import com.mashape.unirest.http.*;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.security.MessageDigest;
import java.util.Calendar;
import java.net.URLEncoder;

public class main {
    // 获取字符串的md5值
    public static String getMD5Str(String str) {
        byte[] digest = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(str.getBytes(StandardCharsets.UTF_8));
            digest = md.digest();

            StringBuilder sb = new StringBuilder();
            for (byte b : digest) {
                String s = String.format("%02x", b);
                sb.append(s);
            }
            return sb.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

    public static void main(String[] args) throws Exception {
        String baseUrl = "https://api.qixin.com/APIService/creditgrade/getTaxpayerListByName";
        String appkey = "正式appkey";
        String secretKey = "正式secret_key";
        Calendar calendar = Calendar.getInstance();
        Long timestamp = calendar.getTime().getTime();
        String sign = getMD5Str(appkey + timestamp + secretKey);

        // 设置url参数
        Map<String, String> urlParams = new HashMap<String, String>();
        urlParams.put("keyword", "keyword的值");

        List<String> concatParams = new ArrayList<String>();
        for (String s : urlParams.keySet()) {
            concatParams.add(s + "=" + URLEncoder.encode(urlParams.get(s), StandardCharsets.UTF_8));
        }

        Unirest.setTimeouts(0, 2000);
        try {
            // 发送get请求，得到响应
            HttpResponse<String> response = Unirest.get(baseUrl + "?" + String.join("&", concatParams))
                    .header("Auth-version", "2.0")
                    .header("appkey", appkey)
                    .header("timestamp", timestamp + "")
                    .header("sign", sign)
                    .header("Content-Type", "application/json")
                    .asString();

            System.out.println(response.getBody());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

using System;
using System.Net.Http;
using System.Collections.Generic;
using System.Text;
using System.Text.Encodings.Web;
using System.Security.Cryptography;

namespace csharp
{
    class Program
    {
        public static string GetMD5Str(string str)
        {
            MD5 md5 = MD5.Create();
            byte[] buffer = Encoding.Default.GetBytes(str);
            byte[] MD5Buffer = md5.ComputeHash(buffer);

            //将字节数组转换成字符串
            string strResult = "";
            for (int i = 0; i < MD5Buffer.Length; i++)
            {
                strResult += MD5Buffer[i].ToString("x2");
            }

            return strResult;
        }

        static void Main(string[] args)
        {
            var baseUrl = "https://api.qixin.com/APIService/creditgrade/getTaxpayerListByName";
            var appkey = "正式appkey";
            var secretKey = "正式secret_key";
            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            var timeStamp = Convert.ToInt64(ts.TotalMilliseconds).ToString();  // 当前utc时间戳
            var sign = GetMD5Str(appkey + timeStamp + secretKey);              // 请求签名  

            // 设置url参数
            Dictionary<string, string> urlParams = new Dictionary<string, string>();
            urlParams.Add("keyword", "keyword的值");

            UrlEncoder ins = UrlEncoder.Create();
            List<string> concatParams = new List<string>();
            foreach (KeyValuePair<string, string> param in urlParams)
            {
                concatParams.Add(param.Key + "=" + ins.Encode(param.Value));
            }

            // 发送GET请求
            HttpClient httpClient = new HttpClient();
            httpClient.DefaultRequestHeaders.Add("Auth-version", "2.0");
            httpClient.DefaultRequestHeaders.Add("appkey", appkey);
            httpClient.DefaultRequestHeaders.Add("timestamp", timeStamp);
            httpClient.DefaultRequestHeaders.Add("sign", sign);
            httpClient.DefaultRequestHeaders.Add("Connection", "keep-alive");
            var urlWithParams = baseUrl + "?" + string.Join("&", concatParams.ToArray());
            var get = httpClient.GetAsync(urlWithParams);

            // 输出响应
            Console.WriteLine(get.Result.Content.ReadAsStringAsync().Result);
        }
    }
}

# -*- coding:utf-8 -*-

import requests
import json
import time
import hashlib
from urllib.parse import urlencode


def md5Encode(srcStr):
    '''计算字符串的md5值'''
    m = hashlib.md5()
    m.update(srcStr.encode('utf-8'))
    return m.hexdigest()


# 接口信息
baseUrl = 'https://api.qixin.com/APIService/creditgrade/getTaxpayerListByName'
appkey = '正式appkey'
secretKey = '正式secret_key'
timeStamp = int(time.time()) * 1000

# 设置请求头部信息
headers = {
    'Auth-version': '2.0',              # 指定接口验证版本
    'appkey': appkey,
    'timestamp': str(timeStamp),
    'sign': md5Encode(appkey + str(timeStamp) + secretKey),
    'Connection': 'keep-alive'
}

# 请求参数
urlParams = {
    'keyword': 'keyword的值'
}

# 构造url
url = '{}?{}'.format(baseUrl, urlencode(urlParams))
print(url)

# 调用接口
response = requests.get(url, headers=headers)

# 处理响应数据
jsonContent = json.dumps(str(response.content, encoding='utf-8'))
rspResult = jsonContent.encode('utf-8').decode('unicode-escape')
print(rspResult)