httpclient发送请求的几种方式

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);
 }

}