自定义date工具类 DateUtils.java

自定义date工具类 DateUtils.java

简介

• Date日期类型的工具类。

api

• 日期格式化 format(Date date)；
• 日期格式化 format(Date date, String pattern)；
• 计算距离现在多久，非精确 getTimeBefore(Date date);
• 计算距离现在多久，精确 getTimeBeforeNow(Date date);

源码

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;
    }
 
}