Spring Boot自动化配置
一 点睛
Spring 4.x提供了基于条件来配置Bean的能力，Spring Boot的神奇的实现也是基于这一原理的。
针对1.3.7.RELEASE版本，Spring Boot关于自动化配置的源码在下面路径：
主要包含了如下所示的配置：
二 查看当前项目中已启用的自动配置
1 在application.propertis中设置如下属性：
debug=true
2 启动项目
3 观察控制台输出
=========================
AUTO-CONFIGURATION REPORT
=========================
//已启用的自动配置
Positive matches:
-----------------
DispatcherServletAutoConfiguration matched
- @ConditionalOnClass classes found: org.springframework.web.servlet.DispatcherServlet (OnClassCondition)
- found web application StandardServletEnvironment (OnWebApplicationCondition)
DispatcherServletAutoConfiguration.DispatcherServletConfiguration matched
- @ConditionalOnClass classes found: javax.servlet.ServletRegistration (OnClassCondition)
- no ServletRegistrationBean found (DispatcherServletAutoConfiguration.DefaultDispatcherServletCondition)
EmbeddedServletContainerAutoConfiguration matched
- found web application StandardServletEnvironment (OnWebApplicationCondition)
EmbeddedServletContainerAutoConfiguration.EmbeddedTomcat matched
- @ConditionalOnClass classes found: javax.servlet.Servlet,org.apache.catalina.startup.Tomcat (OnClassCondition)
- @ConditionalOnMissingBean (types: org.springframework.boot.context.embedded.EmbeddedServletContainerFactory; SearchStrategy: current) found no beans (OnBeanCondition)
ErrorMvcAutoConfiguration matched
- @ConditionalOnClass classes found: javax.servlet.Servlet,org.springframework.web.servlet.DispatcherServlet (OnClassCondition)
- found web application StandardServletEnvironment (OnWebApplicationCondition)
ErrorMvcAutoConfiguration#basicErrorController matched
- @ConditionalOnMissingBean (types: org.springframework.boot.autoconfigure.web.ErrorController; SearchStrategy: current) found no beans (OnBeanCondition)
ErrorMvcAutoConfiguration#errorAttributes matched
- @ConditionalOnMissingBean (types: org.springframework.boot.autoconfigure.web.ErrorAttributes; SearchStrategy: current) found no beans (OnBeanCondition)
ErrorMvcAutoConfiguration.WhitelabelErrorViewConfiguration matched
- No error template view detected (ErrorMvcAutoConfiguration.ErrorTemplateMissingCondition)
- matched (OnPropertyCondition)
ErrorMvcAutoConfiguration.WhitelabelErrorViewConfiguration#beanNameViewResolver matched
- @ConditionalOnMissingBean (types: org.springframework.web.servlet.view.BeanNameViewResolver; SearchStrategy: all) found no beans (OnBeanCondition)
ErrorMvcAutoConfiguration.WhitelabelErrorViewConfiguration#defaultErrorView matched
- @ConditionalOnMissingBean (names: error; SearchStrategy: all) found no beans (OnBeanCondition)
GenericCacheConfiguration matched
- Automatic cache type (CacheCondition)
HttpEncodingAutoConfiguration matched
- @ConditionalOnClass classes found: org.springframework.web.filter.CharacterEncodingFilter (OnClassCondition)
- matched (OnPropertyCondition)
HttpEncodingAutoConfiguration#characterEncodingFilter matched
- @ConditionalOnMissingBean (types: org.springframework.web.filter.CharacterEncodingFilter; SearchStrategy: all) found no beans (OnBeanCondition)
HttpMessageConvertersAutoConfiguration matched
- @ConditionalOnClass classes found: org.springframework.http.converter.HttpMessageConverter (OnClassCondition)
HttpMessageConvertersAutoConfiguration#messageConverters matched
- @ConditionalOnMissingBean (types: org.springframework.boot.autoconfigure.web.HttpMessageConverters; SearchStrategy: all) found no beans (OnBeanCondition)
HttpMessageConvertersAutoConfiguration.StringHttpMessageConverterConfiguration matched
- @ConditionalOnClass classes found: org.springframework.http.converter.StringHttpMessageConverter (OnClassCondition)
HttpMessageConvertersAutoConfiguration.StringHttpMessageConverterConfiguration#stringHttpMessageConverter matched
- @ConditionalOnMissingBean (types: org.springframework.http.converter.StringHttpMessageConverter; SearchStrategy: all) found no beans (OnBeanCondition)
JacksonAutoConfiguration matched
- @ConditionalOnClass classes found: com.fasterxml.jackson.databind.ObjectMapper (OnClassCondition)
JacksonAutoConfiguration.JacksonObjectMapperBuilderConfiguration matched
