/**

* 某一个月第一天和最后一天

*

* @param date 指定日期

* @param pattern 日期格式

* @param isNeedHms是否需要时分秒

* @return

*/

public static Map getFirstLastDayByMonth(Date date,

String pattern, boolean isNeedHms) {

SimpleDateFormat df = new SimpleDateFormat(pattern);

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

Date theDate = calendar.getTime();

// 第一天

GregorianCalendar gcLast = (GregorianCalendar) Calendar.getInstance();

gcLast.setTime(theDate);

gcLast.set(Calendar.DAY_OF_MONTH, 1);

String day_first = df.format(gcLast.getTime());

StringBuffer str = new StringBuffer().append(day_first);

if (isNeedHms)

str.append(" 00:00:00");

day_first = str.toString();

// 最后一天

calendar.add(Calendar.MONTH, 1); // 加一个月

calendar.set(Calendar.DATE, 1); // 设置为该月第一天

calendar.add(Calendar.DATE, -1); // 再减一天即为上个月最后一天

String day_last = df.format(calendar.getTime());

StringBuffer endStr = new StringBuffer().append(day_last);

if (isNeedHms)

endStr.append(" 23:59:59");

day_last = endStr.toString();

Map map = new HashMap();

map.put("first", day_first);

map.put("last", day_last);

return map;

}

/**

* 获取当前季度

*

*/

public static String getQuarter() {

Calendar c = Calendar.getInstance();

int month = c.get(c.MONTH) + 1;

int quarter = 0;

if (month >= 1 && month <= 3) {

quarter = 1;

} else if (month >= 4 && month <= 6) {

quarter = 2;

} else if (month >= 7 && month <= 9) {

quarter = 3;

} else {

quarter = 4;

}

return quarter + "";

}

/**

* 获取某季度的第一天和最后一天

*@param num第几季度

*/

public static String[] getCurrQuarter(int num) {

String[] s = new String[2];

String str = "";

// 设置本年的季

Calendar quarterCalendar = null;

switch (num) {

case 1: // 本年到现在经过了一个季度，在加上前4个季度

quarterCalendar = Calendar.getInstance();

quarterCalendar.set(Calendar.MONTH, 3);

quarterCalendar.set(Calendar.DATE, 1);

quarterCalendar.add(Calendar.DATE, -1);

str = DateUtils.formatDate(quarterCalendar.getTime(), "yyyy-MM-dd");

s[0] = str.substring(0, str.length() - 5) + "01-01";

s[1] = str;

break;

case 2: // 本年到现在经过了二个季度，在加上前三个季度

quarterCalendar = Calendar.getInstance();

quarterCalendar.set(Calendar.MONTH, 6);

quarterCalendar.set(Calendar.DATE, 1);

quarterCalendar.add(Calendar.DATE, -1);

str = DateUtils.formatDate(quarterCalendar.getTime(), "yyyy-MM-dd");

s[0] = str.substring(0, str.length() - 5) + "04-01";

s[1] = str;

break;

case 3:// 本年到现在经过了三个季度，在加上前二个季度

quarterCalendar = Calendar.getInstance();

quarterCalendar.set(Calendar.MONTH, 9);

quarterCalendar.set(Calendar.DATE, 1);

quarterCalendar.add(Calendar.DATE, -1);

str = DateUtils.formatDate(quarterCalendar.getTime(), "yyyy-MM-dd");

s[0] = str.substring(0, str.length() - 5) + "07-01";

s[1] = str;

break;

case 4:// 本年到现在经过了四个季度，在加上前一个季度

quarterCalendar = Calendar.getInstance();

str = DateUtils.formatDate(quarterCalendar.getTime(), "yyyy-MM-dd");

s[0] = str.substring(0, str.length() - 5) + "10-01";

s[1] = str.substring(0, str.length() - 5) + "12-31";

break;

}

return s;

}

/**

* 用途：以指定的格式格式化日期字符串

* @param pattern 字符串的格式

* @param currentDate 被格式化日期

* @return String 已格式化的日期字符串

* @throws NullPointerException 如果参数为空

*/

public static String formatDate(Date currentDate, String pattern){

if(currentDate == null || "".equals(pattern) || pattern == null){

return null;

}

SimpleDateFormat sdf = new SimpleDateFormat(pattern);

return sdf.format(currentDate);

}