Java HTTP 客户端输出空 JSON

Question

我正在运行以下代码:

CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet("http://10.0.0.22:8086/db/cadvisorDB/series?u=root&p=root&q=select%20max(memory_usage)%20from%20stats%20where%20container_name%20%3D%27execution_container_"+bench_list+"_"+i+"%27%20and%20memory_usage%20%3C%3E%200%20group%20by%20container_name");
//Thread.sleep(10000);
CloseableHttpResponse requestResponse = httpclient.execute(httpGet);
String response=EntityUtils.toString(requestResponse.getEntity());
System.out.println(response);

输出控制台:

[]

当我等待 HttpResponse 30 秒时，它起作用了。我得到了完整的响应(带有数据点的 JSON):

Thread.sleep(30000);

是否可以使用 Apache Java 客户端告诉客户端等待，直到获得不同于“[]”的值。我的意思是一个非空的 Json。

使用超时并不能解决问题。

提前谢谢你

Answer 1

然后设置超时就可以了。

HttpGet request = new HttpGet(url);

    // set timeouts as you like
    RequestConfig config = RequestConfig.custom()
            .setSocketTimeout(60 * 1000).setConnectTimeout(20 * 1000)
            .setConnectionRequestTimeout(20 * 1000).build();

    request.setConfig(config);