自定义date工具类 DateUtils.java

深碍√TFBOYSˉ_ 2024-03-24 19:08 66阅读 0赞

## 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;
            }
         
        }