org.springframework.beans.factory.annotation

类 AutowiredAnnotationBeanPostProcessor

java.lang.Object

org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter

org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor

所有已实现的接口:

org.springframework.beans.factory.Aware, org.springframework.beans.factory.BeanFactoryAware, org.springframework.beans.factory.config.BeanPostProcessor, org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor, org.springframework.beans.factory.config.SmartInstantiationAwareBeanPostProcessor, org.springframework.beans.factory.support.MergedBeanDefinitionPostProcessor, org.springframework.core.Ordered, org.springframework.core.PriorityOrdered

public class AutowiredAnnotationBeanPostProcessor
extends org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter
implements org.springframework.beans.factory.support.MergedBeanDefinitionPostProcessor, org.springframework.core.PriorityOrdered, org.springframework.beans.factory.BeanFactoryAware

BeanPostProcessor implementation that autowires annotated fields, setter methods and arbitrary config methods. Such members to be injected are detected through a Java 5 annotation: by default, Spring's @Autowired and @Value annotations.

Also supports JSR-330's @Inject annotation, if available, as a direct alternative to Spring's own @Autowired.

Only one constructor (at max) of any given bean class may declare this annotation with the 'required' parameter set to true, indicating the constructor to autowire when used as a Spring bean. If multiple non-required constructors declare the annotation, they will be considered as candidates for autowiring. The constructor with the greatest number of dependencies that can be satisfied by matching beans in the Spring container will be chosen. If none of the candidates can be satisfied, then a standard default constructor (if present) will be used. If a class only declares a single constructor to begin with, it will always be used, even if not annotated. An annotated constructor does not have to be public.

Fields are injected right after construction of a bean, before any config methods are invoked. Such a config field does not have to be public.

Config methods may have an arbitrary name and any number of arguments; each of those arguments will be autowired with a matching bean in the Spring container. Bean property setter methods are effectively just a special case of such a general config method. Config methods do not have to be public.

Note: A default AutowiredAnnotationBeanPostProcessor will be registered by the "context:annotation-config" and "context:component-scan" XML tags. Remove or turn off the default annotation configuration there if you intend to specify a custom AutowiredAnnotationBeanPostProcessor bean definition.

NOTE: Annotation injection will be performed before XML injection; thus the latter configuration will override the former for properties wired through both approaches.

In addition to regular injection points as discussed above, this post-processor also handles Spring's @Lookup annotation which identifies lookup methods to be replaced by the container at runtime. This is essentially a type-safe version of getBean(Class, args) and getBean(String, args), See @Lookup's javadoc for details.

从以下版本开始:

2.5

另请参阅:

setAutowiredAnnotationType(java.lang.Class<? extends java.lang.annotation.Annotation>), Autowired, Value

字段概要

字段

限定符和类型	字段和说明
protected org.apache.commons.logging.Log	logger

从接口继承的字段 org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

构造器概要

构造器

构造器和说明
AutowiredAnnotationBeanPostProcessor() Create a new AutowiredAnnotationBeanPostProcessor for Spring's standard Autowired annotation.

方法概要

限定符和类型	方法和说明
java.lang.reflect.Constructor<?>[]	determineCandidateConstructors(java.lang.Class<?> beanClass, java.lang.String beanName)
protected boolean	determineRequiredStatus(org.springframework.core.annotation.AnnotationAttributes ann) Determine if the annotated field or method requires its dependency.
protected <T> java.util.Map<java.lang.String,T>	findAutowireCandidates(java.lang.Class<T> type) Obtain all beans of the given type as autowire candidates.
int	getOrder()
void	postProcessMergedBeanDefinition(org.springframework.beans.factory.support.RootBeanDefinition beanDefinition, java.lang.Class<?> beanType, java.lang.String beanName)
org.springframework.beans.PropertyValues	postProcessPropertyValues(org.springframework.beans.PropertyValues pvs, java.beans.PropertyDescriptor[] pds, java.lang.Object bean, java.lang.String beanName)
void	processInjection(java.lang.Object bean) 'Native' processing method for direct calls with an arbitrary target instance, resolving all of its fields and methods which are annotated with @Autowired.
void	setAutowiredAnnotationType(java.lang.Class<? extends java.lang.annotation.Annotation> autowiredAnnotationType) Set the 'autowired' annotation type, to be used on constructors, fields, setter methods and arbitrary config methods.
void	setAutowiredAnnotationTypes(java.util.Set<java.lang.Class<? extends java.lang.annotation.Annotation>> autowiredAnnotationTypes) Set the 'autowired' annotation types, to be used on constructors, fields, setter methods and arbitrary config methods.
void	setBeanFactory(org.springframework.beans.factory.BeanFactory beanFactory)
void	setOrder(int order)
void	setRequiredParameterName(java.lang.String requiredParameterName) Set the name of a parameter of the annotation that specifies whether it is required.
void	setRequiredParameterValue(boolean requiredParameterValue) Set the boolean value that marks a dependency as required For example if using 'required=true' (the default), this value should be true; but if using 'optional=false', this value should be false.

