Java获取当前时间/日期/时间戳及格式化总结，附代码

//时分秒
        LocalTime time = LocalTime.now();
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HH:mm:ss");
        System.out.println(time.format(formatter));

//年月日
        LocalDate date = LocalDate.now();
        DateTimeFormatter formatter1 = DateTimeFormatter.ofPattern("yyyy-MM-dd");
        System.out.println(date.format(formatter1));

//年月日时分秒
        //1
        LocalDateTime now = LocalDateTime.now();
        DateTimeFormatter formatter2 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        System.out.println(now.format(formatter2));

//2
        Date now1 = new Date();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        System.out.println(format.format(now1));

//3
        Date now2 = Calendar.getInstance().getTime();
        SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        System.out.println(format1.format(now2));

//当前时间戳，单位毫秒
        long l = System.currentTimeMillis();
        System.out.println(l);

//十位时间戳，单位：秒
long l = System.currentTimeMillis()/1000;
System.out.println(l);

//10位时间戳,单位:秒
long l = System.currentTimeMillis();
String s = (l + "").substring(0, 10);
System.out.println(s);

//获取时间戳
long l = System.currentTimeMillis();

//格式化
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String s = format.format(l);
System.out.println(s);

//当前秒数
        int i = Calendar.getInstance().get(Calendar.SECOND);
        System.out.println(i);