public class MethodInvokingFactoryBean extends MethodInvokingBean implements FactoryBean<Object>
FactoryBean which returns a value which is the result of a static or instance
 method invocation. For most use cases it is better to just use the container's
 built-in factory method support for the same purpose, since that is smarter at
 converting arguments. This factory bean is still useful though when you need to
 call a method which doesn't return any value (for example, a static class method
 to force some sort of initialization to happen). This use case is not supported
 by factory methods, since a return value is needed to obtain the bean instance.
 Note that as it is expected to be used mostly for accessing factory methods,
 this factory by default operates in a singleton fashion. The first request
 to getObject() by the owning bean factory will cause a method invocation,
 whose return value will be cached for subsequent requests. An internal
 singleton property may be set to "false", to cause this
 factory to invoke the target method each time it is asked for an object.
 
NOTE: If your target method does not produce a result to expose, consider
 MethodInvokingBean instead, which avoids the type determination and
 lifecycle limitations that this MethodInvokingFactoryBean comes with.
 
This invoker supports any kind of target method. A static method may be specified
 by setting the targetMethod property to a String representing
 the static method name, with targetClass specifying the Class
 that the static method is defined on. Alternatively, a target instance method may be
 specified, by setting the targetObject property as the target
 object, and the targetMethod property as the name of the
 method to call on that target object. Arguments for the method invocation may be
 specified by setting the arguments property.
 
This class depends on afterPropertiesSet() being called once
 all properties have been set, as per the InitializingBean contract.
 
An example (in an XML based bean factory definition) of a bean definition which uses this class to call a static factory method:
<bean id="myObject" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="staticMethod" value="com.whatever.MyClassFactory.getInstance"/> </bean>
An example of calling a static method then an instance method to get at a Java system property. Somewhat verbose, but it works.
<bean id="sysProps" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="targetClass" value="java.lang.System"/> <property name="targetMethod" value="getProperties"/> </bean> <bean id="javaVersion" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="targetObject" ref="sysProps"/> <property name="targetMethod" value="getProperty"/> <property name="arguments" value="java.version"/> </bean>
MethodInvokingBean, 
MethodInvokerOBJECT_TYPE_ATTRIBUTE| Constructor and Description | 
|---|
| MethodInvokingFactoryBean() | 
| Modifier and Type | Method and Description | 
|---|---|
| void | afterPropertiesSet()Invoked by the containing  BeanFactoryafter it has set all bean properties
 and satisfiedBeanFactoryAware,ApplicationContextAwareetc. | 
| Object | getObject()Returns the same value each time if the singleton property is set
 to "true", otherwise returns the value returned from invoking the
 specified method on the fly. | 
| Class<?> | getObjectType()Return the type of object that this FactoryBean creates,
 or  nullif not known in advance. | 
| boolean | isSingleton()Is the object managed by this factory a singleton? That is,
 will  FactoryBean.getObject()always return the same object
 (a reference that can be cached)? | 
| void | setSingleton(boolean singleton)Set if a singleton should be created, or a new object on each
  getObject()request otherwise. | 
getDefaultTypeConverter, invokeWithTargetException, resolveClassName, setBeanClassLoader, setBeanFactorydoFindMatchingMethod, findMatchingMethod, getTypeConverter, registerCustomEditor, setTypeConverterpublic void setSingleton(boolean singleton)
getObject() request otherwise. Default is "true".public void afterPropertiesSet()
                        throws Exception
InitializingBeanBeanFactory after it has set all bean properties
 and satisfied BeanFactoryAware, ApplicationContextAware etc.
 This method allows the bean instance to perform validation of its overall configuration and final initialization when all bean properties have been set.
afterPropertiesSet in interface InitializingBeanafterPropertiesSet in class MethodInvokingBeanException - in the event of misconfiguration (such as failure to set an
 essential property) or if initialization fails for any other reason@Nullable public Object getObject() throws Exception
getObject in interface FactoryBean<Object>null)Exception - in case of creation errorsFactoryBeanNotInitializedExceptionpublic Class<?> getObjectType()
null if not known in advance.getObjectType in interface FactoryBean<Object>null if not known at the time of the callListableBeanFactory.getBeansOfType(java.lang.Class<T>)public boolean isSingleton()
FactoryBeanFactoryBean.getObject() always return the same object
 (a reference that can be cached)?
 NOTE: If a FactoryBean indicates to hold a singleton object,
 the object returned from getObject() might get cached
 by the owning BeanFactory. Hence, do not return true
 unless the FactoryBean always exposes the same reference.
 
The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.
NOTE: This method returning false does not
 necessarily indicate that returned objects are independent instances.
 An implementation of the extended SmartFactoryBean interface
 may explicitly indicate independent instances through its
 SmartFactoryBean.isPrototype() method. Plain FactoryBean
 implementations which do not implement this extended interface are
 simply assumed to always return independent instances if the
 isSingleton() implementation returns false.
 
The default implementation returns true, since a
 FactoryBean typically manages a singleton instance.
isSingleton in interface FactoryBean<Object>FactoryBean.getObject(), 
SmartFactoryBean.isPrototype()