关于引用第三方接口发送数据的问题

        今天上班搞了一个第三方接口测试的问题，因为之前没做过没有使用过HttpClient这个包，所以搞了好久

    这边是要传递6个参数，使用md5加密，并附带时间戳,接受的是一个json类型

        首先要引入依赖

 <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.2</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient-cache</artifactId>
            <version>4.5</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>4.3.2</version>
        </dependency>

package com.Test;

import java.io.*;
import java.math.BigInteger;
import java.net.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;

import lombok.extern.slf4j.Slf4j;
import net.sf.json.JSONObject;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;


@Slf4j
public class appaddTest {
    public static final String ADD_URL = "url";
    public static final String cmd = "cmd";
    public static final String appid = "appid";
    public static final String appkey= "appkey";
    public static final String param = "";
    public static final String comkeyid = "comkeyid";
    public static final String comkey = "comkey";
    public static final String com = "com";
    public static final String part = "";

    public static void main(String[] args) {
//           String result =  sendGet(ADD_URL,param);
//           System.out.println(result);
//        appadd();
      String result =  sendPost();
        System.out.println(result);
    }
    public static void appadd() {
        try {
            URL url = new URL(ADD_URL);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestMethod("POST");
            connection.setUseCaches(false);
            connection.setInstanceFollowRedirects(true);
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "text/plain; charset=utf-8");
            connection.connect();
            PrintWriter out = new PrintWriter(connection.getOutputStream());
            JSONObject obj = new JSONObject();
            //设置cmd
            obj.element("cmd",cmd );
            //设置appid
            obj.element("appid", appid);
            //设置param
            obj.element("param",param);
            //upr设置
            com.alibaba.fastjson.JSONObject json = new com.alibaba.fastjson.JSONObject();
            json.put("comkeyid",comkeyid);
            json.put("com",com);
            json.put("part",part);
            String  stamp =  (new Date().getTime()+"").substring(0,10);
            String md = stamp +comkey+com+part;
            String  md2Md5 = md5digest(md);
            System.out.println("加密前"+md);
            System.out.println("加密后"+md2Md5);
            json.put("md",md2Md5);
            obj.element("upr", json.toJSONString());

            //设置时间戳
            obj.element("stamp", stamp);

            //设置md
            String MD = param + stamp+ json.toJSONString()+cmd+appkey;
            System.out.println("加密前"+MD);
            String MD2Md5 = md5digest(MD);
            System.out.println("加密后"+MD2Md5);
            obj.element("md",MD2Md5);
            out.print(obj.toString());
           log.info(obj.toString());
            out.flush();
            out.close();

            System.out.println(" connection.getInputStream():"+ connection.getInputStream());
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String lines;
            StringBuffer sb = new StringBuffer("");
            while ((lines = reader.readLine()) != null) {
                lines = new String(lines.getBytes(), "utf-8");
                sb.append(lines);
            }
            log.info(String.valueOf(sb));
            reader.close();
            connection.disconnect();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    private static String md5digest(String str){
        String  md5Str = null;
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
            md5.update(str.getBytes());
            md5Str = new BigInteger(1, md5.digest()).toString(16);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return md5Str;
    }

    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "text/plain; charset=utf-8");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
   public static String getParam(){
          String  upr =null;
        String  paramUrl =null;
        com.alibaba.fastjson.JSONObject json = new com.alibaba.fastjson.JSONObject();
          json.put("part",part);
          json.put("comkeyid",comkeyid);
          json.put("com",com);
         String  stamp =  (new Date().getTime()+"").substring(0,10);
         String md = stamp +comkey+com+part;
         String  md2Md5 = md5digest(md);
         json.put("md",md2Md5);
        System.out.println("加密前"+md);
        System.out.println("加密后"+md2Md5);
        try {
           upr  =  URLEncoder.encode(json.toString(),"UTF-8");
            paramUrl= URLEncoder.encode(param,"UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String MD = param + stamp+ json.toJSONString()+cmd+appkey;
        System.out.println("加密前"+MD);
        String MD2Md5 = md5digest(MD);
        System.out.println("加密后"+MD2Md5);
        String param = "cmd="+cmd+"&appid="+appid+"&param="+paramUrl+"&upr="+upr+"&stamp="+stamp+"&md="+MD2Md5;
        System.out.println(ADD_URL+"?"+param);

      return  param;
   }
   public static String sendPost(){
       CloseableHttpClient httpClient = HttpClients.createDefault();
       HttpPost httpPost = new HttpPost(ADD_URL);
       CloseableHttpResponse response = null;
       String resultString = "";

       //得到upr
       com.alibaba.fastjson.JSONObject json = new com.alibaba.fastjson.JSONObject();
       json.put("comkeyid",comkeyid);
       json.put("com",com);
       json.put("part",part);
       String  stamp =  (new Date().getTime()+"").substring(0,10);
       String md = stamp +comkey+com+part;
       String  md2Md5 = md5digest(md);
       System.out.println("加密前"+md);
       System.out.println("加密后"+md2Md5);
       json.put("md",md2Md5);

       //得到md
       String MD = param + stamp+ json.toJSONString()+cmd+appkey;
       System.out.println("加密前"+MD);
       String MD2Md5 = md5digest(MD);
       System.out.println("加密后"+MD2Md5);

       List<NameValuePair> paramList = new ArrayList<>();
       paramList.add(new BasicNameValuePair("cmd",cmd ));
       paramList.add(new BasicNameValuePair("appid", appid));
       paramList.add(new BasicNameValuePair("param",param));
       paramList.add(new BasicNameValuePair("upr", json.toJSONString()));
       paramList.add(new BasicNameValuePair("stamp", stamp ));
       paramList.add(new BasicNameValuePair("md",MD2Md5));
       try {
           UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);
           httpPost.setEntity(entity);
           response = httpClient.execute(httpPost);
           resultString = EntityUtils.toString(response.getEntity(), "utf-8");
       } catch (UnsupportedEncodingException e) {
           e.printStackTrace();
       }catch (IOException e){
           e.printStackTrace();
       } finally {
           try {
               response.close();
           } catch (IOException e) {

               e.printStackTrace();
           }
          return resultString;


   }
}
}