import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.JSONObject;

import org.apache.http.*;

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.ContentType;

import org.apache.http.entity.StringEntity;

import org.apache.http.entity.mime.MultipartEntityBuilder;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.message.BasicHeader;

import org.apache.http.protocol.HTTP;

import org.apache.http.util.EntityUtils;

import org.apache.logging.log4j.LogManager;

import org.apache.logging.log4j.Logger;

import java.io.*;

import java.net.HttpURLConnection;

import java.net.URL;

import java.nio.charset.Charset;

import java.nio.charset.StandardCharsets;

import java.util.Map;

public class HttpUtil {

    private final static Logger logger = LogManager.getLogger(HttpUtil.class);

    public static String sendPost(String url, String param) {

        String result = "";

        try {

            URL httpurl = new URL(url);

            HttpURLConnection httpConn = (HttpURLConnection) httpurl.openConnection();

            httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

            httpConn.setDoOutput(true);

            httpConn.setDoInput(true);

            PrintWriter out = new PrintWriter(new OutputStreamWriter(httpConn.getOutputStream(), StandardCharsets.UTF_8));

            out.print(param);

            out.flush();

            out.close();

            BufferedReader in = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), StandardCharsets.UTF_8));

            String line;

            while ((line = in.readLine()) != null) {

                result += line;

            }

            in.close();

        } catch (Exception e) {

            System.out.println(e);

            logger.error(e);

        }

        return result;

    }

}