java框架之SpringBoot(1)-入门
简介
Spring Boot 用来简化 Spring 应用开发，约定大于配置，去繁从简，just run 就能创建一个独立的、产品级别的应用。
背景：
J2EE 笨重的开发、繁多的配置、低下的开发效率、复杂的部署流程、第三方技术集成难度大。
解决：
- “Spring全家桶”时代。
- Spring Boot -> J2EE 一站式解决方案。
- Spring Cloud -> 分布式整体解决方案。
优点：
- 可快速创建独立运行的 Spring 项目以及与主流框架集成。
- 使用嵌入式的 Servlet 容器，应用无需打成 war 包。
- starters 自动依赖于版本控制。
- 大量的自动配置简化了开发，也可修改默认值。
- 无需配置 XML，无代码生成，开箱即用。
- 准生产环境的运行时实时监控。
- 与云计算天然集成。
SpringBoot 官网 | SpringBoot 官方文档 | SpringBoot-2.1.3.RELEASE 源码下载（其它版本直接修改链接版本号即可）
HelloWorld
编码
1、使用 maven 创建一个 java 项目，依赖如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/>
</parent>
<groupId>com.zze.learning</groupId>
<artifactId>springboot_helloworld</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<!--这个插件，可以将应用打包成一个可执行的 jar 包-->
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
pom.xml
2、编写 SpringMVC 控制器：
package com.zze.springboot.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class TestController {
@RequestMapping("/test")
@ResponseBody
public String test(){
return "hello world";
}
}
com.zze.springboot.controller.TestController
3、编写主程序：
package com.zze.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication // 标注一个主程序类，说明这是一个 Spring Boot 应用
public class TestApplication {
public static void main(String[] args) {
// Spring 应用启动
SpringApplication.run(TestApplication.class, args);
}
}
com.zze.springboot.TestApplication
4、执行主程序：
控制台：
浏览器访问 localhost:8080/test：
效果
5、我们还可以通过 maven 将程序打成一个 jar 包，直接通过 java 命令启动：
CMD：
浏览器访问 localhost:8080/test：
效果
这个 HelloWorld 程序也可以使用官网帮助生成，点击使用。
探究
pom文件
父项目
首先，我们引入了一个父项目：
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath/> </parent>而这个父项目也有一个父项目：
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-dependencies</artifactId> <version>2.1.3.RELEASE</version> <relativePath>../../spring-boot-dependencies</relativePath> </parent>这个父项目是真正管理 SpringBoot 应用中的所有依赖版本，它可以称为 SpringBoot 的版本管理中心，所以以后我们导入它管理的依赖是不需要声明版本的。
场景启动器
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>该依赖帮我们导入了 web 模块正常运行所依赖的组件。
spring-boot-starter：SpingBoot 场景启动器。SpringBoot 将所有功能场景都抽取出来，做成一个个 starter （场景启动器），只需要在项目中引入这些 starter 相关场景的所有依赖都会导入进来，要使用什么功能就导入什么场景启动器。下面是 SpringBoot 提供的一些场景启动器：
Name Description Pom spring-boot-starterCore starter, including auto-configuration support, logging and YAML
spring-boot-starter-activemqStarter for JMS messaging using Apache ActiveMQ
spring-boot-starter-amqpStarter for using Spring AMQP and Rabbit MQ
spring-boot-starter-aopStarter for aspect-oriented programming with Spring AOP and AspectJ
spring-boot-starter-artemisStarter for JMS messaging using Apache Artemis
spring-boot-starter-batchStarter for using Spring Batch
spring-boot-starter-cacheStarter for using Spring Framework’s caching support
spring-boot-starter-cloud-connectorsStarter for using Spring Cloud Connectors which simplifies connecting to services in cloud platforms like Cloud Foundry and Heroku
spring-boot-starter-data-cassandraStarter for using Cassandra distributed database and Spring Data Cassandra
spring-boot-starter-data-cassandra-reactiveStarter for using Cassandra distributed database and Spring Data Cassandra Reactive
spring-boot-starter-data-couchbaseStarter for using Couchbase document-oriented database and Spring Data Couchbase
spring-boot-starter-data-couchbase-reactiveStarter for using Couchbase document-oriented database and Spring Data Couchbase Reactive
spring-boot-starter-data-elasticsearchStarter for using Elasticsearch search and analytics engine and Spring Data Elasticsearch
