Getting the Local Address and Port Number in Java

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1571 Getting the Local Address and Port Number
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An application can get the local host address and port number for an open connection (This information is needed primarily for applications that use UDPDatagramConnections to allow clients to send datagrams to a dynamically assigned port) The getLocalAddress method returns the local IP number to which the socket is bound Calling the method SystemgetProperty("microeditionhostname") returns the host name of the device, if it is available The getLocalPort method returns the local port to which this socket is bound
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If an application sends address and port information to a remote application so that it can connect to the device, the application should try to send the host name of the device IP addresses can be dynamically assigned, so a remote application with only an IP address will not be able to make contact if the device IP number changes If a host name is available, sending it would help the remote application be more robust
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1572 Datagrams
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The UDPDatagramConnection interface inherits methods to create, send, and receive datagrams from the interface javaxmicroeditionioDatagramConnection Once created, a datagram can be used and reused for reading or writing A Datagram consists of an address and a data buffer The address is a URL string in the same syntax as described for the method Connectoropen If the datagram will be sent, the application uses the DatagramsetAddress method to assign a destination address (The address must include both the host and port) If the Datagram was received, the address contains the source address
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The data buffer is a byte array with an offset and a length An application can access the byte array either directly or indirectly through the datagram's DataInputStream for reading and DataOutputStream for writing The datagram's getOffset and setOffset methods are the accessor methods for the offset of the first byte of data The getLength and setLength methods are the accessor methods for the number of bytes of data in the datagram The data buffer, offset, and length must be set before the Datagram is sent Before receiving a Datagram, the buffer, offset, and length must also be set to indicate the bytes available to store the incoming message
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158 CommConnection
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The CommConnection interface defines an API for a logical serial port connection The CommConnection extends the StreamConnection interface, through which bytes are transferred using input and output streams The underlying operating system defines the logical serial ports that can be used Such a port does not need to correspond to a physical RS-232 serial port For instance, IrDA IRCOMM ports are commonly configured as logical serial ports within the device An application opens a serial port by calling the Connectoropen method The application must provide a URI string that begins with "comm:" followed by a port identifier, followed optionally by a semicolon and a semicolon-separated list of parameter-value pairs The name of a parameter is separated from its value with an equals sign (=) Spaces are not allowed in the string For example, "comm:COM0;baudrate=19200" is a valid string
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The port identifier is a logical device name defined by the device Port identifiers will probably be device-specific, so applications should use them with care (See Section 1583, "Recommended Convention for Naming Ports") Applications can get a comma-separated list of valid port identifiers for a particular device and operating system by calling the SystemgetProperty method with the key microeditioncommports
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Any additional parameters must be separated by a semicolon If a particular optional parameter is not applicable to a particular port, the device is permitted to ignore it Legal parameters are listed in Table 153 If the application supplies an illegal or unrecognized parameter, the Connectoropen method throws an IllegalArgumentException If the device supports a parameter value, it must be honored If the device does not support a parameter value, the Connectoropen method throws a javaioIOException If an option duplicates a previous option, the last value overrides the previous value
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Table 153 CommConnection parameters for opening serial connections Parameter baudrate Default platform dependent Description Speed of the port in bits per second (such as 9600 or 19200) Number of bits per character (7 or 8) Number of stop bits per char (1 or 2) Parity (even, odd, or none) Whether to wait for a full buffer (on, which means wait, or off, which
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