Date d = new Date();
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd kk:mm:ss ");
sdf.setTimeZone(TimeZone.getTimeZone("Asia/Shanghai")); //格式差8小时
System.out.println(sdf.format(d));

或者：

    Calendar now = Calendar.getInstance();
    now.setTimeZone(TimeZone.getTimeZone("Asia/Shanghai"));//格式差8小时
    System.out.println(now.get(Calendar.HOUR_OF_DAY));
    System.out.println(now.get(Calendar.MINUTE));
    System.out.println(now.get(Calendar.SECOND));