Java Socket getLocalSocketAddress() method

The getLocalSocketAddress() method of Java Socket class returns the address of the endpoint to which this socket is bound. This method will continue to return an InetSocketAddress even after the socket is closed.

Syntax

Parameter

Return

The getLocalSocketAddress() method returns:

the SocketAddress, representing the local endpoint of this socket.
null, if the socket is not bounded.
loopback SocketAddress, if it is denied by the security manager.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketGetLocalSocketAddressExample1  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the  socket with the inetAddress and port number
        socket.bind(socketAddress);
        socket.connect(socketAddress);
        //getPort() method will return the port number of this socket
        System.out.println("Local Port number: "+socket.getLocalPort());
        //getLocalSocketAddress() returns the address of the endpoint to which this socket is bound
        System.out.println("Local socket address: "+socket.getLocalSocketAddress());
    }
}

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Output:

Local Port number: 1085
Local socket address: /127.0.0.1:1085

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketGetLocalSocketAddressExample2  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        //passing null
        InetAddress inetAddress=null;
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the  socket with the inetAddress and port number
        socket.bind(socketAddress);
        socket.connect(socketAddress);
        //getPort() method will return the port number of this socket
        System.out.println("Local Port number: "+socket.getLocalPort());
        //getLocalSocketAddress() returns the address of the endpoint to which this socket is bound
        //the default address returns the loopback SocketAddress
        System.out.println("Local socket address: "+socket.getLocalSocketAddress());
    }
}

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Output:

Local Port number: 1085
Local socket address: /192.168.0.102:1085

Example 3

import java.io.IOException;
import java.net.*;
public class JavaSocketGetLocalSocketAddressExample3  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        //getLocalSocketAddress() returns the address of the endpoint to which this socket is bound
        //it will return null, as the socket is not bounded
        System.out.println("Local socket address: "+socket.getLocalSocketAddress());
    }
}

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Output: