Java日期處理工具類
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- regarding copyright ownership. The ASF licenses this file
- to you under the Apache License, Version 2.0 (the
- "License"); you may not use this file except in compliance
- with the License. You may obtain a copy of the License at *
- http://www.apache.org/licenses/LICENSE-2.0 *
- Unless required by applicable law or agreed to in writing,
- software distributed under the License is distributed on an
- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- KIND, either express or implied. See the License for the
- specific language governing permissions and limitations
- under the License. */
package org.apache.ftpserver.util;
import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; import java.util.TimeZone;
/**
- <strong>Internal class, do not use directly.</strong>
- Standard date related utility methods. *
@author <a href=" MINA Project</a> */ public class DateUtils {
private static final TimeZone TIME_ZONE_UTC = TimeZone.getTimeZone("UTC");
private final static String[] MONTHS = { "Jan", "Feb", "Mar", "Apr", "May",
"Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };/*
- Creates the DateFormat object used to parse/format
dates in FTP format. */ private static final ThreadLocal<DateFormat> FTP_DATE_FORMAT = new ThreadLocal<DateFormat>() {
@Override protected DateFormat initialValue() {
DateFormat df=new SimpleDateFormat("yyyyMMddHHmmss"); df.setLenient(false); df.setTimeZone(TimeZone.getTimeZone("GMT")); return df;}
};
/**
Get unix style date string. */ public final static String getUnixDate(long millis) { if (millis < 0) {
return "------------";}
StringBuffer sb = new StringBuffer(16); Calendar cal = new GregorianCalendar(); cal.setTimeInMillis(millis);
// month sb.append(MONTHS[cal.get(Calendar.MONTH)]); sb.append(' ');
// day int day = cal.get(Calendar.DATE); if (day < 10) {
sb.append(' ');} sb.append(day); sb.append(' ');
long sixMonth = 15811200000L; // 183L 24L 60L 60L 1000L; long nowTime = System.currentTimeMillis(); if (Math.abs(nowTime - millis) > sixMonth) {
// year int year = cal.get(Calendar.YEAR); sb.append(' '); sb.append(year);} else {
// hour int hh = cal.get(Calendar.HOUR_OF_DAY); if (hh < 10) { sb.append('0'); } sb.append(hh); sb.append(':'); // minute int mm = cal.get(Calendar.MINUTE); if (mm < 10) { sb.append('0'); } sb.append(mm);} return sb.toString(); }
/**
Get ISO 8601 timestamp. */ public final static String getISO8601Date(long millis) { StringBuffer sb = new StringBuffer(19); Calendar cal = new GregorianCalendar(); cal.setTimeInMillis(millis);
// year sb.append(cal.get(Calendar.YEAR));
// month sb.append('-'); int month = cal.get(Calendar.MONTH) + 1; if (month < 10) {
sb.append('0');} sb.append(month);
// date sb.append('-'); int date = cal.get(Calendar.DATE); if (date < 10) {
sb.append('0');} sb.append(date);
// hour sb.append('T'); int hour = cal.get(Calendar.HOUR_OF_DAY); if (hour < 10) {
sb.append('0');} sb.append(hour);
// minute sb.append(':'); int min = cal.get(Calendar.MINUTE); if (min < 10) {
sb.append('0');} sb.append(min);
// second sb.append(':'); int sec = cal.get(Calendar.SECOND); if (sec < 10) {
sb.append('0');} sb.append(sec);
return sb.toString(); }
/**
Get FTP date. */ public final static String getFtpDate(long millis) { StringBuffer sb = new StringBuffer(20);
// MLST should use UTC Calendar cal = new GregorianCalendar(TIME_ZONE_UTC); cal.setTimeInMillis(millis);
// year
sb.append(cal.get(Calendar.YEAR));
// month
int month = cal.get(Calendar.MONTH) + 1;
if (month < 10) {
sb.append('0');
}
sb.append(month);
// date
int date = cal.get(Calendar.DATE);
if (date < 10) {
sb.append('0');
}
sb.append(date);
// hour
int hour = cal.get(Calendar.HOUR_OF_DAY);
if (hour < 10) {
sb.append('0');
}
sb.append(hour);
// minute
int min = cal.get(Calendar.MINUTE);
if (min < 10) {
sb.append('0');
}
sb.append(min);
// second
int sec = cal.get(Calendar.SECOND);
if (sec < 10) {
sb.append('0');
}
sb.append(sec);
// millisecond
sb.append('.');
int milli = cal.get(Calendar.MILLISECOND);
if (milli < 100) {
sb.append('0');
}
if (milli < 10) {
sb.append('0');
}
sb.append(milli);
return sb.toString();
}
/*
* Parses a date in the format used by the FTP commands
* involving dates(MFMT, MDTM)
*/
public final static Date parseFTPDate(String dateStr) throws ParseException{
return FTP_DATE_FORMAT.get().parse(dateStr);
}
}</pre>