Building Java Client/Server Applications with TCP

Abstract: TCP (Transmission Control Protocol) is a connection-based protocol that provides a reliable flow of data between two computers. It also provides a point-to-point channel for applications that require reliable communications. The Java programming language supports, through the java.net package, a suitable API for developing client/server applications that use this protocol for communication.

1.The principles of the TCP protocol

The TCP protocol requires the establishment of a session between the client and the server. A session essentially is a mechanism to get some data, so we are setting up a specialized communication session.

TCP behaves so similarly to a conversation on the phone.

• Pick up the phone
• Wait for the dial tone
• Dial the number
• Phone rings
• Pick up the phone
• Say hello
• Start the conversation
• Repeat if you haven’t understood something

A three-way handshake (or TCP handshake) is a method used in a TCP/IP network to create a connection between a local host/client and server. It is a three-step method that requires both the client and server to exchange SYN and ACK (acknowledgment) packets before actual data communication begins.

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