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Java ServerSocket Class

Last Updated : 4 Feb, 2026

ServerSocket in Java is used to create server-side socket connections in a client–server model. It allows a server to listen for incoming client requests on a specific port and throws an exception if the port is unavailable.

  • Provides a system-independent way to implement server-side networking.
  • In java.nio.channels, it is associated with a ServerSocketChannel.
  • In java.rmi.server, it creates server sockets for RMI communication.
  • In javax.net, it supports creating unbound sockets or sockets bound to a port with optional backlog and local IP settings.

Server-Side Programming

Working of server-side programming using ServerSocket class.

Output:

👁 Server side Output

Explanation: In the above example, it demonstrates a basic server-side implementation using the ServerSocket class. It listens on port 6666, accepts a client connection, reads a message sent by the client, and then closes the connection.

Client-Side Programming

Working of client-side programming using ServerSocket class.

Output:

👁 Client side Output

Explanation: In the above example, it demonstrates a basic client-side implementation using the Socket class. It connects to a server at localhost on port 6666, sends a message "Hello GFG Readers!", and then closes the connection.

Methods of Java ServerSocket

MethodDescription
accept()Listens for a connection to be made to this socket and accepts it.
bind(SocketAddress endpoint)Binds the ServerSocket to a specific address (IP address and port number).
bind(SocketAddress endpoint, int backlog)Binds the ServerSocket to a specific address (IP address and port number) and requests queqe length. If a request arrives when the queue is full then the request will be rejected by the server.
close()Closes this socket
getChannel()Returns the unique ServerSocketChannel object associated with this socket, if any.
getInetAddress()Returns the local address of this server socket.
getLocalPort()Returns the port number on which this socket is listening.
getLocalSocketAddress()Returns the address of the endpoint this socket is bound to, or null if it is not bound yet.
getReceiveBufferSize()Gets the value of the SO_RCVBUF option for this ServerSocket, that is the proposed buffer size that will be used for Sockets accepted from this ServerSocket.
getReuseAddress()Tests if SO_REUSEADDR is enabled.
getSoTimeout()Retrieve setting for SO_TIMEOUT.
implAccept(Socket s)Subclasses of ServerSocket use this method to override accept() to return their own subclass of the socket.
isBound()Returns the binding state of the ServerSocket.
isClosed()Returns the closed state of the ServerSocket.
setPerformancePreferences(int connectionTime, int latency, int bandwidth)Sets performance preferences for this ServerSocket
Sets performance preferences for this ServerSocketSets a default proposed value for the SO_RCVBUF option for sockets accepted from this ServerSocket.
setReuseAddress(boolean on)Enable/disable the SO_REUSEADDR socket option.
setSocketFactory(SocketImplFactory fac)Sets the server socket implementation factory for the application.
setSoTimeout(int timeout)Enable/disable SO_TIMEOUT with the specified timeout, in milliseconds.
toString()Returns the implementation address and implementation port of this socket as a String.
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