SpringBoot教学篇------SpringBoot自动配置原理

ゝ一世哀愁。 2023-10-13 20:14 28阅读 0赞

#### 一、SpringBoot自动配置的注解@AutoWired ####

SpringBoot的自动配置就是当Spring容器启动后，一些自动配置类（只是自动配置类，并不是当前的组件配置到IOC容器中，自动配置类通过@Conditional注解来按需配置）就自动装配的IOC容器中，不需要我们手动注入，从而简化了开发，省去繁琐的配置。

可以在Application.properties中增加的属性值

[Common Application Properties][]

#### 二、SpringBoot的自动配置原理 ####

一个SpringBoot工程如果想运行成功，就必须有一个主程序类（被@SpringBootApplication注解标识），而自动配置的相关工作就在@SpringBootApplication这个注解上。

![e237187b9e59ed5bce30974e1225ee5d.png][]

当我们进入@SpringBootApplication注解的源码当中，可以发现它是一个复合注解，它由**@SpringBootConfiguration**、**@EnableAutoConfiguration**、**@ComponentScan**这三个注解组成。

![a39f6d601f0fa1d769e14c9ae7714666.png][]

**1、@SpringBootConfiguration**

在@SpringBootConfiguration源码中可以发现有@Configuration，代表一个配置类，说明主程序类也是一个配置类。

**2、@ComponentScan**

指定扫描哪些组件，默认是扫描主程序所在的包以及其子包。

**3、@EnableAutoConfiguration**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 </td> 
 <td> <code>@Target</code><code>(ElementType.TYPE)</code> <code>@Retention</code><code>(RetentionPolicy.RUNTIME)</code> <code>@Documented</code> <code>@Inherited</code> <code>@AutoConfigurationPackage</code> <code>@Import</code><code>(AutoConfigurationImportSelector.</code><code>class</code><code>)</code> <code>public</code>&nbsp;<code>@interface</code>&nbsp;<code>EnableAutoConfiguration {&lt;br&gt;}</code> </td> 
 </tr> 
 </tbody> 
</table>

![a8302464147ca7bb8f61d4aebd147708.png][]

**@AutoConfigurationPackage注解**

将指定的一个包下的所有组件导入容器当中

自动配置包

在@AutoConfigurationPackage注解中存在一个**@Import(AutoConfigurationPackages.Registrar.class)**注解，自动配置包就是通过这个Registrar类的方法来完成的。

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> <code>@Import</code><code>(AutoConfigurationPackages.Registrar.</code><code>class</code><code>)</code> <code>public</code>&nbsp;<code>@interface</code>&nbsp;<code>AutoConfigurationPackage { </code> </td> 
 </tr> 
 </tbody> 
</table>

![e7d5e6fc38e0af5ac5280d658f6337f4.png][]

由于@AutoConfiguraionPackage是在@EnableAutoConfiguration中，所以@AutoConfigurationPackage是标识在主程序类上，所以metadata为主程序类。

在Registrar中的registerBeanDefinitions方法，首先获取到注解所标识的类，然后将这个类所在的包以及子包的名称放入到一个String数组当中，再将String数组中的包的所有组件导入到容器当中。

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 </td> 
 <td> <code>static</code>&nbsp;<code>class</code>&nbsp;<code>Registrar&nbsp;</code><code>implements</code>&nbsp;<code>ImportBeanDefinitionRegistrar, DeterminableImports { </code> <code>　　</code><code>@Override</code> <code>　　</code><code>public</code>&nbsp;<code>void</code>&nbsp;<code>registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry) { </code> <code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>register(registry,&nbsp;</code><code>new</code>&nbsp;<code>PackageImports(metadata).getPackageNames().toArray(</code><code>new</code>&nbsp;<code>String[</code><code>0</code><code>]));</code> <code>}</code> </td> 
 </tr> 
 </tbody> 
</table>

![8c4f51d4e3cefb9d6375d58b635e78d7.png][]

**这个方法的意思就是将包下的所有组件导入，获取到包名，然后将包名存放到一个String数组中，Register的作用就是将包下的所有组件导入。****这也是为什么Spring容器启动后会自动导入 主程序所在的包及其子包中的所有组件。**

**@Import(AutoConfigurationImportSelector.class)**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 8 </td> 
 <td> <code>@Override</code> <code>public</code>&nbsp;<code>String[] selectImports(AnnotationMetadata annotationMetadata) { </code> <code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>if</code>&nbsp;<code>(!isEnabled(annotationMetadata)) { </code> <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>return</code>&nbsp;<code>NO_IMPORTS;</code> <code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>}</code> <code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>AutoConfigurationEntry autoConfigurationEntry = getAutoConfigurationEntry(annotationMetadata);</code><code>//获取候选方法，该方法就是批量导入一些组件的方法</code> <code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>return</code>&nbsp;<code>StringUtils.toStringArray(autoConfigurationEntry.getConfigurations());</code> <code>}</code> </td> 
 </tr> 
 </tbody> 
</table>

**selectImports()是AutoConfigurationImportSelector的核心函数**，其核心功能就是获取spring.factories中的EnableAutoConfiguration所对应的Configuration类列表，由@EnableAutoConfiguration注解中的exclude/excludeName参数筛选一遍，再由AutoConfigurationImportFilter类所有实例筛选一遍，得到最终的用于Import的configuration和exclusion。

