code: private static void initMiddleCert() {
  		LogUtil.writeLog("加载中级证书==>"+SDKConfig.getConfig().getMiddleCertPath());
  		if (!isEmpty(SDKConfig.getConfig().getMiddleCertPath())) {
  			middleCert = initCert(SDKConfig.getConfig().getMiddleCertPath());
  			LogUtil.writeLog("Load MiddleCert Successful");
  		} else {
  			LogUtil.writeLog("WARN: acpsdk.middle.path is empty");
  		}
  	}
docs: 用配置文件acp_sdk.properties配置路径 加载敏感信息加密证书