Spring Bootの本当の理解ポイント #jjug

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基礎を固めよ!


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https://www.casareal.co.jp/ls/service/openseminar/pivotal/p016


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Spring Web 4 Spring MVC

Spring Boot Developer 2 Spring Boot

Spring Cloud Services3

( )

Spring Cloud Microservices


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https://www.casareal.co.jp/ls/service/eventseminar/lineup/fs171130

https://www.casareal.co.jp/ls/service/eventseminar/lineup/fs171130


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Spring Framework

Spring Boot

Spring Cloud

Data, Security, Batch, …


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※CoC : Convention over Configuration ( )

Seasar2 Ruby on Rails


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▸ @Component

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packagehoge.service.impl;

@ComponentpublicclassFooServiceImplimplementsFooService{// }※ ( FooService)


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▸ @Configuration @ComponentScan

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packagehoge.config;

@Configuration@ComponentScan(basePackages={“hoge.service.impl”})publicclassAppConfig{// OK}


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▸ basePackages

@Component

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hoge

config

service

impl

bar

AppConfig

FooServiceImpl

Bar

FooService


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▸ AnnotationConfigApplicationContext

▸ ApplicationContext

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// // ApplicationContextcontext=newAnnotationConfigApplicationContext(AppConfig.class);※ Java Config


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▸ getBean()

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ApplicationContextcontext=…;FooServicefs=context.getBean(FooService.class);


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@Component// publicclassFooController{privatefinalFooServicefs;// @Autowired// publicFooController(FooServicefs){this.fs=fs;}}


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▸ @Bean

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@Configuration//@ComponentScan publicclassAppConfig2{@BeanpublicBarServicebarService(){//

returnnewBarServiceImpl();}}


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▸ @Bean

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@ConfigurationpublicclassAppConfig3{@BeanpublicBarServicebarService(BarRepositorybr){returnnewBarServiceImpl(br);}}

Bean


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▸ @Component

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ApplicationContextcontext=newAnnotationConfigApplicationContext(AppConfig2.class);BarServicebs=context.getBean(BarService.class);

@ComponentpublicclassBarController{privatefinalBarServicebs;@Autowired// publicBarController(BarServicebs){this.bs=bs;}}


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▸ @Bean

▸ basePackages @Component

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@Configuration@ComponentScan(basePackages=“hoge.service.impl”)publicclassAppConfig4{@BeanpublicBarServicebarService(){returnnewBarServiceImpl();}}


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▸ @Component

▸ @Bean

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ViewResolver ※

Spring Spring

DispatcherServlet


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DispatcherServlet

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▸WebApplicationInitialzer

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DispatcherServlet


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▸ DispatcherServlet

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ViewResolver▸

▸ ”employee/index””/WEB-INF/views/employee/index.jsp”

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▸ InternalResourceViewResolver

▸ ThymeleafViewReseolver

▸ FreeMarkerViewResolver

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ViewResolver

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@ConfigurationpublicclassMvcConfig…{@BeanpublicInternalResourceViewResolverviewResolver(){InternalResourceViewResolvervr=newInternalResourceViewResolver();vr.setPrefix("/WEB-INF/views/");vr.setSuffix(".jsp");returnvr;}}


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ViewResolver▸ DispatcherServlet ViewResolver

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https://github.com/spring-projects/spring-framework/blob/master/spring-webmvc/src/main/java/org/springframework/web/servlet/DispatcherServlet.java#L733




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▸ ViewResolver

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▸ ViewResolver

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@EnableW

ebMvc


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@EnableWebMvc▸ @Import

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▸ @EnableXxx

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https://github.com/spring-projects/spring-framework/blob/master/spring-webmvc/src/main/java/org/springframework/web/servlet/config/annotation/EnableWebMvc.java#L101




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▸ @Controller

▸ @Component

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packagehoge.controller

@Controller@RequestMapping(“/employee”)publicclassEmployeeController{@GetMapping(“/index”)publicStringindex(){return“employee/index”;}


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▸ @Component

▸ @Controller

▸ @RestController

▸ @Configuration👈

▸ @Service

▸ @Repository

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@ComponentScan(basePackages=“hoge.controller”)@ConfigurationpublicclassMvcConfig{…}


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@EnableWebMvc@ComponentScan(basePackages=“hoge.controller”)@ConfigurationpublicclassMvcConfig…{@BeanpublicInternalResourceViewResolverviewResolver(){…}}


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DispatcherServlet

ViewResolverBean

Bean

Bean

Bean


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▸ DispatcherServlet

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▸ @EnableWebMvc

▸ @Controller @ComponentScan

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▸ ✕ ✕

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https://www.casareal.co.jp/ls/service/shinjinseminar/course01

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ViewResolverBean

Bean

DataSourceBean

Bean

Bean

Bean

Bean

Bean


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ViewResolverBean

Bean

DataSourceBean

Bean

Bean

Bean

Bean

Bean

Bean

Bean


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@ConfigurationpublicclassThymeleafAutoConfiguration{…@ConfigurationpublicstaticclassXxxConfiguration{@BeanpublicThymeleafViewResolverthymeleafViewResolver(){…}…

※static Java Config

ViewResolver

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafAutoConfiguration.java#L183




