测试公众平台配置及调用效果如下：

后台代码如下：

@GetMapping("/handleWxCheckSignature")
public String handleWxCheckSignature ( HttpServletRequest request) throws Exception {
   log.info("===========>checkSign");
   //获取微信请求参数
   String signature = request.getParameter ("signature");
   String timestamp = request.getParameter ("timestamp");
   String nonce = request.getParameter ("nonce");
   String echostr = request.getParameter ("echostr");

   log.info("开始校验此次消息是否来自微信服务器，param->signature:{},\ntimestamp:{},\nnonce:{},\nechostr:{}",
         signature, timestamp, nonce, echostr);

   boolean checkFlag = this.checkSignature(signature, timestamp, nonce);
   log.info("校验是否成功结果:{}",checkFlag);
   if (checkFlag) {
      return echostr;
   }
   return "";
}

加解密代码如下：

public static boolean checkSignature(String signature, String timestamp, String nonce) {
   String[] arr = {"qweasdzxc", timestamp, nonce};
   Arrays.sort(arr);
   StringBuilder stringBuilder = new StringBuilder();
   for (String param : arr) {
      stringBuilder.append(param);
   }

   String hexString = SHA1(stringBuilder.toString());
   return signature.equals(hexString);
}

private static String SHA1(String str) {
   MessageDigest md;
   try {
      md = MessageDigest.getInstance("SHA-1");
      byte[] digest = md.digest(str.getBytes());
      return toHexString(digest);
   } catch (NoSuchAlgorithmException e) {
      log.info("校验令牌Token出现错误：{}", e.getMessage());
   }
   return "";
}

/**
 * 字节数组转化为十六进制
 *
 * @param digest 字节数组
 * @return String
 */
private static String toHexString(byte[] digest) {
   StringBuilder hexString = new StringBuilder();
   for (byte b : digest) {
      String shaHex = Integer.toHexString(b & 0xff);
      if (shaHex.length() < 2) {
         hexString.append(0);
      }
      hexString.append(shaHex);
   }
   return hexString.toString();
}

解密后返回值为true，已经按照文档要求返回echostr 参数内容，依旧提示配合失败，请问是什么原因