- @ConditionalOnClass classes found: com.fasterxml.jackson.databind.ObjectMapper,org.springframework.http.converter.json.Jackson2ObjectMapperBuilder (OnClassCondition)
JacksonAutoConfiguration.JacksonObjectMapperBuilderConfiguration#jacksonObjectMapperBuilder matched
- @ConditionalOnMissingBean (types: org.springframework.http.converter.json.Jackson2ObjectMapperBuilder; SearchStrategy: all) found no beans (OnBeanCondition)
JacksonAutoConfiguration.JacksonObjectMapperConfiguration matched
- @ConditionalOnClass classes found: com.fasterxml.jackson.databind.ObjectMapper,org.springframework.http.converter.json.Jackson2ObjectMapperBuilder (OnClassCondition)
JacksonAutoConfiguration.JacksonObjectMapperConfiguration#jacksonObjectMapper matched
- @ConditionalOnMissingBean (types: com.fasterxml.jackson.databind.ObjectMapper; SearchStrategy: all) found no beans (OnBeanCondition)
JacksonHttpMessageConvertersConfiguration.MappingJackson2HttpMessageConverterConfiguration matched
- @ConditionalOnClass classes found: com.fasterxml.jackson.databind.ObjectMapper (OnClassCondition)
- matched (OnPropertyCondition)
- @ConditionalOnBean (types: com.fasterxml.jackson.databind.ObjectMapper; SearchStrategy: all) found the following [jacksonObjectMapper] (OnBeanCondition)
JacksonHttpMessageConvertersConfiguration.MappingJackson2HttpMessageConverterConfiguration#mappingJackson2HttpMessageConverter matched
- @ConditionalOnMissingBean (types: org.springframework.http.converter.json.MappingJackson2HttpMessageConverter; SearchStrategy: all) found no beans (OnBeanCondition)
JmxAutoConfiguration matched
- @ConditionalOnClass classes found: org.springframework.jmx.export.MBeanExporter (OnClassCondition)
- matched (OnPropertyCondition)
JmxAutoConfiguration#mbeanExporter matched
- @ConditionalOnMissingBean (types: org.springframework.jmx.export.MBeanExporter; SearchStrategy: current) found no beans (OnBeanCondition)
JmxAutoConfiguration#mbeanServer matched
- @ConditionalOnMissingBean (types: javax.management.MBeanServer; SearchStrategy: all) found no beans (OnBeanCondition)
JmxAutoConfiguration#objectNamingStrategy matched
- @ConditionalOnMissingBean (types: org.springframework.jmx.export.naming.ObjectNamingStrategy; SearchStrategy: current) found no beans (OnBeanCondition)
MultipartAutoConfiguration matched
- @ConditionalOnClass classes found: javax.servlet.Servlet,org.springframework.web.multipart.support.StandardServletMultipartResolver,javax.servlet.MultipartConfigElement (OnClassCondition)
- matched (OnPropertyCondition)
MultipartAutoConfiguration#multipartConfigElement matched
- @ConditionalOnMissingBean (types: javax.servlet.MultipartConfigElement; SearchStrategy: all) found no beans (OnBeanCondition)
MultipartAutoConfiguration#multipartResolver matched
- @ConditionalOnMissingBean (types: org.springframework.web.multipart.MultipartResolver; SearchStrategy: all) found no beans (OnBeanCondition)
NoOpCacheConfiguration matched
- Automatic cache type (CacheCondition)
PropertyPlaceholderAutoConfiguration#propertySourcesPlaceholderConfigurer matched
- @ConditionalOnMissingBean (types: org.springframework.context.support.PropertySourcesPlaceholderConfigurer; SearchStrategy: current) found no beans (OnBeanCondition)
RedisCacheConfiguration matched
- Automatic cache type (CacheCondition)
ServerPropertiesAutoConfiguration matched
- found web application StandardServletEnvironment (OnWebApplicationCondition)
ServerPropertiesAutoConfiguration#serverProperties matched
- @ConditionalOnMissingBean (types: org.springframework.boot.autoconfigure.web.ServerProperties; SearchStrategy: current) found no beans (OnBeanCondition)
SimpleCacheConfiguration matched
- Automatic cache type (CacheCondition)
WebMvcAutoConfiguration matched
- @ConditionalOnClass classes found: javax.servlet.Servlet,org.springframework.web.servlet.DispatcherServlet,org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter (OnClassCondition)
- found web application StandardServletEnvironment (OnWebApplicationCondition)
- @ConditionalOnMissingBean (types: org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport; SearchStrategy: all) found no beans (OnBeanCondition)
