Spring Boot的自动配置的原理

Posted 2020-10-13 人生若只如初见yao

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Spring Boot在进行SpringApplication对象实例化时会加载META-INF/spring.factories文件，将该配置文件中的配置载入到Spring容器。

1.1.1. Maven下载源码

通过 dependency:sources 该命令可以下载该项目中所有的依赖的包的源码。

1.1.2. 源码分析

org.springframework.boot.SpringApplication：

org.springframework.core.io.support.SpringFactoriesLoader:

由此可见，读取该配置文件来加载内容。

1.1.3. Spring.factories文件

  1 # Initializers
  2 
  3 org.springframework.context.ApplicationContextInitializer=\\
  4 
  5 org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer,\\
  6 
  7 org.springframework.boot.autoconfigure.logging.AutoConfigurationReportLoggingInitializer
  8 
  9  
 10 
 11 # Application Listeners
 12 
 13 org.springframework.context.ApplicationListener=\\
 14 
 15 org.springframework.boot.autoconfigure.BackgroundPreinitializer
 16 
 17  
 18 
 19 # Auto Configuration Import Listeners
 20 
 21 org.springframework.boot.autoconfigure.AutoConfigurationImportListener=\\
 22 
 23 org.springframework.boot.autoconfigure.condition.ConditionEvaluationReportAutoConfigurationImportListener
 24 
 25  
 26 
 27 # Auto Configuration Import Filters
 28 
 29 org.springframework.boot.autoconfigure.AutoConfigurationImportFilter=\\
 30 
 31 org.springframework.boot.autoconfigure.condition.OnClassCondition
 32 
 33  
 34 
 35 # Auto Configure
 36 
 37 org.springframework.boot.autoconfigure.EnableAutoConfiguration=\\
 38 
 39 org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\\
 40 
 41 org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\\
 42 
 43 org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\\
 44 
 45 org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\\
 46 
 47 org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\\
 48 
 49 org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration,\\
 50 
 51 org.springframework.boot.autoconfigure.cloud.CloudAutoConfiguration,\\
 52 
 53 org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,\\
 54 
 55 org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration,\\
 56 
 57 org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,\\
 58 
 59 org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration,\\
 60 
 61 org.springframework.boot.autoconfigure.dao.PersistenceExceptionTranslationAutoConfiguration,\\
 62 
 63 org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration,\\
 64 
 65 org.springframework.boot.autoconfigure.data.cassandra.CassandraRepositoriesAutoConfiguration,\\
 66 
 67 org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration,\\
 68 
 69 org.springframework.boot.autoconfigure.data.couchbase.CouchbaseRepositoriesAutoConfiguration,\\
 70 
 71 org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration,\\
 72 
 73 org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration,\\
 74 
 75 org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration,\\
 76 
 77 org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration,\\
 78 
 79 org.springframework.boot.autoconfigure.data.ldap.LdapDataAutoConfiguration,\\
 80 
 81 org.springframework.boot.autoconfigure.data.ldap.LdapRepositoriesAutoConfiguration,\\
 82 
 83 org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,\\
 84 
 85 org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration,\\
 86 
 87 org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration,\\
 88 
 89 org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration,\\
 90 
 91 org.springframework.boot.autoconfigure.data.solr.SolrRepositoriesAutoConfiguration,\\
 92 
 93 org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\\
 94 
 95 org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\\
 96 
 97 org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration,\\
 98 
 99 org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration,\\
100 
101 org.springframework.boot.autoconfigure.elasticsearch.jest.JestAutoConfiguration,\\
102 
103 org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration,\\
104 
105 org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration,\\
106 
107 org.springframework.boot.autoconfigure.h2.H2ConsoleAutoConfiguration,\\
108 
109 org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration,\\
110 
111 org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration,\\
112 
113 org.springframework.boot.autoconfigure.hazelcast.HazelcastJpaDependencyAutoConfiguration,\\
114 
115 org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration,\\
116 
117 org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration,\\
118 
119 org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,\\
120 
121 org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,\\
122 
123 org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,\\
124 
125 org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration,\\
126 
127 org.springframework.boot.autoconfigure.jdbc.XADataSourceAutoConfiguration,\\
128 
129 org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration,\\
130 
131 org.springframework.boot.autoconfigure.jms.JmsAutoConfiguration,\\
132 
