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java.lang.Objectorg.apache.commons.net.DatagramSocketClient
org.apache.commons.net.ntp.NTPUDPClient
public final class NTPUDPClient
The NTPUDPClient class is a UDP implementation of a client for the Network Time Protocol (NTP) described in RFC 1305 as well as the Simple Network Time Protocol (SNTP) in RFC-2030. To use the class, merely open a local datagram socket with open and call getTime to retrieve the time. Then call close to close the connection properly. Successive calls to getTime are permitted without re-establishing a connection. That is because UDP is a connectionless protocol and the Network Time Protocol is stateless.
| Field Summary | |
|---|---|
static int |
DEFAULT_PORT
The default NTP port. |
| Fields inherited from class org.apache.commons.net.DatagramSocketClient |
|---|
_isOpen_, _socket_, _socketFactory_, _timeout_ |
| Constructor Summary | |
|---|---|
NTPUDPClient()
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| Method Summary | |
|---|---|
TimeInfo |
getTime(InetAddress host)
Retrieves the time information from the specified server on the default NTP port and returns it. |
TimeInfo |
getTime(InetAddress host,
int port)
Retrieves the time information from the specified server and port and returns it. |
int |
getVersion()
Returns the NTP protocol version number that client sets on request packet that is sent to remote host (e.g. |
void |
setVersion(int version)
Sets the NTP protocol version number that client sets on request packet communicate with remote host. |
| Methods inherited from class org.apache.commons.net.DatagramSocketClient |
|---|
close, getDefaultTimeout, getLocalAddress, getLocalPort, getSoTimeout, isOpen, open, open, open, setDatagramSocketFactory, setDefaultTimeout, setSoTimeout |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
|---|
public static final int DEFAULT_PORT
| Constructor Detail |
|---|
public NTPUDPClient()
| Method Detail |
|---|
public TimeInfo getTime(InetAddress host,
int port)
throws IOException
host - The address of the server.port - The port of the service.
IOException - If an error occurs while retrieving the time.
public TimeInfo getTime(InetAddress host)
throws IOException
host - The address of the server.
IOException - If an error occurs while retrieving the time.public int getVersion()
setVersion(int)public void setVersion(int version)
version - the NTP protocol version number
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