![7cfb89d9db867e0d8f404022b4e99257.png][]

![5f37c75ab2e1b4ae471f88b3fc0399f0.png][]

这个configurations就是所有需要导入到容器中的组件名。

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> <code>List&lt;String&gt; configurations =&nbsp;</code><code>this</code><code>.getCandidateConfigurations(annotationMetadata, attributes);</code><code>//获取到所有需要导入到容器当中的组件</code> </td> 
 </tr> 
 </tbody> 
</table>

![71b7a4702c521baf355eb093159e0c8a.png][]

![e007a5d8015730fa31ea225a9f4c8642.png][]

利用工厂加载 Map<String, List<String>>loadFactoryNames(ClassLoader classLoader) //得到所有组件

**扫描所有jar包类路径下META-INF/spring.factories，把扫描到的这些文件的内容包装成properties对象，从properties中获取到EnableAutoConfiguration.class类（类名）对应的值，然后将他们添加到容器中。**从META-INF/spring.factories 位置来加载一个文件默认扫描我们当前系统里面所有 META-INF/spring.factories位置的文件spring-boot-autoconfigure-2.6.7.jar包里边也有 META-INF/spring.factories。

![ed37baa41c2c7ab5e93da55db3b34e0c.png][]

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 </td> 
 <td> <code># Auto Configure</code> <code>org.springframework.boot.autoconfigure.EnableAutoConfiguration=\</code> <code>org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.context.LifecycleAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.dao.PersistenceExceptionTranslationAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveDataAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.cassandra.CassandraRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveDataAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.couchbase.CouchbaseRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveElasticsearchRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveElasticsearchRestClientAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.jdbc.JdbcRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.ldap.LdapRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.mongo.MongoReactiveRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.solr.SolrRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.r2dbc.R2dbcDataAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.r2dbc.R2dbcRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.r2dbc.R2dbcTransactionManagerAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.h2.H2ConsoleAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.hazelcast.HazelcastJpaDependencyAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.influx.InfluxDbAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jdbc.XADataSourceAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jms.JmsAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jms.JndiConnectionFactoryAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jms.activemq.ActiveMQAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jms.artemis.ArtemisAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.jsonb.JsonbAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.availability.ApplicationAvailabilityAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.ldap.embedded.EmbeddedLdapAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.ldap.LdapAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.mail.MailSenderAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.quartz.QuartzAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.r2dbc.R2dbcAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.rsocket.RSocketMessagingAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.rsocket.RSocketRequesterAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.rsocket.RSocketServerAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.rsocket.RSocketStrategiesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.reactive.ReactiveUserDetailsServiceAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.rsocket.RSocketSecurityAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.saml2.Saml2RelyingPartyAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.sendgrid.SendGridAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.session.SessionAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.oauth2.client.reactive.ReactiveOAuth2ClientAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.security.oauth2.resource.reactive.ReactiveOAuth2ResourceServerAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.transaction.jta.JtaAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.reactive.HttpHandlerAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerFactoryAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.reactive.error.ErrorWebFluxAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.reactive.function.client.ClientHttpConnectorAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.websocket.reactive.WebSocketReactiveAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.websocket.servlet.WebSocketMessagingAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.webservices.WebServicesAutoConfiguration,\</code> <code>org.springframework.boot.autoconfigure.webservices.client.WebServiceTemplateAutoConfiguration</code> </td> 
 </tr> 
 </tbody> 
</table>

每一个这样的xxxAutoConfiguration类都是容器中的一个组件，都加入到容器中；用他们来做自动配置。

每一个自动配置类具有自动配置功能

举例：以HttpEncodingAutoConfiguration为例解释自动配置原理；

![38f19c132d21ad1af94642cb4c8092fb.png][]

@Configuration标识这是一个配置类，可以给容器添加组件

@EnableConfigurationProperties(ServerProperties.class)用于指定启动类

ConfigurationProperties功能：将配置文件中对应的值和HttpEncodingProperties绑定起来；并把HttpEncodingProperties加入到IOC容器中。

@ConditionalOnWebApplication Spring底层@Conditional注解，根据不同的条件，如果满足指定的条件，整个配置类里面的配置就会生效； 用于判断当前应用是web应用，如果是，当前配置类生效

@ConditionalOnClass(CharacterEncodingFilter.class)，判断当前项目有没有这个类，CharacterEncodingFilter;SpringMVC中进行乱码解决的过滤器；

@ConditionalOnProperty(prefix = "server.servlet.encoding", value = "enabled", matchIfMissing = true)用于判断配置文件中是否存在某个配置 spring.http.encoding.enabled;如果不存在，判断同样成立。即使不配置Spring.http.encoding.enable=true，也默认生效。

![a6bfc60371865b7394925631298385aa.png][]

![e751e157ea82b9e36aea3af61d6c3e36.png][]

根据当前不同的条件判断，决定这个配置类是否生效。

可以在application.properties中配置

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> <code>spring.http.encoding.enabled=</code><code>true</code> </td> 
 </tr> 
 </tbody> 
</table>

[Common Application Properties]: https://docs.spring.io/spring-boot/docs/current/reference/html/application-properties.html#application-properties.core.spring.banner.charset
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