SpringBoot 分析底层默认的自动配置项@EnableAutoConfiguration

刺骨的言语ヽ痛彻心扉 2022-01-31 20:41 265阅读 0赞

### 一、SpringBoot 为什么需要配置文件         ###

SpringBoot 在底层给我们自动做了很多默认配置，所以SpringBoot 项目不编写配置文件也可以正常运行，但是根据具体开发需要修改SpringBoot自动配置的默认值；

在项目中 SpringBoot 使用默认的全局配置文件为：application.properties / application.yml，前面我们接触了它的使用，这次认识一下 SpringBoot 的自动配置，有助于后面修改框架配置项的认知。

**1、在哪里查询 SpringBoot 的默认自动配置项**

1）SpringBoot 官方学习文档中查看

![20190513151132874.png][]

**2）在项目中分析下程序启动类 注解@EnableAutoConfiguration**

（1）查看注解 @SpringBootApplication 代码

@SpringBootApplication 是被 @EnableAutoConfiguration，@ComponentScan 等注解修饰，换言之，Springboot 提供了统一的注解@SpringBootApplication 作为启动类，通过run方法（**整个程序入口，启动springboot项目，创建内置tomcat, 使用tomcat加载springmvc 注解启动类**）启动项目。  
         @SpringBootApplication 扫包范围：**当前包和同级包(包含子包)都可以扫到。**

@SpringBootApplication
    public class Springbootdemo1Application {
    
        public static void main(String[] args) {
            SpringApplication.run(Springbootdemo1Application.class, args);
        }
    
    }

（2）查看注解@EnableAutoConfiguration

作用：让Springboot 根据应用声明的架包依赖来对Spring框架进行自动配置。  
              @ComponentScan  
              作用：声明扫包范围

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDAyODU0_size_16_color_FFFFFF_t_70][]  ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDAyODU0_size_16_color_FFFFFF_t_70 1][]

（3）查看 AutoConfigurationImportSelector 类中的 selectImports 方法

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDAyODU0_size_16_color_FFFFFF_t_70 2][]

（4）getCandidateConfigurations() 方法调用了SpringFactoriesLoader.loadFactoryNames() 方法

![2019051315364231.png][]

![20190513154313979.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDAyODU0_size_16_color_FFFFFF_t_70 3][]

**   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，然后把他们添加在容器中;  **

**即将类路径下 META-INF/spring.factories里面配置的所有 EnableAutoConfiguration的值加入到了容器中。**

**（5） 看一下META‐INF/spring.factories 中默认全局配置文件内容如下****：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDAyODU0_size_16_color_FFFFFF_t_70 4][]

# Initializers
    org.springframework.context.ApplicationContextInitializer=\
    org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer,\
    org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener
    
    # Application Listeners
    org.springframework.context.ApplicationListener=\
    org.springframework.boot.autoconfigure.BackgroundPreinitializer
    
    # Auto Configuration Import Listeners
    org.springframework.boot.autoconfigure.AutoConfigurationImportListener=\
    org.springframework.boot.autoconfigure.condition.ConditionEvaluationReportAutoConfigurationImportListener
    
    # Auto Configuration Import Filters
    org.springframework.boot.autoconfigure.AutoConfigurationImportFilter=\
    org.springframework.boot.autoconfigure.condition.OnBeanCondition,\
    org.springframework.boot.autoconfigure.condition.OnClassCondition,\
    org.springframework.boot.autoconfigure.condition.OnWebApplicationCondition
    
