托管 bean 和支持 bean 之间的区别 [英] Difference between managed bean and backing bean
问题描述
我在几个论坛中遇到了术语托管 bean"和支持 bean".很多人认为两者是一样的.但是，似乎有细微的差别.任何人都可以帮助我理解这两个术语之间的确切区别吗?
I came across the terms "managed bean" and "backing bean" in several forums. Many people think both are the same. But, there seems to be a slight difference. Can any one help me to understand the exact difference between these two terms?
推荐答案
改变我的初始答案 - 两者之间没有有意义的区别.tutorial 说支持 bean 后来被声明为托管 bean.所以，总结一下:
Changing my initial answer - there is no meaningful difference between the two. The tutorial says that backing beans are later declared as managed beans. So, to summarize:
- 支持 bean 是脱离上下文的类
- 只要声明托管 bean 与 JSF 托管 bean 设施一起使用，托管 bean 就是支持 bean.
我从来没有真正使用过backing bean"这个词，因为我发现它没有用.因此，您最好只使用托管 bean".请注意，在 JSF 2.0(和 CDI)中，您有 @ManagedBean - 所以您的 bean 是一个托管 bean.
I've never actually used the term "backing bean", because I found no use to it. So you might be better off using only "managed bean". Note that in JSF 2.0 (and in CDI) you have @ManagedBean- so your bean is a managed bean.
BalusC 建议backing bean"是定义，managed bean"是实例.虽然这可能是 JSF 创建者的最初想法，但我认为不值得支持它.例如，CDI 和 spring 对于bean 定义"和bean 实例"没有不同的术语.
BalusC suggested that "backing bean" is the definition, and "managed bean" is the instance. While this might have been the original idea of JSF creators, I don't think it is worth supporting it. CDI and spring for example don't have different term for "bean definition" and "bean instance".
JSF 2.0 规范只几次提到术语支持 bean"，没有任何定义.除此之外，它还提到了backing bean class"，这可能意味着backing bean"!=backing bean class"，这带来了进一步的混乱.
The JSF 2.0 specification mentions the term "backing bean" only a few times, with no definition whatsoever. In addition to that it mentions "backing bean class", which might mean that "backing bean" != "backing bean class", which brings further confusion.
所以总结一下 - 对我来说两者都是可以互换的，我会坚持只使用托管 bean"
So to conclude - for me both are interchangeable, and I'd stick to only using "managed bean"
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