java键对值SHA256加密接口请求

 import org.apache.http.HttpResponse;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.util.EntityUtils;
 import javax.crypto.Mac;
 import javax.crypto.spec.SecretKeySpec;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
 import java.util.*;
 import java.util.Map;

 public class order {
      private static String create_order(String ip, String merchantId, String key, String payWay, String amount)
              throws NoSuchAlgorithmException, InvalidKeyException, IOException {
         // url参数
         Map<String, Object> url_map = new TreeMap<String, Object>();
         url_map.put("merchantId", merchantId);
         url_map.put("signatureMethod", "HmacSHA256");
         url_map.put("signatureVersion", "1");
         url_map.put("timestamp", System.currentTimeMillis());

         // url参数拼接
         StringBuilder url_data = new StringBuilder();
         for (Map.Entry<String, Object> url :url_map.entrySet())  {
             url_data.append(url.getKey()).append("=").append(url.getValue()).append("&");
         }
         url_data = new StringBuilder(url_data.substring(0, url_data.length() - 1));
 //        System.out.println(url_data);

         // body参数
         Map<String, Object> body_map = new TreeMap<String, Object>();
         body_map.put("jUserId", "666666");
         body_map.put("jUserIp", "110.110.110.110");
         body_map.put("jOrderId", Long.toString(System.currentTimeMillis()));
         body_map.put("orderType", "1");
         body_map.put("payWay", payWay);
         body_map.put("amount", amount);
         body_map.put("currency", "CNY");
         body_map.put("jUserName", "奥里给");
         body_map.put("notifyUrl", "https://test.com");

         // 全部参数
         Map<String, Object> all_map = new TreeMap<String, Object>();
         all_map.putAll(url_map);
         all_map.putAll(body_map);

         // 参数拼接
         StringBuilder all_data = new StringBuilder();
         for (Map.Entry<String, Object> url :all_map.entrySet())  {
             all_data.append(url.getKey()).append("=").append(url.getValue()).append("&");
         }

         all_data = new StringBuilder(all_data.substring(0, all_data.length() - 1));
 //        System.out.println("data：" + all_data);

         // HmacSHA256加密
         Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
         SecretKeySpec secret_key = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "HmacSHA256");
         sha256_HMAC.init(secret_key);
         byte[] array = sha256_HMAC.doFinal(all_data.toString().getBytes(StandardCharsets.UTF_8));
         StringBuilder sec = new StringBuilder();
         for (byte item : array) {
             sec.append(Integer.toHexString((item & 0xFF) | 0x100), 1, 3);
         }
         String signature_data = sec.toString().toUpperCase();
         System.out.println("signature：" + signature_data);

         String URL = ip + "?" + url_data + "&signature=" + signature_data;
         System.out.println("url：" + URL);
         HttpPost httppost = new HttpPost(URL);

         // 请求body参数拼接
         StringBuilder list_data = new StringBuilder();
         for (Map.Entry<String, Object> m :body_map.entrySet())  {
             list_data.append(m.getKey()).append("=").append(m.getValue()).append("&");
         }
         list_data = new StringBuilder(list_data.substring(0, list_data.length() - 1));
         System.out.println("data：" + list_data);

         // 创建订单-发送请求
         StringEntity entity = new StringEntity(list_data.toString(), "utf-8");
         entity.setContentEncoding("UTF-8");
         entity.setContentType("application/x-www-form-urlencoded");
         httppost.setEntity(entity);
         HttpClient httpClient = new DefaultHttpClient();
         HttpResponse response = httpClient.execute(httppost);
         String strResult = EntityUtils.toString(response.getEntity());
         System.out.println("result：" + strResult + "\t");
         httppost.releaseConnection();

         return strResult;
      }

     public static void main(String[] args) throws Exception {
         create_order("https://test.com", "merchantId",
                     "key", "pay", "666");
     }
 }