时间处理类

public class DateUtil 

{ 

 //默认显示日期的格式 

 public static final String DATAFORMAT_STR = "yyyy-MM-dd"; 


 //默认显示日期的格式 

 public static final String YYYY_MM_DATAFORMAT_STR = "yyyy-MM"; 


 //默认显示日期时间的格式 

 public static final String DATATIMEF_STR = "yyyy-MM-dd HH:mm:ss"; 


 //默认显示简体中文日期的格式 

 public static final String ZHCN_DATAFORMAT_STR = "yyyy年MM月dd日"; 


 //默认显示简体中文日期时间的格式 

 public static final String ZHCN_DATATIMEF_STR = "yyyy年MM月dd日HH时mm分ss秒"; 


 //默认显示简体中文日期时间的格式 

 public static final String ZHCN_DATATIMEF_STR_4yMMddHHmm = "yyyy年MM月dd日HH时mm分"; 


 private static DateFormat dateFormat = null; 


 private static DateFormat dateTimeFormat = null; 


 private static DateFormat zhcnDateFormat = null; 


 private static DateFormat zhcnDateTimeFormat = null; 

 static 

 { 

 dateFormat = new SimpleDateFormat(DATAFORMAT_STR); 

 dateTimeFormat = new SimpleDateFormat(DATATIMEF_STR); 

 zhcnDateFormat = new SimpleDateFormat(ZHCN_DATAFORMAT_STR); 

 zhcnDateTimeFormat = new SimpleDateFormat(ZHCN_DATATIMEF_STR); 

 } 


 private static DateFormat getDateFormat(String formatStr) 

 { 

 if (formatStr.equalsIgnoreCase(DATAFORMAT_STR)) 

 { 

 return dateFormat; 

 } 

 else 

 if (formatStr.equalsIgnoreCase(DATATIMEF_STR)) 

 { 

 return dateTimeFormat; 

 } 

 else 

 if (formatStr.equalsIgnoreCase(ZHCN_DATAFORMAT_STR)) 

 { 

 return zhcnDateFormat; 

 } 

 else 

 if (formatStr.equalsIgnoreCase(ZHCN_DATATIMEF_STR)) 

 { 

 return zhcnDateTimeFormat; 

 } 

 else 

 { 

 return new SimpleDateFormat(formatStr); 

 } 

 } 


 /** 

 * 按照默认显示日期时间的格式"yyyy-MM-dd HH:mm:ss"，转化dateTimeStr为Date类型 

 * dateTimeStr必须是"yyyy-MM-dd HH:mm:ss"的形式 

 * @param dateTimeStr 

 * @return 

 */ 

 public static Date getDate(String dateTimeStr) 

 { 

 return getDate(dateTimeStr, DATATIMEF_STR); 

 } 


 /** 

 * 按照默认formatStr的格式，转化dateTimeStr为Date类型 

 * dateTimeStr必须是formatStr的形式 

 * @param dateTimeStr 

 * @param formatStr 

 * @return 

 */ 

 public static Date getDate(String dateTimeStr, String formatStr) 

 { 

 try 

 { 

 if (dateTimeStr == null || dateTimeStr.equals("")) 

 { 

 return null; 

 } 

 DateFormat sdf = getDateFormat(formatStr); 

 java.util.Date d = sdf.parse(dateTimeStr); 

 return d; 

 } 

 catch (ParseException e) 

 { 

 throw new RuntimeException(e); 

 } 

 } 


 /** 

 * 将YYYYMMDD转换成Date日期 

 * @param date 

 * @return 

 * @throws BusinessException 

 */ 

 public static Date transferDate(String date) throws Exception 

 { 

 if (date == null || date.length() < 1) 

 return null; 


 if (date.length() != 8) 

 throw new Exception("日期格式错误"); 

 String con = "-"; 


 String yyyy = date.substring(0, 4); 

 String mm = date.substring(4, 6); 