    # Auto Configure
    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,\
    org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration,\
    org.springframework.boot.autoconfigure.cloud.CloudServiceConnectorsAutoConfiguration,\
    org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,\
    org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration,\
    org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,\
    org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration,\
    org.springframework.boot.autoconfigure.dao.PersistenceExceptionTranslationAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveDataAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.cassandra.CassandraRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveDataAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.couchbase.CouchbaseRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.jdbc.JdbcRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.ldap.LdapRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.mongo.MongoReactiveRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.solr.SolrRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration,\
    org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration,\
    org.springframework.boot.autoconfigure.elasticsearch.jest.JestAutoConfiguration,\
    org.springframework.boot.autoconfigure.elasticsearch.rest.RestClientAutoConfiguration,\
    org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration,\
    org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration,\
    org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration,\
    org.springframework.boot.autoconfigure.h2.H2ConsoleAutoConfiguration,\
    org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration,\
    org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration,\
    org.springframework.boot.autoconfigure.hazelcast.HazelcastJpaDependencyAutoConfiguration,\
    org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration,\
    org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration,\
    org.springframework.boot.autoconfigure.influx.InfluxDbAutoConfiguration,\
    org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration,\
    org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration,\
    org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,\
    org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,\
    org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,\
    org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration,\
    org.springframework.boot.autoconfigure.jdbc.XADataSourceAutoConfiguration,\
    org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration,\
    org.springframework.boot.autoconfigure.jms.JmsAutoConfiguration,\
    org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration,\
    org.springframework.boot.autoconfigure.jms.JndiConnectionFactoryAutoConfiguration,\
    org.springframework.boot.autoconfigure.jms.activemq.ActiveMQAutoConfiguration,\
    org.springframework.boot.autoconfigure.jms.artemis.ArtemisAutoConfiguration,\
    org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration,\
    org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration,\
    org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration,\
    org.springframework.boot.autoconfigure.jsonb.JsonbAutoConfiguration,\
    org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration,\
    org.springframework.boot.autoconfigure.ldap.embedded.EmbeddedLdapAutoConfiguration,\
    org.springframework.boot.autoconfigure.ldap.LdapAutoConfiguration,\
    org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration,\
    org.springframework.boot.autoconfigure.mail.MailSenderAutoConfiguration,\
    org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration,\
    org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration,\
    org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\
    org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration,\
    org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\
    org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\
    org.springframework.boot.autoconfigure.quartz.QuartzAutoConfiguration,\
    org.springframework.boot.autoconfigure.reactor.core.ReactorCoreAutoConfiguration,\
    org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration,\
    org.springframework.boot.autoconfigure.security.servlet.SecurityRequestMatcherProviderAutoConfiguration,\
    org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration,\
    org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration,\
    org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration,\
    org.springframework.boot.autoconfigure.security.reactive.ReactiveUserDetailsServiceAutoConfiguration,\
    org.springframework.boot.autoconfigure.sendgrid.SendGridAutoConfiguration,\
    org.springframework.boot.autoconfigure.session.SessionAutoConfiguration,\
    org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration,\
    org.springframework.boot.autoconfigure.security.oauth2.client.reactive.ReactiveOAuth2ClientAutoConfiguration,\
    org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration,\
    org.springframework.boot.autoconfigure.security.oauth2.resource.reactive.ReactiveOAuth2ResourceServerAutoConfiguration,\
    org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\
    org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration,\
    org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration,\
    org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\
    org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration,\
    org.springframework.boot.autoconfigure.transaction.jta.JtaAutoConfiguration,\
    org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.reactive.HttpHandlerAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerFactoryAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.reactive.error.ErrorWebFluxAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.reactive.function.client.ClientHttpConnectorAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration,\
    org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\
    org.springframework.boot.autoconfigure.websocket.reactive.WebSocketReactiveAutoConfiguration,\
    org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration,\
    org.springframework.boot.autoconfigure.websocket.servlet.WebSocketMessagingAutoConfiguration,\
    org.springframework.boot.autoconfigure.webservices.WebServicesAutoConfiguration,\
    org.springframework.boot.autoconfigure.webservices.client.WebServiceTemplateAutoConfiguration
    
    # Failure analyzers
    org.springframework.boot.diagnostics.FailureAnalyzer=\
    org.springframework.boot.autoconfigure.diagnostics.analyzer.NoSuchBeanDefinitionFailureAnalyzer,\
    org.springframework.boot.autoconfigure.jdbc.DataSourceBeanCreationFailureAnalyzer,\
    org.springframework.boot.autoconfigure.jdbc.HikariDriverConfigurationFailureAnalyzer,\
    org.springframework.boot.autoconfigure.session.NonUniqueSessionRepositoryFailureAnalyzer
    
    # Template availability providers
    org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider=\
    org.springframework.boot.autoconfigure.freemarker.FreeMarkerTemplateAvailabilityProvider,\
    org.springframework.boot.autoconfigure.mustache.MustacheTemplateAvailabilityProvider,\
    org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAvailabilityProvider,\
    org.springframework.boot.autoconfigure.thymeleaf.ThymeleafTemplateAvailabilityProvider,\
    org.springframework.boot.autoconfigure.web.servlet.JspTemplateAvailabilityProvider

