网易云信消息抄送服务的第三方接口示例（Java）

 package com.netease.nim.route;

 import com.alibaba.fastjson.JSONObject;
 import com.netease.nim.route.CheckSumBuilder;
 import org.apache.commons.io.IOUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.ResponseBody;
 import javax.servlet.http.HttpServletRequest;
 import java.io.IOException;

 @Controller
 @RequestMapping(value = {"/route"})
 public class RouteController {
     public static final Logger logger = LoggerFactory
             .getLogger(RouteController.class);

     // 需要改成自身应用的appSecret
     private final String appSecret = "7bb79g40f44j";

     @RequestMapping(value = {"/mockClient.action"}, method = {RequestMethod.POST})
     @ResponseBody
     public JSONObject mockClient(HttpServletRequest request)
             throws Exception {
         JSONObject result = new JSONObject();
         try {
             // 获取请求体
             byte[] body = readBody(request);
             if (body == null) {
                 logger.warn("request wrong, empty body!");
                 result.put("code", 414);
                 return result;
             }

             // 获取部分request header，并打印
             String ContentType = request.getContentType();
             String AppKey = request.getHeader("AppKey");
             String CurTime = request.getHeader("CurTime");
             String MD5 = request.getHeader("MD5");
             String CheckSum = request.getHeader("CheckSum");
             logger.info("request headers: ContentType = {}, AppKey = {}, CurTime = {}, " +
                     "MD5 = {}, CheckSum = {}", ContentType, AppKey, CurTime, MD5, CheckSum);

             // 将请求体转成String格式，并打印
             String requestBody = new String(body, "utf-8");
             logger.info("request body = {}", requestBody);

             // 获取计算过的md5及checkSum
             String verifyMD5 = CheckSumBuilder.getMD5(requestBody);
             String verifyChecksum = CheckSumBuilder.getCheckSum(appSecret, verifyMD5, CurTime);
             logger.debug("verifyMD5 = {}, verifyChecksum = {}", verifyMD5, verifyChecksum);

             // TODO: 比较md5、checkSum是否一致，以及后续业务处理

             result.put("code", 200);
             return result;
         } catch (Exception ex) {
             logger.error(ex.getMessage(), ex);
             result.put("code", 414);
             return result;
         }
     }

     private byte[] readBody(HttpServletRequest request) throws IOException {
         if (request.getContentLength() > 0) {
             byte[] body = new byte[request.getContentLength()];
             IOUtils.readFully(request.getInputStream(), body);
             return body;
         } else
             return null;
     }

 }

 package com.netease.nim.route;

 import java.security.MessageDigest;

 public class CheckSumBuilder {
     // 计算并获取CheckSum
     public static String getCheckSum(String appSecret, String nonce, String curTime) {
         return encode("sha1", appSecret + nonce + curTime);
     }

     // 计算并获取md5值
     public static String getMD5(String requestBody) {
         return encode("md5", requestBody);
     }

     private static String encode(String algorithm, String value) {
         if (value == null) {
             return null;
         }
         try {
             MessageDigest messageDigest
                     = MessageDigest.getInstance(algorithm);
             messageDigest.update(value.getBytes());
             return getFormattedText(messageDigest.digest());
         } catch (Exception e) {
             throw new RuntimeException(e);
         }
     }
     private static String getFormattedText(byte[] bytes) {
         int len = bytes.length;
         StringBuilder buf = new StringBuilder(len * 2);
         for (int j = 0; j < len; j++) {
             buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
             buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
         }
         return buf.toString();
     }
     private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5',
             '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
 }