几秒前，几分钟前，几小时前，几天前，几月前，几年前的实现

以前有牛人分享的代码：

java实现几分钟前，几小时前，几天前的代码

有点复杂，所以在stackoverflow上找了一个简单的，改写了下符合需求，给大家分享下。

01 package com.date;
02
03 import java.text.ParseException;
04 import java.text.SimpleDateFormat;
05 import java.util.Date;
06
07 public class RelativeDateFormat {
08
09     private static final long ONE_MINUTE = 60000L;
10     private static final long ONE_HOUR = 3600000L;
11     private static final long ONE_DAY = 86400000L;
12     private static final long ONE_WEEK = 604800000L;
13
14     private static final String ONE_SECOND_AGO = "秒前";
15     private static final String ONE_MINUTE_AGO = "分钟前";
16     private static final String ONE_HOUR_AGO = "小时前";
17     private static final String ONE_DAY_AGO = "天前";
18     private static final String ONE_MONTH_AGO = "月前";
19     private static final String ONE_YEAR_AGO = "年前";
20
21     public static void main(String[] args) throws ParseException {
22         SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:m:s");
23         Date date = format.parse("2013-11-11 18:35:35");
24         System.out.println(format(date));
25     }
26
27     public static String format(Date date) {
28         long delta = new Date().getTime() - date.getTime();
29         if (delta < 1L * ONE_MINUTE) {
30             long seconds = toSeconds(delta);
31             return (seconds <= 0 ? 1 : seconds) + ONE_SECOND_AGO;
32         }
33         if (delta < 45L * ONE_MINUTE) {
34             long minutes = toMinutes(delta);
35             return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_AGO;
36         }
37         if (delta < 24L * ONE_HOUR) {
38             long hours = toHours(delta);
39             return (hours <= 0 ? 1 : hours) + ONE_HOUR_AGO;
40         }
41         if (delta < 48L * ONE_HOUR) {
42             return "昨天";
43         }
44         if (delta < 30L * ONE_DAY) {
45             long days = toDays(delta);
46             return (days <= 0 ? 1 : days) + ONE_DAY_AGO;
47         }
48         if (delta < 12L * 4L * ONE_WEEK) {
49             long months = toMonths(delta);
50             return (months <= 0 ? 1 : months) + ONE_MONTH_AGO;
51         } else {
52             long years = toYears(delta);
53             return (years <= 0 ? 1 : years) + ONE_YEAR_AGO;
54         }
55     }
56
57     private static long toSeconds(long date) {
58         return date / 1000L;
59     }
60
61     private static long toMinutes(long date) {
62         return toSeconds(date) / 60L;
63     }
64
65     private static long toHours(long date) {
66         return toMinutes(date) / 60L;
67     }
68
69     private static long toDays(long date) {
70         return toHours(date) / 24L;
71     }
72
73     private static long toMonths(long date) {
74         return toDays(date) / 30L;
75     }
76
77     private static long toYears(long date) {
78         return toMonths(date) / 365L;
79     }
80
81 }

有需要的可以下载，可以自己修改测试代码测试。

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