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org.apache.commons.net

Class TimeUDPClient

public final class TimeUDPClient
extends DatagramSocketClient
The TimeUDPClient class is a UDP implementation of a client for the Time protocol described in RFC 868. To use the class, merely open a local datagram socket with open and call getTime or getDate to retrieve the time. Then call close to close the connection properly. Unlike TimeTCPClient , successive calls to getTime or getDate are permitted without re-establishing a connection. That is because UDP is a connectionless protocol and the Time protocol is stateless.

Author:
Daniel F. Savarese

See Also:
TimeTCPClient

Field Summary

static int
DEFAULT_PORT
The default time port.
static long
SECONDS_1900_TO_1970
The number of seconds between 00:00 1 January 1900 and 00:00 1 January 1970.
private byte[]
__dummyData
private byte[]
__timeData

Fields inherited from class org.apache.commons.net.DatagramSocketClient

__DEFAULT_SOCKET_FACTORY, _isOpen_, _socketFactory_, _socket_, _timeout_

Method Summary

Date
getDate(InetAddress host)
Same as getTime(host, DEFAULT_PORT); **
Date
getDate(InetAddress host, int port)
Retrieves the time from the server and returns a Java Date containing the time converted to the local timezone.
long
getTime(InetAddress host)
Same as getTime(host, DEFAULT_PORT); **
long
getTime(InetAddress host, int port)
Retrieves the time from the specified server and port and returns it.

Methods inherited from class org.apache.commons.net.DatagramSocketClient

close, getDefaultTimeout, getLocalAddress, getLocalPort, getSoTimeout, isOpen, open, open, open, setDatagramSocketFactory, setDefaultTimeout, setSoTimeout

Field Details

DEFAULT_PORT

public static final int DEFAULT_PORT
The default time port. It is set to 37 according to RFC 868. **

Field Value:
37

SECONDS_1900_TO_1970

public static final long SECONDS_1900_TO_1970
The number of seconds between 00:00 1 January 1900 and 00:00 1 January 1970. This value can be useful for converting time values to other formats.

Field Value:
2208988800L

__dummyData

private byte[] __dummyData

__timeData

private byte[] __timeData

Method Details

getDate

public Date getDate(InetAddress host)
            throws IOException
Same as getTime(host, DEFAULT_PORT); **

getDate

public Date getDate(InetAddress host,
                    int port)
            throws IOException
Retrieves the time from the server and returns a Java Date containing the time converted to the local timezone.

Parameters:
host - The address of the server.
port - The port of the service.

Returns:
A Date value containing the time retrieved from the server converted to the local timezone.

getTime

public long getTime(InetAddress host)
            throws IOException
Same as getTime(host, DEFAULT_PORT); **

getTime

public long getTime(InetAddress host,
                    int port)
            throws IOException
Retrieves the time from the specified server and port and returns it. The time is the number of seconds since 00:00 (midnight) 1 January 1900 GMT, as specified by RFC 868. This method reads the raw 32-bit big-endian unsigned integer from the server, converts it to a Java long, and returns the value.

Parameters:
host - The address of the server.
port - The port of the service.

Returns:
The time value retrieved from the server.

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