JSF中关于javax.faces.STATE_SAVING_METHOD的一个问题?

看<JSF in Action>里讲JSF的生命周期时,有下面一段:

Aviewrepresentsallofthecomponentsthatmakeupaparticularpage.Itcanbe

storedontheclient(usuallyinahiddenfieldonabrowser)orontheserver(usu-

allyinthesession).

意思是说:"在JSF中,一个视图代表着组成整个特定页面的组件,它可以被存储在客户端(通常以隐藏域的方式存在浏览器中),也可以存储到服务器上(通常以Session的方式.)"

存放在服务器上的情况先不考虑,对存放到client端的方法有些疑问,我看了下生成HTML的代码,其中是有一个element,它的内容如下:

    <input type="hidden" name="javax.faces.ViewState" id="javax.faces.ViewState" value="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" />

看的很晕.

web.xml中相关的配置为:

<context-param>

<description>Statesavingmethod:"client"or"server"(=default)

SeeJSFSpecification2.5.3</description>

<param-name>javax.faces.STATE_SAVING_METHOD</param-name>

<param-value>client</param-value>

</context-param>

我怀疑这就是上面所说的"以隐藏域的方式存到浏览器上"的表现.

不过,我的疑问是:

1,先不说这个hiddenvariable有这么大,即使很小,那它有什么用?在提交时再传回Server上,还原出以前的状态么?

2,在什么情况下要用这个?与存在Server端比有什么优缺点?