Java调用接口连接超时

问题遇到的现象和发生背景

Java在调用接口，当请求过于频繁时，有的请求会响应超时，有的请求正常。

问题相关代码，请勿粘贴截图

package guide.iface.oa.webservice;

import org.apache.commons.lang3.StringEscapeUtils;
import org.apache.http.HttpEntity;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.rmi.RemoteException;
import java.util.*;

/**

```
    2022/4/22 新建
```

/
public class OaWebService {

public static void main(String[] args) throws RemoteException {

  String jsonText = "{'aaa':'1111','bbb':'22222'}";
  getOfficeAuto(jsonText);

}

/**

默认参数设置 setConnectTimeout：设置连接超时时间，单位毫秒。
setConnectionRequestTimeout：设置从connect Manager获取Connection 超时时间，单位毫秒。
setSocketTimeout：请求获取数据的超时时间，单位毫秒。访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。暂时定义15分钟
/
private static RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(600000)
```
  .setConnectTimeout(600000).setConnectionRequestTimeout(600000).build();
```

public synchronized static LinkedHashMap<String, String> getOfficeAuto(String jsonText) throws RemoteException {

  String url = "xxxxxxxx";
  String xml = jsonToXml(jsonText);
  return sendHttpPost(url, xml);

}

/**

@Description json 字符串转 xml报文
@Param [jsonText]
@Return java.lang.String
@Date 2022/5/5 9:09

/
public static String jsonToXml(String jsonText) {
String xml = "";
xml = "<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope//%22 xmlns:web="webservices.ofs.weaver.com.cn">\n"

      + "   <soapenv:Header/>\n" + "   <soapenv:Body>\n" + "      <web:receiveRequestInfoByJson>\n"
      + "         <web:in0>" + jsonText + "</web:in0>\n" + "      </web:receiveRequestInfoByJson>\n"
      + "   </soapenv:Body>\n" + "</soapenv:Envelope>";

return xml;
}

/**

发送 post请求
@param httpUrl 地址
@param params 参数(格式:key1=value1&key2=value2)
/
public synchronized static LinkedHashMap<String, String> sendHttpPost(String httpUrl, String params) {
HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost
try {
```
  // 设置参数
  StringEntity stringEntity = new StringEntity(params, "UTF-8");
  stringEntity.setContentType("application/json");
  httpPost.setEntity(stringEntity);
```
} catch (Exception e) {
```
  e.printStackTrace();
```
}
return sendHttpPost(httpPost);
}

/**

发送Post请求
@param httpPost
@return

/
private synchronized static LinkedHashMap<String, String> sendHttpPost(HttpPost httpPost) {
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
HttpEntity entity = null;
LinkedHashMap<String, String> map = new LinkedHashMap<String, String>();
String responseContent = null;
try {

  // 创建默认的httpClient实例
  httpClient = HttpClients.createDefault();
  httpPost.setConfig(requestConfig);
  // 执行请求
  response = httpClient.execute(httpPost);
  entity = response.getEntity();
  responseContent = EntityUtils.toString(entity, "UTF-8");// 返回json格式
  map.put("status", response.getStatusLine().getStatusCode() + "");
  map.put("message", StringEscapeUtils.unescapeHtml3(responseContent));

} catch (Exception e) {

  map.put("status", "599");
  if (e.toString().length() > 200) {
      map.put("message", e.toString().substring(0, 200));
  } else {
      map.put("message", e.toString());
  }
  e.printStackTrace();

} finally {

  try {
      // 关闭连接,释放资源
      if (response != null) {
          response.close();
      }
      if (httpClient != null) {
          httpClient.close();
      }
  } catch (IOException e) {
      e.printStackTrace();
  }

}
return map;
}

}

运行结果及报错内容

java.net.UnknownHostException: urlxx
接口响应有时正常，有时连接超时。超时情况大约在集中请求的时候。

我的解答思路和尝试过的方法

使用ping 未看出有丢包的情况
尝试使用同步和睡眠方法还是不行

我想要达到的结果

响应无连接超时，数据请求返回正常

可能别人有限制，你请求频率太高，直接给你返回错误，这种你没办法让别人必须返回正确。
返回异常自己捕获，自己处理