Annotation 주입은 이름에서 알 수 있듯이 Annotation을 통해 주입을 수행하는 것입니다. Spring 및 주입과 관련된 일반적인 주석에는 Autowired, Resource, Qualifier, Service, Controller, Repository 및 Component가 있습니다.
Autowired는 자동 주입으로, 주입할 스프링 컨텍스트에서 적절한 Bean을 자동으로 찾습니다.
리소스는 주입할 이름을 지정하는 데 사용됩니다.
한정자 Autowired 협력을 사용하여 클래스를 서비스 계층 클래스, 컨트롤러 계층 클래스 및 데이터 저장 계층 클래스로 각각 표시하려면 빈
서비스, 컨트롤러, 저장소의 이름을 지정합니다. 스프링이 주석 구성을 스캔하면 이를 표시합니다. 빈을 생성하는 클래스.
Component는 일반적인 용어입니다. 표시된 클래스는 Spring이 주석 구성을 스캔할 때 이러한 클래스를 표시하여 Bean을 생성합니다.
Spring은 Bean 종속성 주입을 위한 여러 주석 방법을 지원합니다.
@Resource javax.annotation JSR250 (Common Annotations for Java) @Inject javax.inject JSR330 (Dependency Injection for Java) @Autowired org.springframework.bean.factory Spring
직관적으로 @Autowired는 Spring에서 제공하는 주석이고 다른 것들도 Spring에서 내장된 주석을 지원합니다. JDK 자체의 주석에 있습니다. 그런데 이 세 가지의 사용상의 차이점은 무엇입니까? 저자는 방법을 테스트한 후 몇 가지 흥미로운 특징을 발견했습니다.
차이점을 요약하면 다음과 같습니다.
1. @Autowired에는 false로 구성할 수 있는 필수 속성이 있습니다. 이 경우 해당 Bean을 찾을 수 없으면 예외가 발생합니다. 던져지지 마십시오. @Inject 및 @Resource는 해당 구성을 제공하지 않으므로 이를 찾아야 합니다. 그렇지 않으면 예외가 발생합니다.
2. @Autowired와 @Inject는 둘 다 AutowiredAnnotationBeanPostProcessor를 사용하여 종속성 주입을 처리하기 때문에 기본적으로 동일합니다. 그러나 @Resource는 예외이며 CommonAnnotationBeanPostProcessor를 사용하여 종속성 주입을 처리합니다. 물론 둘 다 BeanPostProcessors입니다.
@Autowired和@Inject - 默认 autowired by type - 可以 通过@Qualifier 显式指定 autowired by qualifier name。 - 如果 autowired by type 失败（找不到或者找到多个实现），则退化为autowired by field name @Resource - 默认 autowired by field name - 如果 autowired by field name失败，会退化为 autowired by type - 可以 通过@Qualifier 显式指定 autowired by qualifier name - 如果 autowired by qualifier name失败，会退化为 autowired by field name。但是这时候如果 autowired by field name失败，就不会再退化为autowired by type了。
TIPS 정규명 VS Bean 이름
Spring 디자인에서 정규명은 Bean 이름과 동일하지 않습니다. 후자는 고유해야 하지만 전자는 유사합니다. 태그나 그룹의 기능은 특정 빈을 분류하는 것입니다. getByTag(group)의 효과를 얻을 수 있습니다. XML로 구성된 Bean의 경우 id 속성을 통해 Bean 이름을 지정할 수 있으며(지정하지 않은 경우 클래스 이름의 첫 글자는 기본적으로 소문자임) 레이블을 통해 한정자 이름을 지정할 수 있습니다:
<bean id="lamborghini" class="me.arganzheng.study.spring.autowired.Lamborghini"> <qualifier value="luxury"/> <!-- inject any dependencies required by this bean --> </bean>
주석 메서드를 사용하는 경우 @Qualifier 주석을 통해 한정자 이름을 지정하고 @Named 또는 @Component(@Service, @Repository 등) 값을 통해 Bean 이름을 지정할 수 있습니다.