 String dd = date.substring(6, 8); 


 int month = Integer.parseInt(mm); 

 int day = Integer.parseInt(dd); 

 if (month < 1 || month > 12 || day < 1 || day > 31) 

 throw new Exception("日期格式错误"); 


 String str = yyyy + con + mm + con + dd; 

 return DateUtil.getDate(str, DateUtil.DATAFORMAT_STR); 

 } 


 /** 

 * 将YYYY－MM－DD日期转换成yyyymmdd格式字符串 

 * @param date 

 * @return 

 */ 

 public static String getYYYYMMDDDate(Date date) 

 { 

 if (date == null) 

 return null; 

 String yyyy = getYear(date) + ""; 

 String mm = getMonth(date) + ""; 

 String dd = getDay(date) + ""; 


 mm = StringUtil.rightAlign(mm, 2, "0"); 

 dd = StringUtil.rightAlign(dd, 2, "0"); 

 return yyyy + mm + dd; 

 } 


 /** 

 * 将YYYY－MM－DD日期转换成YYYYMMDDHHMMSS格式字符串 

 * @param date 

 * @return 

 */ 

 public static String getYYYYMMDDHHMMSSDate(Date date) 

 { 

 if (date == null) 

 return null; 

 String yyyy = getYear(date) + ""; 

 String mm = getMonth(date) + ""; 

 String dd = getDay(date) + ""; 

 String hh = getHour(date) + ""; 

 String min = getMin(date) + ""; 

 String ss = getSecond(date) + ""; 


 mm = StringUtil.rightAlign(mm, 2, "0"); 

 dd = StringUtil.rightAlign(dd, 2, "0"); 

 hh = StringUtil.rightAlign(hh, 2, "0"); 

 min = StringUtil.rightAlign(min, 2, "0"); 

 ss = StringUtil.rightAlign(ss, 2, "0"); 


 return yyyy + mm + dd + hh + min + ss; 

 } 


 /** 

 * 将YYYY－MM－DD日期转换成yyyymmdd格式字符串 

 * @param date 

 * @return 

 */ 

 public static String getYYYYMMDDDate(String date) 

 { 

 return getYYYYMMDDDate(getDate(date, DATAFORMAT_STR)); 

 } 


 /** 

 * 将Date转换成字符串“yyyy-mm-dd hh:mm:ss”的字符串 

 * @param date 

 * @return 

 */ 

 public static String dateToDateString(Date date) 

 { 

 return dateToDateString(date, DATATIMEF_STR); 

 } 


 /** 

 * 将Date转换成formatStr格式的字符串 

 * @param date 

 * @param formatStr 

 * @return 

 */ 

 public static String dateToDateString(Date date, String formatStr) 

 { 

 DateFormat df = getDateFormat(formatStr); 

 return df.format(date); 

 } 


 /** 

 * 返回一个yyyy-MM-dd HH:mm:ss 形式的日期时间字符串中的HH:mm:ss 

 * @param dateTime 

 * @return 

 */ 

 public static String getTimeString(String dateTime) 

 { 

 return getTimeString(dateTime, DATATIMEF_STR); 

 } 


 /** 

 * 返回一个formatStr格式的日期时间字符串中的HH:mm:ss 

 * @param dateTime 

 * @param formatStr 

 * @return 

 */ 

 public static String getTimeString(String dateTime, String formatStr) 

 { 

 Date d = getDate(dateTime, formatStr); 

 String s = dateToDateString(d); 

 return s.substring(DATATIMEF_STR.indexOf('H')); 

 } 


 /** 

 * 获取当前日期yyyy-MM-dd的形式 

 * @return 

 */ 

 public static String getCurDate() 

 { 

 //return dateToDateString(new Date(),DATAFORMAT_STR); 

 return dateToDateString(Calendar.getInstance().getTime(), DATAFORMAT_STR); 

 } 


 /** 

 * 获取当前日期yyyy年MM月dd日的形式 

 * @return 

 */ 

 public static String getCurZhCNDate() 

