OKHTTP3设置Timeout参数无效

OKHTTP3设置Timeout参数无效

在使用okhttp3发送请求,用IP直接访问时,设置的超时时间是正常的.改成访问某个域名时,设置的超时时间是10s,但是实际测试是40s左右,程序才打印出错误信息.
解决方法:
自己实现一个okhttp3.Dns的类,处理域名解析超时问题.

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

import okhttp3.Dns;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class GetAccuTime {
    public void getContent(Callback callback) {
        new Thread(() -> {
            try {
                OkHttpClient client = new OkHttpClient.Builder()
                        .connectTimeout(10 , TimeUnit.SECONDS)
                        .writeTimeout(10 ,TimeUnit.SECONDS)
                        .readTimeout(10 ,TimeUnit.SECONDS)
                        .dns(new XDns(10,TimeUnit.SECONDS))
                        .build();
                Request request = new Request.Builder()
                        .url("https://www.pengwf.com/")
                        .build();
                Response response = client.newCall(request).execute();
                String res = response.body().string();
                callback.onResponse(res);
            } catch (Exception e) {
                callback.onError(e);
            }
        }).start();
    }

    public interface Callback{
        void onResponse(String content);
        void onError(Exception e);
    }

    public class XDns implements Dns {
        private long timeout;
        private TimeUnit unit;

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

        @Override
        public List<InetAddress> lookup(final String hostname) throws UnknownHostException {
            if (hostname == null) {
                throw new UnknownHostException("hostname == null");
            } else {
                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();
                    return task.get(timeout, unit);
                } catch (Exception var4) {
                    UnknownHostException unknownHostException =
                            new UnknownHostException("Broken system behaviour for dns lookup of " + hostname);
                    unknownHostException.initCause(var4);
                    throw unknownHostException;
                }
            }
        }
    }
}