工具类收集，不断更新中
/** * 判断字符串是否为空 * * @param str * @return */public static boolean isEmpty(final String str) {if (null == str || str.length() == 0) {return true;}return false;}/** * 截取指定长度的字符串,返回的字符串长度可能比指定的长度多6 * * @param str * @param length * @return */public static String truncateStr(final String str, final int length) {if (CommonUtil.isEmpty(str)) {return null;}return str.length() <= length ? str : str.substring(0, length)+ "......";}/** * 改变指定日期的天数 * * @param startDay * @param days * @return */public static Date calculateDate(final Date startDay, final int days) {final Calendar cal = Calendar.getInstance();cal.setTime(startDay);cal.add(Calendar.DAY_OF_YEAR, days);return cal.getTime();}/** * 返回指定日期样式的格式化字符串 * * @param milli * @param pattern * @return */public static String formatDate(final long milli, final String pattern) {final SimpleDateFormat sdf = new SimpleDateFormat(pattern);return sdf.format(new java.util.Date(milli));}public static String formatDate(final Date date, final String pattern) {final SimpleDateFormat sdf = new SimpleDateFormat(pattern);return sdf.format(date);}public static Date stringToDate(final String formatStr, final String pattern)throws ParseException {final SimpleDateFormat sdf = new SimpleDateFormat(pattern);return sdf.parse(formatStr);}public static java.sql.Timestamp getTimestamp(final long time) {final Timestamp timestamp = new Timestamp(time);return timestamp;}public static java.sql.Timestamp getTimestamp(final String formatStr,final String pattern) throws ParseException {final Date date = CommonUtil.stringToDate(formatStr, pattern);final Timestamp timestamp = new Timestamp(date.getTime());return timestamp;}/** * 查找指定字符串的个数，特殊字符串需要转义 * @param str * @param pattern * @return */public static int findStrToCount(String str,String pattern){int count = str.length() - str.replaceAll(pattern, "").length();return count;}?