@Component("lamborghini")
@Qualifier("luxury")
public class Lamborghini implements Car {
}또는
@Component
@Named("lamborghini")
@Qualifier("luxury")
public class Lamborghini implements Car {
}마찬가지로 빈 이름이 지정되지 않으면 Spring은 기본적으로 클래스 이름의 첫 글자를 소문자로 설정합니다(Lamborghini =>람보르기니).
3. XML 주입 전에 Annotation을 통해 종속성을 주입합니다. 두 주입 방법이 동일한 Bean에 대한 종속성에 사용되는 경우 XML 주입 방법이 우선합니다. 그러나 XML로 구성된 Bean에는 Anotation을 통해 주입된 종속성을 주입할 수 없다고 걱정할 필요는 없습니다.
4. 현재 유형별 자동 연결 방식(저자는 3.2.3.RELEASE 버전을 사용 중임), Spring의 AutowiredAnnotationBeanPostProcessor 구현에는 모두 "버그"가 있습니다. 즉, @Autowired와 @Inject 모두 "버그"가 있습니다. 버그" 버그입니다(고의적인 것 같아서 버그가 아니라 버그라고 부르는데...). 이는 온라인에서 발생한 버그이며, 이 글을 작성하게 된 이유이기도 합니다. 장면은 다음과 같습니다.
application-context.xml에는 다음과 같은 정의가 있습니다.
<xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd"> <context:annotation-config /> <context:component-scan base-package="me.arganzheng.study" /> <util:constant id="en" static-field="me.arganzheng.study.spring.autowired.Constants.Language.EN" /> <util:constant id="ja" static-field="me.arganzheng.study.spring.autowired.Constants.Language.JP" /> <util:constant id="ind" static-field="me.arganzheng.study.spring.autowired.Constants.Language.IND" /> <util:constant id="pt" static-field="me.arganzheng.study.spring.autowired.Constants.Language.PT" /> <util:constant id="th" static-field="me.arganzheng.study.spring.autowired.Constants.Language.TH" /> <util:constant id="ar" static-field="me.arganzheng.study.spring.autowired.Constants.Language.AR" /> <util:constant id="en-rIn" static-field="me.arganzheng.study.spring.autowired.Constants.Language.EN_RIN" /> <util:map id="languageChangesMap" key-type="java.lang.String" value-type="java.lang.String"> <entry key="pt" value="pt" /> <entry key="br" value="pt" /> <entry key="jp" value="ja" /> <entry key="ja" value="ja" /> <entry key="ind" value="ind" /> <entry key="id" value="ind" /> <entry key="en-rin" value="en-rIn" /> <entry key="in" value="en-rIn" /> <entry key="en" value="en" /> <entry key="gb" value="en" /> <entry key="th" value="th" /> <entry key="ar" value="ar" /> <entry key="eg" value="ar" /> </util:map> </beans>
static-field에 의해 적용되는 상수는 다음 클래스에 정의됩니다. 🎜>
package me.arganzheng.study.spring.autowired;
public interface Constants {
public interface Language {
public static final String EN = "CommonConstants.LANG_ENGLISH";
public static final String JP = "CommonConstants.LANG_JAPANESE";
public static final String IND = "CommonConstants.LANG_INDONESIAN";
public static final String PT = "CommonConstants.LANG_PORTUGUESE";
public static final String TH = "CommonConstants.LANG_THAI";
public static final String EN_RIN = "CommonConstants.LANG_ENGLISH_INDIA";
public static final String AR = "CommonConstants.LANG_Arabic";
}
}public class AutowiredTest extends BaseSpringTestCase {
@Autowired
private Map<String, String> languageChangesMap;
@Test
public void testAutowired() {
notNull(languageChangesMap);
System.out.println(languageChangesMap.getClass().getSimpleName());
System.out.println(languageChangesMap);
}
}LinkedHashMap
{en=CommonConstants.LANG_ENGLISH, ja=CommonConstants.LANG_JAPANESE, ind=CommonConstants.LANG_INDONESIAN, pt=CommonConstants.LANG_PORTUGUESE, th=CommonConstants.LANG_THAI, ar=CommonConstants.LANG_Arabic, en-rIn=CommonConstants.LANG_ENGLISH_INDIA}[org.springframework.test.context.support.DependencyInjectionTestExecutionListener@5c51ee0a] to prepare test instance [me.arganzheng.study.spring.autowired.AutowiredTest@6e301e0]
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'me.arganzheng.study.spring.autowired.AutowiredTest': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map me.arganzheng.study.spring.autowired.AutowiredTest.languageChangesMap; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [java.lang.String] found for dependency [map with value type java.lang.String]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
...
