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网站改版意义,wordpress简约清爽主题,制作网页超链接怎么弄,做网站的中标公司SpringBoot的版本控制是怎么做的 starter版本控制 SpringBoot的核心父依赖#xff0c;下面导入的所有starter依赖都不需要指定版本#xff0c;版本默认和spring-boot-starter-parent的parent版本一致#xff1b; xxxstarter内部jar包依赖的版本管理#xff0c;starter自…SpringBoot的版本控制是怎么做的 starter版本控制 SpringBoot的核心父依赖下面导入的所有starter依赖都不需要指定版本版本默认和spring-boot-starter-parent的parent版本一致 xxxstarter内部jar包依赖的版本管理starter自动做好了不会出现冲突也不需要我们操心 parentgroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-parent/artifactIdversion2.6.7/versionrelativePath/ !– lookup parent from repository – /parent所有jar包的依赖的版本追根溯源是spring-boot-dependencies 我们点进去spring-boot-starter-parent会发现这个项目还有自己的父依赖 parentgroupIdorg.springframework.boot/groupIdartifactIdspring-boot-dependencies/artifactIdversion2.6.7/version /parent artifactIdspring-boot-starter-parent/artifactId packagingpom/packaging namespring-boot-starter-parent/name我们继续点进去spring-boot-dependencies会发现这个spring-boot-starter-parent所依赖的所有jar包的版本
spring-boot-dependencies就是SpringBoot的版本仲裁中心 没有被包括在这个文件当中的依赖还是需要写version 自动获取需要扫的包路径获取主启动类的所在包及其子包作为包扫描的参数 SpringBootApplication → EnableAutoConfiguration → AutoConfigurationPackage → Import({AutoConfigurationPackages.Registrar.class}) → 方法public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry) → 选中new PackageImports(metadata)).getPackageNames()右键Evaluate expression 得到如图结果
自动装配bean(约定大于配置) 自动将默认的包名导入一个list中然后根据ConditionalOnxxx注解剔除不需要加载的包最后将需要加载的包的所有bean导入IOC容器 SpringBootApplication → EnableAutoConfiguration → Import({AutoConfigurationImportSelector.class}) → AutoConfigurationImportSelector.class → getCandidateConfigurations(AnnotationMetadata metadata, AnnotationAttributes attributes)方法获取候选配置类全限定类名 → 根据starter和配置文件ConditionalOnxxx注解选择哪些bean被真正装配而哪些被过滤 重点 1. xxxxAutoConfiguration.class帮助我们给容器中自动装配组件一般都带有ConditionalOnxxx注解 2. xxxxProperties配置类与配置文件互相映射同时其中的字段值有默认属性值。所以当配置文件没有值的时候就走默认值反之则走配置文件的值 这就是约定大于配置或者叫约定优于配置 全限定类名被拼接在一个ListString configurations当中 protected ListString getCandidateConfigurations(AnnotationMetadata metadata, AnnotationAttributes attributes) {ListString configurations SpringFactoriesLoader.loadFactoryNames(this.getSpringFactoriesLoaderFactoryClass(), this.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; }protected AutoConfigurationEntry getAutoConfigurationEntry(AnnotationMetadata annotationMetadata) {if (!this.isEnabled(annotationMetadata)) {return EMPTY_ENTRY;} else {AnnotationAttributes attributes this.getAttributes(annotationMetadata);ListString configurations this.getCandidateConfigurations(annotationMetadata, attributes);// 所有候选配置configurations this.removeDuplicates(configurations);// 去重SetString exclusions this.getExclusions(annotationMetadata, attributes);// 根据注解元数据获取需要被排除的this.checkExcludedClasses(configurations, exclusions);// 校验是否真的需要被排除configurations.removeAll(exclusions);configurations this.getConfigurationClassFilter().filter(configurations);// 其他过滤this.fireAutoConfigurationImportEvents(configurations, exclusions);return new AutoConfigurationEntry(configurations, exclusions);// 最终返回} }过滤完成只剩下25个了
