1.概述（about Spring Web Folw）
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- Spring Web Flow是spring社区一个子project
- Spring Web Flow builds on Spring MVC
- Spring Web Flow的特色功能是：它实现了web apllication的“流”。类似于业务流程引擎（Activiti）的功能，将一系列的业务处理阶段封装成一个工作流，引导系统的使用者（也即用户）顺着封装好的“工作流”一步步完成每个阶段的任务（task），最终到达工作流程的尾部，整个流程结束。A flow spans【跨越】 multiple HTTP requests, has state【拥有状态】, deals with transactional data【处理事务数据】, is reusable【是可重用的】, and may be dynamic【动态的】 and long-running in nature..
- Spring Web Flow的应用场景
- Spring Web Flow适用于开发拥有如下特征的web application:
- There is a clear start and an end point.
- The user must go through a set of screens in a specific order【特定的顺序】.
- The changes are not finalized until the last step.
- Once complete it shouldn't be possible to repeat a transaction accidentally
- 一些实际应用场景（Spring Web Flow的应用实例）
- checking in for a flight,
- applying for a loan,
- shopping cart checkout,
- adding a confirmation step to a form.
- Spring Web Flow适用于开发拥有如下特征的web application: