);

      Date date = calendar.getTime();

      SimpleDateFormat format = new SimpleDateFormat(dateformat);

      String dateInfo =  format.format(date);

      return dateInfo;

}