spring-boot-starter-data-jdbcStarter for using Spring Data JDBC
spring-boot-starter-data-jpaStarter for using Spring Data JPA with Hibernate
spring-boot-starter-data-ldapStarter for using Spring Data LDAP
spring-boot-starter-data-mongodbStarter for using MongoDB document-oriented database and Spring Data MongoDB
spring-boot-starter-data-mongodb-reactiveStarter for using MongoDB document-oriented database and Spring Data MongoDB Reactive
spring-boot-starter-data-neo4jStarter for using Neo4j graph database and Spring Data Neo4j
spring-boot-starter-data-redisStarter for using Redis key-value data store with Spring Data Redis and the Lettuce client
spring-boot-starter-data-redis-reactiveStarter for using Redis key-value data store with Spring Data Redis reactive and the Lettuce client
spring-boot-starter-data-restStarter for exposing Spring Data repositories over REST using Spring Data REST
spring-boot-starter-data-solrStarter for using the Apache Solr search platform with Spring Data Solr
spring-boot-starter-freemarkerStarter for building MVC web applications using FreeMarker views
spring-boot-starter-groovy-templatesStarter for building MVC web applications using Groovy Templates views
spring-boot-starter-hateoasStarter for building hypermedia-based RESTful web application with Spring MVC and Spring HATEOAS
spring-boot-starter-integrationStarter for using Spring Integration
spring-boot-starter-jdbcStarter for using JDBC with the HikariCP connection pool
spring-boot-starter-jerseyStarter for building RESTful web applications using JAX-RS and Jersey. An alternative to
spring-boot-starter-webspring-boot-starter-jooqStarter for using jOOQ to access SQL databases. An alternative to
spring-boot-starter-data-jpaorspring-boot-starter-jdbcspring-boot-starter-jsonStarter for reading and writing json
spring-boot-starter-jta-atomikosStarter for JTA transactions using Atomikos
spring-boot-starter-jta-bitronixStarter for JTA transactions using Bitronix
spring-boot-starter-mailStarter for using Java Mail and Spring Framework’s email sending support
spring-boot-starter-mustacheStarter for building web applications using Mustache views
spring-boot-starter-oauth2-clientStarter for using Spring Security’s OAuth2/OpenID Connect client features
spring-boot-starter-oauth2-resource-serverStarter for using Spring Security’s OAuth2 resource server features
spring-boot-starter-quartzStarter for using the Quartz scheduler
spring-boot-starter-securityStarter for using Spring Security
spring-boot-starter-testStarter for testing Spring Boot applications with libraries including JUnit, Hamcrest and Mockito
spring-boot-starter-thymeleafStarter for building MVC web applications using Thymeleaf views
spring-boot-starter-validationStarter for using Java Bean Validation with Hibernate Validator
spring-boot-starter-webStarter for building web, including RESTful, applications using Spring MVC. Uses Tomcat as the default embedded container
spring-boot-starter-web-servicesStarter for using Spring Web Services
spring-boot-starter-webfluxStarter for building WebFlux applications using Spring Framework’s Reactive Web support
spring-boot-starter-websocketStarter for building WebSocket applications using Spring Framework’s WebSocket support
主程序类
package com.zze.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication // 标注一个主程序类，说明这是一个 Spring Boot 应用
public class TestApplication {
public static void main(String[] args) {
// Spring 应用启动
SpringApplication.run(TestApplication.class, args);
