Spring开源框架，解决企业级开发的复杂性的问题，简化开发AOP， IOCSpring 配置越来多，配置不方便管理！
Javaweb---Servlet+tomcat + Struct2 SpringMVC SPRINGboot.....
所有的技术框架：从一个复杂的场景慢慢的衍生出来一种规范！简单的配置！
==SpringBoot ：自动配置！==
Springboot怎么自动配置，核心原理！当之无愧的Java领域最热门的技术！公司，怎么演进架构！
1、 版本控制
资源控制
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
资源控制
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.2.1.RELEASE</version>
<relativePath>../../spring-boot-dependencies</relativePath>
</parent>
<properties>
<activemq.version>5.15.10</activemq.version>
<antlr2.version>2.7.7</antlr2.version>
<appengine-sdk.version>1.9.76</appengine-sdk.version>
<artemis.version>2.10.1</artemis.version>
<aspectj.version>1.9.4</aspectj.version>
<assertj.version>3.13.2</assertj.version>
<atomikos.version>4.0.6</atomikos.version>
<awaitility.version>4.0.1</awaitility.version>
<bitronix.version>2.1.4</bitronix.version>
<build-helper-maven-plugin.version>3.0.0</build-helper-maven-plugin.version>
<byte-buddy.version>1.10.2</byte-buddy.version>
<caffeine.version>2.8.0</caffeine.version>
<cassandra-driver.version>3.7.2</cassandra-driver.version>
<classmate.version>1.5.1</classmate.version>
<commons-codec.version>1.13</commons-codec.version>
<commons-dbcp2.version>2.7.0</commons-dbcp2.version>
<commons-lang3.version>3.9</commons-lang3.version>
<commons-pool.version>1.6</commons-pool.version>
<commons-pool2.version>2.7.0</commons-pool2.version>
<couchbase-cache-client.version>2.1.0</couchbase-cache-client.version>
<couchbase-client.version>2.7.9</couchbase-client.version>
<db2-jdbc.version>11.5.0.0</db2-jdbc.version>
<dependency-management-plugin.version>1.0.8.RELEASE</dependency-management-plugin.version>
<derby.version>10.14.2.0</derby.version>
<dropwizard-metrics.version>4.1.1</dropwizard-metrics.version>
<ehcache.version>2.10.6</ehcache.version>
<ehcache3.version>3.8.1</ehcache3.version>
<elasticsearch.version>6.8.4</elasticsearch.version>
<embedded-mongo.version>2.2.0</embedded-mongo.version>
<exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
<flatten-maven-plugin.version>1.1.0</flatten-maven-plugin.version>
<flyway.version>6.0.8</flyway.version>
<freemarker.version>2.3.29</freemarker.version>
<git-commit-id-plugin.version>3.0.1</git-commit-id-plugin.version>
<glassfish-el.version>3.0.3</glassfish-el.version>
<glassfish-jaxb.version>2.3.2</glassfish-jaxb.version>
<groovy.version>2.5.8</groovy.version>
<gson.version>2.8.6</gson.version>
<h2.version>1.4.200</h2.version>
<hamcrest.version>2.1</hamcrest.version>
<hazelcast.version>3.12.4</hazelcast.version>
<hazelcast-hibernate5.version>1.3.2</hazelcast-hibernate5.version>
<hibernate.version>5.4.8.Final</hibernate.version>
<hibernate-validator.version>6.0.18.Final</hibernate-validator.version>
<hikaricp.version>3.4.1</hikaricp.version>
<hsqldb.version>2.5.0</hsqldb.version>
<htmlunit.version>2.36.0</htmlunit.version>
<httpasyncclient.version>4.1.4</httpasyncclient.version>
<httpclient.version>4.5.10</httpclient.version>
