Socket programming in Java: A tutorial

This tutorial is an introduction to socket programming Java, starting with a simple client-server example demonstrating the basic features of Java I/O.  You’ll be introduced to both the original java.io package and NIO, the non-blocking I/O (java.nio) APIs introduced in Java 1.4. Finally, you’ll see an example that demonstrates Java networking as implemented from Java 7 forward, in NIO.2.

Socket programming boils down to two systems communicating with one another. Generally, network communication comes in two flavors: Transport Control Protocol (TCP) and User Datagram Protocol (UDP). TCP and UDP are used for different purposes and both have unique constraints:

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