date工具类

package com.panchan.tsmese.utils;

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

import com.panchan.tsmese.entity.ErrorCodeEnum;
import com.panchan.tsmese.exception.TsmEseException;

/**
 * @Description: 时间工具类
 * @version 1.0
 * @since JDK1.8
 * @author 
 * @Created on 2018年8月29日
 */

public class DateUtils {

    public static final String DATE_FORMAT_DATE = "yyyy-MM-dd";
    public static final String DATE_FORMAT_DATETIME = "yyyy-MM-dd HH:mm:ss";
    public static final String DATE_FORMAT_TIME = "HH:mm:ss";
    public static final String DATE_FORMAT_DATEMILTIME = "yyyy-MM-dd HH:mm:ss.SSS";
    public static final String DATE_FORMAT_DATEMALTIME = "yyyyMMddHHmmss";
    public static final String DATE_FORMAT_DATEALLTIME = "yyyyMMddHHmmssSSS";
    
    /**
     * 当前时间转long毫秒
     * @param dateFormat 转字符串格式
     * @return
     */
    public static String getCurrentDateStr(String dateFormat) {
        Calendar c = Calendar.getInstance();
        DateFormat df = new SimpleDateFormat(dateFormat);
        return df.format(c.getTime());
    }

    /**
     * 时间字符串转时间格式
     * @param dateStr 时间字符串
     * @param dateFormat 转字符串格式
     * @return
     */
    public static Date getDateFromStr(String dateStr, String dateFormat) {
        try {
            DateFormat df = new SimpleDateFormat(dateFormat);
            return df.parse(dateStr);
        } catch (ParseException e) {
            throw new TsmEseException(ErrorCodeEnum.SYSTEM_ERROR.getErrorCode(), e);
        }
    }
    
    /**
     * 
     * @param date 时间
     * @param dateFormat 转字符串格式
     * @return
     */
    public static String getFormatedDateStr(Date date, String dateFormat){
        DateFormat df = new SimpleDateFormat(dateFormat);
        return df.format(date);
    }

    /**
     * 当前时间转字符串
     * @param format 
     * @return
     */
    public static String getNowTime(String format) {
        SimpleDateFormat df = new SimpleDateFormat(format);
        return df.format(new Date());
    }
    
    /**
     * getCurrentDate 获取时间，具体到日
     * @return CurrentDate
     */
    public static String getCurrentDate(){
        Date result = new Date();
        
        Long timeLong = System.currentTimeMillis();
        DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
        result.setTime(timeLong);
        
        return dateFormat.format(result);
    }
    
    /**
     * getCurrentDateTime 获取时间到秒
     * @return CurrentDateTime
     */
    public static String getCurrentDateTime(){
        Date result = new Date();
        
        Long timeLong = System.currentTimeMillis();
        DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
        result.setTime(timeLong);
        
        return format.format(result);
    }
    
    /**
     * @return 
     * @Description:判断两个时间是否超过24小时
     * @param  
     * @return void
     * @throws
     */
    public static boolean calculatTtime(String createTime, String updateTime) throws Exception {            
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date start = sdf.parse(createTime);
        Date end = sdf.parse(updateTime);

        long cha = end.getTime() - start.getTime();
        double result = cha * 1.0 / (1000 * 60 * 60);
        if(result <= 24){
            return false;    //说明小于24小时
        }else{
            return true;
        }
    }

}