[Spring Boot] 根據尚硅谷IT培训学校教程學習1-11

這是Day2，嘗試用中文的教材來理解

 尚硅谷IT培训学校: https://www.youtube.com/watch?v=TAgd4Xbqudc&list=PLmOn9nNkQxJEeIH75s5pdTUnCo9-xOc7c

前置知識:     Spring、SpringMVC、MyBatis

Spring和Spring MVC就是官網的Spring Framework那頁: https://spring.io/projects/spring-framework

導包、寫配置、啟動運行

Servlet容器: Tomcat、    Jetty、Undertow

不用裝Linux

默認配置

外部化配置

RestController: https://github.com/fenturechance/spring-boot-practice-240128/commit/5b231daf2b3a4d119dca33248440b45da789f23f

pom.xml的build的spring-boot-maven-plugin

是為了要讓打包簡單化用的

筆記: IntelliJ的JDK位置: C:\Users\user\.jdks\openjdk-21.0.2\bin

把這串放到Windows的系統環境變數的Path即可

外部化配置application.properties

項目parent: spring-boot-starter-parent

場景: spring-boot-starter-web

主程序: @SpringBootApplication

mvn clean package

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

官方spring-boot-starter-*

第三方 *-spring-boot-starter

application.properties: 集中式管理

官網文件: https://docs.spring.io/spring-boot/docs/current/reference/html/application-properties.html#appendix.application-properties

new module可以加一個新的application

resources裡面的static(靜態資源)、template(頁面模板)

依賴管理

maven依賴傳遞: https://youtu.be/eX-EiudPK9c?si=q7fz06Lq3HtQHKzc

maven就近原則

按右邊的M符號，可以刷新Maven

自動配置機制: https://youtu.be/ut_1gnVdcjQ?si=bbWkNBXnvvcRZyBx

IoC容器

SpringApplication.run(DemoApplication.class, args); //把run點進去後，結果如下

    public static ConfigurableApplicationContext run(Class<?> primarySource, String... args) {

        return run(new Class[]{primarySource}, args);

    }
    
    
    

java 10局部變量自動推斷

        
        var ioc = SpringApplication.run(DemoApplication.class, args);
        String[] names = ioc.getBeanDefinitionNames();
        for (String name: names) {
            System.out.println(name);
        }
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
demoApplication
org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory
appConfig
helloController
testClass1
org.springframework.boot.autoconfigure.AutoConfigurationPackages
org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration
propertySourcesPlaceholderConfigurer
org.springframework.boot.autoconfigure.ssl.SslAutoConfiguration
fileWatcher
sslPropertiesSslBundleRegistrar
sslBundleRegistry
org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor
org.springframework.boot.context.internalConfigurationPropertiesBinder
org.springframework.boot.context.properties.BoundConfigurationProperties
org.springframework.boot.context.properties.EnableConfigurationPropertiesRegistrar.methodValidationExcludeFilter
spring.ssl-org.springframework.boot.autoconfigure.ssl.SslProperties
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
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.TaskExecutorConfigurations$ThreadPoolTaskExecutorBuilderConfiguration
threadPoolTaskExecutorBuilder
org.springframework.boot.autoconfigure.task.TaskExecutorConfigurations$TaskExecutorBuilderConfiguration
taskExecutorBuilder
org.springframework.boot.autoconfigure.task.TaskExecutorConfigurations$SimpleAsyncTaskExecutorBuilderConfiguration
simpleAsyncTaskExecutorBuilder
org.springframework.boot.autoconfigure.task.TaskExecutorConfigurations$TaskExecutorConfiguration
applicationTaskExecutor
org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration
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$EnableWebMvcConfiguration
welcomePageHandlerMapping
welcomePageNotAcceptableHandlerMapping
localeResolver
themeResolver
flashMapManager
mvcConversionService
mvcValidator
mvcContentNegotiationManager
requestMappingHandlerMapping
mvcPatternParser
mvcUrlPathHelper
mvcPathMatcher
viewControllerHandlerMapping
beanNameHandlerMapping
routerFunctionMapping
resourceHandlerMapping
mvcResourceUrlProvider
defaultServletHandlerMapping
requestMappingHandlerAdapter
handlerFunctionAdapter
mvcUriComponentsContributor
httpRequestHandlerAdapter
simpleControllerHandlerAdapter
handlerExceptionResolver
mvcViewResolver
mvcHandlerMappingIntrospector
viewNameTranslator
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$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$JacksonObjectMapperConfiguration
jacksonObjectMapper
org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonMixinConfiguration
jsonMixinModuleEntries
jsonMixinModule
org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration
jsonComponentModule
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$DependsOnDatabaseInitializationPostProcessor
org.springframework.boot.autoconfigure.task.TaskSchedulingConfigurations$ThreadPoolTaskSchedulerBuilderConfiguration
threadPoolTaskSchedulerBuilder
org.springframework.boot.autoconfigure.task.TaskSchedulingConfigurations$TaskSchedulerBuilderConfiguration
taskSchedulerBuilder
org.springframework.boot.autoconfigure.task.TaskSchedulingConfigurations$SimpleAsyncTaskSchedulerBuilderConfiguration
simpleAsyncTaskSchedulerBuilder
org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration
spring.task.scheduling-org.springframework.boot.autoconfigure.task.TaskSchedulingProperties
org.springframework.boot.autoconfigure.web.client.RestClientAutoConfiguration
httpMessageConvertersRestClientCustomizer
restClientSsl
restClientBuilderConfigurer
restClientBuilder
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

