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public interface UDPDatagramConnection
This interface defines a datagram connection which knows it's local end point
address. The protocol is transaction oriented, and delivery and duplicate
protection are not guaranteed. Applications requiring ordered reliable
delivery of streams of data should use the SocketConnection
.
A UDPDatagramConnection
is returned from
Connector.open()
in response to a request to open a
datagram://
URL connection string. If the connection string
omits both the host
and port
fields in the URL
string, then the system will allocate an available port. The local address
and the local port can be discovered using the accessor methods within this
interface.
The syntax described here for the datagram URL connection string is also
valid for the Datagram.setAddress()
method used to assign a
destination address to a Datagram
to be sent. e.g.,
datagram://
host:port
The URI must conform to the BNF syntax specified below. If the URI does not
conform to this syntax, an IllegalArgumentException
is thrown.
<datagram_connection_string> | ::= "datagram://" | "datagram://"<hostport> |
<hostport> | ::= host ":" port |
<host> | ::= host name or IP address (omitted for inbound connections) |
<port> | ::= numeric port number (omitted for system assigned port) |
Method Summary | |
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java.lang.String |
getLocalAddress()
Gets the local address to which the datagram connection is bound. |
int |
getLocalPort()
Returns the local port to which this datagram connection is bound. |
Methods inherited from interface javax.microedition.io.DatagramConnection |
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getMaximumLength, getNominalLength, newDatagram, newDatagram, newDatagram, newDatagram, receive, send |
Methods inherited from interface javax.microedition.io.Connection |
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close |
Method Detail |
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java.lang.String getLocalAddress() throws java.io.IOException
Gets the local address to which the datagram connection is bound. The
address MUST be returned in the format of the requested IP version. The
required IP version is specified by the MIDlet with
MIDlet-Required-IP-Version
manifest attribute. If the attribute
is not specified, the implementation MAY decide the format in which the
local address is returned.
The host address(IP number) that can be used to connect to this end of the datagram connection from an external system. Since IP addresses may be dynamically assigned, a remote application will need to be robust in the face of IP number reassignment.
The local hostname (if available) can be accessed from
System.getProperty("microedition.hostname")
java.io.IOException
- if the connection was closed.ServerSocketConnection
int getLocalPort() throws java.io.IOException
java.io.IOException
- if the connection was closed.ServerSocketConnection
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