DateUtils_JAVA_编程开发_程序员俱乐部

class="DateUtils" name="code">package com.common.utils;

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

import org.apache.commons.lang.StringUtils;

/**
 * The Class DateUtils.
 */
public final class DateUtils {

	/**
	 * Instantiates a new date utils.
	 */
	private DateUtils() {
	}

	/**
	 * Parses the str to date.
	 * 
	 * @param dateStr
	 *            the date str
	 * @param pattern
	 *            the pattern
	 * @return the date
	 * @throws ParseException
	 *             the parse exception
	 */
	public static Date parseStrToDate(String dateStr, String pattern) throws ParseException {
		Date result = null;
		if (StringUtils.isNotEmpty(dateStr)) {
			return new SimpleDateFormat(pattern).parse(dateStr);
		}
		return result;
	}

	/**
	 * Parses the date to str.
	 * 
	 * @param date
	 *            the date
	 * @param pattern
	 *            the pattern
	 * @return the string
	 */
	public static String parseDateToStr(Date date, String pattern) {
		String result = null;
		if (date != null) {
			return new SimpleDateFormat(pattern).format(date);
		}
		return result;
	}

	/**
	 * Parses the date pattern.
	 * 
	 * @param sourceDate
	 *            the source date
	 * @param fromPattern
	 *            the pattern of sourceDate
	 * @param toPattern
	 *            the pattern of return
	 * @return the string
	 * @throws ParseException
	 *             the parse exception
	 */
	public static String parsePattern(String sourceDate, String fromPattern, String toPattern) throws ParseException {
		String result = null;
		if (StringUtils.isNotEmpty(sourceDate)) {
			Date tempDate = parseStrToDate(sourceDate, fromPattern);
			result = parseDateToStr(tempDate, toPattern);
		}
		return result;
	}
}

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