<httpcore.version>4.4.12</httpcore.version>
<infinispan.version>9.4.16.Final</infinispan.version>
<influxdb-java.version>2.15</influxdb-java.version>
<jackson.version>2.10.0</jackson.version>
<jackson-bom.version>${jackson.version}</jackson-bom.version>
<jakarta-activation.version>1.2.1</jakarta-activation.version>
<jakarta-annotation.version>1.3.5</jakarta-annotation.version>
<jakarta-jms.version>2.0.3</jakarta-jms.version>
<jakarta-json.version>1.1.6</jakarta-json.version>
<jakarta-json-bind.version>1.0.2</jakarta-json-bind.version>
<jakarta-mail.version>1.6.4</jakarta-mail.version>
<jakarta-persistence.version>2.2.3</jakarta-persistence.version>
<jakarta-servlet.version>4.0.3</jakarta-servlet.version>
<jakarta-servlet-jsp.version>2.3.5</jakarta-servlet-jsp.version>
<jakarta-servlet-jsp-jstl.version>1.2.7</jakarta-servlet-jsp-jstl.version>
<jakarta-transaction.version>1.3.3</jakarta-transaction.version>
<jakarta-validation.version>2.0.1</jakarta-validation.version>
<jakarta-websocket.version>1.1.2</jakarta-websocket.version>
<jakarta-ws-rs.version>2.1.6</jakarta-ws-rs.version>
<jakarta-xml-bind.version>2.3.2</jakarta-xml-bind.version>
<jakarta-xml-ws.version>2.3.2</jakarta-xml-ws.version>
<janino.version>3.1.0</janino.version>
<javax-activation.version>1.2.0</javax-activation.version>
<javax-annotation.version>1.3.2</javax-annotation.version>
<javax-cache.version>1.1.1</javax-cache.version>
<javax-jaxb.version>2.3.1</javax-jaxb.version>
<javax-jaxws.version>2.3.1</javax-jaxws.version>
<javax-jms.version>2.0.1</javax-jms.version>
<javax-json.version>1.1.4</javax-json.version>
<javax-jsonb.version>1.0</javax-jsonb.version>
<javax-mail.version>1.6.2</javax-mail.version>
<javax-money.version>1.0.3</javax-money.version>
<javax-persistence.version>2.2</javax-persistence.version>
<javax-transaction.version>1.3</javax-transaction.version>
<javax-validation.version>2.0.1.Final</javax-validation.version>
<javax-websocket.version>1.1</javax-websocket.version>
<jaxen.version>1.2.0</jaxen.version>
<jaybird.version>3.0.6</jaybird.version>
<jboss-logging.version>3.4.1.Final</jboss-logging.version>
<jboss-transaction-spi.version>7.6.0.Final</jboss-transaction-spi.version>
<jdom2.version>2.0.6</jdom2.version>
<jedis.version>3.1.0</jedis.version>
<jersey.version>2.29.1</jersey.version>
<jest.version>6.3.1</jest.version>
<jetty.version>9.4.22.v20191022</jetty.version>
<jetty-el.version>8.5.40</jetty-el.version>
<jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
<jetty-reactive-httpclient.version>1.0.3</jetty-reactive-httpclient.version>
<jmustache.version>1.15</jmustache.version>
<jna.version>4.5.2</jna.version>
<joda-time.version>2.10.5</joda-time.version>
<johnzon.version>${johnzon-jsonb.version}</johnzon.version>
<johnzon-jsonb.version>1.2.1</johnzon-jsonb.version>
<jolokia.version>1.6.2</jolokia.version>
<jooq.version>3.12.3</jooq.version>
<jsonassert.version>1.5.0</jsonassert.version>
<json-path.version>2.4.0</json-path.version>
