• 【SpringBoot从入门到精通】01-SpringBoot 特性

    笔记来源：尚硅谷雷神SpringBoot2零基础入门springboot全套完整版（spring boot2）

    参考笔记：SpringBoot2核心技术与响应式编程 · 语雀 (yuque.com)

    文章目录

    SpringBoot 特性

    1、依赖管理

    1.1、父项目依赖管理

    pom.xml 的父项目 spring-boot-starter-parent

    <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.7.0</version>
</parent>

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    spring-boot-starter-parent 的父项目 spring-boot-dependencies

    <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-dependencies</artifactId>
    <version>2.7.0</version>
</parent>

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    spring-boot-dependencies 中定义了很多依赖

    <dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.apache.activemq</groupId>
            <artifactId>activemq-amqp</artifactId>
            <version>${activemq.version}</version>
        </dependency>
        <!-- ... -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>${aspectj.version}</version>
        </dependency>
        <!-- ... -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <!-- ... -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junit.version}</version>
        </dependency>
        <!-- ... -->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>${logback.version}</version>
        </dependency>
        <!-- ... -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>com.google.protobuf</groupId>
                    <artifactId>protobuf-java</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- ... -->
    </dependencies>
</dependencyManagement>

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    1.2、starter 场景启动器

    SpringBoot 官方支持的场景详见官方文档：

    https://docs.spring.io/spring-boot/docs/current/reference/html/using.html#using.build-systems.starters

    • spring-boot-starter-*：* 代表官方的某种场景
    • *-spring-boot-starter：* 代表三方的某种场景

    引入某种 starter 后，该场景下所有常规所需的依赖都会被自动引入

    01-SpringBoot 特性

    所有场景启动器都有最底层的依赖 spring-boot-starter

    <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
    <version>2.7.0</version>
</dependency>

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    1.3、自动版本仲裁机制

    spring-boot-dependencies 中几乎声明了所有开发中常用的依赖版本号。因此

    • 引入版本仲裁的依赖，默认都可以不写版本号
    • 引入非版本仲裁的依赖，都要写版本号
    <properties>
    <activemq.version>5.16.5</activemq.version>
    <!-- ... -->
    <aspectj.version>1.9.7</aspectj.version>
    <!-- ... -->
    <commons-pool.version>1.6</commons-pool.version>
    <!-- ... -->
    <ehcache.version>2.10.9.2</ehcache.version>
    <!-- ... -->
    <freemarker.version>2.3.31</freemarker.version>
    <!-- ... -->
    <groovy.version>3.0.10</groovy.version>
    <!-- ... -->
    <hibernate.version>5.6.9.Final</hibernate.version>
    <!-- ... -->
    <jersey.version>2.35</jersey.version>
    <!-- ... -->
    <junit.version>4.13.2</junit.version>
    <!-- ... -->
    <log4j2.version>2.17.2</log4j2.version>
    <!-- ... -->
    <mysql.version>8.0.29</mysql.version>
    <!-- ... -->
    <spring-framework.version>5.3.20</spring-framework.version>
    <!-- ... -->
    <thymeleaf.version>3.0.15.RELEASE</thymeleaf.version>
    <!-- ... -->
    <tomcat.version>9.0.63</tomcat.version>
    <!-- ... -->
</properties>

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    • 可以修改版本仲裁的依赖的默认版本号
    <properties>
    <mysql.version>5.1.43</mysql.version>
</properties>
<dependencies>
    <!-- ... -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
</dependencies>

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    刷新依赖关系，会发现 mysql-connector-java 依赖的版本号就会变成修改的版本号

    image-20220622210018213

    2、自动配置

    2.1、Tomcat

    • 自动引入 Tomcat 相关依赖
    • 配置 Tomcat
    <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <version>2.7.0</version>
</dependency>

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    spring-boot-starter-tomcat 中定义了 tomcat 相关依赖

    <dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>9.0.63</version>
    <scope>compile</scope>
    <exclusions>
        <exclusion>
            <artifactId>tomcat-annotations-api</artifactId>
            <groupId>org.apache.tomcat</groupId>
        </exclusion>
    </exclusions>
</dependency>

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    2.2、SpringMVC

    • 自动引入 SpringMVC 全套组件
    • 自动配好 SpringMVC 常用组件（功能）
    <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>2.7.0</version>
</dependency>

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    spring-boot-starter-web 中定义了 springmvc 相关依赖

    <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>5.3.20</version>
    <scope>compile</scope>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.3.20</version>
    <scope>compile</scope>
</dependency>

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    2.3、Web 常见功能

    SpringBoot 帮我们配置好了所有 web 开发的常见场景，如字符编码问题

    Q：如何证明？

    A：打印容器中所有的 bean

    @SpringBootApplication
public class MainApplication
{
    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(MainApplication.class, args);
        String[] beanDefinitionNames = context.getBeanDefinitionNames();
        for (String beanDefinitionName : beanDefinitionNames) {
            System.out.println(beanDefinitionName);
        }
    }
}

