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ServletContextFactoryBean (Spring Framework) - Spring Framework 1.2.9 API 文档英文版

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org.springframework.web.context.support
Class ServletContextFactoryBean

java.lang.Object
  org.springframework.web.context.support.ServletContextFactoryBean

All Implemented Interfaces:

FactoryBean, ServletContextAware

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public class ServletContextFactoryBean
extends Object
implements FactoryBean, ServletContextAware

Simple FactoryBean that exposes the ServletContext for bean references. Can be used as alternative to implementing ServletContextAware, allowing to pass in the ServletContext to a constructor argument or any custom bean property.

Note that there's a special FactoryBean for exposing a specific ServletContext attribute, named ServletContextAttributeFactoryBean. So if all you need from the ServletContext is access to a specific attribute, ServletContextAttributeFactoryBean allows you to expose a constructor argument or bean property of the attribute type, which is a preferable to a dependency on the full ServletContext.

Since:

1.1.4

Author:

Juergen Hoeller

See Also:

ServletContext, ServletContextAware, ServletContextAttributeFactoryBean

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Constructor Summary
ServletContextFactoryBean()

 

Method Summary
Object	getObject()           Return an instance (possibly shared or independent) of the object managed by this factory.
Class	getObjectType()           Return the type of object that this FactoryBean creates, or null if not known in advance.
boolean	isSingleton()           Is the bean managed by this factory a singleton or a prototype?
void	setServletContext(ServletContext servletContext)           Set the ServletContext that this object runs in.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

ServletContextFactoryBean

public ServletContextFactoryBean()

Method Detail

setServletContext

public void setServletContext(ServletContext servletContext)

Description copied from interface: ServletContextAware

Set the ServletContext that this object runs in.

Invoked after population of normal bean properties but before an init callback like InitializingBean's afterPropertiesSet or a custom init-method. Invoked after ApplicationContextAware's setApplicationContext.

Specified by:

setServletContext in interface ServletContextAware

Parameters:

servletContext - ServletContext object to be used by this object

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getObject

public Object getObject()

Description copied from interface: FactoryBean

Return an instance (possibly shared or independent) of the object managed by this factory. As with a BeanFactory, this allows support for both the Singleton and Prototype design pattern.

If this method returns null, the factory will consider the FactoryBean as not fully initialized and throw a corresponding FactoryBeanNotInitializedException.

Specified by:

getObject in interface FactoryBean

Returns:

an instance of the bean (should not be null; a null value will be considered as an indication of incomplete initialization)

See Also:

FactoryBeanNotInitializedException

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getObjectType

public Class getObjectType()

Description copied from interface: FactoryBean

Return the type of object that this FactoryBean creates, or null if not known in advance. This allows to check for specific types of beans without instantiating objects, for example on autowiring.

For a singleton, this should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

NOTE: Autowiring will simply ignore FactoryBeans that return null here. Therefore it is highly recommended to implement this method properly, using the current state of the FactoryBean.

Specified by:

getObjectType in interface FactoryBean

Returns:

the type of object that this FactoryBean creates, or null if not known at the time of the call

See Also:

ListableBeanFactory.getBeansOfType(java.lang.Class)

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isSingleton

public boolean isSingleton()

Description copied from interface: FactoryBean

Is the bean managed by this factory a singleton or a prototype? That is, will 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.

Specified by:

isSingleton in interface FactoryBean

Returns:

if this bean is a singleton

See Also:

FactoryBean.getObject()

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