Java各种获取系统当前时间方法 和 格式

/** * 返回当前日期时间字符串<br> * 默认格式:yyyy-mm-dd hh:mm:ss *  * @return String 返回当前字符串型日期时间 */public static String getCurrentTime() {String returnStr = null;SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date date = new Date();returnStr = f.format(date);return returnStr;}/** * 返回当前日期时间字符串<br> * 默认格式:yyyymmddhhmmss *  * @return String 返回当前字符串型日期时间 */public static BigDecimal getCurrentTimeAsNumber() {String returnStr = null;SimpleDateFormat f = new SimpleDateFormat("yyyyMMddHHmmss");Date date = new Date();returnStr = f.format(date);return new BigDecimal(returnStr);}/** * 返回自定义格式的当前日期时间字符串 *  * @param format *            格式规则 * @return String 返回当前字符串型日期时间 */public static String getCurrentTime(String format) {String returnStr = null;SimpleDateFormat f = new SimpleDateFormat(format);Date date = new Date();returnStr = f.format(date);return returnStr;}/** * 返回当前字符串型日期 *  * @return String 返回的字符串型日期 */public static String getCurDate() {Calendar calendar = Calendar.getInstance();SimpleDateFormat simpledateformat = new SimpleDateFormat("yyyy-MM-dd");String strDate = simpledateformat.format(calendar.getTime());return strDate;}/** * 返回指定格式的字符型日期 * @param date * @param formatString * @return */public static String Date2String(Date date, String formatString) {if (G4Utils.isEmpty(date)) {return null;}SimpleDateFormat simpledateformat = new SimpleDateFormat(formatString);String strDate = simpledateformat.format(date);return strDate;}/** * 返回当前字符串型日期 *  * @param format *            格式规则 *  * @return String 返回的字符串型日期 */public static String getCurDate(String format) {Calendar calendar = Calendar.getInstance();SimpleDateFormat simpledateformat = new SimpleDateFormat(format);String strDate = simpledateformat.format(calendar.getTime());return strDate;}/** * 返回TimeStamp对象 *  * @return */public static Timestamp getCurrentTimestamp() {Object obj = TypeCaseHelper.convert(getCurrentTime(), "Timestamp", "yyyy-MM-dd HH:mm:ss");if (obj != null)return (Timestamp) obj;elsereturn null;}/** * 将字符串型日期转换为日期型 *  * @param strDate *            字符串型日期 * @param srcDateFormat *            源日期格式 * @param dstDateFormat *            目标日期格式 * @return Date 返回的util.Date型日期 */public static Date stringToDate(String strDate, String srcDateFormat, String dstDateFormat) {Date rtDate = null;Date tmpDate = (new SimpleDateFormat(srcDateFormat)).parse(strDate, new ParsePosition(0));String tmpString = null;if (tmpDate != null)tmpString = (new SimpleDateFormat(dstDateFormat)).format(tmpDate);if (tmpString != null)rtDate = (new SimpleDateFormat(dstDateFormat)).parse(tmpString, new ParsePosition(0));return rtDate;}