ed by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [java.lang.String] found for dependency [map with value type java.lang.String]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:986)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:843)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:768)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:486)
... 28 more디버그해 보니 확실히 Spring 버그인 걸 발견했습니다. DefaultListableBeanFactory에 이 메서드에 문제가 있습니다.
protected Object doResolveDependency(DependencyDescriptor descriptor, Class<?> type, String beanName,
Set<String> autowiredBeanNames, TypeConverter typeConverter) throws BeansException {
...
else if (Map.class.isAssignableFrom(type) && type.isInterface()) {
Class<?> keyType = descriptor.getMapKeyType();
if (keyType == null || !String.class.isAssignableFrom(keyType)) {
if (descriptor.isRequired()) {
throw new FatalBeanException("Key type [" + keyType + "] of map [" + type.getName() +
"] must be assignable to [java.lang.String]");
}
return null;
}
Class<?> valueType = descriptor.getMapValueType();
if (valueType == null) {
if (descriptor.isRequired()) {
throw new FatalBeanException("No value type declared for map [" + type.getName() + "]");
}
return null;
}
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, valueType, descriptor);
if (matchingBeans.isEmpty()) {
if (descriptor.isRequired()) {
raiseNoSuchBeanDefinitionException(valueType, "map with value type " + valueType.getName(), descriptor);
}
return null;
}
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
return matchingBeans;
}
...
}[org.springframework.test.context.support.DependencyInjectionTestExecutionListener@9476189] to prepare test instance [me.arganzheng.study.spring.autowired.AutowiredTest@2d546e21]
...
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [java.lang.String] found for dependency [map with value type java.lang.String]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value=languageChangesMap)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:986)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:843)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:768)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:486)
... 28 moreprotected Object doResolveDependency(DependencyDescriptor descriptor, Class<?> type, String beanName,
Set<String> autowiredBeanNames, TypeConverter typeConverter) throws BeansException {
Object value = getAutowireCandidateResolver().getSuggestedValue(descriptor);
if (value != null) {
if (value instanceof String) {
String strVal = resolveEmbeddedValue((String) value);
BeanDefinition bd = (beanName != null && containsBean(beanName) ? getMergedBeanDefinition(beanName) : null);
value = evaluateBeanDefinitionString(strVal, bd);
}
TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
return (descriptor.getField() != null ?
