写一个时间格式化的类

逃离我推掉我的手 2021-09-27 11:58 261阅读 0赞

package visoup.framework.util;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    /**
     * <br>
     * 
     * @author VISO DEV
     * @version 1.0
     */
    
    public class DateUtil
    {
    	public static final String patternLong = "yyyy-MM-dd HH:mm:ss";
    	public static final String patternShort = "yyyy-MM-dd";
    
    	/**
    	 * 日
    	 */
    	public final static int INTERVAL_DAY = 1;
    	/**
    	 * 周
    	 */
    	public final static int INTERVAL_WEEK = 2;
    	/**
    	 * 月
    	 */
    	public final static int INTERVAL_MONTH = 3;
    	/**
    	 * 年
    	 */
    	public final static int INTERVAL_YEAR = 4;
    	/**
    	 * 小时
    	 */
    	public final static int INTERVAL_HOUR = 5;
    	/**
    	 * 分钟
    	 */
    	public final static int INTERVAL_MINUTE = 6;
    	/**
    	 * 秒
    	 */
    	public final static int INTERVAL_SECOND = 7;
    
    	/**
    	 * 增加时间
    	 * 
    	 * @param interval
    	 *            [INTERVAL_DAY,INTERVAL_WEEK,INTERVAL_MONTH,INTERVAL_YEAR,
    	 *            INTERVAL_HOUR,INTERVAL_MINUTE]
    	 * @param date
    	 * @param n
    	 *            可以为负数
    	 * @return
    	 */
    	public static Date dateAdd(int interval, Date date, int n)
    	{
    		long time = (date.getTime() / 1000); // 单位秒
    		switch (interval)
    		{
    		case INTERVAL_DAY:
    			time = time + n * 86400;// 60 * 60 * 24;
    			break;
    		case INTERVAL_WEEK:
    			time = time + n * 604800;// 60 * 60 * 24 * 7;
    			break;
    		case INTERVAL_MONTH:
    			time = time + n * 2678400;// 60 * 60 * 24 * 31;
    			break;
    		case INTERVAL_YEAR:
    			time = time + n * 31536000;// 60 * 60 * 24 * 365;
    			break;
    		case INTERVAL_HOUR:
    			time = time + n * 3600;// 60 * 60 ;
    			break;
    		case INTERVAL_MINUTE:
    			time = time + n * 60;
    			break;
    		case INTERVAL_SECOND:
    			time = time + n;
    			break;
    		default:
    		}
    
    		Date result = new Date();
    		result.setTime(time * 1000);
    		return result;
    	}
    
        //带有时分秒的时间
    	public static String longToDateStr(long value)
    	{
    		return longToDateStr(value, patternShort);
    	}
        //只有日期的时间
    	public static String longToDateShortStr(long value)
    	{
    		return longToDateStr(value, patternLong);
    	}
    	
    	public static String longToDateStr(long value, boolean out0)
    	{
    		if (out0)
    		{
    			int ymd = (int) (value / 1000000);
    			long ymdl = ymd * 1000000L;
    			if (ymdl != value)
    			{
    				return longToDateStr(value);
    			}
    			else
    			{
    				return longToDateStryMd(value);
    			}
    		}
    		else
    		{
    			return longToDateStr(value);
    		}
    	}
    
    	public static String longToDateStryMd(long value)
    	{
    		return longToDateStr(value, patternShort);
    	}
    
    	public static String longToDateStr(long value, String pattern)
    	{
    		if (value == 0)
    		{
    			return null;
    		}
    		Calendar cal = Calendar.getInstance();
    		cal.setTimeInMillis(value);
    		SimpleDateFormat format = new SimpleDateFormat(pattern);
    		return format.format(cal.getTime());
    	}
        
    	public static long dateStrToLong(String str)
    	{
    		if (str == null || "".equals(str.trim()))
    		{
    			return 0;
    		}
    		if (str.trim().length() == 10)
    		{
    			str = str.trim() + " 00:00:00";
    		}
    		Date date = null;
    		SimpleDateFormat sdf = new SimpleDateFormat(patternLong);
    		try
    		{
    			date = sdf.parse(str);
    		}
    		catch (ParseException e)
    		{
    			e.printStackTrace();
    		}
    
    		return date.getTime();
    	}
    
    	public static String getNow(String pattern)
    	{
    		SimpleDateFormat format = new SimpleDateFormat(pattern);
    		return format.format(new Date());
    	}
    }

如果想格式化时间为日期形式yyyy-MM-dd 那么调用              DateUtil.longToDateStr

如果想格式化时间为日期时间形式 yyyy-MM-dd HH:mm:ss   DateUtil.longToDateShortStr