Java Host Address Get getHostName(String addr)

Description

get Host Name

License

Open Source License

Declaration

public static String getHostName(String addr) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.net.InetAddress;
import java.net.UnknownHostException;

public class Main {
    public static String getHostName(String addr) {
        if (!isRawAddress(addr))
            return addr;
        try {/*  w  ww. j a  v  a2  s.com*/
            return InetAddress.getByAddress(toRawAddress(addr)).getHostName();
        } catch (UnknownHostException e) {
            return addr;
        }
    }

    public static boolean isRawAddress(String addr) {
        return addr.matches("(\\d+).(\\d+).(\\d+).(\\d+)");
    }

    public static byte[] toRawAddress(String addr) {
        byte[] address = new byte[4];
        String[] s = addr.split("\\.");
        for (int i = 0; i < 4; i++) {
            address[i] = (byte) Integer.parseInt(s[i]);
        }
        return address;
    }
}

Related

1. getHostAddresses()
2. getHostAddresses()
3. getHostAddresses()
4. getHostAddressFromProperty(final String property)
5. getHostExternalAddr()
6. getHostName(String address)
7. getHostName(String address)
8. getHostName(String localAddress)
9. getHostnameOrAddress()