在Spring bean上下文中声明一个对象数组 [英] Declaring an array of objects in a Spring bean context

问题描述

我正在尝试在Spring上下文文件中创建一个对象数组，因此我可以将它注入一个声明如下的构造函数：

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:

public RandomGeocodingService(GeocodingService... services) { }

我正在尝试使用< array> 标记：

<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>

我无法在文档中找到有关如何操作的示例或内容这个。另外，你有任何建议可以更好地实现我想要做的事情，请告诉我:)。

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 :).

推荐答案

<那是因为没有< array> 这样的东西，只有< list> 。

好消息是Spring会根据需要在列表和数组之间自动转换，因此将数组定义为< list> ，Spring会将它强制转换为数组。

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.

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>

如果需要，Spring还会将单个bean强制转换为列表：

Spring will also coerce a single bean into a list, if required:

<bean id="geocodingService" class="geocoding.RandomGeocodingService">
    <constructor-arg>
       <ref bean="googleGeocodingService"/>
    </constructor-arg>
</bean>

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