日期格式化工具类

public class DateUtil {
private static String pattern = "今天是yyyy-MM-dd E HH:mm:ss";
private static SimpleDateFormat patternDF = new SimpleDateFormat(pattern, Locale.CHINA);
private static final SimpleDateFormat MMdd = new SimpleDateFormat("MM/dd");
public static final SimpleDateFormat yyyyMMdd = new SimpleDateFormat("yyyy-MM-dd");
private static final SimpleDateFormat yyyyMMddNoSep = new SimpleDateFormat("yyyyMMdd");
private static final SimpleDateFormat HHmmss = new SimpleDateFormat("HH:mm:ss");
private static final SimpleDateFormat yyyyMMddHHmmss = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
private static final SimpleDateFormat yyyyMMddHHmmss2 = new SimpleDateFormat(
"yyyy-MM-dd HH:mm");
private static final SimpleDateFormat yyyyMMddHHmmssNoSep = new SimpleDateFormat(
"yyyyMMddHHmmss");
private static final SimpleDateFormat yyyyMMddHHmmssSSS=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");

private static final SimpleDateFormat yyyyMM = new SimpleDateFormat("yyyy-MM");
private static final SimpleDateFormat yyyyMMNoSep = new SimpleDateFormat("yyyyMM");
private static final SimpleDateFormat MS=new SimpleDateFormat("HH:mm:ss.S");

public static String makeCurrentDateTimeStr() {
return patternDF.format(getCurrentDate());
}

public static String formatDate(Date d) {
if (d == null)
return "";
return yyyyMMdd.format(d);
}

public static Date formatStrDate(String d) {
if (d == null)
return getCurrentDate();

Date date = null;
try {
date = yyyyMMdd.parse(d);
} catch (ParseException e) {
e.printStackTrace();
return getCurrentDate();
}
return date;
}

public static Date formatYMD(String d){
if (d == null)
return getCurrentDate();

Date date = null;
try {
date = yyyyMMddNoSep.parse(d);
} catch (ParseException e) {
e.printStackTrace();
return getCurrentDate();
}
return date;

}

public static Date formatStrDateTime(String d) {
if (StringUtil.isEmpty(d))
return getCurrentDate();

Date date = null;
try {
date = yyyyMMddHHmmss.parse(d);
} catch (ParseException e) {
e.printStackTrace();
return getCurrentDate();
}
return date;
}

public static Date formatStrDateTime2(String d) {
if ( StringUtil.isEmpty(d))
return getCurrentDate();

Date date = null;
try {
date = yyyyMMddHHmmss2.parse(d);
} catch (ParseException e) {
e.printStackTrace();
return getCurrentDate();
}
return date;
}

public static String formatDate(String strDate) {
if (strDate == null || strDate.trim().equals(""))
return StringUtil.EMPTY;
try {
return yyyyMMdd.format(yyyyMMdd.parse(strDate));
} catch (ParseException e) {
e.printStackTrace();
return StringUtil.EMPTY;
}
}

public static String formatTime(Date d) {
if (d == null)
return StringUtil.EMPTY;
return HHmmss.format(d);
}

public static String formatDateTimeStr(String strTime) {
Date date=null;
if (strTime == null || strTime.length() <= 0) {
return "";
}
try {
date = yyyyMMddHHmmss.parse(strTime);
return yyyyMMddHHmmss.format(date);
} catch (ParseException e) {
e.printStackTrace();
}
return "";
}

public static String formatDateTime(Date d) {
if (d == null)
return StringUtil.EMPTY;
return yyyyMMddHHmmss.format(d);
}

public static String formatDateTimeMS(Date d){
if (d == null)
return StringUtil.EMPTY;
return yyyyMMddHHmmssSSS.format(d);
}

public static Date formatDateTime(String strTime){
Date date=null;
if(StringUtil.isEmpty(strTime))
return date;

try {
date = yyyyMMddHHmmss.parse(strTime);
} catch (ParseException e) {
e.printStackTrace();
}

return date;
}
public static String formatDateTime2(Date d) {
if (d == null)
return StringUtil.EMPTY;
return yyyyMMddHHmmss2.format(d);
}
public static String formatDateTimeNoSep(Date d) {
if (d == null)
return StringUtil.EMPTY;
return yyyyMMddHHmmssNoSep.format(d);
}

public static String formatyyMM(Date d) {
if (d == null) {
return StringUtil.EMPTY;
}
return yyyyMM.format(d);
}

/**
* yyyyMMddHHmmss--->yyyyMMdd
*
* @param text
* @return
*/
public static String renderDate(String text) {
if (StringUtil.isEmpty(text)) {
return StringUtil.EMPTY;
}
int idx = text.indexOf(" ");
if (idx <= 0) {
return text;
}
return text.substring(0, idx).trim();
}