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@ConfigurationProperties

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@ConfigurationProperties(prefix=“spring.thymeleaf”)publicclassThymeleafProperties{…privateCharsetencoding=DEFAULT_ENCODING;privatebooleancache=true;// }

spring.thymeleaf.encoding=Shift_JISspring.thymeleaf.cache=falsehttps://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafProperties.java

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafProperties.java

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafProperties.java


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@EnableConfigurationProperties

▸ @ConfigurationProperties

▸ @Component/@Bean

59https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafAutoConfiguration.java#L74

@EnableConfigurationProperties(ThymeleafProperties.class)@ConfigurationpublicclassThymeleafAutoConfiguration{…




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▸ @ConfigurationProperties

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@SpringBootApplicationpublicclassSampleApplication{publicstaticvoidmain(String[]args){SpringApplication.run(SampleApplication.class);}}

@EnableAutoConfiguration@Configuration@ComponentScanpublic@interfaceSpringBootApplication{…


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@EnableAutoConfiguration

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\…

AutoConfiguration

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/spring.factories




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@ConditionalOnXxx

▸ @Bean

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ThymeleafAutoConfiguration

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@Configuration@ConditionalOnClass(TemplateMode.class) @AutoConfigureAfter({WebMvcAutoConfiguration.class,…})publicclassThymeleafAutoConfiguration{…@Configuration@ConditionalOnWebApplication(…)publicstaticclassXxxConfiguration{@Bean@ConditionalOnMissingBean(name=“thymeleafViewResolver”)publicThymeleafViewResolverthymeleafViewResolver(){…https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafAutoConfiguration.java#L183




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@ConditionalOnClass

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@ConditionalOnBean

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@ConditionalOnMissingBean

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@ConditionalOnProperty

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@ConditionalOnWebApplication

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@AutoConfigureAfter/@AutoConfigureBefore

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▸ @EnableAutoConfiguration

▸ @ConditionalOnXxx

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😭

@ConditionalOnMissingBean(Bean_1.class)

@ConditionalOnBean(Bean_2.class)

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Spring Bootのべからず集

一.フレームワークを動かすBeanは、なるべく自前で定義するべからず

二.@EnableXxxはなるべく付けるべからず

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▸ @EnableXxx

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https://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html


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@ConfigurationpublicclassSomeConfiguration{privatefinalSomeBeansb;

@Autowired// publicSomeConfiguration(SomeBeansb){this.sb=sb;}

@PostConstruct// publicvoidinit(){sb.setXxx(…);//SomeBean }}


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@ConfigurationpublicclassMyThymeleafConfiguration{@BeanpublicFooDialectfooDialect(){returnnewFooDialect();}@BeanpublicBarDialectbarDialect(){returnnewBarDialect();}}


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▸ ThymeleafAutoConfiguration Dialect

TemplateEngine Dialect

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FooDialectBean

BarDialectBean

&TemplateEngine

Bean &


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@ConfigurationprotectedstaticclassThymeleafDefaultConfiguration{//Dialect Bean DI publicThymeleafDefaultConfiguration(...,ObjectProvider<Collection<IDialect>>dProvider){…}@BeanpublicSpringTemplateEnginetemplateEngine(){SpringTemplateEngineengine=newSpringTemplateEngine();//Dialect this.dialects.forEach(engine::addDialect);returnengine;https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafAutoConfiguration.java#L140




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▸ XxxCustomizer

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@FunctionalInterfacepublicinterfaceJackson2ObjectMapperBuilderCustomizer{

voidcustomize(Jackson2ObjectMapperBuilderbuilder);}https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jackson/Jackson2ObjectMapperBuilderCustomizer.java

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jackson/Jackson2ObjectMapperBuilderCustomizer.java

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jackson/Jackson2ObjectMapperBuilderCustomizer.java


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@ConfigurationpublicclassMyJacksonConfiguration{@BeanpublicJackson2ObjectMapperBuilderCustomizerjackson2ObjectMapperBuilderCustomizer(){// OKreturnbuilder->{// builder.modules(…).locale(…).indentOutput(…);};}}


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@ConfigurationstaticclassJacksonObjectMapperBuilderConfiguration{@BeanpublicJackson2ObjectMapperBuilder…(List<Jackson2ObjectMapperBuilderCustomizer>customizers){Jackson2ObjectMapperBuilderbuilder=newJackson2ObjectMapperBuilder();for(Jackson2ObjectMapperBuilderCustomizercustomizer:customizers){customizer.customize(builder);}returnbuilder;}}https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration.java#L172

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration.java#L172

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration.java#L172


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▸ FilterRegistrationBean

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@BeanpublicFilterRegistrationBeanmyFilter(){MyFilterfilter=newMyFilter();FilterRegistrationBeanfrb=newFilterRegistrationBean(filter);// url-patternfrb.addUrlPatterns(“/*”);//

frb.setOrder(Ordered.HIGHEST_PRECEDENCE+10);returnfrb;}


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https://speakerdeck.com/masatoshitada/spring-for-spring-boot-number-jsug

https://speakerdeck.com/masatoshitada/spring-for-spring-boot-number-jsug


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https://qiita.com/kazuki43zoo/items/8645d9765edd11c6f1dd

https://blog.ik.am/entries/376


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Technology

Spring Bootの本当の理解ポイント #jjug