converter.convertIfNecessary(value, type, descriptor.getField()) :
converter.convertIfNecessary(value, type, descriptor.getMethodParameter()));
}
if (type.isArray()) {
Class<?> componentType = type.getComponentType();
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, componentType, descriptor);
if (matchingBeans.isEmpty()) {
if (descriptor.isRequired()) {
raiseNoSuchBeanDefinitionException(componentType, "array of " + componentType.getName(), descriptor);
}
return null;
}
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
return converter.convertIfNecessary(matchingBeans.values(), type);
}
else if (Collection.class.isAssignableFrom(type) && type.isInterface()) {
Class<?> elementType = descriptor.getCollectionType();
if (elementType == null) {
if (descriptor.isRequired()) {
throw new FatalBeanException("No element type declared for collection [" + type.getName() + "]");
}
return null;
}
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, elementType, descriptor);
if (matchingBeans.isEmpty()) {
if (descriptor.isRequired()) {
raiseNoSuchBeanDefinitionException(elementType, "collection of " + elementType.getName(), descriptor);
}
return null;
}
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
return converter.convertIfNecessary(matchingBeans.values(), type);
}
else if (Map.class.isAssignableFrom(type) && type.isInterface()) {
Class<?> keyType = descriptor.getMapKeyType();
if (keyType == null || !String.class.isAssignableFrom(keyType)) {
if (descriptor.isRequired()) {
throw new FatalBeanException("Key type [" + keyType + "] of map [" + type.getName() +
"] must be assignable to [java.lang.String]");
}
return null;
}
Class<?> valueType = descriptor.getMapValueType();
if (valueType == null) {
if (descriptor.isRequired()) {
throw new FatalBeanException("No value type declared for map [" + type.getName() + "]");
}
return null;
}
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, valueType, descriptor);
if (matchingBeans.isEmpty()) {
if (descriptor.isRequired()) {
raiseNoSuchBeanDefinitionException(valueType, "map with value type " + valueType.getName(), descriptor);
}
return null;
}
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
return matchingBeans;
}
else {
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, type, descriptor);
if (matchingBeans.isEmpty()) {
if (descriptor.isRequired()) {
raiseNoSuchBeanDefinitionException(type, "", descriptor);
}
return null;
}
if (matchingBeans.size() > 1) {
String primaryBeanName = determinePrimaryCandidate(matchingBeans, descriptor);
if (primaryBeanName == null) {
throw new NoUniqueBeanDefinitionException(type, matchingBeans.keySet());
}
if (autowiredBeanNames != null) {
autowiredBeanNames.add(primaryBeanName);
}
return matchingBeans.get(primaryBeanName);
}
// We have exactly one match.
Map.Entry<String, Object> entry = matchingBeans.entrySet().iterator().next();
if (autowiredBeanNames != null) {
autowiredBeanNames.add(entry.getKey());
}
return entry.getValue();
}
}private List
org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [me.arganzheng.study.spring.autowired.Car] is defined: expected single matching bean but found 2: [audi, toyota].
public class AutowiredTest extends BaseSpringTestCase {
@Resource
@Qualifier("languageChangesMap")
private Map<String, String> languageChangesMap;
@Test
public void testAutowired() {
assertNotNull(languageChangesMap);
System.out.println(languageChangesMap.getClass().getSimpleName());
System.out.println(languageChangesMap);
}
}LinkedHashMap
{pt=pt, br=pt, jp=ja, ja=ja, ind=ind, id=ind, en-rin=en-rIn, in=en-rIn, en=en, gb=en, th=th, ar=ar, eg=ar}Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [java.lang.String] found for dependency [map with value type java.lang.String]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER, lookup=)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:986)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:843)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:768)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:438)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:416)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:550)
at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:150)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:303)
... 26 morepublic class AutowiredTest extends BaseSpringTestCase {
@Resource
@Qualifier("languageChangesMap")
private Map<String, String> languageChangesMap;
@Resource
private List<Car> cars;
@Test
public void testAutowired() {
assertNotNull(languageChangesMap);
System.out.println(languageChangesMap.getClass().getSimpleName());
System.out.println(languageChangesMap);
assertNotNull(cars);
System.out.println(cars.getClass().getSimpleName());
System.out.println(cars);
}
}LinkedHashMap
{pt=pt, br=pt, jp=ja, ja=ja, ind=ind, id=ind, en-rin=en-rIn, in=en-rIn, en=en, gb=en, th=th, ar=ar, eg=ar}
ArrayList[me.arganzheng.study.spring.autowired.Audi@579584da, me.arganzheng.study.spring.autowired.Toyota@19453122]
这是因为@Resource注解使用的是CommonAnnotationBeanPostProcessor处理器，跟 AutowiredAnnotationBeanPostProcessor不是同一个作者[/偷笑]。这里就不分析了，感兴趣的同学可以自己看代码研究 一下。
最终结论如下：
1、@Autowired和@Inject
autowired by type 可以 通过@Qualifier 显式指定 autowired by qualifier name（非集合类。注意：不是autowired by bean name！）
如果 autowired by type 失败（找不到或者找到多个实现），则退化为autowired by field name（非集合类）
2、@Resource
默认 autowired by field name
如果 autowired by field name失败，会退化为 autowired by type
可以 通过@Qualifier 显式指定 autowired by qualifier name
如果 autowired by qualifier name失败，会退化为 autowired by field name。但是这时候如果 autowired by field name失败，就不会再退化为autowired by type了
测试工程保存在GitHub上，是标准的maven工程，感兴趣的同学可以clone到本地运行测试一下。
补充
有同事指出Spring官方文档上有这么一句话跟我的结有点冲突：
However, although you can use this convention to refer to specific beans by name, @Autowired is fundamentally about type-driven injection with optional semantic qualifiers. This means that qualifier values, even with the bean name fallback, always have narrowing semantics within the set of type matches; they do not semantically express a reference to a unique bean id.
