Java - Socket getLocalSocketAddress() Method

Description

The Java Socket getLocalSocketAddress() returns the address of the endpoint this socket is bound to.

Declaration

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

public SocketAddress getLocalSocketAddress()

Parameters

NA

Return Value

a SocketAddress representing the local endpoint of this socket, or a SocketAddress representing the loopback address if denied by the security manager, or null if the socket is not bound yet.

Exception

NA

Example 1

The following example shows the usage of Java Socket getLocalSocketAddress() 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 getLocalSocketAddress() 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("Local Socket Address: "+socket.getLocalSocketAddress()); 
      socket.close();
   }
}

Output

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

Port number: 6066
Local Socket Address: /127.0.0.1:6066

Example 2

The following example shows the usage of Java Socket getLocalSocketAddress() 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 getLocalSocketAddress() 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("Local Socket Address: "+socket.getLocalSocketAddress()); 
      socket.close();
   }
}

Output

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

Port number: 57729
Local Socket Address: 0.0.0.0/0.0.0.0:57729

Example 3

The following example shows the usage of Java Socket getLocalSocketAddress() 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 getLocalSocketAddress() 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("Local Socket Address: "+socket.getLocalSocketAddress()); 
      socket.close();
   }
}

Output

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

Port number: 6066
Local Socket Address: 0.0.0.0/0.0.0.0:6066