The Java code gets the NTP server time, And the java code gets the ntp

The Java code gets the NTP server time, And the java code gets the ntp

The apache commons-net package contains ntp-related implementation classes, including:

1	org.apache.commons.net.ntp.NTPUDPClient

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1	org.apache.commons.net.ntp.TimeInfo

Related methods in NTPUDPClient:

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1	TimeInfo getTime(InetAddress host, int port) throws IOException

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1	TimeInfo getTime(InetAddress host) throws IOException

The second overload method uses the Protocol Specification default port 123.

Java code segment:

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public static void main(String[] args) throws IOException {  try {   NTPUDPClient timeClient = new NTPUDPClient();   String timeServerUrl = "202.120.2.101";   InetAddress timeServerAddress = InetAddress.getByName(timeServerUrl);   TimeInfo timeInfo = timeClient.getTime(timeServerAddress);   TimeStamp timeStamp = timeInfo.getMessage().getTransmitTimeStamp();   Date date = timeStamp.getDate();   System.out.println(date);   DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");   System.out.println(dateFormat.format(date));  } catch (UnknownHostException e) {   e.printStackTrace();  } }

The running result is:

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12	Thu Dec 03 16:16:50 CST 20152015-12-03 04:16:50

Appendix: Frequently Used NTP server address with fast speed:

Ntp.sjtu.edu.cn 202.120.2.101 (address of the NTP server in the Network Center of Shanghai Jiao Tong University))

Time-a.nist.gov NIST, Gaithersburg, Maryland time-b.nist.gov 129.6.15.29 NIST, Gaithersburg, Maryland time-a.timefreq.bldrdoc.gov 13.03.4.101 NIST, Boulder, Colorado time-b.timefreq.bldrdoc.gov 13.03.4.102 NIST, Boulder, Colorado time-c.timefreq.bldrdoc.gov 13.03.4.103 NIST, Boulder, Colorado