1.通过Date类来获取时间
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
String str=sdf.format(new Date());
System.out.println("当前时间是:"+str);
2.通过System类中的currentTimeMillis方法来获取当前时间
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
String str=sdf.format(System.currentTimeMillis());
System.out.println("当前时间是:"+str);
3.通过Calendar类来获取当前时间
Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR); int month = c.get(Calendar.MONTH)+1; int date = c.get(Calendar.DATE); int hour = c.get(Calendar.HOUR_OF_DAY); int minute = c.get(Calendar.MINUTE); int second = c.get(Calendar.SECOND); System.out.println(year + "-" + month + "-" + date + " " +hour + ":" +minute + ":" + second);(注意:月份从0开始所以要+1)
4. LocalDateTime类来获取当前时间
LocalDateTime dt = LocalDateTime.now();
int year = dt.getYear(); int month = dt.getMonthValue(); int date =dt.getDayOfMonth(); int hour = dt.getHour(); int minute = dt.getMinute(); int second = dt.getSecond(); System.out.println(year + "/" + month + "/" + date + " " +hour + ":" +minute + ":" + second);