时间格式转化 String2datestyle

时间格式转化成string工具类：

package cn.javass.util;

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

public class DateFormatUtil {
    private DateFormatUtil(){}

    public enum DateFormatStyleEnum{
        YMD("yyyy-MM-dd"),YMDHMS("yyyy-MM-dd HH:mm:ss");
        private String str = "";
        private DateFormatStyleEnum(String str){
            this.str  = str;
        }
        public String getStr(){
            return this.str;
        }

    }
    public static String data2Str(DateFormatStyleEnum dfStyle,long time){
        DateFormat df = new SimpleDateFormat(dfStyle.getStr());
        return df.format(new Date(time));
    }
}