xiaoshi-weixinback/src/main/java/com/example/xiaoshiweixinback/business/config/XDns.java

package com.example.xiaoshiweixinback.business.config;

import okhttp3.Dns;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;

public class XDns implements Dns {
    private long timeout;

    public XDns(long timeout) {
        this.timeout = timeout;
    }

    @Override
    public List<InetAddress> lookup(final String hostname) throws UnknownHostException {
        if (hostname == null) {
            throw new UnknownHostException("hostname == null");
        } else {
            List<InetAddress> inetAddresses =new ArrayList<>();
            Boolean falg =true;
            while (falg){
                try {
                    FutureTask<List<InetAddress>>  task = new FutureTask<>(
                            new Callable<List<InetAddress>>() {
                                @Override
                                public List<InetAddress> call() throws Exception {
                                    return Arrays.asList(InetAddress.getAllByName(hostname));
                                }
                            });
                    new Thread(task).start();
                    inetAddresses=task.get(timeout, TimeUnit.MILLISECONDS);
                    falg =false;
                } catch (Exception var4) {
                  continue;
                }
            }
                return inetAddresses;
        }
    }
}