spring cloud config的主函數是ConfigServerApplication，其定義如下：

@Configuration @EnableAutoConfiguration @EnableConfigServer public class ConfigServerApplication {public static void main(String[] args) {new SpringApplicationBuilder(ConfigServerApplication.class).properties("spring.config.name=configserver").run(args);}}

其中

@Configuration是spring定義的注解，使用注解，配置信息的載體由 XML 文件轉移到了 Java 類中。

@EnableAutoConfiguration是spring boot定義的注解，控制spring applicationContext的自動配置的開關。

@EnableConfigServer是spring cloud定義的注解，

@EnableConfigServer定義如下：

@Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Import({ ResourceRepositoryConfiguration.class, EnvironmentRepositoryConfiguration.class, ConfigServerEncryptionConfiguration.class, ConfigServerMvcConfiguration.class }) public @interface EnableConfigServer {}

1.?ResourceRepositoryConfiguration

定義如下：

@Configuration @EnableConfigurationProperties(ConfigServerProperties.class) @ConditionalOnMissingBean(ResourceRepository.class) public class ResourceRepositoryConfiguration {@Bean@ConditionalOnBean(SearchPathLocator.class)public ResourceRepository resourceRepository(SearchPathLocator service) {return new GenericResourceRepository(service);} }

?返回ResourceRepository，其實現類為:GenericResourceRepository,內部服務為SearchPathLocator。實現方法為：

@Overridepublic synchronized Resource findOne(String application, String profile, String label,String path) {String[] locations = this.service.getLocations(application, profile, label).getLocations();try {for (int i = locations.length; i-- > 0;) {String location = locations[i];for (String local : getProfilePaths(profile, path)) {Resource file = this.resourceLoader.getResource(location).createRelative(local);if (file.exists() && file.isReadable()) {return file;}}}}catch (IOException e) {throw new NoSuchResourceException("Error : " + path + ". (" + e.getMessage() + ")");}throw new NoSuchResourceException("Not found: " + path);}

SearchPathLocator定義了搜索資源路徑的策略，其層次結構如下：

2.EnvironmentRepositoryConfiguration

內部定了四種環境的配置

2.1.?NativeEnvironmentRepository

@Configuration@Profile("native")protected static class NativeRepositoryConfiguration {@Autowiredprivate ConfigurableEnvironment environment;@Beanpublic NativeEnvironmentRepository environmentRepository() {return new NativeEnvironmentRepository(this.environment);}}

2.2.?MultipleJGitEnvironmentRepository

@Configuration@ConditionalOnMissingBean(EnvironmentRepository.class)protected static class GitRepositoryConfiguration {@Autowiredprivate ConfigurableEnvironment environment;@Autowiredprivate ConfigServerProperties server;@Beanpublic MultipleJGitEnvironmentRepository environmentRepository() {MultipleJGitEnvironmentRepository repository = new MultipleJGitEnvironmentRepository(this.environment);if (this.server.getDefaultLabel()!=null) {repository.setDefaultLabel(this.server.getDefaultLabel());}return repository;}}

2.3.SvnKitEnvironmentRepository

@Configuration@Profile("subversion")protected static class SvnRepositoryConfiguration {@Autowiredprivate ConfigurableEnvironment environment;@Autowiredprivate ConfigServerProperties server;@Beanpublic SvnKitEnvironmentRepository environmentRepository() {SvnKitEnvironmentRepository repository = new SvnKitEnvironmentRepository(this.environment);if (this.server.getDefaultLabel()!=null) {repository.setDefaultLabel(this.server.getDefaultLabel());}return repository;}}

2.4.VaultEnvironmentRepository

@Configuration@Profile("vault")protected static class VaultConfiguration {@Beanpublic EnvironmentRepository environmentRepository(HttpServletRequest request, EnvironmentWatch watch) {return new VaultEnvironmentRepository(request, watch, new RestTemplate());}}

另外還有，ConfigServerHealthIndicator、ConsulEnvironmentWatch、EnvironmentWatch

3.ConfigServerEncryptionConfiguration

定義了EncryptionController

@Beanpublic EncryptionController encryptionController() {EncryptionController controller = new EncryptionController(this.encryptor);controller.setDefaultApplicationName(this.properties.getDefaultApplicationName());controller.setDefaultProfile(this.properties.getDefaultProfile());return controller;}

4.ConfigServerMvcConfiguration

定義了EnvironmentController和ResourceController

@Beanpublic EnvironmentController environmentController() {EnvironmentController controller = new EnvironmentController(encrypted(), this.objectMapper);controller.setStripDocumentFromYaml(this.server.isStripDocumentFromYaml());return controller;}@Bean@ConditionalOnBean(ResourceRepository.class)public ResourceController resourceController(ResourceRepository repository) {ResourceController controller = new ResourceController(repository,encrypted());return controller;}

支持的協議有三種：

@Overridepublic void configureContentNegotiation(ContentNegotiationConfigurer configurer) {configurer.mediaType("properties", MediaType.valueOf("text/plain"));configurer.mediaType("yml", MediaType.valueOf("text/yaml"));configurer.mediaType("yaml", MediaType.valueOf("text/yaml"));}

?

轉載于:https://www.cnblogs.com/davidwang456/p/5979563.html

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