Java时间工具类（把日期时间转换成xx秒前、xx分钟前、xx小时前...）

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class DateUtils {
    private static final long ONE_MINUTE = 60;
    private static final long ONE_HOUR = 3600;
    private static final long ONE_DAY = 86400;
    private static final long ONE_MONTH = 2592000;
    private static final long ONE_YEAR = 31104000;

public static Calendar calendar = Calendar.getInstance();

/**
 * 
 * @return yyyy-mm-dd
 *  2012-12-25
 */
public static String getDate() {
    return getYear() + "-" + getMonth() + "-" + getDay();
}

/**
 * @param format
 * @return 
 * yyyy年MM月dd HH:mm 
 * MM-dd HH:mm 2012-12-25
 * 
 */
public static String getDate(String format) {
    SimpleDateFormat simple = new SimpleDateFormat(format);
    return simple.format(calendar.getTime());
}

/**
 * 
 * @return yyyy-MM-dd HH:mm 
 * 2012-12-29 23:47
 */
public static String getDateAndMinute() {
    SimpleDateFormat simple = new SimpleDateFormat("yyyy-MM-dd HH:mm");
    return simple.format(calendar.getTime());
}

/**
 * 
 * @return
 *  yyyy-MM-dd HH:mm:ss 
 *  2012-12-29 23:47:36
 */
public static String getFullDate() {
    SimpleDateFormat simple = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    return simple.format(calendar.getTime());
}

/**
 * 距离今天多久
 * @param date
 * @return 
 * 
 */
public static String fromToday(Date date) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);

    long time = date.getTime() / 1000;
    long now = new Date().getTime() / 1000;
    long ago = now - time;
    if (ago <= ONE_HOUR)
        return ago / ONE_MINUTE + "分钟前";
    else if (ago <= ONE_DAY)
        return ago / ONE_HOUR + "小时" + (ago % ONE_HOUR / ONE_MINUTE)
                + "分钟前";
    else if (ago <= ONE_DAY * 2)
        return "昨天" + calendar.get(Calendar.HOUR_OF_DAY) + "点"
                + calendar.get(Calendar.MINUTE) + "分";
    else if (ago <= ONE_DAY * 3)
        return "前天" + calendar.get(Calendar.HOUR_OF_DAY) + "点"
                + calendar.get(Calendar.MINUTE) + "分";
    else if (ago <= ONE_MONTH) {
        long day = ago / ONE_DAY;
        return day + "天前" + calendar.get(Calendar.HOUR_OF_DAY) + "点"
                + calendar.get(Calendar.MINUTE) + "分";
    } else if (ago <= ONE_YEAR) {
        long month = ago / ONE_MONTH;
        long day = ago % ONE_MONTH / ONE_DAY;
        return month + "个月" + day + "天前"
                + calendar.get(Calendar.HOUR_OF_DAY) + "点"
                + calendar.get(Calendar.MINUTE) + "分";
    } else {
        long year = ago / ONE_YEAR;
        int month = calendar.get(Calendar.MONTH) + 1;// JANUARY which is 0 so month+1
        return year + "年前" + month + "月" + calendar.get(Calendar.DATE)
                + "日";
    }

}

/**
 * 距离截止日期还有多长时间
 * 
 * @param date
 * @return
 */
public static String fromDeadline(Date date) {
    long deadline = date.getTime() / 1000;
    long now = (new Date().getTime()) / 1000;
    long remain = deadline - now;
    if (remain <= ONE_HOUR)
        return "只剩下" + remain / ONE_MINUTE + "分钟";
    else if (remain <= ONE_DAY)
        return "只剩下" + remain / ONE_HOUR + "小时"
                + (remain % ONE_HOUR / ONE_MINUTE) + "分钟";
    else {
        long day = remain / ONE_DAY;
        long hour = remain % ONE_DAY / ONE_HOUR;
        long minute = remain % ONE_DAY % ONE_HOUR / ONE_MINUTE;
        return "只剩下" + day + "天" + hour + "小时" + minute + "分钟";
    }

}

/**
 * 距离今天的绝对时间
 * 
 * @param date
 * @return
 */
public static String toToday(Date date) {
    long time = date.getTime() / 1000;
    long now = (new Date().getTime()) / 1000;
    long ago = now - time;
    if (ago <= ONE_HOUR)
        return ago / ONE_MINUTE + "分钟";
    else if (ago <= ONE_DAY)
        return ago / ONE_HOUR + "小时" + (ago % ONE_HOUR / ONE_MINUTE) + "分钟";
    else if (ago <= ONE_DAY * 2)
        return "昨天" + (ago - ONE_DAY) / ONE_HOUR + "点" + (ago - ONE_DAY)
                % ONE_HOUR / ONE_MINUTE + "分";
    else if (ago <= ONE_DAY * 3) {
        long hour = ago - ONE_DAY * 2;
        return "前天" + hour / ONE_HOUR + "点" + hour % ONE_HOUR / ONE_MINUTE
                + "分";
    } else if (ago <= ONE_MONTH) {
        long day = ago / ONE_DAY;
        long hour = ago % ONE_DAY / ONE_HOUR;
        long minute = ago % ONE_DAY % ONE_HOUR / ONE_MINUTE;
        return day + "天前" + hour + "点" + minute + "分";
    } else if (ago <= ONE_YEAR) {
        long month = ago / ONE_MONTH;
        long day = ago % ONE_MONTH / ONE_DAY;
        long hour = ago % ONE_MONTH % ONE_DAY / ONE_HOUR;
        long minute = ago % ONE_MONTH % ONE_DAY % ONE_HOUR / ONE_MINUTE;
        return month + "个月" + day + "天" + hour + "点" + minute + "分前";
    } else {
        long year = ago / ONE_YEAR;
        long month = ago % ONE_YEAR / ONE_MONTH;
        long day = ago % ONE_YEAR % ONE_MONTH / ONE_DAY;
        return year + "年前" + month + "月" + day + "天";
    }

}

public static String getYear() {
    return calendar.get(Calendar.YEAR) + "";
}

public static String getMonth() {
    int month = calendar.get(Calendar.MONTH) + 1;
    return month + "";
}

public static String getDay() {
    return calendar.get(Calendar.DATE) + "";
}

public static String get24Hour() {
    return calendar.get(Calendar.HOUR_OF_DAY) + "";
}

public static String getMinute() {
    return calendar.get(Calendar.MINUTE) + "";
}

public static String getSecond() {
    return calendar.get(Calendar.SECOND) + "";
}

public static void main(String[] args) throws ParseException {
    String deadline = "2012-12-30 12:45:59";
    Date date = new Date();
    SimpleDateFormat simple = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    date = simple.parse(deadline);
    System.out.println(DateUtils.fromDeadline(date));

    String before = "2012-12-12 0:0:59";
    date = simple.parse(before);
    System.out.println(DateUtils.fromToday(date));

    System.out.println(DateUtils.getFullDate());
    System.out.println(DateUtils.getDate());
}


}
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