<jstl.version>1.2</jstl.version>
<jtds.version>1.3.1</jtds.version>
<junit.version>4.12</junit.version>
<junit-jupiter.version>5.5.2</junit-jupiter.version>
<kafka.version>2.3.1</kafka.version>
<kotlin.version>1.3.50</kotlin.version>
<kotlin-coroutines.version>1.3.2</kotlin-coroutines.version>
<lettuce.version>5.2.1.RELEASE</lettuce.version>
<liquibase.version>3.8.0</liquibase.version>
<log4j2.version>2.12.1</log4j2.version>
<logback.version>1.2.3</logback.version>
<lombok.version>1.18.10</lombok.version>
<mariadb.version>2.4.4</mariadb.version>
<maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
<maven-assembly-plugin.version>3.1.1</maven-assembly-plugin.version>
<maven-clean-plugin.version>3.1.0</maven-clean-plugin.version>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<maven-dependency-plugin.version>3.1.1</maven-dependency-plugin.version>
<maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
<maven-enforcer-plugin.version>3.0.0-M2</maven-enforcer-plugin.version>
<maven-failsafe-plugin.version>2.22.2</maven-failsafe-plugin.version>
<maven-help-plugin.version>3.2.0</maven-help-plugin.version>
<maven-install-plugin.version>2.5.2</maven-install-plugin.version>
<maven-invoker-plugin.version>3.2.1</maven-invoker-plugin.version>
<maven-jar-plugin.version>3.1.2</maven-jar-plugin.version>
<maven-javadoc-plugin.version>3.1.1</maven-javadoc-plugin.version>
<maven-resources-plugin.version>3.1.0</maven-resources-plugin.version>
<maven-shade-plugin.version>3.2.1</maven-shade-plugin.version>
<maven-site-plugin.version>3.8.2</maven-site-plugin.version>
<maven-source-plugin.version>3.1.0</maven-source-plugin.version>
<maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
<maven-war-plugin.version>3.2.3</maven-war-plugin.version>
<micrometer.version>1.3.1</micrometer.version>
<mimepull.version>1.9.12</mimepull.version>
<mockito.version>3.1.0</mockito.version>
<mongodb.version>3.11.2</mongodb.version>
<mongo-driver-reactivestreams.version>1.12.0</mongo-driver-reactivestreams.version>
<mssql-jdbc.version>7.4.1.jre8</mssql-jdbc.version>
<mysql.version>8.0.18</mysql.version>
<nekohtml.version>1.9.22</nekohtml.version>
<neo4j-ogm.version>3.2.2</neo4j-ogm.version>
<netty.version>4.1.43.Final</netty.version>
<netty-tcnative.version>2.0.26.Final</netty-tcnative.version>
<nio-multipart-parser.version>1.1.0</nio-multipart-parser.version>
<ojdbc.version>19.3.0.0</ojdbc.version>
<okhttp3.version>3.14.4</okhttp3.version>
<pooled-jms.version>1.0.6</pooled-jms.version>
<postgresql.version>42.2.8</postgresql.version>
<prometheus-pushgateway.version>0.7.0</prometheus-pushgateway.version>
<quartz.version>2.3.2</quartz.version>
<querydsl.version>4.2.1</querydsl.version>
<rabbit-amqp-client.version>5.7.3</rabbit-amqp-client.version>
<reactive-streams.version>1.0.3</reactive-streams.version>
<reactor-bom.version>Dysprosium-SR1</reactor-bom.version>
<rest-assured.version>3.3.0</rest-assured.version>
<rsocket.version>1.0.0-RC5</rsocket.version>
