Java Socket getRemoteSocketAddress() method

The getRemoteSocketAddress () method of Java Socket class returns the address of the endpoint of the specified socket if it is connected else it will return null if this socket is not connected.

Syntax

Parameter

Return

The getRemoteSocketAddress () method either returns the SocketAddress indicating the remote endpoint of the socket if the socket is connected else it returns null if the socket is not connected.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketGetRemoteSocketAddressExample1  {
    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());
        //getRemoteSocketAddress() returns returns the address of the endpoint of the specified socket if it is connected
        System.out.println("Remote socket address: "+socket.getRemoteSocketAddress());
    }
}

Test it Now

Output:

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

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketGetRemoteSocketAddressExample2  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        //getRemoteSocketAddress() returns returns the address of the endpoint of the specified socket
        //it returns null, if it is not connected
        System.out.println("Remote socket address: "+socket.getRemoteSocketAddress());
    }
}

Test it Now

Output:

Remote socket address: null

Example 3

import java.io.IOException;
import java.net.*;
public class JavaSocketGetRemoteSocketAddressExample3  {
    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);
        //the connection will not establish without binding the socket with bind() method
        socket.connect(socketAddress);
        //getPort() method will return the port number of this socket
        System.out.println("Local Port number: "+socket.getLocalPort());
        //getRemoteSocketAddress() returns the address of the endpoint of the specified socket if the socket is connected
        System.out.println("Remote socket address: "+socket.getRemoteSocketAddress());
    }
}

Test it Now

Output:

Exception in thread "main" java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.connect0(Native Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at java.net.Socket.connect(Socket.java:538)
	at com.javaTpoint. JavaSocketGetRemoteSocketAddressExample3.main(
	JavaSocketGetRemoteSocketAddressExample3.java:15)

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