dateutil.java

java 的通用日期处理函数

/*
 * <p>Company: </p>
 * @author liubaojun
 * @version 1.0
 * Created on 2004-11-29
 */

import java.text.*;
import java.util.*;

public class DateUtil
{
 private static final int[] dayArray = new int[]
  { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
 private static SimpleDateFormat sdf = new SimpleDateFormat();

 public static synchronized Calendar getCalendar()
 {
  return GregorianCalendar.getInstance();
 }

 /**
  @return String
  */
 public static synchronized String getDateMilliFormat()
 {
  Calendar cal = Calendar.getInstance();
  return getDateMilliFormat( cal );
 }

 /**
  @param cal
  @return String
  */
 public static synchronized String getDateMilliFormat( java.util.Calendar cal )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss,SSS";
  return getDateFormat( cal, pattern );
 }

 /**
  @param date
  @return String
  */
 public static synchronized String getDateMilliFormat( java.util.Date date )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss,SSS";
  return getDateFormat( date, pattern );
 }

 /**
  @param strDate
  @return java.util.Calendar
  */
 public static synchronized Calendar parseCalendarMilliFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss,SSS";
  return parseCalendarFormat( strDate, pattern );
 }

 /**
  @param strDate
  @return java.util.Date
  */
 public static synchronized Date parseDateMilliFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss,SSS";
  return parseDateFormat( strDate, pattern );
 }

 /**
  @return String
  */
 public static synchronized String getDateSecondFormat()
 {
  Calendar cal = Calendar.getInstance();
  return getDateSecondFormat( cal );
 }

 /**
  @param cal
  @return String
  */
 public static synchronized String getDateSecondFormat( java.util.Calendar cal )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return getDateFormat( cal, pattern );
 }

 /**
  @param date
  @return String
  */
 public static synchronized String getDateSecondFormat( java.util.Date date )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return getDateFormat( date, pattern );
 }

 /**
  @param strDate
  @return java.util.Calendar
  */
 public static synchronized Calendar parseCalendarSecondFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return parseCalendarFormat( strDate, pattern );
 }

 /**
  @param strDate
  @return java.util.Date
  */
 public static synchronized Date parseDateSecondFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return parseDateFormat( strDate, pattern );
 }

 /**
  @return String
  */
 public static synchronized String getDateMinuteFormat()
 {
  Calendar cal = Calendar.getInstance();
  return getDateMinuteFormat( cal );
 }

 /**
  @param cal
  @return String
  */
 public static synchronized String getDateMinuteFormat( java.util.Calendar cal )
 {
  String pattern = "yyyy-MM-dd HH:mm";
  return getDateFormat( cal, pattern );
 }

 /**
  @param date
  @return String
  */
 public static synchronized String getDateMinuteFormat( java.util.Date date )
 {
  String pattern = "yyyy-MM-dd HH:mm";
  return getDateFormat( date, pattern );
 }

 /**
  @param strDate
  @return java.util.Calendar
  */
 public static synchronized Calendar parseCalendarMinuteFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd HH:mm";
  return parseCalendarFormat( strDate, pattern );
 }

 /**
  @param strDate
  @return java.util.Date
  */
 public static synchronized Date parseDateMinuteFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd HH:mm";
  return parseDateFormat( strDate, pattern );
 }

 /**
  @return String
  */
 public static synchronized String getDateDayFormat()
 {
  Calendar cal = Calendar.getInstance();
  return getDateDayFormat( cal );
 }

 /**
  @param cal
  @return String
  */
 public static synchronized String getDateDayFormat( java.util.Calendar cal )
 {
  String pattern = "yyyy-MM-dd";
  return getDateFormat( cal, pattern );
 }

 /**
  @param date
  @return String
  */
 public static synchronized String getDateDayFormat( java.util.Date date )
 {
  String pattern = "yyyy-MM-dd";
  return getDateFormat( date, pattern );
 }

 /**
  @param strDate
  @return java.util.Calendar
  */
 public static synchronized Calendar parseCalendarDayFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd";
  return parseCalendarFormat( strDate, pattern );
 }

 /**
  @param strDate
  @return java.util.Date
  */
 public static synchronized Date parseDateDayFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd";
  return parseDateFormat( strDate, pattern );
 }

