package edu.sjtu.infosec.ismp.manager.EM.util;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.i18n.LocaleContextHolder;
import edu.sjtu.infosec.ismp.manager.EM.comm.Constants;
/**
* DateUtil.
*
* @version 1.0 11 May 2009
* @author zhou chenye
*/
public class DateUtil {
//~ Static fields/initializers =============================================
/**
* 日志
*/
private static Log log = LogFactory.getLog(DateUtil.class);
/**
* 默认日期格式
*/
private static String defaultDatePattern = null;
/**
* 时间格式
*/
private static String timePattern = "yyyy-MM-dd HH:mm:ss";
//~ Methods ================================================================
/**
* Return default datePattern (MM/dd/yyyy)
* @return a string representing the date pattern on the UI
*/
public static synchronized String getDatePattern() {
Locale locale = LocaleContextHolder.getLocale();
try {
defaultDatePattern = ResourceBundle.getBundle(Constants.BUNDLE_KEY,
locale).getString("date.format");
} catch (MissingResourceException mse) {
defaultDatePattern = "yyyy-MM-dd HH:mm:ss";
}
return defaultDatePattern;
}
/**
* This method attempts to convert an Oracle-formatted date
* in the form dd-MMM-yyyy to mm/dd/yyyy.
*
* @param aDate date from database as a string
* @return formatted string for the ui
*/
public static final String getDate(Date aDate) {
SimpleDateFormat df = null;
String returnValue = "";
if (aDate != null) {
df = new SimpleDateFormat(getDatePattern());
returnValue = df.format(aDate);
}
return (returnValue);
}
/**
* This method generates a string representation of a date/time
* in the format you specify on input
*
* @param aMask the date pattern the string is in
* @param strDate a string representation of a date
* @return a converted Date object
* @see java.text.SimpleDateFormat
* @throws ParseException ParseException
*/
public static final Date convertStringToDate(String aMask, String strDate)
throws ParseException {
SimpleDateFormat df = null;
Date date = null;
df = new SimpleDateFormat(aMask);
if (log.isDebugEnabled()) {
log.debug("converting '" + strDate + "' to date with mask '"
+ aMask + "'");
}
try {
date = df.parse(strDate);
} catch (ParseException pe) {
//log.error("ParseException: " + pe);
throw new ParseException(pe.getMessage(), pe.getErrorOffset());
}
return (date);
}
/**
* This method returns the current date time in the format:
* MM/dd/yyyy HH:MM a
*
* @param theTime the current time
* @return the current date/time
* @throws ParseException
*/
public static String getTimeNow() throws ParseException {
Date today = new Date();
SimpleDateFormat df = new SimpleDateFormat(getDatePattern());
// This seems like quite a hack (date -> string -> date),
// but it works ;-)
String todayAsString = df.format(today);
return todayAsString;
}
/**
* This method returns the current date time in the format:
* MM/dd/yyyy HH:MM a
*
* @param theTime the current time
* @return the current date/time
*/
public static String getTimeNow(Date theTime) {
return getDateTime(timePattern, theTime);
}
/**
* This method returns the current date in the format: MM/dd/yyyy
*
* @return the current date
* @throws ParseException ParseException
*/
public static Calendar getToday() throws ParseException {
Date today = new Date();
SimpleDateFormat df = new SimpleDateFormat(getDatePattern());
// This seems like quite a hack (date -> string -> date),
// but it works ;-)
String todayAsString = df.format(today);
Calendar cal = new GregorianCalendar();
cal.setTime(convertStringToDate(todayAsString));
return cal;
}
/**
* This method generates a string representation of a date's date/time
* in the format you specify on input
*
* @param aMask the date pattern the string is in
* @param aDate a date object
* @return a formatted string representation of the date
*
* @see java.text.SimpleDateFormat
*/
public static final String getDateTime(String aMask, Date aDate) {
SimpleDateFormat df = null;
String returnValue = "";
if (aDate == null) {
log.error("aDate is null!");
} else {
df = new SimpleDateFormat(aMask);
returnValue = df.format(aDate);
}
return (returnValue);
}
/**
* This method generates a string representation of a date based
* on the System Property 'dateFormat'
* in the format you specify on input
*
* @param aDate A date to convert
* @return a string representation of the date
*/
public static final String convertDateToString(Date aDate) {
return getDateTime(getDatePattern(), aDate);
}
/**
* This method converts a String to a date using the datePattern
*
* @param strDate the date to convert (in format MM/dd/yyyy)
* @return a date object
*
* @throws ParseException ParseException
*/
public static Date convertStringToDate(String strDate)
throws ParseException {
Date aDate = null;
try {
if (log.isDebugEnabled()) {
log.debug("converting date with pattern: " + getDatePattern());
}
aDate = convertStringToDate(getDatePattern(), strDate);
} catch (ParseException pe) {
log.error("Could not convert '" + strDate
+ "' to a date, throwing exception");
pe.printStackTrace();
throw new ParseException(pe.getMessage(), pe.getErrorOffset());
}
return aDate;
}
public static void main(String[] args) throws ParseException{
System.out.println(getDatePattern());
System.out.println(getToday().getTime());
System.out.println(getTimeNow());
System.out.println(Timestamp.valueOf(getTimeNow()));
}
}