SpingApplication只掃描自己和子層的package，除非加上屬性scanBasePackages

自定義掃描路徑

scanBasePackages: https://github.com/fenturechance/spring-boot-practice-240128/commit/34a4c7ef98205222920be0ba4b1fe352268e6c2f

ComponentScan也可以做到一樣的效果

由此文件可知，默認port是8080

https://docs.spring.io/spring-boot/docs/current/reference/html/application-properties.html#application-properties.server.server.port

spring-boot-starter

是所有starter的starter

spring-boot-autoconfigure，config各種場景: cache、kafka....

目前是導入Web，所以Web會生效

產生Getter Setter

On the Code menu, click Generate Alt+Insert.

CTRL + D duplicates the selected line

常用Annotation(包含@import): https://youtu.be/WW_R1veZcr8?si=FbXaubidiN5UeXw7

Scope: prototype: https://github.com/fenturechance/spring-boot-practice-240128/commit/c853fe8de91a8b6d83ad7ae21d60c8d91c437d05

多型

常用Annotation2: https://youtu.be/EraYx170VQs?si=cSzqii0fPwLaaqDb

ConditionalOnClass / ConditionalOnMissingClass

如果有(沒有)這個組件，就放入指定組件: https://github.com/fenturechance/spring-boot-practice-240128/commit/abd21d821c400c13709fccad8d53f10eff1b00d6

IntelliJ: Delete line: Cmd + Y

設定文件為UTF-8，就可以在properties裡面寫中文

抓properties裡面的屬性來創建組件: https://youtu.be/5YmwINwKQ0U?si=BiMv1XQhhlN8gDsd

ConfigurationProperties: https://github.com/fenturechance/spring-boot-practice-240128/commit/ced21c8251b05ef87f5d0acbc2b915ecd27f532f

在容器中註冊組件: @Component / @Bean

IntelliJ

Successively press Alt +J to find and select the next occurrence of case-sensitively matching word or text range.

在AppConfig讓組件自動放入容器

EnableConfigurationProperties: https://github.com/fenturechance/spring-boot-practice-240128/commit/48963609df7c214f94fa6660eccecd3f514edcb8

【尚硅谷】Spring注解驱动教程(雷丰阳源码级讲解): https://www.youtube.com/playlist?list=PLjwE8m3kyOlc4UWESNUjzdyMRvOXrf4Q2

導入流程: https://youtu.be/HtX6pt0hCNs?si=p4yJsav68nDPGR4s

核心場景

spring-boot-autoconfigure

@SpringBootConfiguration //聲明我是個配置類

@EnableAutoConfiguration //開啟自動配置的核心

    @Import給容器中導入組件

    @Import(AutoConfigurationImportSelector.class) 批次給容器導入組件

@ComponentScan //掃描指定包

142個AutoConfigure

C:\Users\user\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\3.2.2\spring-boot-autoconfigure-3.2.2.jar!\META-INF\spring\org.springframework.boot.autoconfigure.AutoConfiguration.imports

自動配置類

按需生效

看Web場景的自動配置做舉例

C:\Users\user\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\3.2.2\spring-boot-autoconfigure-3.2.2.jar!\org\springframework\boot\autoconfigure\web\servlet\DispatcherServletAutoConfiguration.class

給容器中使用@Bean放一堆組件

每個自動配置類都可能有這個註解:  @EnableConfigurationProperties(XXXX.class)

配置文件中的屬性封裝到屬性類中