Java IP Address Get getIPAddress(final String hostName)

Description

Retrieves a host's IP address; see SOAPClient.getLocalAddr() for local IP

License

Open Source License

Parameter

Parameter	Description
hostName	the host's name

Return

the host's IP address

Declaration

public final static String getIPAddress(final String hostName) 

Method Source Code

//package com.java2s;
/**//from   ww w.j a v a  2s.c  o  m
 * The contents of this file are subject to the Regenstrief Public License
 * Version 1.0 (the "License"); you may not use this file except in compliance with the License.
 * Please contact Regenstrief Institute if you would like to obtain a copy of the license.
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) Regenstrief Institute.  All Rights Reserved.
 */

import java.net.*;

public class Main {
    /**
     * Retrieves a host's IP address; see SOAPClient.getLocalAddr() for local IP
     * 
     * @param hostName the host's name
     * @return the host's IP address
     **/
    public final static String getIPAddress(final String hostName) {
        try {
            //return new Socket(hostName, port).getInetAddress().getHostAddress();
            // See PropertyContext for dealing with ipv6 addresses
            return InetAddress.getByName(hostName).getHostAddress();
        } catch (final Exception e) {
            throw toRuntimeException(e);
        }
    }

    /**
     * Creates a RuntimeException from the Throwable if it isn't already a RuntimeException
     * 
     * @param e the Throwable
     * @return the RuntimeException
     **/
    public final static RuntimeException toRuntimeException(final Throwable e) {
        if (e == null) {
            // Without this check, toRuntimeException(e.getCause()) creates a confusing RuntimeException if cause is null
            return new NullPointerException("Problem without an Exception");
        }
        return e instanceof RuntimeException ? (RuntimeException) e : new RuntimeException(e);
    }
}

Related

1. getIpAddress()
2. getIPAddress()
3. getIpAddress()
4. getIPAddress()
5. getIPAddress(boolean useIPv4)
6. getIPAddress(NetworkInterface e)
7. getIPAddress(String hostname)
8. getIpAddress(String server)
9. getIpAddresses()