Building Java Client/Server Applications with TCP. Part 2

The second article in our series on Building Java Client/Server Applications with TCP.

2. Sockets programming in Java

A network socket is an internal endpoint for sending or receiving data within a node on a computer network.

When a Java program would like to establish a TCP connection between two computers with sockets, the following steps need to be covered:

• The server instantiates the ServerSocket class with the port number.
• The server invokes the accept() method of the ServerSocket class and waits until a client connects to the server on the given port.
• The client instantiates the Socket class, attempting to connect to the specified server and the port number.
• On the server side, the accept() method returns a reference to a new socket, to be connected to the client socket.
• On the server side, the accept() method returns a reference to a new socket, to be connected to the client socket.

The ServerSocket class can be instantiated through the constructors presented in the table below:

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