SpringBoot源码深度解析

艾编程

发布于 2020-06-12 10:34:59

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发布于 2020-06-12 10:34:59

文章被收录于专栏：艾编程艾编程

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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原始发表：2020-05-14 ，如有侵权请联系 cloudcommunity@tencent.com 删除

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