接口调用之后如何处理返回结果

<?xml version="1.0" encoding="UTF-8"?><!--结果的根结点-->

<Error>

    <RequestId>540CFF28-407A-40B5-B6A5-74Bxxxxxxxxx</RequestId> <!--请求 ID-->

    <HostId>ecs.aliyuncs.com</HostId> <!--服务节点-->

    <Code>MissingParameter.CommandId</Code> <!--错误码-->

    <Message>The input parameter “CommandId” that is mandatory for processing this request is not supplied.</Message> <!--错误信息-->

</Error>

{

    "RequestId": "540CFF28-407A-40B5-B6A5-74Bxxxxxxxxx", /* 请求 ID */

    "HostId": "ecs.aliyuncs.com", /* 服务节点 */

    "Code": "MissingParameter.CommandId", /* 错误码 */

    "Message": "The input parameter “CommandId” that is mandatory for processing this request is not supplied." /* 错误信息 */

}