<rxjava.version>1.3.8</rxjava.version>
<rxjava2.version>2.2.14</rxjava2.version>
<rxjava-adapter.version>1.2.1</rxjava-adapter.version>
<saaj-impl.version>1.5.1</saaj-impl.version>
<selenium.version>3.141.59</selenium.version>
<selenium-htmlunit.version>2.36.0</selenium-htmlunit.version>
<sendgrid.version>4.4.1</sendgrid.version>
<servlet-api.version>4.0.1</servlet-api.version>
<slf4j.version>1.7.29</slf4j.version>
<snakeyaml.version>1.25</snakeyaml.version>
<solr.version>8.2.0</solr.version>
<spring-amqp.version>2.2.1.RELEASE</spring-amqp.version>
<spring-batch.version>4.2.0.RELEASE</spring-batch.version>
<spring-cloud-connectors.version>2.0.6.RELEASE</spring-cloud-connectors.version>
<spring-data-releasetrain.version>Moore-SR1</spring-data-releasetrain.version>
<spring-framework.version>5.2.1.RELEASE</spring-framework.version>
<spring-hateoas.version>1.0.1.RELEASE</spring-hateoas.version>
<spring-integration.version>5.2.1.RELEASE</spring-integration.version>
<spring-kafka.version>2.3.3.RELEASE</spring-kafka.version>
<spring-ldap.version>2.3.2.RELEASE</spring-ldap.version>
<spring-restdocs.version>2.0.4.RELEASE</spring-restdocs.version>
<spring-retry.version>1.2.4.RELEASE</spring-retry.version>
<spring-security.version>5.2.1.RELEASE</spring-security.version>
<spring-session-bom.version>Corn-RELEASE</spring-session-bom.version>
<spring-ws.version>3.0.8.RELEASE</spring-ws.version>
<sqlite-jdbc.version>3.28.0</sqlite-jdbc.version>
<sun-mail.version>${jakarta-mail.version}</sun-mail.version>
<thymeleaf.version>3.0.11.RELEASE</thymeleaf.version>
<thymeleaf-extras-data-attribute.version>2.0.1</thymeleaf-extras-data-attribute.version>
<thymeleaf-extras-java8time.version>3.0.4.RELEASE</thymeleaf-extras-java8time.version>
<thymeleaf-extras-springsecurity.version>3.0.4.RELEASE</thymeleaf-extras-springsecurity.version>
<thymeleaf-layout-dialect.version>2.4.1</thymeleaf-layout-dialect.version>
<tomcat.version>9.0.27</tomcat.version>
<unboundid-ldapsdk.version>4.0.12</unboundid-ldapsdk.version>
<undertow.version>2.0.27.Final</undertow.version>
<versions-maven-plugin.version>2.7</versions-maven-plugin.version>
<webjars-hal-browser.version>3325375</webjars-hal-browser.version>
<webjars-locator-core.version>0.41</webjars-locator-core.version>
<wsdl4j.version>1.6.3</wsdl4j.version>
<xml-maven-plugin.version>1.0.2</xml-maven-plugin.version>
<xmlunit2.version>2.6.3</xmlunit2.version>
</properties>
pom.xml 就是springboot的版本控制中心！
假设里面有默认的配置，我们就不需手动配置版本了，假设没有，我们才需要手动配置！
2、 启动器
package com.example.demo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; //程序的主入口 @SpringBootApplication //Springboot应用 public class DemoApplication { public static void main(String[] args) { //开启了一个服务！ SpringApplication.run(DemoApplication.class, args); } }
applicationContext.xml == @Configuration
bean == @Bean
import == @Import
所有的包，必须在主启动类的同级或子级目录！为什么？
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; }
