How To Check Network Connection Using Java

It if often required to get the details of the network connection in your desktop. It will be useful if you could get the details of all the connected network details for the future operations. Java has set of classes in the java.net package which is useful for the Java network programming. In this example I have used NetworkInterface class to get the list of networks connected to the system. It doesn’t provide the network is internet or intranet, but you will be able to use the details to get an idea about the network connection.

Lets look at the example.

NetworkConnectionExample.java

package javabeat.net.core;

import java.io.IOException;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.UnknownHostException;
import java.util.Enumeration;

public class NetworkConnectionExample {
	public static void main(String[] args) throws UnknownHostException, IOException{
		Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
		while (interfaces.hasMoreElements()) {
		    NetworkInterface networkInterface = interfaces.nextElement();
		    System.out.println("Network Interface Name : [" + networkInterface.getDisplayName() + "]");
		    System.out.println("Is It connected? : [" + networkInterface.isUp() + "]");
		    for (InterfaceAddress i : networkInterface.getInterfaceAddresses()){
		    	System.out.println("Host Name : "+i.getAddress().getCanonicalHostName());
		    	System.out.println("Host Address : "+i.getAddress().getHostAddress());
		    }
		    System.out.println("----------------------");
		}
	}
}

Output…

Network Interface Name : [eth1]
Is It connected? : [true]
Host Name : fe80:0:0:0:2e0:4cff:fe00:2071%3
Host Address : fe80:0:0:0:2e0:4cff:fe00:2071%3
Host Name : krishna-desktop.local
Host Address : 192.168.0.101
----------------------
Network Interface Name : [lo]
Is It connected? : [true]
Host Name : ip6-localhost
Host Address : 0:0:0:0:0:0:0:1%1
Host Name : localhost
Host Address : 127.0.0.1
----------------------

Comments

comments

About Krishna Srinivasan

He is Founder and Chief Editor of JavaBeat. He has more than 8+ years of experience on developing Web applications. He writes about Spring, DOJO, JSF, Hibernate and many other emerging technologies in this blog.

Comments

  1. Gunjan Shah says:

    This is response I am getting from above sample in my system,

    Network Interface Name : [Software Loopback Interface 1]
    Is It connected? : [true]
    Host Name : 0:0:0:0:0:0:0:1
    Host Address : 0:0:0:0:0:0:0:1
    Host Name : 127.0.0.1
    Host Address : 127.0.0.1
    Network Interface Name : [WAN Miniport (SSTP)]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (L2TP)]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (PPTP)]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (PPPOE)]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (IPv6)]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (Network Monitor)]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (IP)]
    Is It connected? : [false]
    Network Interface Name : [RAS Async Adapter]
    Is It connected? : [false]
    Network Interface Name : [Intel(R) 82566DM-2 Gigabit Network Connection]
    Is It connected? : [true]
    Host Name : 01HW181104.eis.equifax.com
    Host Address : fe80:0:0:0:ede6:953f:4133:2edd%10
    Host Name : 01HW181104.eis.equifax.com
    Host Address : 172.24.134.26
    Network Interface Name : [Microsoft ISATAP Adapter]
    Is It connected? : [false]
    Host Name : fe80:0:0:0:0:5efe:ac18:861a%11
    Host Address : fe80:0:0:0:0:5efe:ac18:861a%11
    Network Interface Name : [WAN Miniport (IKEv2)]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (IPv6) – McAfee NDIS Intermediate Filter Miniport]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (Network Monitor) – McAfee NDIS Intermediate Filter Miniport]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (IP) – McAfee NDIS Intermediate Filter Miniport]
    Is It connected? : [false]
    Network Interface Name : [Intel(R) 82566DM-2 Gigabit Network Connection – McAfee NDIS Intermediate Filter Miniport]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (IP) – Juniper Network Agent Miniport]
    Is It connected? : [false]
    Network Interface Name : [Intel(R) 82566DM-2 Gigabit Network Connection – Juniper Network Agent Miniport]
    Is It connected? : [false]
    Network Interface Name : [Juniper Networks Virtual Adapter Manager]
    Is It connected? : [false]
    Network Interface Name : [Intel(R) 82566DM-2 Gigabit Network Connection – Juniper Network Agent Miniport-QoS Packet Scheduler-0000]
    Is It connected? : [false]
    Network Interface Name : [Intel(R) 82566DM-2 Gigabit Network Connection – Juniper Network Agent Miniport-WFP LightWeight Filter-0000]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (Network Monitor)-QoS Packet Scheduler-0000]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (IP) – Juniper Network Agent Miniport-QoS Packet Scheduler-0000]
    Is It connected? : [false]
    Network Interface Name : [WAN Miniport (IPv6)-QoS Packet Scheduler-0000]
    Is It connected? : [false]
    ———————-
    Network Test :true

    But, When I try to connect a web Service using Eclipse, it gives error “Connection Timeout”.

    Can you tell me, Why I am not able to connect to Internet using JAVA Code In Eclipse ?

    Thanks,
    Gunjan Shah.

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