认识smack3.0.4基本对象——From

From收集的数据形式，可以是以下类型：

• form -> 表示From需要填充.
• submit -> 表示From已经填充，这是从From中返回的数据
• cancel -> 表示From已经取消，告诉请求者连接信息. .
• result -> 表示数据结果来自From, 或者其他查询.

Represents a Form for gathering data. The form could be of the following types:

• form -> Indicates a form to fill out.
• submit -> The form is filled out, and this is the data that is being returned from the form.
• cancel -> The form was cancelled. Tell the asker that piece of information.
• result -> Data results being returned from a search, or some other query.