008-Spring Boot @EnableAutoConfiguration深入分析、内部如何使用EnableAutoConfiguration
一、EnableAutoConfiguration
1、EnableAutoConfiguration原理
springboot程序入口使用注解@SpringBootApplication,SpringBootApplication注解的定义如下
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(excludeFilters = {
@Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class),
@Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFilter.class) })
头部有三个注解,
@SpringBootConfiguration:表示是一个配置类
@ComponentScan:自动扫描,
@EnableAutoConfiguration:
作用:从classpath中搜索所有META-INF/spring.factories配置文件,然后将其中org.springframework.boot.autoconfigure.EnableAutoConfiguration 的key对应的配置项加载到容器中。
只有spring.boot.enableautoconfiguration 为true【默认为true】的时候,才启用自动配置
关键点:1》、ImportSelector改接口的方法的返回值都会被纳入到spring容器管理中;2》、SpringFactoriesLoader该类可以从classpath中搜索所有的 META-INF/spring.factories配置文件,并读取配置,交由ImportSelector接口纳入spring处理
1.5版本以前
@Import(EnableAutoConfigurationImportSelector.class)
public @interface EnableAutoConfiguration {
查看EnableAutoConfigurationImportSelector 查看父类AutoConfigurationImportSelector
public String[] selectImports(AnnotationMetadata annotationMetadata) {
if (!isEnabled(annotationMetadata)) {
return NO_IMPORTS;
}
try {
AutoConfigurationMetadata autoConfigurationMetadata = AutoConfigurationMetadataLoader
.loadMetadata(this.beanClassLoader);
AnnotationAttributes attributes = getAttributes(annotationMetadata);
List<String> configurations = getCandidateConfigurations(annotationMetadata,
attributes);
configurations = removeDuplicates(configurations);
configurations = sort(configurations, autoConfigurationMetadata);
Set<String> exclusions = getExclusions(annotationMetadata, attributes);
checkExcludedClasses(configurations, exclusions);
configurations.removeAll(exclusions);
configurations = filter(configurations, autoConfigurationMetadata);
fireAutoConfigurationImportEvents(configurations, exclusions);
return configurations.toArray(new String[configurations.size()]);
}
catch (IOException ex) {
throw new IllegalStateException(ex);
}
}
调用了getCandidateConfigurations
protected List<String> getCandidateConfigurations(AnnotationMetadata metadata,
AnnotationAttributes attributes) {
List<String> configurations = SpringFactoriesLoader.loadFactoryNames(
getSpringFactoriesLoaderFactoryClass(), getBeanClassLoader());
Assert.notEmpty(configurations,
"No auto configuration classes found in META-INF/spring.factories. If you "
+ "are using a custom packaging, make sure that file is correct.");
return configurations;
}
可以看到自定义包:found in META-INF/spring.factories
在自定义包的src/main/resource/增加以上META-INF/spring.factories内容
org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.lhx.spring.springboot_enableauto_example.RunnableConfiguration
然后这个包就可以自动被导入了。
public @interface EnableAutoConfiguration { String ENABLED_OVERRIDE_PROPERTY = "spring.boot.enableautoconfiguration"; /**
* Exclude specific auto-configuration classes such that they will never be applied.
* @return the classes to exclude
*/
Class<?>[] exclude() default {}; /**
* Exclude specific auto-configuration class names such that they will never be
* applied.
* @return the class names to exclude
* @since 1.3.0
*/
String[] excludeName() default {}; }
1、ENABLED_OVERRIDE_PROPERTY 配置项:spring.boot.enableautoconfiguration 控制是否启用此注解,可在application.properties中配置。
@Override
protected boolean isEnabled(AnnotationMetadata metadata) {
if (getClass().equals(EnableAutoConfigurationImportSelector.class)) {
return getEnvironment().getProperty(
EnableAutoConfiguration.ENABLED_OVERRIDE_PROPERTY, Boolean.class,
true);
}
return true;
}
2、exclude、excludeName排除
使用:@EnableAutoConfiguration(exclude=UserConfig.class)
@EnableAutoConfiguration(excludeName= {"com.lhx.spring.springboot_enableauto_example.Role"})
1.5版本以后
Deprecated. as of 1.5 in favor of AutoConfigurationImportSelector
DeferredImportSelector
to handle auto-configuration
. This class can also be subclassed if a custom variant of @EnableAutoConfiguration
. is needed.