从类继承的方法 org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter

getEarlyBeanReference, postProcessAfterInitialization, postProcessAfterInstantiation, postProcessBeforeInitialization, postProcessBeforeInstantiation, predictBeanType

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 org.springframework.beans.factory.config.BeanPostProcessor

postProcessAfterInitialization, postProcessBeforeInitialization

字段详细资料

logger

protected final org.apache.commons.logging.Log logger

构造器详细资料

AutowiredAnnotationBeanPostProcessor

public AutowiredAnnotationBeanPostProcessor()

Create a new AutowiredAnnotationBeanPostProcessor for Spring's standard Autowired annotation.

Also supports JSR-330's Inject annotation, if available.

方法详细资料

setAutowiredAnnotationType

public void setAutowiredAnnotationType(java.lang.Class<? extends java.lang.annotation.Annotation> autowiredAnnotationType)

Set the 'autowired' annotation type, to be used on constructors, fields, setter methods and arbitrary config methods.

The default autowired annotation type is the Spring-provided Autowired annotation, as well as Value.

This setter property exists so that developers can provide their own (non-Spring-specific) annotation type to indicate that a member is supposed to be autowired.

setAutowiredAnnotationTypes

public void setAutowiredAnnotationTypes(java.util.Set<java.lang.Class<? extends java.lang.annotation.Annotation>> autowiredAnnotationTypes)

Set the 'autowired' annotation types, to be used on constructors, fields, setter methods and arbitrary config methods.

The default autowired annotation type is the Spring-provided Autowired annotation, as well as Value.

This setter property exists so that developers can provide their own (non-Spring-specific) annotation types to indicate that a member is supposed to be autowired.

setRequiredParameterName

public void setRequiredParameterName(java.lang.String requiredParameterName)

Set the name of a parameter of the annotation that specifies whether it is required.

另请参阅:

setRequiredParameterValue(boolean)

setRequiredParameterValue

public void setRequiredParameterValue(boolean requiredParameterValue)

Set the boolean value that marks a dependency as required

For example if using 'required=true' (the default), this value should be true; but if using 'optional=false', this value should be false.

另请参阅:

setRequiredParameterName(String)

setOrder

public void setOrder(int order)

getOrder

public int getOrder()

指定者:

getOrder 在接口中 org.springframework.core.Ordered

setBeanFactory

public void setBeanFactory(org.springframework.beans.factory.BeanFactory beanFactory)

指定者:

setBeanFactory 在接口中 org.springframework.beans.factory.BeanFactoryAware

postProcessMergedBeanDefinition

public void postProcessMergedBeanDefinition(org.springframework.beans.factory.support.RootBeanDefinition beanDefinition,
                                            java.lang.Class<?> beanType,
                                            java.lang.String beanName)

指定者:

postProcessMergedBeanDefinition 在接口中 org.springframework.beans.factory.support.MergedBeanDefinitionPostProcessor

determineCandidateConstructors

public java.lang.reflect.Constructor<?>[] determineCandidateConstructors(java.lang.Class<?> beanClass,
                                                                         java.lang.String beanName)
                                                                  throws org.springframework.beans.factory.BeanCreationException

指定者:

determineCandidateConstructors 在接口中 org.springframework.beans.factory.config.SmartInstantiationAwareBeanPostProcessor

覆盖:

determineCandidateConstructors 在类中 org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter

抛出:

org.springframework.beans.factory.BeanCreationException

postProcessPropertyValues

public org.springframework.beans.PropertyValues postProcessPropertyValues(org.springframework.beans.PropertyValues pvs,
                                                                          java.beans.PropertyDescriptor[] pds,
                                                                          java.lang.Object bean,
                                                                          java.lang.String beanName)
                                                                   throws org.springframework.beans.factory.BeanCreationException

指定者:

postProcessPropertyValues 在接口中 org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor

覆盖:

postProcessPropertyValues 在类中 org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter

抛出:

org.springframework.beans.factory.BeanCreationException

processInjection

public void processInjection(java.lang.Object bean)
                      throws org.springframework.beans.factory.BeanCreationException

'Native' processing method for direct calls with an arbitrary target instance, resolving all of its fields and methods which are annotated with @Autowired.

参数:

bean - the target instance to process

抛出:

org.springframework.beans.factory.BeanCreationException - if autowiring failed

determineRequiredStatus

protected boolean determineRequiredStatus(org.springframework.core.annotation.AnnotationAttributes ann)

Determine if the annotated field or method requires its dependency.

A 'required' dependency means that autowiring should fail when no beans are found. Otherwise, the autowiring process will simply bypass the field or method when no beans are found.

参数:

ann - the Autowired annotation

返回:

whether the annotation indicates that a dependency is required

findAutowireCandidates

protected <T> java.util.Map<java.lang.String,T> findAutowireCandidates(java.lang.Class<T> type)
                                                                throws org.springframework.beans.BeansException

Obtain all beans of the given type as autowire candidates.

参数:

type - the type of the bean

返回:

the target beans, or an empty Collection if no bean of this type is found

抛出:

org.springframework.beans.BeansException - if bean retrieval failed