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' };
}