Java应用技巧：如何用Java获得IP地址

import java.net.InetAddress;

import java.net.UnknownHostException;

ublic class NsLookup 
{

tatic public void main(String[] args)
{

try {

InetAddress address = 
InetAddress.getByName(args[0]);

System.out.println(args[0]+"

: "+address.getHostAddress());

}

catch(UnknownHostException uhe) 
{

System.err.println
("Unable to find: "+args[0]);

}

}

}

ash$ java code.NsLookup www.sun.com

www.sun.com: 192.18.97.241

import java.net.InetAddress;

import java.net.UnknownHostException;

ublic class NsLookup {

tatic public void main(String[] args) 
{

try {

String name = args[0];

InetAddress[] addresses =
InetAddress.getAllByName(name);

for(int i=0; i<addresses.length; i++) 
{

System.out.println(name+"["+i+"]

: "+address.getHostAddress());

}

} catch(UnknownHostException uhe) 
{

System.err.println("Unable to find:
"+args[0]);

}

}

}

ash$ java code.NsLookup www.sun.com

www.sun.com[0]: 192.18.97.241

ash$ javad code/NsLookup.java

www.microsoft.com

www.microsoft.com[0]: 207.46.230.218

www.microsoft.com[1]: 207.46.197.101

www.microsoft.com[2]: 207.46.230.229

www.microsoft.com[3]: 207.46.197.113

www.microsoft.com[4]: 207.46.230.219

www.microsoft.com[5]: 207.46.230.220

[6">www.microsoft.com[6]: 207.46.197.102

ash$ java code.NsLookup www.sun.com

localhost: 127.0.0.1

try {

InetAddress localhost = 
InetAddress.getLocalHost();

System.out.println

("localhost: "+localhost.getHostAddress());

System.out.println

("localhost: "+localhost.getHostName());

} catch(UnknownHostException uhe) 
{

System.err.println

("Localhost not seeable. 
Something is odd. ");

}

localhost: 192.168.13.15

localhost: crab