java 获取当前日期时间_java builder 生成当前日期-优快云博客

本文介绍了一个简单的Java类MyDate，该类提供了获取当前日期时间字符串的方法及将指定日期时间转换为毫秒的方法。通过实例演示了如何使用这些方法来获取当前的时间信息并将其转换为毫秒。

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public class MyDate {
	
	private static String[] week=
	{
		"日","一","二","三","四","五","六"		
	};
	
	// 获取当前日期和时间
	public static String getCurrentDateStr()
	{
		StringBuilder dateStr = new StringBuilder();
		Calendar calendar = Calendar.getInstance();
		
		dateStr.append(calendar.get(Calendar.YEAR)+"年 ")
		       .append(calendar.get(Calendar.MONTH)+1+"月 ")
		       .append(calendar.get(Calendar.DAY_OF_MONTH)+"日 ")
		       .append("星期"+week[calendar.get(Calendar.DAY_OF_WEEK)-1])
		       .append((calendar.get(Calendar.AM_PM)==Calendar.AM)?" 上午 ":" 下午 ")
		       .append(calendar.get(Calendar.HOUR)+":")
		       .append(calendar.get(Calendar.MINUTE));
		return dateStr.toString();
	}
	
	// 将日期时间转换成毫秒
	public static long getMillisecond(int year, int month, int dayOfMonth, int hour, int minute)
	{
		Calendar calendar = Calendar.getInstance();
		calendar.set(year,month,dayOfMonth,hour,minute);
		return calendar.getTimeInMillis();
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {

		Calendar calendar = Calendar.getInstance();
		long mi = getMillisecond(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),
				calendar.get(Calendar.DAY_OF_MONTH),calendar.get(Calendar.HOUR_OF_DAY),calendar.get(Calendar.MINUTE));
		
		System.out.println("-------"+mi);
		
		calendar.setTimeInMillis(mi);
		
		System.out.println(calendar.toString());
		
	}
	

}