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

Source: Internet
Author: User

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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123456789101112131415   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

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