import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;/*** @说明：Date工具类*/
public class DateUtils {public final static String format_1 = "yyyy-MM-dd";public final static String format_2 = "yyyy-MM-dd HH:mm:ss";public static void main(String[] args) throws ParseException {System.err.println(format(new Date()));System.out.println(getTimeBeforeNow(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2020-08-16 12:17:43")));System.out.println(getTimeBefore(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2020-08-16 12:17:43")));}public static String format(Date date) {return format(date, format_1);}public static String format(Date date, String pattern) {if (date != null) {SimpleDateFormat df = new SimpleDateFormat(pattern);return df.format(date);}return null;}/*** 方法功能说明：@1.计算距离现在多久，非精确* "126天前"*/public static String getTimeBefore(Date date) {Date now = new Date();long l = now.getTime() - date.getTime();long day = l / (24 * 60 * 60 * 1000);long hour = (l / (60 * 60 * 1000) - day * 24);long min = ((l / (60 * 1000)) - day * 24 * 60 - hour * 60);long s = (l / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);String r = "";if (day > 0) {r += day + "天";} else if (hour > 0) {r += hour + "小时";} else if (min > 0) {r += min + "分";} else if (s > 0) {r += s + "秒";}r += "前";return r;}/*** 方法功能说明：@1.计算距离现在多久，精确* "126天10小时27分28秒前"*/public static String getTimeBeforeNow(Date date) {Date now = new Date();long l = now.getTime() - date.getTime();long day = l / (24 * 60 * 60 * 1000);long hour = (l / (60 * 60 * 1000) - day * 24);long min = ((l / (60 * 1000)) - day * 24 * 60 - hour * 60);long s = (l / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);String r = "";if (day > 0) {r += day + "天";}if (hour > 0) {r += hour + "小时";}if (min > 0) {r += min + "分";}if (s > 0) {r += s + "秒";}r += "前";return r;}}
