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qiniu-suits is a efficient tools for qiniu api implemented by java8.

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package com.qiniu.util;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.List;

import static okhttp3.Dns.SYSTEM;

public class RequestUtils {

    public static String checkHost(String domain) throws UnknownHostException {
        if (domain == null || "".equals(domain)) throw new UnknownHostException("the hostname is empty.");
        List inetAddresses = SYSTEM.lookup(domain);
        return inetAddresses.get(0).getHostAddress();
    }
}