我们的系统中有一个连接到第三方服务器的进程，在多线程环境中每隔几分钟发送数百万个HTTP get请求 .

之前我使用以下代码连接到工作正常的服务器：

public CloseableHttpClient buildCustomHttpClient() {
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
        cm.setMaxTotal(requesterThreads);
        cm.setDefaultMaxPerRoute(requesterThreads / 10);
        RequestConfig reqConfig = RequestConfig.custom().setSocketTimeout(SOCKET_TIMEOUT).setConnectTimeout(CONNECTION_TIMEOUT).setConnectionRequestTimeout(CONNECTION_REQUEST_TIMEOUT).build();
        CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(cm).setDefaultRequestConfig(reqConfig).build();
        return httpClient;
    }

但是，现在服务器根据Oauth对每个请求进行身份验证 . 因此，代码已更新为使用Google API和OAuth客户端，如下所示：

final Credential credential = new Credential(BearerToken.authorizationHeaderAccessMethod()).setAccessToken(accessToken);
            final HttpRequestFactory requestFactory = new NetHttpTransport().createRequestFactory(credential);
            httpResponse = requestFactory.buildGetRequest(new GenericUrl(requestUrl)).execute();

现在我开始在日志中经常看到以下异常：

java.net.ConnectException: Cannot assign requested address
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:579)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:996)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:932)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:850)
    at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:93)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:981)
    at com.ci.test.Requester$RequestProcessor.call(Requester.java:368)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

以下是我正在使用的google api版本：

<dependency>
    <groupId>com.google.api-client</groupId>
    <artifactId>google-api-client</artifactId>
    <version>1.22.0</version>
</dependency>
<dependency>
    <groupId>com.google.oauth-client</groupId>
    <artifactId>google-oauth-client</artifactId>
    <version>1.22.0</version>
</dependency>

任何人都可以解释代码有什么问题吗？这是在多线程环境中使用和高性能的最佳方法吗？

谢谢！

java httprequest google-oauth connectexception