使用Spring初始化Properties对象

Question

public class StorageConfiguration extends Properties {
    private final String PROPERTY_NAME_1 = "property.key";

    public String getProperty1() {
        return this.getProperty(PROPERTY_NAME_1);
    }

    public void setProperty1(String property1) {
        this.setProperty(PROPERTY_NAME_1, property1);
    }
}

public class Storage {
    StorageConfiguration storageConfiguration;

    @Autowired
    public void setStorageConfiguration(StorageConfiguration storageConfiguration) {
        this.storageConfiguration = storageConfiguration;
    }

    public void init() {
        // Initialize properties in this class using StorageConfiguration.
    }
}

<bean id="storage" class="com.k4rthik.labs.Storage" init-method="init">
    <property name="storageConfiguration" ref="storageConfiguration" />
</bean>
<bean id="storageConfiguration"
      class="org.springframework.beans.factory.config.PropertiesFactoryBean">
    <property name="storageConfiguration">
        <props>
            <prop key="property.key">property_value</prop>
        </props>
    </property>
</bean>

我预计Spring会通过将属性“property.key”设置为“property_value”来初始化StorageConfiguration对象。

但是，我得到以下异常

org.springframework.beans.factory.beanCreationException：创建类路径资源[applicationContext.xml]中定义的名为“storage”的bean时出错：在设置bean属性“authorization config”时无法解析对bean“storage configuration”的引用；嵌套异常是org.springframework.beans.factory.beanCreationException：创建类路径资源[applicationContext.xml]中定义的名为“authorization config”的bean时出错：设置属性值时出错；嵌套异常是org.springframework.beans.notwritablePropertyException：bean类[org.springframework.beans.factory.config.propertiesFactoryBean]的无效属性“Storage Configuration”：bean属性“Storage Configuration”不可写或具有无效的setter方法。setter的参数类型与getter的返回类型匹配吗？

Answer 1

PropertiesFactoryBean创建properties类型的bean。

若要创建StorageConfiguration，可以创建一个复制构造函数

public class StorageConfiguration
{
    public StorageConfiguration(Properties defaults) {
        super(defaults);
    }
}

那么这个应该管用：

<bean id="storageConfiguration" class="..StorageConfiguration">
  <constructor-arg>

   <bean class="org.springframework.beans.factory.config.PropertiesFactoryBean">
    <property name="properties">
        <props>
            <prop key="property.key">property_value</prop>
        </props>
    </property>
  <bean>
  </constructor-arg>
</bean>

<bean id="storageConfiguration" class="..StorageConfiguration">
  <constructor-arg>   
        <props>
            <prop key="property.key">property_value</prop>
        </props>
  </constructor-arg>
</bean>