SpringBoot常用配置簡介

1. SpringBoot中幾個常用的配置的簡單介紹

• 一個簡單的Spring.factories

  # Bootstrap components org.springframework.cloud.bootstrap.BootstrapConfiguration=\ org.springframework.cloud.config.server.bootstrap.ConfigServerBootstrapConfiguration# Application listeners org.springframework.context.ApplicationListener=\ org.springframework.cloud.config.server.bootstrap.ConfigServerBootstrapApplicationListener # Autoconfiguration org.springframework.boot.autoconfigure.EnableAutoConfiguration=\ org.springframework.cloud.config.server.config.EncryptionAutoConfiguration,\ org.springframework.cloud.config.server.config.SingleEncryptorAutoConfiguration

• BootstrapConfiguration簡介
  Spring.factories中的配置項， org.springframework.cloud.bootstrap.BootstrapConfiguration，會在Spring啟動之前的準備上下文階段將其加入到容器中。我們在介紹?@Configuration配置解析一文中曾詳細解釋Configuration中的解析。BootstrapConfiguration是在刷新（refresh）階段將class作為預選的配置類@Configuration注入到容器中的，在@Configuration配置解析階段會解析此class。

• 加載BootstrapConfiguration配置的類

  List<String> names = SpringFactoriesLoader.loadFactoryNames(BootstrapConfiguration.class, classLoader);for (String name : StringUtils.commaDelimitedListToStringArray(environment.getProperty("spring.cloud.bootstrap.sources", ""))) {names.add(name);}// TODO: is it possible or sensible to share a ResourceLoader?SpringApplicationBuilder builder = new SpringApplicationBuilder().profiles(environment.getActiveProfiles()).bannerMode(Mode.OFF).environment(bootstrapEnvironment).properties("spring.application.name:" + configName).registerShutdownHook(false).logStartupInfo(false).web(false);List<Class<?>> sources = new ArrayList<>();for (String name : names) {Class<?> cls = ClassUtils.resolveClassName(name, null);try {cls.getDeclaredAnnotations();}catch (Exception e) {continue;}sources.add(cls);}builder.sources(sources.toArray(new Class[sources.size()]));AnnotationAwareOrderComparator.sort(sources);final ConfigurableApplicationContext context = builder.run();

• 加載BootstrapConfiguration配置的類

  private void prepareContext(ConfigurableApplicationContext context,ConfigurableEnvironment environment, SpringApplicationRunListeners listeners,ApplicationArguments applicationArguments, Banner printedBanner) {context.setEnvironment(environment);postProcessApplicationContext(context);applyInitializers(context);listeners.contextPrepared(context);if (this.logStartupInfo) {logStartupInfo(context.getParent() == null);logStartupProfileInfo(context);} // Add boot specific singleton beanscontext.getBeanFactory().registerSingleton("springApplicationArguments",applicationArguments);if (printedBanner != null) {context.getBeanFactory().registerSingleton("springBootBanner", printedBanner);}// Load the sourcesSet<Object> sources = getSources();//獲取需要加載的class源Assert.notEmpty(sources, "Sources must not be empty");load(context, sources.toArray(new Object[sources.size()]));//加載classlisteners.contextLoaded(context);}

• ApplicationListener簡介
  org.springframework.context.ApplicationListener會在SpringBoot中幾個典型事件產生后調用onApplicationEvent方法。詳見Spring事件發布系統。

• Autoconfiguration簡介
  org.springframework.boot.autoconfigure.EnableAutoConfiguration是SpringBoot中最常見配置，用于自動配置。只要有@EnableAutoConfiguration注解，該配置的所有類都會自動加載到Spring容器中。

沒有智能的代碼，源碼面前了無秘密

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