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    日志信息

    org.springframework.context.annotation.internalConfigurationAnnotationProcessor
org.springframework.context.annotation.internalAutowiredAnnotationProcessor
org.springframework.context.annotation.internalCommonAnnotationProcessor
org.springframework.context.event.internalEventListenerProcessor
org.springframework.context.event.internalEventListenerFactory
mainApplication
org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory
helloController
org.springframework.boot.autoconfigure.AutoConfigurationPackages
org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration
propertySourcesPlaceholderConfigurer
org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration$TomcatWebSocketConfiguration
websocketServletWebServerCustomizer
org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration
org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryConfiguration$EmbeddedTomcat
tomcatServletWebServerFactory
org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration
servletWebServerFactoryCustomizer
tomcatServletWebServerFactoryCustomizer
org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor
org.springframework.boot.context.internalConfigurationPropertiesBinderFactory
org.springframework.boot.context.internalConfigurationPropertiesBinder
org.springframework.boot.context.properties.BoundConfigurationProperties
org.springframework.boot.context.properties.EnableConfigurationPropertiesRegistrar.methodValidationExcludeFilter
server-org.springframework.boot.autoconfigure.web.ServerProperties
webServerFactoryCustomizerBeanPostProcessor
errorPageRegistrarBeanPostProcessor
org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration$DispatcherServletConfiguration
dispatcherServlet
spring.mvc-org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties
org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration$DispatcherServletRegistrationConfiguration
dispatcherServletRegistration
org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration
org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration
taskExecutorBuilder
applicationTaskExecutor
spring.task.execution-org.springframework.boot.autoconfigure.task.TaskExecutionProperties
org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration
error
beanNameViewResolver
org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration$DefaultErrorViewResolverConfiguration
conventionErrorViewResolver
spring.web-org.springframework.boot.autoconfigure.web.WebProperties
org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration
errorAttributes
basicErrorController
errorPageCustomizer
preserveErrorControllerTargetClassPostProcessor
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfiguration
requestMappingHandlerAdapter
welcomePageHandlerMapping
localeResolver
themeResolver
flashMapManager
mvcConversionService
mvcValidator
mvcContentNegotiationManager
requestMappingHandlerMapping
mvcPatternParser
mvcUrlPathHelper
mvcPathMatcher
viewControllerHandlerMapping
beanNameHandlerMapping
routerFunctionMapping
resourceHandlerMapping
mvcResourceUrlProvider
defaultServletHandlerMapping
handlerFunctionAdapter
mvcUriComponentsContributor
httpRequestHandlerAdapter
simpleControllerHandlerAdapter
handlerExceptionResolver
mvcViewResolver
mvcHandlerMappingIntrospector
viewNameTranslator
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter
defaultViewResolver
viewResolver
requestContextFilter
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration
formContentFilter
org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration
mbeanExporter
objectNamingStrategy
mbeanServer
spring.jmx-org.springframework.boot.autoconfigure.jmx.JmxProperties
org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration
springApplicationAdminRegistrar
org.springframework.boot.autoconfigure.aop.AopAutoConfiguration$ClassProxyingConfiguration
forceAutoProxyCreatorToUseClassProxying
org.springframework.boot.autoconfigure.aop.AopAutoConfiguration
org.springframework.boot.autoconfigure.availability.ApplicationAvailabilityAutoConfiguration
applicationAvailability
org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfiguration
standardJacksonObjectMapperBuilderCustomizer
spring.jackson-org.springframework.boot.autoconfigure.jackson.JacksonProperties
org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperBuilderConfiguration
jacksonObjectMapperBuilder
org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$ParameterNamesModuleConfiguration
parameterNamesModule
org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperConfiguration
jacksonObjectMapper
org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration
jsonComponentModule
jsonMixinModule
org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration
org.springframework.boot.autoconfigure.context.LifecycleAutoConfiguration
lifecycleProcessor
spring.lifecycle-org.springframework.boot.autoconfigure.context.LifecycleProperties
org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration$StringHttpMessageConverterConfiguration
stringHttpMessageConverter
org.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration
mappingJackson2HttpMessageConverter
org.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfiguration
org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration
messageConverters
org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration
spring.info-org.springframework.boot.autoconfigure.info.ProjectInfoProperties
org.springframework.boot.autoconfigure.sql.init.SqlInitializationAutoConfiguration
spring.sql.init-org.springframework.boot.autoconfigure.sql.init.SqlInitializationProperties
org.springframework.boot.sql.init.dependency.DatabaseInitializationDependencyConfigurer$DependsOnDatabaseInitializationPostProcessor
org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration
scheduledBeanLazyInitializationExcludeFilter
taskSchedulerBuilder
spring.task.scheduling-org.springframework.boot.autoconfigure.task.TaskSchedulingProperties
org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration
restTemplateBuilderConfigurer
restTemplateBuilder
org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration$TomcatWebServerFactoryCustomizerConfiguration
tomcatWebServerFactoryCustomizer
org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration
org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration
characterEncodingFilter
localeCharsetMappingsCustomizer
org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration
multipartConfigElement
multipartResolver
spring.servlet.multipart-org.springframework.boot.autoconfigure.web.servlet.MultipartProperties
org.springframework.aop.config.internalAutoProxyCreator

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    可以发现其中有我们非常熟悉的一些功能

    • dispatcherServlet
    • mvcViewResolver
    • characterEncodingFilter
    • multipartResolver

    2.4、默认包扫描

    • 主程序所在包及其下面的所有子包里面的组件都会被默认扫描进来
    • 无需以前的包扫描配置
    • 想要改变扫描路径，@SpringBootApplication(scanBasePackages="xxx") 或者 @ComponentScan 指定扫描路径
    @SpringBootApplication

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    等价于

    @SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan("xxx")

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    2.5、默认配置值

    • 默认端口号：8080

    image-20220624212901812

    • 默认配置最终都是映射到某个类上，如 MultipartProperties

    image-20220624212728818

    • 配置文件的值最终会绑定每个类上，这个类会在容器中创建对象

    image-20220624213102350

    2.6、按需加载

    • 非常多的 starter

    image-20220624213515849

    • 引入了哪些场景，哪些场景的自动配置才会开启
    <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-batch</artifactId>
</dependency>

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    • SpringBoot 所有的自动配置功能都在 spring-boot-autoconfigure 包里面

    image-20220624213822895

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  • 原文地址：https://blog.csdn.net/qq_35925558/article/details/125459714