java的格式化时间工具类

短命女 2022-09-11 01:17 197阅读 0赞

代码：

public class DateTimeUtil { 
    
        private static final Logger logger = LoggerFactory.getLogger(DateTimeUtil.class);
        public static final String STANDER_FORMAT = "yyyy-MM-dd HH:mm:ss";
        public static final String STANDER_SHORT_FORMAT = "yyyy-MM-dd";
    
        public static Date addDuration(Date date, Duration duration) { 
            Calendar ca = Calendar.getInstance();
            ca.setTime(date);
            ca.add(Calendar.SECOND, (int) duration.getSeconds());
            return ca.getTime();
        }
    
        public static String dateFormat(Date date) { 
            if (null == date) { 
                return "";
            }
            DateFormat dateFormat = new SimpleDateFormat(STANDER_FORMAT);
            return dateFormat.format(date);
        }
    
        public static String dateShortFormat(Date date) { 
            if (null == date) { 
                return "";
            }
            DateFormat dateFormat = new SimpleDateFormat(STANDER_SHORT_FORMAT);
            return dateFormat.format(date);
        }
    
        public static Date parse(String dateStr, String format) { 
            try { 
                return new SimpleDateFormat(format).parse(dateStr);
            } catch (ParseException e) { 
                logger.error(e.getMessage(), e);
            }
            return null;
        }
    
        public static Date getMonthStartDay() { 
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd 00:00:00");
            Calendar cale = Calendar.getInstance();
            cale.add(Calendar.MONTH, 0);
            cale.set(Calendar.DAY_OF_MONTH, 1);
            String dateStr = formatter.format(cale.getTime());
            return parse(dateStr, "yyyy-MM-dd HH:mm:ss");
        }
    
        public static Date getMonthEndDay() { 
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd 23:59:59");
            Calendar cale = Calendar.getInstance();
            cale.add(Calendar.MONTH, 1);
            cale.set(Calendar.DAY_OF_MONTH, 0);
            String dateStr = formatter.format(cale.getTime());
            return parse(dateStr, STANDER_FORMAT);
        }
    
    
        public static List<String> MothStartToNowFormat() { 
            Date startTime = getMonthStartDay();
            Calendar nowCalendar = Calendar.getInstance();
            nowCalendar.setTime(new Date());
            int mothDayCount = nowCalendar.get(Calendar.DAY_OF_MONTH);
            List<String> mothDays = new ArrayList<>(mothDayCount);
            Calendar startCalendar = new GregorianCalendar();
            startCalendar.setTime(startTime);
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
            mothDays.add(formatter.format(startTime));
            for (int i = 0; i < mothDayCount - 1; i++) { 
                startCalendar.add(Calendar.DATE, 1);
                Date end_date = startCalendar.getTime();
                mothDays.add(formatter.format(end_date));
            }
            return mothDays;
        }
    
    
        public static List<String> MothDay() { 
            Calendar endCalendar = Calendar.getInstance();
            endCalendar.setTime(getMonthEndDay());
            int endMothDay = endCalendar.get(Calendar.DAY_OF_MONTH);
            List<String> list = new ArrayList<>(endMothDay);
            for (int i = 1; i <= endMothDay; i++) { 
                list.add(String.valueOf(i));
            }
            return list;
        }
    }
       public static final Date dateTime(final String format, final String ts)
        { 
            try
            { 
                return new SimpleDateFormat(format).parse(ts);
            }
            catch (ParseException e)
            { 
                throw new RuntimeException(e);
            }
        }
      /** * 日期型字符串转化为日期 格式 */
        public static Date parseDate(Object str)
        { 
            if (str == null)
            { 
                return null;
            }
            try
            { 
                return parseDate(str.toString(), parsePatterns);
            }
            catch (ParseException e)
            { 
                return null;
            }
        }
        
        /** * 获取服务器启动时间 */
        public static Date getServerStartDate()
        { 
            long time = ManagementFactory.getRuntimeMXBean().getStartTime();
            return new Date(time);
        }
    
        /** * 计算相差天数 */
        public static int differentDaysByMillisecond(Date date1, Date date2)
        { 
            return Math.abs((int) ((date2.getTime() - date1.getTime()) / (1000 * 3600 * 24)));
        }
    
        /** * 计算两个时间差 */
        public static String getDatePoor(Date endDate, Date nowDate)
        { 
            long nd = 1000 * 24 * 60 * 60;
            long nh = 1000 * 60 * 60;
            long nm = 1000 * 60;
            // long ns = 1000;
            // 获得两个时间的毫秒时间差异
            long diff = endDate.getTime() - nowDate.getTime();
            // 计算差多少天
            long day = diff / nd;
            // 计算差多少小时
            long hour = diff % nd / nh;
            // 计算差多少分钟
            long min = diff % nd % nh / nm;
            // 计算差多少秒//输出结果
            // long sec = diff % nd % nh % nm / ns;
            return day + "天" + hour + "小时" + min + "分钟";
        }
    //ManagementFactory 类是一种工厂类，用于获取 Java 平台的管理 Bean。此类由静态方法组成，每种静态方法都会返回一个或多个表示 Java 虚拟机组件的管理接口的平台 MXBean。

使用：

System.out.println(DateTimeUtil.dateShortFormat(user.getBirthDay())+"时间");

结果：  
![在这里插入图片描述][05bf85e428a94c8687e1c2cd9adc5942.png]

[05bf85e428a94c8687e1c2cd9adc5942.png]: /images/20220829/fbdf0f664aa1499f83a9165187e8a882.png