Socket Network Communication

<< JDK (Java Development Kit) Tutorials

This chapter provides tutorial notes and example codes on socket network communication. Topics include introduction to socket communication; creating a server socket and listening for connection requests; creating a client socket and connects to a server socket; creating server application for multiple connections; sample programs: ReverseEchoer.java, SocketClient.java, and ReverseEchoServer.java.

What Is a Socket?

Establishing a Socket Communication Link

ReverseEchoer.java - A Simple Server Socket Application

SocketClient.java - A Simple Client Socket Application

ReverseEchoServer.java - A Multi-Connection Socket Server

Binding Sockets to Specific Ports

Conclusion:

• JDK java.net.ServerSocket class allows us to create a server socket with bind() and accept() methods.
• JDK java.net.Socket class allows us to create a client socket with bind() and connect() methods.
• The "telnet" command program is a nice tool to send socket connection requests to server sockets.
• To handle multiple connections, the server application must run a separate thread for each new connection.

Notes and sample codes bellow are based on JDK/J2SDK 1.4.1_01.