How to check internet connection using java

• Hi friends now we are going to check our pc is having internet connection or not using java code 
• yes we can check internet connection using java code java.net package providing some useful classes.
• Using java.net.URL and java.net.URLConnection classes we need to check we can check we have a connection or not.
• Lets see the program to detect internet connection using java

#1:

1. package InternetConnections;
2. import java.net.URL;
3. import java.net.URLConnection; 
4. 
   
5. public class CheckInternetConnection{
6.  
7. public static void main(String[] args){
8.   
9. try 
10. {
11.         URL url = new URL("http://www.instanceofjava.com");
12.  
13.         URLConnection connection = url.openConnection();
14.         connection.connect();   
15.  
16.         System.out.println("Internet Connected");   
17.             
18.  }catch (Exception e){
19.      
20. System.out.println("Sorry, No Internet Connection");     
21.                                                             
22. } 
23. 
    
24. }
25. }

#2:

• By using  getRuntime() method of java.lang.Runtime  we can also test internet connection in java
• The output will be 0 if internet connection available 1 if not.

#3:

1. package InternetConnections;
2.  
3. import java.net.NetworkInterface;
4. import java.net.SocketException;
5. import java.util.Enumeration;
6. 
   
7. public class CheckInternetConnection{
8.  
9. public static void main(String[] args){
10.  
11. Enumeration<NetworkInterface> interfaces = null;
12.  
13. try {
14.            
15.      interfaces = NetworkInterface.getNetworkInterfaces();
16.  
17.   } catch (SocketException e) {
18.             e.printStackTrace();
19.  }  
20.  
21.  while (interfaces.hasMoreElements()) {  
22.  
23.       NetworkInterface nic = interfaces.nextElement();   
24.       System.out.print("Interface Name : [" + nic.getDisplayName() + "]");  
25.      
26. try {
27.       
28.  System.out.println(", is connected : [" + nic.isUp() + "]"); 
29. 
    
30. } catch (SocketException e) {
31.                 e.printStackTrace();
32. }  
33.  
34. }   
35. 
    
36. }
37. }

Output:

1. Interface Name : [Software Loopback Interface 1], is connected : [true]
2. Interface Name : [WAN Miniport (SSTP)], is connected : [false]
3. Interface Name : [WAN Miniport (L2TP)], is connected : [false]
4. Interface Name : [WAN Miniport (PPTP)], is connected : [false]
5. Interface Name : [WAN Miniport (PPPOE)], is connected : [false]
6. Interface Name : [WAN Miniport (IPv6)], is connected : [false]
7. Interface Name : [WAN Miniport (Network Monitor)], is connected : [false]
8. Interface Name : [WAN Miniport (IP)], is connected : [false]
9. Interface Name : [RAS Async Adapter], is connected : [false]
10. Interface Name : [WAN Miniport (IKEv2)], is connected : [false]
11. Interface Name : [Realtek PCIe GBE Family Controller], is connected : [true]
12. Interface Name : [Atheros AR9485WB-EG Wireless Network Adapter], is connected : [false]
13. Interface Name : [Teredo Tunneling Pseudo-Interface], is connected : [false]
14. Interface Name : [Microsoft Virtual WiFi Miniport Adapter], is connected : [true]
15. Interface Name : [null], is connected : [false]
16. Interface Name : [Microsoft Virtual WiFi Miniport Adapter #2], is connected : [false]
17. Interface Name : [null], is connected : [false]
18. Interface Name : [Teredo Tunneling Pseudo-Interface], is connected : [false]
19. Interface Name : [Apple Mobile Device Ethernet], is connected : [false]
20. Interface Name : [Microsoft 6to4 Adapter], is connected : [true]
21. Interface Name : [Microsoft ISATAP Adapter #4], is connected : [false]
22. Interface Name : [Microsoft ISATAP Adapter], is connected : [false]
23. Interface Name : [Atheros AR9485WB-EG Wireless Network Adapter-Connectify WLAN
24. LightWeight Filter-0000], is connected : [false]
25. Interface Name : [Atheros AR9485WB-EG Wireless Network Adapter-Connectify NDIS
26. LightWeight Filter-0000], is connected : [false]
27. Interface Name : [Atheros AR9485WB-EG Wireless Network Adapter-QoS Packet
28. Scheduler0000], is connected : [false]
29. Interface Name : [Atheros AR9485WB-EG Wireless Network Adapter-Virtual WiFi Filter
30. Driver-0000], is connected : [false]
31. Interface Name : [Realtek PCIe GBE Family Controller-Connectify NDIS LightWeight Filter
32. 0000], is connected : [false]
33. Interface Name : [Realtek PCIe GBE Family Controller-QoS Packet Scheduler-0000], is
34. connected : [false]
35. Interface Name : [Realtek PCIe GBE Family Controller-WFP LightWeight Filter-0000], is
36. connected : [false]
37. Interface Name : [Realtek PCIe GBE Family Controller-Deterministic Network Enhancer
38. 0000], is connected : [false]
39. Interface Name : [WAN Miniport (IPv6)-Connectify NDIS LightWeight Filter-0000], is
40. connected : [false]
41. Interface Name : [WAN Miniport (IPv6)-Deterministic Network Enhancer-0000], is connected
42. : [false]
43. Interface Name : [WAN Miniport (IPv6)-QoS Packet Scheduler-0000], is connected : [false]
44. Interface Name : [WAN Miniport (IP)-Connectify NDIS LightWeight Filter-0000], is
45. connected : [false]
46. Interface Name : [WAN Miniport (IP)-Deterministic Network Enhancer-0000], is connected :
47. [false]
48. Interface Name : [WAN Miniport (IP)-QoS Packet Scheduler-0000], is connected : [false]
49. Interface Name : [WAN Miniport (Network Monitor)-Connectify NDIS LightWeight Filter
50. 0000], is connected : [false]
51. Interface Name : [WAN Miniport (Network Monitor)-QoS Packet Scheduler-0000], is
52. connected : [false]
53. Interface Name : [Atheros AR9485WB-EG Wireless Network Adapter-Native WiFi Filter
54. Driver-0000], is connected : [false]
55. Interface Name : [Atheros AR9485WB-EG Wireless Network Adapter-Deterministic Network
56. Enhancer-0000], is connected : [false]
57. Interface Name : [Atheros AR9485WB-EG Wireless Network Adapter-WFP LightWeight
58. Filter-0000], is connected : [false]
59. Interface Name : [Microsoft Virtual WiFi Miniport Adapter-Native WiFi Filter Driver-0000], is
60. connected : [false]
61. Interface Name : [Microsoft Virtual WiFi Miniport Adapter-Deterministic Network Enhancer
62. 0000], is connected : [false]
63. Interface Name : [Microsoft Virtual WiFi Miniport Adapter-Connectify NDIS LightWeight
64. Filter-0000], is connected : [false]
65. Interface Name : [Microsoft Virtual WiFi Miniport Adapter-QoS Packet Scheduler-0000], is
66. connected : [false]
67. Interface Name : [Microsoft Virtual WiFi Miniport Adapter-WFP LightWeight Filter-0000], is
68. connected : [false]
69. Interface Name : [Microsoft Virtual WiFi Miniport Adapter-Connectify WLAN LightWeight
70. Filter-0000], is connected : [false]