/**
* yyyyMMddHHmmss--->yyyyMMdd
*
* @param text
* @return
*/
public static String renderTime(String text) {
if (StringUtil.isEmpty(text)) {
return StringUtil.EMPTY;
}
int idx = text.indexOf(" ");
if (idx <= 0) {
return text;
}
return text.substring(idx).trim();
}

public static String formatNextMonthDate(String date) {
String strDate = "";
Date d = formatStrDate(date);
Date currentDate = d;
if (currentDate == null) {
Date nextMonth = new Date(getCurrentDate().getTime() + (24 * 60 * 60 * 1000));
strDate = formatDate(nextMonth);
} else {
Date nextMonth = new Date(currentDate.getTime() + (24 * 60 * 60 * 1000));
strDate = formatDate(nextMonth);
}
return strDate;
}

public static String formatPrevMonthDate(Date date) {
Calendar cal = Calendar.getInstance();
if (date != null) {
cal.setTimeInMillis(date.getTime());
}
cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) - 1);
String strTime = formatDate(new Date(cal.getTimeInMillis()));
return strTime.replace("-", "").substring(0, 6);
}

public static String formatTime(int seconds) {
String ret = "00:00:00";
if (seconds <= 0)
return ret;
int sec = seconds % 60;
int min = (seconds / 60) % 60;
int hr = seconds / 3600;
Calendar cal = Calendar.getInstance();
cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH),
hr, min, sec);
ret = String.format("%1$tH:%1$tM:%1$tS", new Date(cal.getTimeInMillis()));
return ret;
}

public static String formatYearMonth(Date date) {
String str = "";
if (date == null) {
str = yyyyMMNoSep.format(getCurrentDate());
} else {
str = yyyyMMNoSep.format(date);
}
return str;
}

public static String formatYearMonth() {
return formatYearMonth(null);
}

public static String formatYMD(Date date) {
String str = "";
if (date == null) {
str = yyyyMMddNoSep.format(getCurrentDate());
} else {
str = yyyyMMddNoSep.format(date);
}
str = str.replaceAll("-", "");
return str;
}

public static Date getCurrentDate() {
return new Date(System.currentTimeMillis());
}

public static long getCurrentTimeMills() {
return System.currentTimeMillis();
}

public static String formatMMDD(String date) {
try {
Date d = formatStrDate(date);
return MMdd.format(new Date(d.getTime()));
} catch (Exception e) {
return MMdd.format(new Date());
}
}

public static String[] getOneWeekDateLable() {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_MONTH, -7);
String[] dateArr = new String[7];
for (int i = 0; i < 7; i++) {
dateArr[i] = DateUtil.formatDate(cal.getTime());
cal.add(Calendar.DAY_OF_MONTH, 1);
}
return dateArr;
}

public static String[] getFormatOneWeekDateLable(String[] dates) {
String[] dateArr = new String[dates.length];
for (int i = 0; i < 7; i++) {
dateArr[i] = DateUtil.formatMMDD(dates[i]);
}
return dateArr;
}

/**
*
* Return a date string formatted by YYYY-MM-DD.
*
* @param spanType
*            The type you want to span, such as Calendar.MONTH
* @param span
*            The count you want to span
* @return
*/
public static String getDateStr(int spanType, int span) {
Calendar cal = Calendar.getInstance();
cal.add(spanType, span);
return formatDate(new Date(cal.getTimeInMillis()));
}

/**
*
* Judge if the given string is a valid date format
*
* @param s
* @return
*/
public static boolean isValidDate(String s) {
try {
if (s.length() > 19) {
return false;
} else {
yyyyMMddHHmmss.parse(s);
return true;
}
} catch (Exception e) {
// 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
return false;
}
}

/**
*
* Format the given string to date, if the time part is not "00:00:00",
* return the date part.
*
* @param str
* @return
*/
public static String getDate(String str) {
String s;
try {
java.util.Date d = yyyyMMddHHmmss.parse(str);
s = formatDateTime(d);
if (s.indexOf("00:00:00") != -1) {
return s.substring(0, s.indexOf("00:00:00")).trim();
} else {
return s;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static String formatMS(Date date){
if (date == null)
return StringUtil.EMPTY;
return MS.format(date);
}

public static String saveDate(String createDate){
String dateCatalogue=DateUtil.formatDate((DateUtil.formatStrDateTime(createDate.replace("/", "-")))).replace("-", "_");

return dateCatalogue;
}

public static String getFileDateTime(String dateTime){
char[] strArray=dateTime.toCharArray();
StringBuffer sb=new StringBuffer();
for(int i=0;i<strArray.length;i++){
sb.append(strArray[i]);
if(i==3)
sb.append("-");
else if(i==5)
sb.append("-");
else if(i==7){
sb.append(" ");
}
else if(i==9){
sb.append(":");
}else if(i==11)
sb.append(":");

}

return sb.toString();
}

public static Date readDate(String catalogue) {
Date date = formatStrDateTime(catalogue.replace("_", "-")
+ " 10:00:00");
return date;

}

/**
* 将时间转换为文件名称
* @param dateTime
* @return
*/
public static String convertTimeToFileName(String dateTime, String suffix){
return dateTime.replace("-", "").replace(":", "").replace(" ", "") + suffix;
}

public static String formatDate(SimpleDateFormat format, Date date){
if (date == null)
return format.format(new Date());
return format.format(date);
}
}