我怎么能有资格与使用注释配置文件变量的自动装配的财产？ [英] How can I qualify an autowired property with a variable from a config file using annotations?

问题描述

我的具体问题是，我已经配置了两个bean实现了相同的接口和我有了这个接口的类型的属性第三豆。我注入使用配置属性的属性。因此，假设RemoteDataSource和LocalDataSource落实和的IDataSource有dao1的IDataSource类型的属性，我的XML配置可能是这样的：

My specific problem is that I have configured two beans that implement the same interface and I have a third bean that has a property of that interface's type. I inject the property using a config property. So, assuming RemoteDataSource and LocalDataSource implement IDataSource and dao1 has a property of type IDataSource, my XML config might look like this:

<bean id="datasource1" class="com.foo.RemoteDataSource">
  <property name="url">${url}</property>
</bean>
<bean id="datasource2" class="com.foo.LocalDataSource">
  <property name="path">${filepath}</property>
</bean>
<bean id="dao1" class="com.foo.MyDAO">
  <property name="dataSource">${datasource}</property>
</bean>

通过URL，文件路径和数据源正在包含的属性文件中定义。我们现在正在为注解驱动的配置一推，我不知道如何标注吾道将在属性文件中配置的数据源。我想这样做，但它显然是不允许的：

With url, filepath and datasource being defined in an included properties file. We are now making a push for annotation-driven configuration and I'm not sure how to annotate my dao to put the data source configured in the property file. I want to do something like this, but it is evidently not allowed:

@Autowired
@Qualifier("${datasource}")
public void setDataSource(IDataSource datasource) {...}

注：这是春季3

NB: this is spring 3

推荐答案

我的解决办法是这样的：

My solution was thus:

@Autowired
public void setDataProviders(Map<String,IDataProvider> dataProviders) {
    this.dataProviders = dataProviders;
}

@Autowired
@Value("${cms}")
public void setDataProviderName(String dataProviderName) {
    this.dataProviderName = dataProviderName;
}

public IDataProvider getDataProvider() {
    return dataProviders.get(dataProviderName);
}

注：我改变了命名为DataProvider的，从规范的DataSource这，这不是消除歧义。它实际上只是一个自制的REST客户端。

NB: I changed that naming to DataProvider to disambiguate from the canonical DataSource which this isn't. It's actually just a homemade REST client.

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