[英]Initializing a Properties object using Spring
I have a class that extends Properties used to store some specialized key names: 我有一个扩展属性的类,该属性用于存储一些专用键名:
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);
}
}
And a class that uses these properties: 使用这些属性的类:
public class Storage {
StorageConfiguration storageConfiguration;
@Autowired
public void setStorageConfiguration(StorageConfiguration storageConfiguration) {
this.storageConfiguration = storageConfiguration;
}
public void init() {
// Initialize properties in this class using StorageConfiguration.
}
}
I have my Spring set up to initialize Storage and StorageConfiguration like so: 我已经设置了Spring来初始化Storage和StorageConfiguration,如下所示:
<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>
What I expected would happen was Spring would initialize the StorageConfiguration object by setting the property "property.key" to "property_value". 我期望发生的事情是Spring将通过将属性“ property.key”设置为“ property_value”来初始化StorageConfiguration对象。
However I get the following exception 但是我得到以下异常
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'storage' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean 'storageConfiguration' while setting bean property 'authorizationConfig';
org.springframework.beans.factory.BeanCreationException:在类路径资源[applicationContext.xml]中创建名称为“ storage”的bean时出错:设置bean属性“ authorizationConfig”时无法解析对bean“ storageConfiguration”的引用; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authorizationConfig' defined in class path resource [applicationContext.xml]: Error setting property values;
嵌套的异常是org.springframework.beans.factory.BeanCreationException:创建在类路径资源[applicationContext.xml]中定义的名称为'authorizationConfig'的bean时出错:设置属性值时出错; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'storageConfiguration' of bean class [org.springframework.beans.factory.config.PropertiesFactoryBean]: Bean property 'storageConfiguration' is not writable or has an invalid setter method.
嵌套的异常是org.springframework.beans.NotWritablePropertyException:Bean类[org.springframework.beans.factory.config.PropertiesFactoryBean]的无效属性'storageConfiguration':Bean属性'storageConfiguration'无法写或具有无效的setter方法。 Does the parameter type of the setter match the return type of the getter?
setter的参数类型是否与getter的返回类型匹配?
As you can see, I have an autowired setter for storageConfiguration in the Storage class, so I don't really see what's wrong here. 如您所见,我在Storage类中有一个用于storageConfiguration的自动连线设置器,因此我真的看不到这里有什么问题。
PropertiesFactoryBean creates a bean of type Properties. PropertiesFactoryBean创建一个类型为Properties的bean。
To create a StorageConfiguration, you could create a Copy constructor 要创建StorageConfiguration,您可以创建一个Copy构造函数
public class StorageConfiguration
{
public StorageConfiguration(Properties defaults) {
super(defaults);
}
}
Then this should work: 然后这应该工作:
<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>
Or even: 甚至:
<bean id="storageConfiguration" class="..StorageConfiguration">
<constructor-arg>
<props>
<prop key="property.key">property_value</prop>
</props>
</constructor-arg>
</bean>
it should be 它应该是
<bean id="storage" class="com.k4rthik.labs.Storage" init-method="init">
<property name="storageConfiguration">
<props>
<prop key="property.key">property_value</prop>
</props>
</property>
</bean>
the config 配置
<bean id="storageConfiguration"
class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="storageConfiguration">
<props>
<prop key="property.key">property_value</prop>
</props>
</property>
</bean>
means that StorageConfiguration
of type org.springframework.beans.factory.config.PropertiesFactoryBean
has a property called storageConfiguration
, which doesn't look like as per your code 表示类型为
org.springframework.beans.factory.config.PropertiesFactoryBean
StorageConfiguration
具有一个名为storageConfiguration
的属性,该属性与您的代码不同
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