也就是说@Autowired即使加了@Qualifier注解，其实也是autowired by type。@Qualifier只是一个限定词，过滤条件而已。重新跟进了一下代码，发现确实是这样子的。Spring设计的这个 @Qualifier name 并不等同于 bean name。他有点类似于一个tag。不过如果这个tag是唯一的化，那么其实效果上等同于bean name。实现上，Spring是先getByType，得到list candicates，然后再根据qualifier name进行过滤。
再定义一个兰博基尼，这里使用@Qualifier指定：
package me.arganzheng.study.spring.autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
@Component
@Qualifier("luxury")
public class Lamborghini implements Car {
}再定义一个劳斯莱斯，这里故意用@Named指定：
package me.arganzheng.study.spring.autowired;
import javax.inject.Named;
import org.springframework.stereotype.Component;
@Component
@Named("luxury")
public class RollsRoyce implements Car {
}测试一下注入定义的豪华车：
package me.arganzheng.study.spring.autowired;
import static junit.framework.Assert.assertNotNull;
import java.util.List;
import me.arganzheng.study.BaseSpringTestCase;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
/**
*
* @author zhengzhibin
*
*/
public class AutowiredTest extends BaseSpringTestCase {
@Autowired
@Qualifier("luxury")
private List<Car> luxuryCars;
@Test
public void testAutowired() {
assertNotNull(luxuryCars);
System.out.println(luxuryCars.getClass().getSimpleName());
System.out.println(luxuryCars);
}
}运行结果如下：
ArrayList [me.arganzheng.study.spring.autowired.Lamborghini@66b875e1, me.arganzheng.study.spring.autowired.RollsRoyce@58433b76]
补充：Autowiring modes
Spring支持四种autowire模式，当使用XML配置方式时，你可以通过autowire属性指定。
no. (Default) No autowiring. Bean references must be defined via a ref element. Changing the default setting is not recommended for larger deployments, because specifying collaborators explicitly gives greater control and clarity. To some extent, it documents the structure of a system. byName. Autowiring by property name. Spring looks for a bean with the same name as the property that needs to be autowired. For example, if a bean definition is set to autowire by name, and it contains a master property (that is, it has a setMaster(..) method), Spring looks for a bean definition named master, and uses it to set the property. byType. Allows a property to be autowired if exactly one bean of the property type exists in the container. If more than one exists, a fatal exception is thrown, which indicates that you may not use byType autowiring for that bean. If there are no matching beans, nothing happens; the property is not set. constructor. Analogous to byType, but applies to constructor arguments. If there is not exactly one bean of the constructor argument type in the container, a fatal error is raised.
如果使用@Autowired、@Inject或者@Resource注解的时候，则稍微复杂一些，会有一个失败退化过程，并且引入了Qualifier。不过基本原理是一样。
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