《Spring Recipes》第二章笔记:Declaring Beans from Object Properties
问题
在配置文件中将一个对象的属性声明为bean。
解决方案
使用Spring自带的PropertyPathFactoryBean工厂bean或者使用从Spring2.5开始的<util:property-path>标签。
使用PropertyPathFactoryBean
bean:
public class ProductRanking {
private Product bestSeller;
public Product getBestSeller() {
return bestSeller;
}
public void setBestSeller(Product bestSeller) {
this.bestSeller = bestSeller;
}
}
配置文件:
<beans ...>
<bean id="bestSeller" class="org.springframework.beans.factory.config.PropertyPathFactoryBean">
<property name="targetObject" ref="productRanking" />
<property name="propertyPath" value="bestSeller" />
</bean>
<bean id="productRanking" class="com.apress.springrecipes.shop.ProductRanking">
<property name="bestSeller">
<bean class="com.apress.springrecipes.shop.Disc">
<property name="name" value="CD-RW" />
<property name="price" value="1.5" />
</bean>
</property>
</bean>
</beans>
使用<util:property-path>
配置文件:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.0.xsd">
...
<util:property-path id="bestSeller" path="productRanking.bestSeller" />
</beans>