WebMvcAutoConfiguration#hiddenHttpMethodFilter matched
- @ConditionalOnMissingBean (types: org.springframework.web.filter.HiddenHttpMethodFilter; SearchStrategy: all) found no beans (OnBeanCondition)
WebMvcAutoConfiguration#httpPutFormContentFilter matched
- @ConditionalOnMissingBean (types: org.springframework.web.filter.HttpPutFormContentFilter; SearchStrategy: all) found no beans (OnBeanCondition)
WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter#defaultViewResolver matched
- @ConditionalOnMissingBean (types: org.springframework.web.servlet.view.InternalResourceViewResolver; SearchStrategy: all) found no beans (OnBeanCondition)
WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter#requestContextFilter matched
- @ConditionalOnMissingBean (types: org.springframework.web.context.request.RequestContextListener,org.springframework.web.filter.RequestContextFilter; SearchStrategy: all) found no beans (OnBeanCondition)
WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter#viewResolver matched
- @ConditionalOnBean (types: org.springframework.web.servlet.ViewResolver; SearchStrategy: all) found the following [defaultViewResolver, beanNameViewResolver, mvcViewResolver] @ConditionalOnMissingBean (names: viewResolver; types: org.springframework.web.servlet.view.ContentNegotiatingViewResolver; SearchStrategy: all) found no beans (OnBeanCondition)
WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter.FaviconConfiguration matched
- matched (OnPropertyCondition)
WebSocketAutoConfiguration matched
- @ConditionalOnClass classes found: javax.servlet.Servlet,javax.websocket.server.ServerContainer (OnClassCondition)
- found web application StandardServletEnvironment (OnWebApplicationCondition)
WebSocketAutoConfiguration.TomcatWebSocketConfiguration matched
- @ConditionalOnClass classes found: org.apache.catalina.startup.Tomcat,org.apache.tomcat.websocket.server.WsSci (OnClassCondition)
WebSocketAutoConfiguration.TomcatWebSocketConfiguration#websocketContainerCustomizer matched
- Required JVM version 1.7 or newer found 1.8 (OnJavaCondition)
- @ConditionalOnMissingBean (names: websocketContainerCustomizer; SearchStrategy: all) found no beans (OnBeanCondition)
//未启用的自动配置
Negative matches:
-----------------
ActiveMQAutoConfiguration did not match
- required @ConditionalOnClass classes not found: javax.jms.ConnectionFactory,org.apache.activemq.ActiveMQConnectionFactory (OnClassCondition)
AopAutoConfiguration did not match
- required @ConditionalOnClass classes not found: org.aspectj.lang.annotation.Aspect,org.aspectj.lang.reflect.Advice (OnClassCondition)
ArtemisAutoConfiguration did not match
- required @ConditionalOnClass classes not found: javax.jms.ConnectionFactory,org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory (OnClassCondition)
BatchAutoConfiguration did not match
- required @ConditionalOnClass classes not found: org.springframework.batch.core.launch.JobLauncher,org.springframework.jdbc.core.JdbcOperations (OnClassCondition)
CacheAutoConfiguration did not match
- @ConditionalOnClass classes found: org.springframework.cache.CacheManager (OnClassCondition)
- @ConditionalOnBean (types: org.springframework.cache.interceptor.CacheAspectSupport; SearchStrategy: all) found no beans (OnBeanCondition)
CacheAutoConfiguration.CacheManagerJpaDependencyConfiguration did not match
- required @ConditionalOnClass classes not found: org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean (OnClassCondition)
- Ancestor 'org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration' did not match (ConditionEvaluationReport.AncestorsMatchedCondition)
.........
XADataSourceAutoConfiguration did not match
- required @ConditionalOnClass classes not found: javax.transaction.TransactionManager,org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType (OnClassCondition)
Exclusions:
-----------
None
Unconditional classes:
----------------------
org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration
org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration