Date与String互相转换的工具类

记录一下，方便以后查询调用

package com.savinghappy.util;

import org.apache.commons.lang.StringUtils;
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

import java.util.Date;


/**
 * Created by Saving on 2017/6/12.
 * 用于String和Datetime之间的相互转换
 */
public class DateTimeUtil
{
private static  final  String DATA_FORMATSTRING="yyyy-MM-dd HH:mm:ss";
private DateTimeUtil()
    {

    }

/**
 * 根据传进来的dataTimeStr和转换的格式formatStr来返回转回后的date
 * @param dataTimeStr
 * @param formatStr
 * @return
 */
public static Date stringToDate(String dataTimeStr , String formatStr)
    {
        DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern(formatStr);
        DateTime dateTime = dateTimeFormatter.parseDateTime(dataTimeStr);
return dateTime.toDate();
    }

/**
 * 根据传进来的data和转换的格式formatStr来返回转回后的date
 * @param date
 * @param formatStr
 * @return
 */
public static String dateToString(Date date ,String formatStr)
    {
if (date==null)return StringUtils.EMPTY;
return new DateTime(date).toString(formatStr);
    }

/**
 *根据传进来的dataTimeStr和转换的格式DATA_FORMATSTRING来返回转回后的date
 * @param dataTimeStr
 * @return
 */
public static Date stringToDate(String dataTimeStr)
    {
        DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern(DATA_FORMATSTRING);
        DateTime dateTime = dateTimeFormatter.parseDateTime(dataTimeStr);
return dateTime.toDate();
    }

/**
 * 根据传进来的data和转换的格式DATA_FORMATSTRING来返回转回后的date
 * @param date
 * @return
 */
public static String dateToString(Date date)
    {
if (date==null)return StringUtils.EMPTY;
return new DateTime(date).toString(DATA_FORMATSTRING);
    }
}