最终拼接到一个map当中 private final MapString, AnnotationMetadata entries new LinkedHashMap();SpringBoot启动类run方法的作用 SpringBootApplication注解只是标记作用告诉Spring自动配置和自动导包的内容 实际读取和加载这些事情是run方法做的 run方法代码分析 public static void main(String[] args) {SpringApplication.run(SpringBootWithSpringMvc01Application.class, args); }点进去之后是另一个run方法 public static ConfigurableApplicationContext run(Class? primarySource, String… args) {return run(new Class[]{primarySource}, args); }再点进去是第三个run方法 public static ConfigurableApplicationContext run(Class?[] primarySources, String[] args) {return (new SpringApplication(primarySources)).run(args); }最终的run方法内容 public ConfigurableApplicationContext run(String… args) {long startTime System.nanoTime();DefaultBootstrapContext bootstrapContext this.createBootstrapContext();ConfigurableApplicationContext context null;this.configureHeadlessProperty();SpringApplicationRunListeners listeners this.getRunListeners(args);listeners.starting(bootstrapContext, this.mainApplicationClass);try {ApplicationArguments applicationArguments new DefaultApplicationArguments(args);ConfigurableEnvironment environment this.prepareEnvironment(listeners, bootstrapContext, applicationArguments);this.configureIgnoreBeanInfo(environment);Banner printedBanner this.printBanner(environment);context this.createApplicationContext();context.setApplicationStartup(this.applicationStartup);this.prepareContext(bootstrapContext, context, environment, listeners, applicationArguments, printedBanner);this.refreshContext(context);this.afterRefresh(context, applicationArguments);Duration timeTakenToStartup Duration.ofNanos(System.nanoTime() - startTime);if (this.logStartupInfo) {(new StartupInfoLogger(this.mainApplicationClass)).logStarted(this.getApplicationLog(), timeTakenToStartup);}listeners.started(context, timeTakenToStartup);this.callRunners(context, applicationArguments);} catch (Throwable var12) {this.handleRunFailure(context, var12, listeners);throw new IllegalStateException(var12);}try {Duration timeTakenToReady Duration.ofNanos(System.nanoTime() - startTime);listeners.ready(context, timeTakenToReady);return context;} catch (Throwable var11) {this.handleRunFailure(context, var11, (SpringApplicationRunListeners)null);throw new IllegalStateException(var11);} }核心 this.setInitializers(this.getSpringFactoriesInstances(ApplicationContextInitializer.class));是核心 第三个run方法中SpringApplication的构造方法实际上是创建Spring的配置对象 public SpringApplication(Class?… primarySources) {this((ResourceLoader)null, primarySources); }// 完成了自动装配 public SpringApplication(ResourceLoader resourceLoader, Class?… primarySources) {this.sources new LinkedHashSet();this.bannerMode Mode.CONSOLE;this.logStartupInfo true;this.addCommandLineProperties true;this.addConversionService true;this.headless true;this.registerShutdownHook true;this.additionalProfiles Collections.emptySet();this.isCustomEnvironment false;this.lazyInitialization false;this.applicationContextFactory ApplicationContextFactory.DEFAULT;this.applicationStartup ApplicationStartup.DEFAULT;this.resourceLoader resourceLoader;Assert.notNull(primarySources, PrimarySources must not be null);this.primarySources new LinkedHashSet(Arrays.asList(primarySources));this.webApplicationType WebApplicationType.deduceFromClasspath();this.bootstrapRegistryInitializers new ArrayList(this.getSpringFactoriesInstances(BootstrapRegistryInitializer.class));// 完成读取所有配置初始化的工作this.setInitializers(this.getSpringFactoriesInstances(ApplicationContextInitializer.class));this.setListeners(this.getSpringFactoriesInstances(ApplicationListener.class));this.mainApplicationClass this.deduceMainApplicationClass(); }