dateex.java

以前做的一个j2ee的项目

package gov.gdlt.ssgly.taxcore.taxblh.gzda.service.xmlinterface.impl;

import java.sql.Timestamp;
import java.text.*;
import java.util.Date;
import java.util.Calendar;
import java.util.GregorianCalendar;
public class DateEx {
    public static final long HOUR = 0x36ee80L;
    public static final long DAY = 0x5265c00L;
    public static final int MONTH=GregorianCalendar.MONTH;
    public static final int DAY_OF_MONTH=GregorianCalendar.DAY_OF_MONTH;
    public static final int YEAR=GregorianCalendar.YEAR;
    public static final String dateFormat = "yyyy.MM.dd HH:mm:ss";

    public DateEx() {
    }
    public static Date parseDate(String yyyymmddhhmmss, String format)
    {
        SimpleDateFormat formatter = new SimpleDateFormat(format);
        try
        {
            ParsePosition pos = new ParsePosition(0);
            Date date = formatter.parse(yyyymmddhhmmss, pos);
            return date;
        }
        catch(Exception e)
        {
            throw new IllegalArgumentException(String.valueOf(String.valueOf((new StringBuffer("错误的日期:")).append(yyyymmddhhmmss).append(" ").append(e))));
        }
    }

    public Timestamp parseTimestamp(String yyyymmddhhmmss)
    {
        return new Timestamp(parseDate(yyyymmddhhmmss).getTime());
    }

    public Date parseDate(String yyyymmddhhmmss)
    {
        if(yyyymmddhhmmss == null || yyyymmddhhmmss.length() == 0)
            return null;
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss");
        try
        {
            yyyymmddhhmmss = yyyymmddhhmmss.replace('-', '.');
            if(yyyymmddhhmmss.indexOf(":") < 0)
                yyyymmddhhmmss = String.valueOf(String.valueOf(yyyymmddhhmmss)).concat(" 00:00:00");
            ParsePosition pos = new ParsePosition(0);
            Date date = formatter.parse(yyyymmddhhmmss, pos);
            return date;
        }
        catch(Exception e)
        {
            throw new IllegalArgumentException(String.valueOf(String.valueOf((new StringBuffer("错误的日期:")).append(yyyymmddhhmmss).append(" ").append(e))));
        }
    }

    public static String dateToString(Date date)
    {
        if(date == null)
            return null;
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss");
        try
        {
            String s = formatter.format(date);
            return s;
        }
        catch(Exception e)
        {
            e.printStackTrace();
            throw new IllegalArgumentException("日期转换成字符串失败:".concat(String.valueOf(String.valueOf(e))));
        }
    }

    public static String dateToString(Timestamp date, String format)
    {
        return dateToString(((Date) (date)), format);
    }

    public static String dateToString(Date date, String format)
    {
        if(date == null)
            return null;
        SimpleDateFormat formatter = new SimpleDateFormat(format);
        try
        {
            String s = formatter.format(date);
            return s;
        }
        catch(Exception e)
        {
            e.printStackTrace();
            throw new IllegalArgumentException("日期转换成字符串失败:".concat(String.valueOf(String.valueOf(e))));
        }
    }

    public static String getORACLEdatestring(Date d)
    {
        return String.valueOf(String.valueOf((new StringBuffer("to_date('")).append(dateToString(d)).append("','yyyy.mm.dd hh24:mi:ss')")));
    }

    public static Timestamp nowTime()
    {
        return new Timestamp(System.currentTimeMillis());
    }

    public static java.sql.Date getFirstDateOfMonth(Date date){
      String sdate=DateEx.dateToString(date,"yyyyMMdd");
      return java.sql.Date.valueOf(sdate.substring(0,4)
                                   +"-"+sdate.substring(4,6)+"-01");
    }


    public static int dateDiffWith(Date date1,Date date2,String mode){
      //date2应大于date1

      return (int) ((date2.getTime() - date1.getTime())/(24*60*60*1000));

    }
    public static java.sql.Date dateAfter(Date date,int days,int mode){
        GregorianCalendar grc=new GregorianCalendar();
        grc.setTime(date);
        grc.add(mode,days);
        Date date2=grc.getTime();
        return java.sql.Date.valueOf(dateToString(date2,"yyyy-MM-dd"));
    }
    public static int getDaysOfMonth(Date date){
      Date d1=getFirstDateOfMonth(date);
      Date d2=getFirstDateOfMonth(dateAfter(date,1,MONTH));
      return dateDiffWith(d1,d2,"dd");
    }
    public static int getYear(Date date){
      String sdateD=DateEx.dateToString(date,"yyyyMMdd");
      return Integer.parseInt(sdateD.substring(0,4));
    }

    public static int getMonth(Date date){
      String sdateD=DateEx.dateToString(date,"yyyyMMdd");
      return Integer.parseInt(sdateD.substring(4,6));
    }
    public static int getDay(Date date){
      String sdateD=DateEx.dateToString(date,"yyyyMMdd");
      return Integer.parseInt(sdateD.substring(6,8));
    }

    public static java.sql.Date today()
    {
      long dateTemp = (new java.util.Date()).getTime();
      return new java.sql.Date(dateTemp);
    }

}