dateutil.java

SSH示范

package com.iplan.portal.framework.utils;

import org.springframework.context.i18n.LocaleContextHolder;
import com.iplan.portal.framework.Constants;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * Date Utility 类
 * <p>
 * http://www.hao-se.cn
 * </p>
 * 
 * @author ws
 */
public class DateUtil
{
	private static String defaultDatePattern = "yyyy-MM-dd";
    public static String DATE_PATTERN = "yyyy/MM/dd";
    
    static
    {

        Locale locale = LocaleContextHolder.getLocale();
        //尝试试从messages_zh_Cn.properties中获取defaultDatePattner.
        try
        {
            defaultDatePattern = ResourceBundle.getBundle(Constants.MESSAGE_BUNDLE_KEY, locale).getString("date.default_format");
        }
        catch (MissingResourceException mse)
        {
            ;
        }
    }

    /**
     * get the default date pattern
     */
    public static String getDatePattern()
    {
        return defaultDatePattern;
    }

    /**
     * returns the current date in the default format
     */
    public static String getToday()
    {
        Date today = new Date();
        return format(today);
    }

    /**
     * convert Date to String  in default format
     */
    public static String format(Date date)
    {
        return format(date, getDatePattern());
    }

    /**
     * convert Date to String in pattern
     */
    public static String format(Date date, String pattern)
    {
        String returnValue = "";

        if (date != null)
        {
            SimpleDateFormat df = new SimpleDateFormat(pattern);
            returnValue = df.format(date);
        }

        return (returnValue);
    }

    /**
     * converts a String to a Date using the default Pattern
     */
    public static Date parse(String strDate) throws ParseException
    {
        return parse(strDate, getDatePattern());
    }

    /**
     * converts a String to a Date using the  pattern
     */
    public static Date parse(String strDate, String pattern) throws ParseException
    {
        SimpleDateFormat df = new SimpleDateFormat(pattern);
        return df.parse(strDate);
    }

    /**
     * add some month from the date
     */
    public static Date addMonth(Date date, int n) throws Exception
    {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.add(Calendar.MONTH, n);
        return cal.getTime();
    }
    
	/**
	 * This method attempts to convert an DB2-formatted date in the form
	 * yyyy-MM-dd to dd/MM/yyyy.
	 * 
	 * @param aDate
	 *            date from database as a string
	 * @return formatted string for the ui
	 */
	public static final String convertDateToString(Date aDate) {
		return convertDateToString(DATE_PATTERN, aDate);
	}
	
	/**
	 * 
	 * @param aMask
	 * @param aDate
	 * @return
	 */
	public static final String convertDateToString(String aMask, Date aDate) {
		String returnValue = "";
		if (aDate != null) {
			SimpleDateFormat df = new SimpleDateFormat(aMask);
			returnValue = df.format(aDate);
		}

		return (returnValue);
	}
	
	public static final Date convertStringToDate(String strDate) {
		return convertStringToDate(DATE_PATTERN, strDate);
	}
	
	/**
	 * 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
	 */
	public static final Date convertStringToDate(String aMask, String strDate) {
		SimpleDateFormat df = null;
		Date date = null;
		df = new SimpleDateFormat(aMask);

		try {
			date = df.parse(strDate);
		} catch (ParseException pe) {
			date = null;
		}
		return (date);
	}
	
	public static void  main(String args[]){
		String s = "订单跟踪系统.xls";
		int index = s.lastIndexOf(".");
		s = s.substring(index+1, s.length());
		System.out.println(s);
	}
}