Introduction to Sockets “A socket is one endpoint of a two-way communication link between two programs running on the network. A socket is bound to a port.

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Presentation transcript:

Introduction to Sockets “A socket is one endpoint of a two-way communication link between two programs running on the network. A socket is bound to a port number so that the TCP layer can identify the application to which data is destined to be sent.”

Networking Review TCP/IP Protocol Suite Application programming interface to TCP/IP (API) BSD Unix Java.net.Socket Platform Independence

Ports TCP and UDP use ports to map incoming data to a particular process running on the computer Ports are 16 bit numbers Need IP Address (32-bits) and port Restricted out of 65,535.

Networking Classes in Java TCP: URL, URLConnection, Socket, ServerSocket UDP: DatagramPacket, DatagramSocket, MulticastSocket Socket and ServerSocket form two ends of communicaiton link.

Procedure Open a socket Open an input and output stream to the socket Read from and write to the stream according to the server’s protocol close streams close socket