springboot如何实现自动装配源码解读
SpringBoot自动装配
最重要的注解@SpringBootApplication
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(excludeFilters={@Filter(type=FilterType.CUSTOM,classes=TypeExcludeFilter.class),
@Filter(type=FilterType.CUSTOM,classes=AutoConfigurationExcludeFilter.class)})
public@interfaceSpringBootApplication{
@AliasFor(annotation=EnableAutoConfiguration.class)
Class[]exclude()default{};
@AliasFor(annotation=EnableAutoConfiguration.class)
String[]excludeName()default{};
@AliasFor(annotation=ComponentScan.class,attribute="basePackages")
String[]scanBasePackages()default{};
@AliasFor(annotation=ComponentScan.class,attribute="basePackageClasses")
Class[]scanBasePackageClasses()default{};
@AliasFor(annotation=Configuration.class)
booleanproxyBeanMethods()defaulttrue;
}
EnableAutoConfiguration
是实现自动装配的核心注解
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@AutoConfigurationPackage
@Import(AutoConfigurationImportSelector.class)
public@interfaceEnableAutoConfiguration{
}
getAutoConfigurationMetadata()
@Override
publicvoidprocess(AnnotationMetadataannotationMetadata,DeferredImportSelectordeferredImportSelector){
Assert.state(deferredImportSelectorinstanceofAutoConfigurationImportSelector,
()->String.format("Only%simplementationsaresupported,got%s",
AutoConfigurationImportSelector.class.getSimpleName(),
deferredImportSelector.getClass().getName()));
AutoConfigurationEntryautoConfigurationEntry=((AutoConfigurationImportSelector)deferredImportSelector)
.getAutoConfigurationEntry(
//加载配置元数据
getAutoConfigurationMetadata(),annotationMetadata);
this.autoConfigurationEntries.add(autoConfigurationEntry);
for(StringimportClassName:autoConfigurationEntry.getConfigurations()){
this.entries.putIfAbsent(importClassName,annotationMetadata);
}
}
privateAutoConfigurationMetadatagetAutoConfigurationMetadata(){
if(this.autoConfigurationMetadata==null){
//加载配置信息
this.autoConfigurationMetadata=AutoConfigurationMetadataLoader.loadMetadata(this.beanClassLoader);
}
returnthis.autoConfigurationMetadata;
}
staticAutoConfigurationMetadataloadMetadata(ClassLoaderclassLoader,Stringpath){
try{
//获取资源路径
Enumerationurls=(classLoader!=null)?classLoader.getResources(path)
:ClassLoader.getSystemResources(path);
Propertiesproperties=newProperties();
while(urls.hasMoreElements()){
properties.putAll(PropertiesLoaderUtils.loadProperties(newUrlResource(urls.nextElement())));
}
returnloadMetadata(properties);
}
catch(IOExceptionex){
thrownewIllegalArgumentException("Unabletoload@ConditionalOnClasslocation["+path+"]",ex);
}
}
protectedstaticfinalStringPATH="META-INF/spring-autoconfigure-metadata.properties";
注意：这个文件在target编译后的文件夹中
自动装配
spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/spring.factories
该文件内存有:
AutoConfigure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\ org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\ org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\ org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\ org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\ org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\
EnableConfigurationProperties
@ConfigurationProperties(prefix="spring.redis")
publicclassRedisProperties{
/**
*Databaseindexusedbytheconnectionfactory.
*/
privateintdatabase=0;
/**
*ConnectionURL.Overrideshost,port,andpassword.Userisignored.Example:
*redis://user:password@example.com:6379
*/
privateStringurl;
/**
*Redisserverhost.
*/
privateStringhost="localhost";
/**
*Loginpasswordoftheredisserver.
*/
privateStringpassword;
/**
*Redisserverport.
*/
privateintport=6379;
/**
*WhethertoenableSSLsupport.
*/
privatebooleanssl;
/**
*Connectiontimeout.
*/
privateDurationtimeout;
/**
*ClientnametobesetonconnectionswithCLIENTSETNAME.
*/
privateStringclientName;
}
希望通过本篇对于springboot自动装配的解读，让大家对springboot底层有了一个大致了解，只分析了主要方法，希望对大家有帮助
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