Java 在 Spring bean 上下文中声明对象数组
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Declaring an array of objects in a Spring bean context
提问by Alex Ciminian
I'm trying to create an array of objects in a Spring context file so I can inject it to a constructor that's declared like this:
我正在尝试在 Spring 上下文文件中创建一个对象数组，以便我可以将它注入到这样声明的构造函数中：
public RandomGeocodingService(GeocodingService... services) { }
I'm trying to use the <array>tag:
我正在尝试使用<array>标签：
<bean id="googleGeocodingService" class="geocoding.GoogleGeocodingService">
<constructor-arg ref="proxy" />
<constructor-arg value="" />
</bean>
<bean id="geocodingService" class="geocoding.RandomGeocodingService">
<constructor-arg>
<array value-type="geocoding.GeocodingService">
<!-- How do I reference the google geocoding service here? -->
</array>
</constructor-arg>
</bean>
I haven't been able to find an example or something in the in the documentation on how to do this. Also, you have any suggestions for a better way of acheiving what I'm trying to do, please let me know :).
我无法在文档中找到有关如何执行此操作的示例或内容。此外，您对更好地实现我正在尝试做的事情有任何建议，请告诉我:)。
采纳答案by skaffman
That's because there's no such thing as <array>, there's only <list>.
那是因为没有这样的东西<array>，只有<list>.
The good news is that Spring will auto-convert between lists and arrays as required, so defined your array as a <list>, and Spring will be coerce it into an array for you.
好消息是 Spring 将根据需要在列表和数组之间自动转换，因此将您的数组定义为 a <list>，Spring 会为您将其强制转换为数组。
This should work:
这应该有效：
<bean id="googleGeocodingService" class="geocoding.GoogleGeocodingService">
<constructor-arg ref="proxy" />
<constructor-arg value="" />
</bean>
<bean id="geocodingService" class="geocoding.RandomGeocodingService">
<constructor-arg>
<list>
<ref bean="googleGeocodingService"/>
</list>
</constructor-arg>
</bean>
Spring will also coerce a single bean into a list, if required:
如果需要，Spring 还会将单个 bean 强制转换为列表：
<bean id="geocodingService" class="geocoding.RandomGeocodingService">
<constructor-arg>
<ref bean="googleGeocodingService"/>
</constructor-arg>
</bean>
回答by earldouglas
Check out the util schema.
查看util 架构。
回答by wandi.darko
Spring can automatically convert a list into an array[]
Spring 可以自动将列表转换为数组[]
check it out http://forum.springsource.org/showthread.php?37767-Injecting-String-Array
看看http://forum.springsource.org/showthread.php?37767-Injecting-String-Array
<bean name="test" class="Test">
<property name="values" value="hugo,emil"></property>
</bean>
回答by Sandoval0992
I would like to know why the user who gave the best answer says ...
我想知道为什么给出最佳答案的用户说...
"That's because there's no such thing as <array>, there's only <list>"
“那是因为没有<array>，只有<list>”
I'm currently using <array>tag to inject an array of objects into a bean.
我目前正在使用<array>标记将一组对象注入到 bean 中。
Take a look at the following code...
看看下面的代码...
<bean id="song1" class="mx.com.company.songs.Song">
<property name="name" value="Have you ever seen the rain?"/>
</bean>
<bean id="song2" class="mx.com.company.songs.Song">
<property name="name" value="La bamba"/>
</bean>
<bean id="guitarPlayer" class="mx.com.company.musician.GuitarPlayer">
<property name="songs">
<array>
<ref bean="song1"/>
<ref bean="song2"/>
</array>
</property>
</bean>
