timehelper.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

package com.esimple.framework.util;

import java.text.SimpleDateFormat;
import java.util.HashMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 日期处理工具类 <br>
 * 
 * @author Steven Li
 * @version 1.0 
 */
public class TimeHelper {
	
	public static final String DEFAULT_DATE_PATTERN = "yyyyMMdd";
	private Log logger = LogFactory.getLog(this.getClass());
	private static HashMap parsers = new HashMap();
	
	
	private static SimpleDateFormat getDateParser(String pattern){
		Object parser = parsers.get(pattern);
		if( parser == null){
			parser = new SimpleDateFormat(pattern);
			parsers.put( pattern,parser);
		}
		return (SimpleDateFormat)parser;
	}
	
	/** 
	 * Return a Timestamp for right now
	 * @return Timestamp for right now
	 */
	public static java.sql.Timestamp nowTimestamp() {
		return new java.sql.Timestamp(System.currentTimeMillis());
	}
	
	/**
	 * 将格式为yyyyMMdd日期字符串转换为java.sql.Date对象
	 * @param dateString
	 * @return java.sql.Date
	 * @throws ConvertException
	 */
	public static java.sql.Date getSqlDate(String dateString)
	throws ConvertException {	
		return new java.sql.Date(
			getDate(dateString,DEFAULT_DATE_PATTERN).getTime()
		);
	}
	
	/**
	 * 将日期字符串转换为java.sql.Date对象
	 * @param dateString
	 * @param pattern 日期字符串的格式
	 * @return
	 * @throws ConvertException
	 * @see java.text.SimpleDateFormat
	 */
	public static java.sql.Date getSqlDate(
		String dateString,
		String pattern)	throws ConvertException {	
		return new java.sql.Date(
			getDate(dateString,pattern).getTime()
		);
	}
	
	/**
	 * 将格式为yyyyMMdd日期字符串转换为java.util.Date对象
	 * @param dateString
	 * @return java.util.Date
	 * @throws ConvertException
	 * @see java.text.SimpleDateFormat
	 */
	public static java.util.Date getDate(String dateString)	throws ConvertException {	
		return getDate(dateString,DEFAULT_DATE_PATTERN);
	}
	
	/**
	 * 将日期字符串转换为java.util.Date对象
	 * @param dateString
	 * @param pattern 日期字符串的格式
	 * @return java.util.Date
	 * @throws ConvertException
	 * @see java.text.SimpleDateFormat
	 */
	public static java.util.Date getDate(
		String dateString,
		String pattern)	throws ConvertException {	
		try{
			return  getDateParser(pattern).parse(dateString);
		}catch(Exception e){
			throw new ConvertException("error in convert String ["
				+ dateString + "] to java.sql.Date with pattern "
				+ pattern
			);
		}
	}

	/** Return a Date for right now
	 * @return Date for right now
	 */
	public static java.util.Date nowDate() {
		return new java.util.Date();
	}
	
	/**
	 * 获取当前日期，返回字符串，格式为yyyyMMdd
	 * @return
	 */
	public static String nowDateString(){
		return nowDate(DEFAULT_DATE_PATTERN);
	}	
	
	/**
	 * 按照指定格式返回当前日期字符串
	 * @param strFormat
	 * @return
	 */	
	public static String nowDate(String strFormat){
		java.util.Date date = new java.util.Date();
		return  getDateParser(strFormat).format(date);
	}

	/**
	 * 按照yyyyMMdd返回日期字符串
	 * @param strFormat
	 * @return
	 */	
	public static String toString(java.util.Date date){
		return  getDateParser(DEFAULT_DATE_PATTERN).format(date);
	}

	/**
	 * 按照指定格式返回日期字符串
	 * @param strFormat
	 * @return
	 */	
	public static String toString(java.util.Date date,String strFormat){
		return  getDateParser(strFormat).format(date);
	}
}