 { 

 return dateToDateString(new Date(), ZHCN_DATAFORMAT_STR); 

 } 


 /** 

 * 获取当前日期时间yyyy-MM-dd HH:mm:ss的形式 

 * @return 

 */ 

 public static String getCurDateTime() 

 { 

 return dateToDateString(new Date(), DATATIMEF_STR); 

 } 


 /** 

 * 获取当前日期时间yyyy年MM月dd日HH时mm分ss秒的形式 

 * @return 

 */ 

 public static String getCurZhCNDateTime() 

 { 

 return dateToDateString(new Date(), ZHCN_DATATIMEF_STR); 

 } 


 /** 

 * 获取日期d的days天后的一个Date 

 * @param d 

 * @param days 

 * @return 

 */ 

 public static Date getInternalDateByDay(Date d, int days) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 now.add(Calendar.DATE, days); 

 return now.getTime(); 

 } 


 public static Date getInternalDateByMon(Date d, int months) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 now.add(Calendar.MONTH, months); 

 return now.getTime(); 

 } 


 public static Date getInternalDateByYear(Date d, int years) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 now.add(Calendar.YEAR, years); 

 return now.getTime(); 

 } 


 public static Date getInternalDateBySec(Date d, int sec) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 now.add(Calendar.SECOND, sec); 

 return now.getTime(); 

 } 


 public static Date getInternalDateByMin(Date d, int min) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 now.add(Calendar.MINUTE, min); 

 return now.getTime(); 

 } 


 public static Date getInternalDateByHour(Date d, int hours) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 now.add(Calendar.HOUR_OF_DAY, hours); 

 return now.getTime(); 

 } 


 /** 

 * 根据一个日期字符串，返回日期格式，目前支持4种 

 * 如果都不是，则返回null 

 * @param DateString 

 * @return 

 */ 

 public static String getFormateStr(String DateString) 

 { 

 String patternStr1 = "[0-9]{4}-[0-9]{1,2}-[0-9]{1,2}"; //"yyyy-MM-dd" 

 String patternStr2 = "[0-9]{4}-[0-9]{1,2}-[0-9]{1,2}\\s[0-9]{1,2}:[0-9]{1,2}:[0-9]{1,2}"; //"yyyy-MM-dd HH:mm:ss"; 

 String patternStr3 = "[0-9]{4}年[0-9]{1,2}月[0-9]{1,2}日";//"yyyy年MM月dd日" 

 String patternStr4 = "[0-9]{4}年[0-9]{1,2}月[0-9]{1,2}日[0-9]{1,2}时[0-9]{1,2}分[0-9]{1,2}秒";//"yyyy年MM月dd日HH时mm分ss秒" 


 Pattern p = Pattern.compile(patternStr1); 

 Matcher m = p.matcher(DateString); 

 boolean b = m.matches(); 

 if (b) 

 return DATAFORMAT_STR; 

 p = Pattern.compile(patternStr2); 

 m = p.matcher(DateString); 

 b = m.matches(); 

 if (b) 

 return DATATIMEF_STR; 


 p = Pattern.compile(patternStr3); 

 m = p.matcher(DateString); 

 b = m.matches(); 

 if (b) 

 return ZHCN_DATAFORMAT_STR; 


 p = Pattern.compile(patternStr4); 

 m = p.matcher(DateString); 

 b = m.matches(); 

 if (b) 

 return ZHCN_DATATIMEF_STR; 

 return null; 

 } 


 /** 

 * 将一个"yyyy-MM-dd HH:mm:ss"字符串，转换成"yyyy年MM月dd日HH时mm分ss秒"的字符串 

 * @param dateStr 

 * @return 

 */ 

 public static String getZhCNDateTime(String dateStr) 

 { 

 Date d = getDate(dateStr); 

 return dateToDateString(d, ZHCN_DATATIMEF_STR); 

 } 


 /** 

 * 将一个"yyyy-MM-dd"字符串，转换成"yyyy年MM月dd日"的字符串 

 * @param dateStr 

 * @return 

 */ 

 public static String getZhCNDate(String dateStr) 