这里可以看到其实1.5以后是将EnableAutoConfigurationImportSelector 向上提了一个类。
二、spring boot 内部如何使用EnableAutoConfiguration
找到jar:spring-boot-autoconfigure-1.5.9.RELEASE.jar
查看META-INF,其中也存在spring.facetories文件。
# Initializers
org.springframework.context.ApplicationContextInitializer=\
org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer,\
org.springframework.boot.autoconfigure.logging.AutoConfigurationReportLoggingInitializer # 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.OnClassCondition # 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.CloudAutoConfiguration,\
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.CassandraRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration,\
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.jpa.JpaRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.ldap.LdapDataAutoConfiguration,\
org.springframework.boot.autoconfigure.data.ldap.LdapRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,\
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.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.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.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.flyway.FlywayAutoConfiguration,\
org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration,\
org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration,\
org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration,\
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.mobile.DeviceResolverAutoConfiguration,\
org.springframework.boot.autoconfigure.mobile.DeviceDelegatingViewResolverAutoConfiguration,\
org.springframework.boot.autoconfigure.mobile.SitePreferenceAutoConfiguration,\
org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration,\
org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\
org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\
org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\
org.springframework.boot.autoconfigure.reactor.ReactorAutoConfiguration,\
org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration,\
org.springframework.boot.autoconfigure.security.SecurityFilterAutoConfiguration,\
org.springframework.boot.autoconfigure.security.FallbackWebSecurityAutoConfiguration,\
org.springframework.boot.autoconfigure.security.oauth2.OAuth2AutoConfiguration,\
org.springframework.boot.autoconfigure.sendgrid.SendGridAutoConfiguration,\
org.springframework.boot.autoconfigure.session.SessionAutoConfiguration,\
org.springframework.boot.autoconfigure.social.SocialWebAutoConfiguration,\
org.springframework.boot.autoconfigure.social.FacebookAutoConfiguration,\
org.springframework.boot.autoconfigure.social.LinkedInAutoConfiguration,\
org.springframework.boot.autoconfigure.social.TwitterAutoConfiguration,\
org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\
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.DispatcherServletAutoConfiguration,\
org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration,\
org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration,\
org.springframework.boot.autoconfigure.web.HttpEncodingAutoConfiguration,\
org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration,\
org.springframework.boot.autoconfigure.web.MultipartAutoConfiguration,\
org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration,\
org.springframework.boot.autoconfigure.web.WebClientAutoConfiguration,\
org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration,\
org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration,\
org.springframework.boot.autoconfigure.websocket.WebSocketMessagingAutoConfiguration,\
org.springframework.boot.autoconfigure.webservices.WebServicesAutoConfiguration # 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 # 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.JspTemplateAvailabilityProvider
示例:
查看:org.springframework.boot.autoconfigure.gson包
1.看META-INFO/spring.factories中存在
2.查看类GsonAutoConfiguration
@Configuration
@ConditionalOnClass(Gson.class)
public class GsonAutoConfiguration { @Bean
@ConditionalOnMissingBean
public Gson gson() {
return new Gson();
} }
说明:Configuration是一个配置类,ConditionalOnClass(Gson.class)类存在才加载
@ConditionalOnMissingBean,没有才装配,有就以个人装配为准
代码地址:https://github.com/bjlhx15/spring-boot.git 中的 springboot-enable即可
008-Spring Boot @EnableAutoConfiguration深入分析、内部如何使用EnableAutoConfiguration的更多相关文章
- 让你的spring-boot应用日志随心所欲--spring boot日志深入分析
1.spring boot日志概述 spring boot使用Commons Logging作为内部的日志系统,并且给Java Util Logging,Log4J2以及Logback都提供了默认的配 ...
- Spring Boot 面试,一个问题就干趴下了!
最近栈长面试了不少人,其中不乏说对 Spring Boot 非常熟悉的,然后当我问到一些 Spring Boot 核心功能和原理的时候,没人能说得上来,或者说不到点上,可以说一个问题就问趴下了! 这是 ...
