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;
      }
   
  }