Spring bean别名用法 [英] Spring bean alias usage

问题描述

我知道bean的别名在春天意味着什么。但我想知道使用别名的用例。为什么有人想使用别名而不是名字来引用bean？

I know what bean alias means in spring. But I want to know the use cases for making use of alias. Why would somebody want to refer a bean using alias name instead of its name?

提前致谢。

推荐答案

我见过的用法如下所示：您有两个给定接口的实例（ SomeBean ）：一个用于环境A，另一个用于环境B.因此，您定义了两个bean：一个名为someBeanForA ，另一个名为someBeanForB。

A usage I've seen is the following: you have two instances of a given interface (SomeBean): one for environment A, and one for environment B. So you define two beans: one named "someBeanForA", and the other one named "someBeanForB".

必须注入此SomeBean的bean不知道必须使用哪一个：它取决于环境。所以他们使用别名：

The beans where this SomeBean must be injected don't know which one they must use: it depends on the environment. So they use an alias:

@Autowired
@Qualifier("someBeanAlias")
private SomeBean someBean;

部署到环境A时，XML文件中的别名指向someBeanA。部署到环境B时，XML文件中的别名指向someBeanB。

When deploying to the environment A, the alias in the XML file points to someBeanA. When deploying to the environment B, the alias in the XML file points to someBeanB.

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