Monday

Networking in Java

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Java is a premier language for network programming. java.net package encapsulate large number of classes and interface that provides an easy-to use means to access network resources. Here are some important classes and interfaces of java.net package.

Some Important Classes
CLASSES
CacheRequest
CookieHandler
CookieManager
Datagrampacket
Inet Address
ServerSocket
Socket
DatagramSocket
Proxy
URL
URLConnection

Some Important Interfaces
INTERFACES
CookiePolicy
CookieStore
FileNameMap
SocketOption
InetAddress
ServerSocket
SocketImplFactory
ProtocolFamily

InetAddress
Inet Address encapsulates both numerical IP address and the domain name for that address. Inet address can handle both IPv4 and Ipv6 addresses. Inet Address class has no visible constructor. To create an inet Address object, you have to use Factory methods.
Three commonly used Inet Address factory methods are.
  1. static InetAddress getLocalHost() throws UnknownHostException
  2. static InetAddress getByName (String hostname) throws UnknownHostException
  3. static InetAddress[ ] getAllByName (String hostname) throws UnknownHostException


Example using InetAddress class
import java.net.*;
class Test
{
 public static void main(String[] args)
 {
  InetAddress address = InetAddress.getLocalHost();
  System.out.println(address);
  address = InetAddress.getByName("www.vigyancode.blogspot.com");
  System.out.println(address);
  InetAddress sw[] = InetAddress.getAllByName("www.vigyancode.blogspot.com");
  for(int i=0; i< sw.length; i++)
  {
   System.out.println(sw[i]);
  }
 }
}
Output:
Welcome-PC/59.161.87.227
www.netparam.com/74.125.236.115
www.netparam.com/74.125.236.116
www.netparam.com/74.125.236.112
www.netparam.com/74.125.236.113
www.netparam.com/74.125.236.114
www.netparam.com/2404:6800:4009:802:0:0:0:1014



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