**2、具体分析下 HttpEncodingAutoConfiguration 原理**

@Configuration
    @EnableConfigurationProperties({HttpProperties.class})
    @ConditionalOnWebApplication(
        type = Type.SERVLET
    )
    @ConditionalOnClass({CharacterEncodingFilter.class})
    @ConditionalOnProperty(
        prefix = "spring.http.encoding",
        value = {"enabled"},
        matchIfMissing = true
    )
    public class HttpEncodingAutoConfiguration {
        private final Encoding properties;
    
        public HttpEncodingAutoConfiguration(HttpProperties properties) {
            this.properties = properties.getEncoding();
        }
    
        @Bean
        @ConditionalOnMissingBean
        public CharacterEncodingFilter characterEncodingFilter() {
            CharacterEncodingFilter filter = new OrderedCharacterEncodingFilter();
            filter.setEncoding(this.properties.getCharset().name());
            filter.setForceRequestEncoding(this.properties.shouldForce(org.springframework.boot.autoconfigure.http.HttpProperties.Encoding.Type.REQUEST));
            filter.setForceResponseEncoding(this.properties.shouldForce(org.springframework.boot.autoconfigure.http.HttpProperties.Encoding.Type.RESPONSE));
            return filter;
        }
    
        @Bean
        public HttpEncodingAutoConfiguration.LocaleCharsetMappingsCustomizer localeCharsetMappingsCustomizer() {
            return new HttpEncodingAutoConfiguration.LocaleCharsetMappingsCustomizer(this.properties);
        }
    
        private static class LocaleCharsetMappingsCustomizer implements WebServerFactoryCustomizer<ConfigurableServletWebServerFactory>, Ordered {
            private final Encoding properties;
    
            LocaleCharsetMappingsCustomizer(Encoding properties) {
                this.properties = properties;
            }
    
            public void customize(ConfigurableServletWebServerFactory factory) {
                if (this.properties.getMapping() != null) {
                    factory.setLocaleCharsetMappings(this.properties.getMapping());
                }
    
            }
    
            public int getOrder() {
                return 0;
            }
        }
    }

@Configuration : 定义配置类。

@EnableConfigurationProperties(\{HttpProperties.class\})：

启动指定类的ConfigurationProperties功能；将配置文件中对应的值和HttpProperties绑定起来；并把HttpProperties加入到ioc容器中。

@ConditionalOnWebApplication(type = Type.SERVLET)：

判断当前应用是否是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中解决乱码的过滤器。

@ConditionalOnProperty(prefix = "spring.http.encoding", value = "enabled", matchIfMissing = true)：

判断配置文件中是否存在某个配置 spring.http.encoding.enabled；matchIfMissing表示，即使我们配置文件中不配置spring.http.encoding.enabled=true，也是默认生效的；

@Bean ：定义Bean

@Conditional注解（Spring注解版）：

条件注解，通过判断类路径下有没有相应配置的jar包来确定是否加载和自动配置这个类。

**3、了解注解@Conditional派生的注解**

**核心：@Conditional指定的条件成立，才给容器中添加组件，配置类里面的所有内容才生效；即,自动配置类必须在一定的条件下才能生效；**

@ConditionalOnJava：系统的java版本是否符合要求

@ConditionalOnBean：容器中存在指定Bean；

@ConditionalOnMissingBean ：容器中不存在指定Bean；

@ConditionalOnExpression ：满足SpEL表达式指定

@ConditionalOnClass ：系统中有指定的类

@ConditionalOnMissingClass： 系统中没有指定的类

@ConditionalOnSingleCandidate ：容器中只有一个指定的Bean，或者这个Bean是首选Bean

@ConditionalOnProperty：系统中指定的属性是否有指定的值

@ConditionalOnResource ：类路径下是否存在指定资源文件

@ConditionalOnWebApplication ：当前是web环境

@ConditionalOnNotWebApplication ：当前不是web环境

### 二、项目中查看生效与未生效的配置类 ###

在全局配置文件中启用 **debug=true** 配置，就可查看控制台打印的自动配置报告。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDAyODU0_size_16_color_FFFFFF_t_70 5][]       ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDAyODU0_size_16_color_FFFFFF_t_70 6][]

总结：

1、SpringBoot启动会加载大量的自动配置类；

2、首先检查SpringBoot默认的自动配置类是否满足我们的需求；

3、具体查看这个自动配置类中配置了哪些组件；

4、 给容器中的自动配置类添加组件的时候，会从properties类中获取某些属性。我们就可以在配置文件中指定这些属性的值；

5、xxxxAutoConfigurartion：自动配置类，给容器中添加组件；xxxxProperties:封装配置文件中相关属性；

6、对后面编写**自定义启动器（xxx-spring-boot-starter）**做简单了解；

ends ~

[20190513151132874.png]: /images/20220201/301fcd299404462ba6430efd7fa1c846.png
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