本文对比了Struts1与Struts2的主要特点，指出Struts1中的Action为单例需确保线程安全，而Struts2中的Action为每次请求创建一个实例；Struts1使用ActionForm收集输入，而Struts2使用Action属性作为输入；此外还介绍了Struts2的核心包和实用包。
@Author: cjcj cj.yangjun@gmail.com <c-j.iteye.com>
一、体系结构：
S1:
[img]http://c-j.iteye.com/upload/picture/pic/36251/555cebf2-d6ea-3daa-bd01-97a4ab645869.gif[/img]
[color=red]没找到合适的S1体系结构图。[/color]
S2:
[img]http://c-j.iteye.com/upload/picture/pic/36255/3b469af9-e34a-353e-a0d8-b2077b9ec6cf.png[/img]
二、Comparing Struts 1 and 2
[color=red] S1[/color]
[b]Struts 1 requires Action classes to extend an abstract base class.
Struts 1 Actions are singletons and must be thread-safe.
Struts 1 Actions have dependencies on the HttpServletRequest and HttpServletResponse is passed to the execute method when an Action is invoked.
Struts 1 Actions can not be tested.
Struts 1 uses an ActionForm object to capture input.
Struts 1 all the Actions in the module must share the same lifecycle.
[/b]
[color=red]S2[/color]
[b]An Struts 2 Action may implement an Action interface.
Struts 2 Action objects are instantiated for each request, so there are no thread-safety issues.
Struts 2 Actions are not coupled to a container. Most often the servlet contexts are represented as simple Maps, allowing Actions to be tested in isolation.
Struts 2 Actions can be tested.
Struts 2 uses Action properties as input properties.
Struts 2 supports creating different lifecycles on a per Action [/b]
三、Source Arch
[img]/upload/attachment/99916/9d04a963-6914-366a-9e48-13b81225f580.png[/img]
[color=red]org.apache.struts2.dispatcher 核心包，最重要的类都放在该包中。
org.apache.struts2.util 实用包。[/color]
一、体系结构：
S1:
[img]http://c-j.iteye.com/upload/picture/pic/36251/555cebf2-d6ea-3daa-bd01-97a4ab645869.gif[/img]
[color=red]没找到合适的S1体系结构图。[/color]
S2:
[img]http://c-j.iteye.com/upload/picture/pic/36255/3b469af9-e34a-353e-a0d8-b2077b9ec6cf.png[/img]
二、Comparing Struts 1 and 2
[color=red] S1[/color]
[b]Struts 1 requires Action classes to extend an abstract base class.
Struts 1 Actions are singletons and must be thread-safe.
Struts 1 Actions have dependencies on the HttpServletRequest and HttpServletResponse is passed to the execute method when an Action is invoked.
Struts 1 Actions can not be tested.
Struts 1 uses an ActionForm object to capture input.
Struts 1 all the Actions in the module must share the same lifecycle.
[/b]
[color=red]S2[/color]
[b]An Struts 2 Action may implement an Action interface.
Struts 2 Action objects are instantiated for each request, so there are no thread-safety issues.
Struts 2 Actions are not coupled to a container. Most often the servlet contexts are represented as simple Maps, allowing Actions to be tested in isolation.
Struts 2 Actions can be tested.
Struts 2 uses Action properties as input properties.
Struts 2 supports creating different lifecycles on a per Action [/b]
三、Source Arch
[img]/upload/attachment/99916/9d04a963-6914-366a-9e48-13b81225f580.png[/img]
[color=red]org.apache.struts2.dispatcher 核心包，最重要的类都放在该包中。
org.apache.struts2.util 实用包。[/color]
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