 /**
  @return String
  */
 public static synchronized String getDateFileFormat()
 {
  Calendar cal = Calendar.getInstance();
  return getDateFileFormat( cal );
 }

 /**
  @param cal
  @return String
  */
 public static synchronized String getDateFileFormat( java.util.Calendar cal )
 {
  String pattern = "yyyy-MM-dd_HH-mm-ss";
  return getDateFormat( cal, pattern );
 }

 /**
  @param date
  @return String
  */
 public static synchronized String getDateFileFormat( java.util.Date date )
 {
  String pattern = "yyyy-MM-dd_HH-mm-ss";
  return getDateFormat( date, pattern );
 }

 /**
  @param strDate
  @return java.util.Calendar
  */
 public static synchronized Calendar parseCalendarFileFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd_HH-mm-ss";
  return parseCalendarFormat( strDate, pattern );
 }

 /**
  @param strDate
  @return java.util.Date
  */
 public static synchronized Date parseDateFileFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd_HH-mm-ss";
  return parseDateFormat( strDate, pattern );
 }

 /**
  @return String
  */
 public static synchronized String getDateW3CFormat()
 {
  Calendar cal = Calendar.getInstance();
  return getDateW3CFormat( cal );
 }

 /**
  @param cal
  @return String
  */
 public static synchronized String getDateW3CFormat( java.util.Calendar cal )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return getDateFormat( cal, pattern );
 }

 /**
  @param date
  @return String
  */
 public static synchronized String getDateW3CFormat( java.util.Date date )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return getDateFormat( date, pattern );
 }

 /**
  @param strDate
  @return java.util.Calendar
  */
 public static synchronized Calendar parseCalendarW3CFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return parseCalendarFormat( strDate, pattern );
 }

 /**
  @param strDate
  @return java.util.Date
  */
 public static synchronized Date parseDateW3CFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return parseDateFormat( strDate, pattern );
 }

 /**
  @param cal
  @return String
  */
 public static synchronized String getDateFormat( java.util.Calendar cal )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return getDateFormat( cal, pattern );
 }

 /**
  @param date
  @return String
  */
 public static synchronized String getDateFormat( java.util.Date date )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return getDateFormat( date, pattern );
 }

 /**
  @param strDate
  @return java.util.Calendar
  */
 public static synchronized Calendar parseCalendarFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return parseCalendarFormat( strDate, pattern );
 }

 /**
  @param strDate
  @return java.util.Date
  */
 public static synchronized Date parseDateFormat( String strDate )
 {
  String pattern = "yyyy-MM-dd HH:mm:ss";
  return parseDateFormat( strDate, pattern );
 }

 /**
  @param cal
  @param pattern
  @return String
  */
 public static synchronized String getDateFormat( java.util.Calendar cal, String pattern )
 {
  return getDateFormat( cal.getTime(), pattern );
 }

 /**
  @param date
  @param pattern
  @return String
  */
 public static synchronized String getDateFormat( java.util.Date date, String pattern )
 {
  synchronized ( sdf )
  {
   String str = null;
   sdf.applyPattern( pattern );
   str = sdf.format( date );
   return str;
  }
 }

 /**
  @param strDate
  @param pattern
  @return java.util.Calendar
  */
 public static synchronized Calendar parseCalendarFormat( String strDate, String pattern )
 {
  synchronized ( sdf )
  {
   Calendar cal = null;
   sdf.applyPattern( pattern );
   try
   {
    sdf.parse( strDate );
    cal = sdf.getCalendar();
   }
   catch ( Exception e )
   {
   }
   return cal;
  }
 }

 /**
  @param strDate
  @param pattern
  @return java.util.Date
  */
 public static synchronized Date parseDateFormat( String strDate, String pattern )
 {
  synchronized ( sdf )
  {
   Date date = null;
   sdf.applyPattern( pattern );
   try
   {
    date = sdf.parse( strDate );
   }
   catch ( Exception e )
   {
   }
   return date;
  }
 }

 public static synchronized int getLastDayOfMonth( int month )
 {
  if ( month < 1 || month > 12 )
  {
   return -1;
  }
  int retn = 0;
  if ( month == 2 )
  {
   if ( isLeapYear() )
   {
    retn = 29;
   }
   else
   {
    retn = dayArray[month - 1];
   }