把时间改为**秒前、**分钟前的工具类

• 因为我们之前的博客项目是需要实现那个发布时间的显示的。然后为了更加直观，我就弄个工具类。在我将所有的文章遍历出来的同时，然后把时间set为工具类转出的时间。然后就实现了想要的效果。
  

废话不多说，直接上代码

package com.lxs.Utils;

import com.lxs.pojo.article.Article;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

/** * 将时间转化为***前的格式 */
public class TimeCountUtil {
   

    private static final long ONE_MINUTE = 60000L;
    private static final long ONE_HOUR = 3600000L;
    private static final long ONE_DAY = 86400000L;
    private static final long ONE_WEEK = 604800000L;

    private static final String ONE_SECOND_AGO = "秒前";
    private static final String ONE_MINUTE_AGO = "分钟前";
    private static final String ONE_HOUR_AGO = "小时前";
    private static final String ONE_DAY_AGO = "天前";
    private static final String ONE_MONTH_AGO = "月前";
    private static final String ONE_YEAR_AGO = "年前";

    //自创工具类将文章中的时间转换为倒计时格式
    public static List<Article> addTime(List<Article> articles){
   
        for (Article article : articles) {
   
            article.setArticle_date(timeCount(article.getArticle_date()));
        }
        return articles;
    }

    //实际调用方法
    //将String类型的时间转换成date类型的
    public static String timeCount(String time) {
   
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = null;
        try {
   
            date = format.parse(time);
        } catch (ParseException e) {
   
            e.printStackTrace();
        }
        String switchTime = format(date);
        System.out.println();
        return switchTime;
    }

  /* public String timeCount(Date dateTime) { String format = format(dateTime); return format; }*/

    //时间转换
    public static String format(Date date) {
   
        long delta = new Date().getTime() - date.getTime();
        if (delta < 1L * ONE_MINUTE) {
   
            long seconds = toSeconds(delta);
            return (seconds <= 0 ? 1 : seconds) + ONE_SECOND_AGO;
        }
        if (delta < 45L * ONE_MINUTE) {
   
            long minutes = toMinutes(delta);
            return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_AGO;
        }
        if (delta < 24L * ONE_HOUR) {
   
            long hours = toHours(delta);
            return (hours <= 0 ? 1 : hours) + ONE_HOUR_AGO;
        }
        if (delta < 48L * ONE_HOUR) {
   
            return "昨天";
        }
        if (delta < 30L * ONE_DAY) {
   
            long days = toDays(delta);
            return (days <= 0 ? 1 : days) + ONE_DAY_AGO;
        }
        if (delta < 12L * 4L * ONE_WEEK) {
   
            long months = toMonths(delta);
            return (months <= 0 ? 1 : months) + ONE_MONTH_AGO;
        } else {
   
            long years = toYears(delta);
            return (years <= 0 ? 1 : years) + ONE_YEAR_AGO;
        }
    }

    private static long toSeconds(long date) {
   
        return date / 1000L;
    }

    private static long toMinutes(long date) {
   
        return toSeconds(date) / 60L;
    }

    private static long toHours(long date) {
   
        return toMinutes(date) / 60L;
    }
    private static long toDays(long date) {
   
        return toHours(date) / 24L;
    }

    private static long toMonths(long date) {
   
        return toDays(date) / 30L;
    }
    private static long toYears(long date) {
   
        return toMonths(date) / 365L;
    }
}

非常好用！