如何使用 Internet 时间服务器获取时间? [英] How to use an Internet time server to get the time?

问题描述

我想获得 GMT [格林威治标准时间]，而且我不想依赖我的系统日期时间.基本上，我想使用像 in.pool.ntp.org [ India ] 这样的时间同步服务器进行 GMT 计算，或者我可能走错了方向！

如何在java中做到这一点?

是否有任何 Java 库可以从时间服务器获取时间?

解决方案

sp0d 不太对:

timeInfo.getReturnTime();//返回本地机器收到消息包的时间

所以它只返回当前系统时间，而不是接收到的时间.参见 TimeInfo man页.
你应该使用

timeInfo.getMessage().getTransmitTimeStamp().getTime();

相反.
所以代码块将是:

String TIME_SERVER = "time-a.nist.gov";NTPUDPClient timeClient = new NTPUDPClient();InetAddress inetAddress = InetAddress.getByName(TIME_SERVER);TimeInfo timeInfo = timeClient.getTime(inetAddress);long returnTime = timeInfo.getMessage().getTransmitTimeStamp().getTime();日期时间 = 新日期(返回时间)；

I would like to get the GMT [ Greenwich Mean Time ], and also I don't want to rely on my system date time for that. Basically, I want to use time sync server like in.pool.ntp.org [ India ] for GMT calculation, or may be I am going in wrong direction!

How to do this in java ?

Is there any java library to get time from Time server?

解决方案

sp0d is not quite right:

timeInfo.getReturnTime(); // Returns time at which time message packet was received by local machine

So it just returns current system time, not the received one. See TimeInfo man page.
You should use

timeInfo.getMessage().getTransmitTimeStamp().getTime();

instead.
So the code block will be:

String TIME_SERVER = "time-a.nist.gov";   
NTPUDPClient timeClient = new NTPUDPClient();
InetAddress inetAddress = InetAddress.getByName(TIME_SERVER);
TimeInfo timeInfo = timeClient.getTime(inetAddress);
long returnTime = timeInfo.getMessage().getTransmitTimeStamp().getTime();
Date time = new Date(returnTime);

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