Java - Socket getRemoteSocketAddress() Method

Description

The Java Socket getRemoteSocketAddress() returns the address of the endpoint this socket is connected to, or null if it is unconnected. If the socket was connected prior to being closed, then this method will continue to return the connected address after the socket is closed.

Declaration

Following is the declaration for java.net.Socket.getRemoteSocketAddress() method.

public SocketAddress getRemoteSocketAddress()

Parameters

NA

Return Value

a SocketAddress representing the remote endpoint of this socket, or null if it is not connected yet.

Exception

NA

Example 1

The following example shows the usage of Java Socket getRemoteSocketAddress() methd to get the socket address to which the socket is connected. As first step, we've created a Socket instance using no argument constructor. Then in order to create a SocketAddress object, we've initialized an InetAddress instance of localhost address. Using InetSocketAddress object, we've created a SocketAddress object and then using bind() method, we bind the address to the socket. Once done, we're printing the local port and local socket address using getRemoteSocketAddress() method as shown. In the end, we closed the socket using close() method.

package com.tutorialspoint;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;

public class SocketDemo {
   public static void main(String[] args) throws IOException {
      Socket socket = new Socket();  
      InetAddress inetAddress=InetAddress.getByName("localhost");  
      SocketAddress socketAddress=new InetSocketAddress(inetAddress, 6066);  
      socket.bind(socketAddress); 
      
      System.out.println("Port number: "+socket.getLocalPort()); 
      System.out.println("Remote Socket Address: "+socket.getRemoteSocketAddress()); 
      socket.close();
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Port number: 6066
Remote Socket Address: null

Example 2

The following example shows the usage of Java Socket getRemoteSocketAddress() methd to get the address where the socket is not connected. As first step, we've created a Socket instance using no argument constructor. Now using bind() method, we bind a null address to the socket. Once done, we're printing, local port being assigned to the socket as default and local socket address using getRemoteSocketAddress() method as shown. In the end, we closed the socket using close() method.

package com.tutorialspoint;

import java.io.IOException;
import java.net.Socket;

public class SocketDemo {
   public static void main(String[] args) throws IOException {
      Socket socket = new Socket();  
      socket.bind(null); 

      System.out.println("Port number: "+socket.getLocalPort()); 
      System.out.println("Remote Socket Address: "+socket.getRemoteSocketAddress()); 
      socket.close();
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Port number: 50375
Remote Socket Address: null

Example 3

The following example shows the usage of Java Socket getRemoteSocketAddress() methd to get the address where the socket is already closed. As first step, we've created a Socket instance using no argument constructor. Then in order to create a SocketAddress object, we've initialized an InetAddress instance of localhost address. Using InetSocketAddress object, we've created a SocketAddress object. Using socket.close(), we're closing the socket. Now we're printing local port being assigned to the socket as default and local socket address using getRemoteSocketAddress() method as shown. In the end, we closed the socket using close() method.

package com.tutorialspoint;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;

public class SocketDemo {
   public static void main(String[] args) throws IOException {
      Socket socket = new Socket();  
      InetAddress inetAddress=InetAddress.getByName("localhost");  
      SocketAddress socketAddress=new InetSocketAddress(inetAddress, 6066);  
      socket.bind(socketAddress); 
      socket.close();
      
      System.out.println("Port number: "+socket.getLocalPort()); 
      System.out.println("Remote Socket Address: "+socket.getRemoteSocketAddress()); 
      socket.close();
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Port number: 6066
Remote Socket Address: null