 { 

 Date d = getDate(dateStr, DATAFORMAT_STR); 

 return dateToDateString(d, ZHCN_DATAFORMAT_STR); 

 } 


 /** 

 * 将dateStr从fmtFrom转换到fmtTo的格式 

 * @param dateStr 

 * @param fmtFrom 

 * @param fmtTo 

 * @return 

 */ 

 public static String getDateStr(String dateStr, String fmtFrom, String fmtTo) 

 { 

 Date d = getDate(dateStr, fmtFrom); 

 return dateToDateString(d, fmtTo); 

 } 


 /** 

 * 比较两个"yyyy-MM-dd HH:mm:ss"格式的日期，之间相差多少毫秒,time2-time1 

 * @param time1 

 * @param time2 

 * @return 

 */ 

 public static long compareDateStr(String time1, String time2) 

 { 

 Date d1 = getDate(time1); 

 Date d2 = getDate(time2); 

 return d2.getTime() - d1.getTime(); 

 } 


 /** 

 * 将小时数换算成返回以毫秒为单位的时间 

 * @param hours 

 * @return 

 */ 

 public static long getMicroSec(BigDecimal hours) 

 { 

 BigDecimal bd; 

 bd = hours.multiply(new BigDecimal(3600 * 1000)); 

 return bd.longValue(); 

 } 


 /** 

 * 获取Date中的分钟 

 * @param d 

 * @return 

 */ 

 public static int getMin(Date d) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 return now.get(Calendar.MINUTE); 

 } 


 /** 

 * 获取Date中的小时(24小时) 

 * @param d 

 * @return 

 */ 

 public static int getHour(Date d) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 return now.get(Calendar.HOUR_OF_DAY); 

 } 


 /** 

 * 获取Date中的秒 

 * @param d 

 * @return 

 */ 

 public static int getSecond(Date d) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 return now.get(Calendar.SECOND); 

 } 


 /** 

 * 获取xxxx-xx-xx的日 

 * @param d 

 * @return 

 */ 

 public static int getDay(Date d) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 return now.get(Calendar.DAY_OF_MONTH); 

 } 


 /** 

 * 获取月份，1-12月 

 * @param d 

 * @return 

 */ 

 public static int getMonth(Date d) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 return now.get(Calendar.MONTH) + 1; 

 } 


 /** 

 * 获取19xx,20xx形式的年 

 * @param d 

 * @return 

 */ 

 public static int getYear(Date d) 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 now.setTime(d); 

 return now.get(Calendar.YEAR); 

 } 


 /** 

 * 得到d的上个月的年份+月份,如200505 

 * @return 

 */ 

 public static String getYearMonthOfLastMon(Date d) 

 { 

 Date newdate = getInternalDateByMon(d, -1); 

 String year = String.valueOf(getYear(newdate)); 

 String month = String.valueOf(getMonth(newdate)); 

 return year + month; 

 } 


 /** 

 * 得到当前日期的年和月如200509 

 * @return String 

 */ 

 public static String getCurYearMonth() 

 { 

 Calendar now = Calendar.getInstance(TimeZone.getDefault()); 

 String DATE_FORMAT = "yyyyMM"; 

 java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(DATE_FORMAT); 

 sdf.setTimeZone(TimeZone.getDefault()); 

 return (sdf.format(now.getTime())); 

 } 


 public static Date getNextMonth(String year, String month) 

 { 

 String datestr = year + "-" + month + "-01"; 

 Date date = getDate(datestr, DATAFORMAT_STR); 

 return getInternalDateByMon(date, 1); 

 } 


 public static Date getLastMonth(String year, String month) 

 { 

 String datestr = year + "-" + month + "-01"; 

 Date date = getDate(datestr, DATAFORMAT_STR); 

 return getInternalDateByMon(date, -1); 

 } 


 /** 

 * 得到日期d，按照页面日期控件格式，如"2001-3-16" 

