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What Is examples.ntp.NTPClient.java
What is examples.ntp.NTPClient.java? Can I use it to get the current time?
✍: FYIcenter.com
examples.ntp.NTPClient.java is an example program
demonstrating how to use the NTPUDPClient class.
This program sends a Datagram client request packet to a Network time Protocol (NTP) service port on a specified server, retrieves the time, and prints it to standard output along with the fields from the NTP message header (e.g. stratum level, reference id, poll interval, root delay, mode, ...) See RFC 868 for details.
You can follow these steps to download, view and run examples.telnet.WeatherTelnet.java program.
1. Download commons-net-3.5-bin.zip file from Apache Commons Net.
2. Unzip all files from commons-net-3.5-bin.zip, and install them to C:\local. You should see C:\local\commons-net-3.5 folder with two JAR files and "examples" sub folder:
05/01/2016 11:37 PM 303,658 commons-net-3.5.jar 05/01/2016 11:37 PM 82,453 commons-net-examples-3.5.jar 05/01/2016 11:37 PM <DIR> examples
3. View C:\local\commons-net-3.5\examples\ntp\NTPClient.java with a text editor.
4. Run NTPClient.java in command window with both JAR files included in the classpath:
C:\fyicenter> java -cp .;C:\local\commons-net-3.5\commons-net-3.5.jar ;C:\local\commons-net-3.5\commons-net-examples-3.5.jar examples.ntp.NTPClient Usage: NTPClient <hostname-or-address-list>
5. Get the current time from clock.psu.edu NTP server:
C:\fyicenter> java -cp .;C:\local\commons-net-3.5\commons-net-3.5.jar ;C:\local\commons-net-3.5\commons-net-examples-3.5.jar examples.ntp.TimeClient clock.psu.edu > clock.psu.edu/128.118.25.3 Stratum: 2 (Secondary Reference; e.g. via NTP or SNTP) leap=0, version=3, precision=-23 mode: Server (4) poll: 8 seconds (2 ** 3) rootdelay=37.26, rootdispersion(ms): 39.35 Reference Identifier: 128.4.1.1 (rackety.udel.edu) Reference Timestamp: dbdb3a67.688f5664 Sat, Nov 19 2016 15:53:59.408 Originate Timestamp: dbdb3b10.828f5c28 Sat, Nov 19 2016 15:56:48.510 Receive Timestamp: dbdb3b12.dcb96209 Sat, Nov 19 2016 15:56:50.862 Transmit Timestamp: dbdb3b12.dcbb478d Sat, Nov 19 2016 15:56:50.862 Destination Timestamp: dbdb3b10.96872b02 Sat, Nov 19 2016 15:56:48.588 Roundtrip delay(ms)=78, clock offset(ms)=2313
⇒ FAQ for Apache commons-net.jar
⇐ What Is examples.ntp.TimeClient.java
2017-04-08, 3878🔥, 0💬
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