# 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.elasticsearch.ReactiveElasticsearchRepositoriesAutoConfiguration, org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveRestClientAutoConfiguration, 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.rsocket.RSocketMessagingAutoConfiguration, org.springframework.boot.autoconfigure.rsocket.RSocketRequesterAutoConfiguration, org.springframework.boot.autoconfigure.rsocket.RSocketServerAutoConfiguration, org.springframework.boot.autoconfigure.rsocket.RSocketStrategiesAutoConfiguration, org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration, 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.security.rsocket.RSocketSecurityAutoConfiguration, org.springframework.boot.autoconfigure.security.saml2.Saml2RelyingPartyAutoConfiguration, 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.WebServiceTemplateA
在springboot已启动，它就自动帮我们配置了以上全部的类！但是真的都生效的了？
WebMvcAutoConfiguration.xml
bean
怎么自动配置的？
3、SpringApplication
-
推断我们的应用是web应用还是 普通应用！
-
加载初始化！
-
设置监听器
-
推断main方法，找到运行的主类
run方法（）核心！
4、YAML
但为了强调这种语言以数据做为中心
字面量键值对：
k: (空格) value
对象，map
# 语法 k: v1: v2: # 例子 student: name: coding age: 3 student: {name: coding, age: 3}
数组（List，Set）
#语法 pets: - cat - dog - pig pets: [cat,dog,pig]
@ConfigurationProperties ：SpringBoot自动配置底层全部都是这个注解
精髓
@ConditionalOnXXX根据这个类中不同的条件判断这个类是否生效！
-
一旦这个配置类生效，这个配置类就会往容器中添加各种组件！
-
这些个组件，都可以和xxxProerties绑定，而 xxProerties @ConfigurationProperties 和我们的配置文件绑定，所以说，我们只需要少量配置就可以实现功能了，假设不配置，就会使用springboot 的默认配置
-
Springboot中存在大量自动动配置类
但是这些类不一定生效！ @ConditionalOnXXX
-
xxxAutoConfiguration，自动配置类
-
xxxProperties,配置类 @ConfigurationProperties 组合
-
实现和我们的配置一一对应，我们假设没有配置就使用自动配置，如果配置了，就使用我们自动配置的！
架构演进推演
聊聊过去和未来！
三层架构 mvc 架构---> 结构 开发框架 Spring IOC：控制反转思想 DI 约泡： 泡温泉，泡茶，。。。。泡友 附近的人，打招呼，加微信，聊聊天天聊,,,,,约泡 手动实现，一步步new 浴场： 温泉，茶庄的... 容器（get 拿） 直接有泡友了！ 原来需要一步步自己去操作，现在交个容器了，我们需要什么区拿就可以了！ AOP： 面向切面 (动态代理) 不影响原来业务的情况下，动态增加功能，日志，事务，安全///. 解决企业开发的复杂性 Spring 春天，简化了开发，随着时间的推移，开始慢慢的复杂起来，配置文件变多！ SpringBoot SpringBoot 并不是新的东西，就是Spring升级版！ 新一代JavaEE开发标准，开箱即用！ 自动配置=====核心原理！ 约定大于配置 单体架构 all in one 微服务架构---新架构 模块化，功能化！ 代码没有变化，网络问题 微服务架构的问题？ 4步曲 1. 这么多服务，客户端如何去访问？ 2. 这么多服务，服务之间如何通信？ 3. 这么多服务，怎么治理？ 4. 这么多服务，服务挂了怎么办？ SpringCloud， 生态., 解决方案： 1. Spring Cloud Netflix 一站式解决方案 api：----zuul Feign---》 HttpClient =-- Http 的同学方式，同步并阻塞 服务注册与发现====》Eureka 熔断机制====》Hystrix Netflix 2018,宣布无限期停止维护！ 2. Apache Dubbo + Zookeeper 不完善！ API；没有 借助别人的或者自己写 Dubbo：异步非阻塞 RPC 服务注册与发现： Zookeeper （Hadoop,Hive。。。） 熔断机制没有。借助 Hystrix 3. Spring Cloud Alibaba 一站式解决方案！ 目前又推出新一代的服务网格概念 下一代的服务标准： Server Mesh 服务网格 Istio：未来需要掌握 1 1.8 裁员对于优秀的人来说是好事！ 万变不离其宗！一通百通！ 1. 这么多服务，客户端如何去访问？ 2. 这么多服务，服务之间如何通信？ 3. 这么多服务，怎么治理？ 4. 这么多服务，服务挂了怎么办？ 如果你们机遇这些问题，开发出来一套解决方案！ 投资自己 为什么要解决这问题： 本质： 网络是不可靠的！ 高级程序猿 程序猿---项目经理---架构师----CTO---CEO 架构：设计出来，衍生出来的！ 架是一个逐步演进的过程！架构没有最好的，只有最合适！ ----------------------- 当下进阶的一个任务！ 1、 定义当前企业的架构，所处的阶段，绘制出一个架构图（完成） 2、 清晰定位当前公司的一个状况！根据企业的实际情况绘制出新的架构图（重构！） 分布式 高可用 集群 负载均衡 .....
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