 * @param d 

 * @return 

 */ 

 public static String getSingleNumDate(Date d) 

 { 

 return dateToDateString(d, DATAFORMAT_STR); 

 } 


 /** 

 * 得到d半年前的日期,"yyyy-MM-dd" 

 * @param d 

 * @return 

 */ 

 public static String getHalfYearBeforeStr(Date d) 

 { 

 return dateToDateString(getInternalDateByMon(d, -6), DATAFORMAT_STR); 

 } 


 /** 

 * 得到当前日期D的月底的前/后若干天的时间,<0表示之前，>0表示之后 

 * @param d 

 * @param days 

 * @return 

 */ 

 public static String getInternalDateByLastDay(Date d, int days) 

 { 


 return dateToDateString(getInternalDateByDay(d, days), DATAFORMAT_STR); 

 } 


 /** 

 * 日期中的年月日相加 

 * @param field int 需要加的字段 年 月 日 

 * @param amount int 加多少 

 * @return String 

 */ 

 public static String addDate(int field, int amount) 

 { 

 int temp = 0; 

 if (field == 1) 

 { 

 temp = Calendar.YEAR; 

 } 

 if (field == 2) 

 { 

 temp = Calendar.MONTH; 

 } 

 if (field == 3) 

 { 

 temp = Calendar.DATE; 

 } 


 String Time = ""; 

 try 

 { 

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 

 Calendar cal = Calendar.getInstance(TimeZone.getDefault()); 

 cal.add(temp, amount); 

 Time = sdf.format(cal.getTime()); 

 return Time; 

 } 

 catch (Exception e) 

 { 

 e.printStackTrace(); 

 return null; 

 } 


 } 


 /** 

 * 获得系统当前月份的天数 

 * @return 

 */ 

 public static int getCurentMonthDay() 

 { 

 Date date = Calendar.getInstance().getTime(); 

 return getMonthDay(date); 

 } 


 /** 

 * 获得指定日期月份的天数 

 * @return 

 */ 

 public static int getMonthDay(Date date) 

 { 

 Calendar c = Calendar.getInstance(); 

 c.setTime(date); 

 return c.getActualMaximum(Calendar.DAY_OF_MONTH); 


 } 


 /** 

 * 获得指定日期月份的天数 yyyy-mm-dd 

 * @return 

 */ 

 public static int getMonthDay(String date) 

 { 

 Date strDate = getDate(date, DATAFORMAT_STR); 

 return getMonthDay(strDate); 


 } 


 public static String getStringDate(Calendar cal) 

 { 


 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); 

 return format.format(cal.getTime()); 

 } 


 /** 

 * @param args 

 */ 

 public static void main(String[] args) 

 { 

 // //System.out.print(DateUtil.getDate("04:04:04","HH:mm:ss")); 

 // System.out.print("\n"+DateUtil.getCurZhCNDateTime()); 

 // System.out.print("\n"+getFormateStr(DateUtil.getCurDate())); 

 // System.out.print("\n"+compareDateStr("1900-1-1 1:1:2","1900-1-1 1:1:3")); 

 // System.out.print("\n"+getDay(new Date())); 

 // System.out.print("\n"+getMonth(new Date())); 

 // System.out.print("\n"+getYear(new Date())); 

 // System.out.print("\n"+getMin(new Date())); 

 System.out.print("\n"+new Date().getSeconds()); 

 /*Date d1 = new Date(2007,11,30); 

 Date d2 = new Date(2007,12,1); 

 if(d2.compareTo(d1)>0){ 

 System.out.println("d2大于d1"); 

 }else{ 

 System.out.println("d2小于d1"); 

 }*/ 


 System.out.println(addDate(1, 1)); 

 System.out.println(addDate(2, 1)); 

 System.out.println(addDate(3, 1)); 


 System.out.println(getYYYYMMDDHHMMSSDate(new Date())); 


 System.out.println(getCurentMonthDay()); 


 } 


}