- Spring Boot总结
一.Spring Boot 入门 1.Spring Boot 简介 简化Spring应用开发的一个框架: 整个Spring技术栈的一个大整合: J2EE开发的一站式解决方案: 2.微服务 2014,m ...
- spring boot学习1
转:https://blog.csdn.net/jsyxcjw/article/details/46763639 1 开始 1.1 spring介绍 Spring Boot使开发独立的,产品级别的基于 ...
- Spring boot参考指南
介绍 转载自:https://www.gitbook.com/book/qbgbook/spring-boot-reference-guide-zh/details 带目录浏览地址:http://ww ...
- 【Java架构:基础技术】一篇文章搞掂:Spring Boot
本文篇幅较长,建议合理利用右上角目录进行查看(如果没有目录请刷新). 本文是对<Spring Boot 实战第4版>的总结,大家也可以去仔细研读该书 注意,书中使用的Spring Boot ...
- Spring Boot笔记一
Spring Boot 入门 Spring Boot 简介 > 简化Spring应用开发的一个框架:> 整个Spring技术栈的一个大整合:> J2EE开发的一站式解决方案: 微服务 ...
- Spring Boot必备技能之Starter自定义
本文摘自于<Spring Cloud微服务 入门 实战与进阶>一书. 作者:尹吉欢 Spring Boot的方便体现在简化了很多繁琐的配置,对开发人员来说是一个福音,通过引入各种Spri ...
- Spring Boot面试杀手锏————自动配置原理
转:https://blog.csdn.net/u014745069/article/details/83820511 引言不论在工作中,亦或是求职面试,Spring Boot已经成为我们必知必会的技 ...
- Spring Boot 基础,理论,简介
Spring Boot 基础,理论,简介 1.SpringBoot自动装配 1.1 Spring装配方式 1.2 Spring @Enable 模块驱动 1.3 Spring 条件装配 2.自动装配正 ...
随机推荐
- 剑指offer-二叉树中和为某一值的路径-python
题目描述 输入一颗二叉树的跟节点和一个整数,打印出二叉树中结点值的和为输入整数的所有路径.路径定义为从树的根结点开始往下一直到叶结点所经过的结点形成一条路径.(注意: 在返回值的list中,数组长度大 ...
- gp指标信息
RSI: 相对强弱指数,RSI的原理简单来说是以数字计算的方法求出买卖双方的力量对比 强弱指标理论认为,任何市价的大涨或大跌,均在0-100之间变动,根据常态分配 认为RSI值多在30-70之间变动, ...
- windows_vs编译过程
visual studio 2010 编译程序时,首先是cpp经过预处理,处理掉#define,#include等等.#include部分,将头文件部分替换到cpp中.之后进行优化过程,到.s.之后进 ...
- Screen.MousePointer 属性 (访问)
可以使用鼠标指针以及屏幕对象属性可以指定或确定当前显示的鼠标指针的类型.读取/写入的整数. 语法 表达式.MousePointer 表达式 一个代表 Screen 对象的变量. 注解 ...
- P4513 最大连续字段和 (线段树+区间合并)
题目链接:https://www.luogu.org/problem/P4513 题目大意:单点修改和求区间最大连续字段和 解题思路:很容易想到是用线段树来做,但是如何进行维护呢? 每个维护区间 [L ...
- pull request的使用
在git中,不少开发者对自己的提升非常看重,github中的开源项目就是一个非常好的学习资料. github中的开源项目并不是完全正确的,而成为项目贡献者是一件值得骄傲的事情. 所以如何才能对开源项目 ...
- u-boot-2016.09 make编译过程分析(二)
版权声明:本文为博主原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接和本声明.本文链接:https://blog.csdn.net/guyongqiangx/article/ ...
- 正确重写hashCode方法
https://blog.csdn.net/HD243608836/article/details/87367763 到这里,对象写完了,开始描述问题. 计算hashCode的注意事项: 1.不能包含 ...
- window.location对象 获取页面地址
window.location对象的属性: 属性 含义 值 location.protocol 协议 "http://"或"https://" location ...
- 快照方式备份MySQL数据库及举例
快照方式备份MySQL数据库及举例 作者: 红豆殺 日期: 2011 年 03 月 17 日发表评论7条评论查看评论 一.创建逻辑卷 依照如下连接的文档创建一个逻辑卷 http://www.178 ...