133 org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration,\\
134 
135 org.springframework.boot.autoconfigure.jms.JndiConnectionFactoryAutoConfiguration,\\
136 
137 org.springframework.boot.autoconfigure.jms.activemq.ActiveMQAutoConfiguration,\\
138 
139 org.springframework.boot.autoconfigure.jms.artemis.ArtemisAutoConfiguration,\\
140 
141 org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration,\\
142 
143 org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration,\\
144 
145 org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration,\\
146 
147 org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration,\\
148 
149 org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration,\\
150 
151 org.springframework.boot.autoconfigure.ldap.embedded.EmbeddedLdapAutoConfiguration,\\
152 
153 org.springframework.boot.autoconfigure.ldap.LdapAutoConfiguration,\\
154 
155 org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration,\\
156 
157 org.springframework.boot.autoconfigure.mail.MailSenderAutoConfiguration,\\
158 
159 org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration,\\
160 
161 org.springframework.boot.autoconfigure.mobile.DeviceResolverAutoConfiguration,\\
162 
163 org.springframework.boot.autoconfigure.mobile.DeviceDelegatingViewResolverAutoConfiguration,\\
164 
165 org.springframework.boot.autoconfigure.mobile.SitePreferenceAutoConfiguration,\\
166 
167 org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration,\\
168 
169 org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\\
170 
171 org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\\
172 
173 org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\\
174 
175 org.springframework.boot.autoconfigure.reactor.ReactorAutoConfiguration,\\
176 
177 org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration,\\
178 
179 org.springframework.boot.autoconfigure.security.SecurityFilterAutoConfiguration,\\
180 
181 org.springframework.boot.autoconfigure.security.FallbackWebSecurityAutoConfiguration,\\
182 
183 org.springframework.boot.autoconfigure.security.oauth2.OAuth2AutoConfiguration,\\
184 
185 org.springframework.boot.autoconfigure.sendgrid.SendGridAutoConfiguration,\\
186 
187 org.springframework.boot.autoconfigure.session.SessionAutoConfiguration,\\
188 
189 org.springframework.boot.autoconfigure.social.SocialWebAutoConfiguration,\\
190 
191 org.springframework.boot.autoconfigure.social.FacebookAutoConfiguration,\\
192 
193 org.springframework.boot.autoconfigure.social.LinkedInAutoConfiguration,\\
194 
195 org.springframework.boot.autoconfigure.social.TwitterAutoConfiguration,\\
196 
197 org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\\
198 
199 org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\\
200 
201 org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration,\\
202 
203 org.springframework.boot.autoconfigure.transaction.jta.JtaAutoConfiguration,\\
204 
205 org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\\
206 
207 org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration,\\
208 
209 org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration,\\
210 
211 org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration,\\
212 
213 org.springframework.boot.autoconfigure.web.HttpEncodingAutoConfiguration,\\
214 
215 org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration,\\
216 
217 org.springframework.boot.autoconfigure.web.MultipartAutoConfiguration,\\
218 
219 org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration,\\
220 
221 org.springframework.boot.autoconfigure.web.WebClientAutoConfiguration,\\
222 
223 org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration,\\
224 
225 org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration,\\
226 
227 org.springframework.boot.autoconfigure.websocket.WebSocketMessagingAutoConfiguration,\\
228 
229 org.springframework.boot.autoconfigure.webservices.WebServicesAutoConfiguration
230 
231  
232 
233 # Failure analyzers
234 
235 org.springframework.boot.diagnostics.FailureAnalyzer=\\
236 
237 org.springframework.boot.autoconfigure.diagnostics.analyzer.NoSuchBeanDefinitionFailureAnalyzer,\\
238 
239 org.springframework.boot.autoconfigure.jdbc.DataSourceBeanCreationFailureAnalyzer,\\
240 
241 org.springframework.boot.autoconfigure.jdbc.HikariDriverConfigurationFailureAnalyzer
242 
243  
244 
245 # Template availability providers
246 
247 org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider=\\
248 
249 org.springframework.boot.autoconfigure.freemarker.FreeMarkerTemplateAvailabilityProvider,\\
250 
251 org.springframework.boot.autoconfigure.mustache.MustacheTemplateAvailabilityProvider,\\
252 
253 org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAvailabilityProvider,\\
254 
255 org.springframework.boot.autoconfigure.thymeleaf.ThymeleafTemplateAvailabilityProvider,\\
256 
257 org.springframework.boot.autoconfigure.web.JspTemplateAvailabilityProvider

1.1.4. 举例：Redis的自动配置

从上述的配置中可以看出，org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration是Redis的自动配置。

内容：

1.1.5. 条件注解

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