java日期转化工具类

package com.rest.ful.utils;

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

/**
 * 日期工具类
 * @author zlzhaoe
 * @version [版本号, 2017-5-10下午3:02:08 ]
 * @see [相关类/方法]
 * @since [产品/模块版本]
 */
public class DateUtils
{

    private static final String DATETIME_PATTERN = "yyyy-MM-dd HH:mm:ss";

    private static final String DATETIME_PATTERN_NO_MSE = "yyyy-MM-dd HH:mm";

    private static final String DATETIME_PAT = "yyyy-MM-dd";

    /**
     * 日期转为字符串
     *
     * @param value
     * @return yyyy-MM-dd HH:mm:ss
     */
    public static String doConvertToString(Object value)
    {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(DATETIME_PATTERN);
        String result = null;
        if (value instanceof Date)
        {
            result = simpleDateFormat.format(value);
        }
        return result;
    }
    /**
     * 日期转为字符串
     *
     * @param value
     * @return yyyy-MM-dd
     */
    public static String convertToString(Object value)
    {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(DATETIME_PAT);
        String result = null;
        if (value instanceof Date)
        {
            result = simpleDateFormat.format(value);
        }
        return result;
    }
    /**
     * 比较是否滞后于系统时间
     *
     * @param value
     * @return
     */
    public static boolean afterToSystemDate(Object value)
    {
        boolean result = false;
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(DATETIME_PATTERN_NO_MSE);
        Date date = null;
        try
        {
            date = simpleDateFormat.parse((String)value);
        }
        catch (ParseException e)
        {
            e.printStackTrace();
        }
        result = date.after(new Date());
        return result;
    }

    public static boolean afterToSysDateInterval(String value, int minutes)
    {
        java.util.Date date = null;
        date = new Date(Long.valueOf(value));
        java.util.Date sysDate = new Date();
        long between = (sysDate.getTime() - date.getTime()) / 1000;// 除以1000是为了转换成秒
        return between > minutes;
    }

    /**
     * 获取当前时间的毫秒数
     * 
     * @return
     */
    public static String getCurrentTimeMillis()
    {
        return System.currentTimeMillis() + "";
    }

    /**
     * 获得指定日期的前一天
     * 
     * @param specifiedDay
     * @return
     * @throws Exception
     */
    public static Date getSpecifiedDayBefore(Date date)
    {// 可以用new Date().toLocalString()传递参数
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        int day = c.get(Calendar.DATE);
        c.set(Calendar.DATE, day - 1);
        return c.getTime();
    }


    /**
     * 两个时间之间相差距离多少天
     * 
     * @param one 时间参数 1：
     * @param two 时间参数 2：
     * @return 相差天数
     */
    public static long getDistanceDays(String str1, String str2)
        throws Exception
    {
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        Date one;
        Date two;
        long days = 0;
        try
        {
            one = df.parse(str1);
            two = df.parse(str2);
            long time1 = one.getTime();
            long time2 = two.getTime();
            long diff;
            if (time1 < time2)
            {
                diff = time2 - time1;
            }
            else
            {
                diff = time1 - time2;
            }
            days = diff / (1000 * 60 * 60 * 24);
        }
        catch (ParseException e)
        {
            e.printStackTrace();
        }
        return days;
    }

    /**
     * 两个时间相差距离多少天多少小时多少分多少秒
     * 
     * @param str1 时间参数 1 格式：1990-01-01 12:00:00
     * @param str2 时间参数 2 格式：2009-01-01 12:00:00
     * @return long[] 返回值为：{天, 时, 分, 秒}
     */
    public static long[] getDistanceTimes(String str1, String str2)
    {
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date one;
        Date two;
        long day = 0;
        long hour = 0;
        long min = 0;
        long sec = 0;
        try
        {
            one = df.parse(str1);
            two = df.parse(str2);
            long time1 = one.getTime();
            long time2 = two.getTime();
            long diff;
            if (time1 < time2)
            {
                diff = time2 - time1;
            }
            else
            {
                diff = time1 - time2;
            }
            day = diff / (24 * 60 * 60 * 1000);
            hour = (diff / (60 * 60 * 1000) - day * 24);
            min = ((diff / (60 * 1000)) - day * 24 * 60 - hour * 60);
            sec = (diff / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);
        }
        catch (ParseException e)
        {
            e.printStackTrace();
        }
        long[] times = {day, hour, min, sec};
        return times;
    }

    /**
     * 两个时间相差距离多少天多少小时多少分多少秒
     * 
     * @param str1 时间参数 1 格式：1990-01-01 12:00:00
     * @param str2 时间参数 2 格式：2009-01-01 12:00:00
     * @return String 返回值为：xx天xx小时xx分xx秒
     */
    public static String getDistanceTime(Date str1, Date str2)
    {
        long day = 0;
        long hour = 0;
        long min = 0;
        long sec = 0;
        long time1 = str1.getTime();
        long time2 = str2.getTime();
        long diff;
        if (time1 < time2)
        {
            diff = time2 - time1;
        }
        else
        {
            diff = time1 - time2;
        }
        // day = diff / (24 * 60 * 60 * 1000);
        // hour = (diff / (60 * 60 * 1000) - day * 24);
        // min = ((diff / (60 * 1000)) - day * 24 * 60 - hour * 60);
        sec = (diff / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);
        return sec + "";
    }

}

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