package asi;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;public class TestHttpClient {     public static void main(String[] args){  RequestConfig requestConfig = RequestConfig.custom()               .setSocketTimeout(150000)               .setConnectTimeout(150000)               .setConnectionRequestTimeout(150000)               .build();       CloseableHttpClient httpClient =  HttpClients.createDefault();     CloseableHttpResponse response = null;       HttpEntity httpEntity = null;       String responseContent = null;        String url=...  String json=...  HttpPost httpPost=new HttpPost(url);       httpPost.addHeader("Content-type","application/json; charset=utf-8");    httpPost.setHeader("Accept", "application/json");     try {           StringEntity stringEntity = new StringEntity(json, "UTF-8");           stringEntity.setContentType("application/x-www-form-urlencoded");           httpPost.setEntity(stringEntity);           httpPost.setConfig(requestConfig);                  response = httpClient.execute(httpPost);           httpEntity = response.getEntity();           responseContent = EntityUtils.toString(httpEntity, "UTF-8");     } catch (Exception e) {           e.printStackTrace();       }       System.out.println(responseContent); } }