}
}
@SpringBootApplication ：标注在某个类上说明这个类是 SpringBoot 的主配置类，SpringBoot 就应该运行这个类的 main 方法来启动 SpringBoot 应用。查看它，发现它其实是一个组合注解：
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(
excludeFilters = {@Filter(
type = FilterType.CUSTOM,
classes = {TypeExcludeFilter.class}
), @Filter(
type = FilterType.CUSTOM,
classes = {AutoConfigurationExcludeFilter.class}
)}
)
public @interface SpringBootApplication {
@SpringBootConfiguration ：标注在某个类上，表示这是一个 SpringBoot 的配置类。而它也是一个组合注解：
@Target({ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) @Documented @Configuration public @interface SpringBootConfiguration {@Configuration ：Spring 配置类上来标注这个注解。它其实是容器中的一个组件：
@Target({ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) @Documented @Component public @interface Configuration {
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@AutoConfigurationPackage
@Import(AutoConfigurationImportSelector.class)
public @interface EnableAutoConfiguration {
- @AutoConfigurationPackage ：自动配置包注解。
@Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Inherited @Import(AutoConfigurationPackages.Registrar.class) public @interface AutoConfigurationPackage {@Import(AutoConfigurationPackages.Registrar.class) ：Spring 底层注解，给容器中导入组件。导入的组件由 AutoConfigurationPackages.Registrar.class 决定，使用这个类会将所标识类（即： com.zze.springboot.TestApplication 类）所在包及子包下的所有类扫描到 Spring 容器。
@Target({ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface Import {
- @Import(AutoConfigurationImportSelector.class) ：Spring 底层注解，给容器中导入组件。 AutoConfigurationImportSelector.class 会将要导入的组件以全类名方式返回，这些组件就会被添加到容器中。最终会给容器中导入很多自动配置类，这些自动配置类的作用就是给容器中导入这个场景需要的所有组件，并配置好这些组件。有了自动配置类，免去了我们手动编写配置注入功能组件等工作。这些自动配置类全路径名放在哪里呢？查看源码会发现，这些类的全路径名是从类路径下 META-INF/spring.factories 中读取。
# Initializers org.springframework.context.ApplicationContextInitializer=\ org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer,\ org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener # 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.OnBeanCondition,\ org.springframework.boot.autoconfigure.condition.OnClassCondition,\ org.springframework.boot.autoconfigure.condition.OnWebApplicationCondition # 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.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.reactor.core.ReactorCoreAutoConfiguration,\ org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration,\ org.springframework.boot.autoconfigure.security.servlet.SecurityRequestMatcherProviderAutoConfiguration,\ 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.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.WebServiceTemplateAutoConfiguration # 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,\ org.springframework.boot.autoconfigure.session.NonUniqueSessionRepositoryFailureAnalyzer # 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.servlet.JspTemplateAvailabilityProvider
spring-boot-autoconfigure-2.1.3.RELEASE.jar!/META-INF/spring.factories
J2EE的整体解决方案和自动配置都在 spring-boot-autoconfigure-2.1.3.RELEASE.jar 中。
Spring Initializr
IDE 都支持使用 Spring 的项目创建向导快速创建一个 SpringBoot 项目（需联网环境下）。下面以 IDEA 为例。
使用
1、新建模块，选中 “Spring Initializr” 项：
2、输入坐标，默认选择 “Maven Project”：
3、可直接勾选要导入的场景：
4、点击“Finish”，完成：
目录结构
默认生成的 SpringBoot 项目：
- 主程序已经生成好了，我们只需要编写需要的逻辑。
- resources 文件夹中目录结构：
static：保存所有的静态资源，例如：js、css、images 等。 templates：保存所有的模板页面；（SpringBoot 以 jar 包方式嵌入Tomcat，默认不支持 JSP 页面，可使用模板引擎如：freemarker、thymeleaf）。 application.properties：SpringBoot 应用的配置文件，可以修改一些默认设置。
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