What should I do if the JAVA WeChat public account development TOKEN fails to verify?

 public class SignUtil {
    
      private static String token = "WnbVm6GTQj4BPmLliSday4K";//这里是自定义的token，需和你提交的token一致
 
      /**
       * 校验签名
       * 
       * @param signature
      *            签名
     * @param timestamp
      *            时间戳
      * @param nonce
      *            随机数
     * @return 布尔值
      */
     public static boolean checkSignature(String signature, String timestamp, String nonce) {
         String checktext = null;
         if (null != signature) {
             // 对ToKen,timestamp,nonce 按字典排序
             String[] paramArr = new String[] { token, timestamp, nonce };
             Arrays.sort(paramArr);
            
             try {
               MessageDigest md = MessageDigest.getInstance("SHA-1");
              // 对接后的字符串进行sha1加密
              byte[] digest = md.digest(content.toString().getBytes());
               checktext = byteToStr(digest);
           } catch (NoSuchAlgorithmException e) {
              e.printStackTrace();
           }
     }
       // 将加密后的字符串与signature进行对比
       return checktext != null ? checktext.equals(signature.toUpperCase()) : false;
    }
    /**
     * 将字节数组转化为16进制字符串
    * 
      * @param byteArrays
     *            字符数组
    * @return 字符串
     */
   private static String byteToStr(byte[] byteArrays) {
        String str = "";
        for (int i = 0; i < byteArrays.length; i++) {
           str += byteToHexStr(byteArrays[i]);
     }
       return str;
  }
   /**
    * 将字节转化为十六进制字符串
    * 
  * @param myByte
     *            字节
 * @return 字符串
  */
  private static String byteToHexStr(byte myByte) {
     char[] Digit = { &#39;0&#39;, &#39;1&#39;, &#39;2&#39;, &#39;3&#39;, &#39;4&#39;, &#39;5&#39;, &#39;6&#39;, &#39;7&#39;, &#39;8&#39;, &#39;9&#39;, &#39;A&#39;, &#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;, &#39;F&#39; };
        char[] tampArr = new char[2];
     tampArr[0] = Digit[(myByte >>> 4) & 0X0F];
        tampArr[1] = Digit[myByte & 0X0F];
        String str = new String(tampArr);
      return str;
     }
 }

 if (StringUtils.isNotBlank(request.getParameter("signature"))) {
             String signature = request.getParameter("signature");
            String timestamp = request.getParameter("timestamp");
             String nonce = request.getParameter("nonce");
             String echostr = request.getParameter("echostr");
             LOGGER.info("signature[{}], timestamp[{}], nonce[{}], echostr[{}]", signature, timestamp, nonce, echostr);
             if (SignUtil.checkSignature(signature, timestamp, nonce)) {
                LOGGER.info("数据源为微信后台，将echostr[{}]返回！", echostr);
                response.getOutputStream().println(echostr);
             }
         }