本文介绍了一种在Spring框架中通过Spring上下文手动获取Bean的方法，并提供了一个实用的工具类SpringUtil，该工具类可以帮助开发者在那些无法使用AutoWired和component注解的场景下获取到所需的Bean。
有些场景无法通过AutoWired和compoment注解传递进来，于是希望通过Spring context主动去获取bean
demo:
package com.qhong.Util; import org.springframework.context.ApplicationContext; public class SpringUtil{ private static ApplicationContext applicationContext = null; public static void setApplicationContext(ApplicationContext applicationContext){ if(SpringUtil.applicationContext == null){ SpringUtil.applicationContext = applicationContext; } } //获取applicationContext public static ApplicationContext getApplicationContext() { return applicationContext; } //通过name获取 Bean. public static Object getBean(String name){ return getApplicationContext().getBean(name); } //通过class获取Bean. public static <T> T getBean(Class<T> clazz){ return getApplicationContext().getBean(clazz); } //通过name,以及Clazz返回指定的Bean public static <T> T getBean(String name,Class<T> clazz){ return getApplicationContext().getBean(name, clazz); } }
package com.qhong.Util; import lombok.Data; import lombok.ToString; import org.springframework.stereotype.Component; @Data @ToString @Component public class SpringUtilTest { private String name; private int age; public void show(){ System.out.println(this.toString()); } }
调用：
package com.qhong; import com.qhong.Util.SpringUtil; import com.qhong.Util.SpringUtilTest; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.ApplicationContext; @SpringBootApplication public class SpringBootDemoApplication { public static void main(String[] args) { ApplicationContext ctx= SpringApplication.run(SpringBootDemoApplication.class, args); SpringUtil.setApplicationContext(ctx); String[] beanNames = ctx.getBeanDefinitionNames(); System.out.println("beanNames个数："+beanNames.length); for(String bn:beanNames){ System.out.println(bn); } SpringUtilTest sut=SpringUtil.getBean(SpringUtilTest.class); sut.setAge(31); sut.setName("hongdada"); sut.show(); } }
因为比较懒，就没有创建其他类，直接在main里面运行的。
output:
beanNames个数：177 org.springframework.context.annotation.internalConfigurationAnnotationProcessor org.springframework.context.annotation.internalAutowiredAnnotationProcessor org.springframework.context.annotation.internalRequiredAnnotationProcessor org.springframework.context.annotation.internalCommonAnnotationProcessor org.springframework.context.annotation.internalPersistenceAnnotationProcessor org.springframework.context.event.internalEventListenerProcessor org.springframework.context.event.internalEventListenerFactory springBootDemoApplication org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor org.springframework.context.annotation.ConfigurationClassPostProcessor.enhancedConfigurationProcessor mongodbLog webLogAspect springUtilTest helloController userController org.springframework.boot.autoconfigure.AutoConfigurationPackages org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration org.springframework.boot.autoconfigure.condition.BeanTypeRegistry propertySourcesPlaceholderConfigurer org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration$TomcatWebSocketConfiguration websocketContainerCustomizer org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration$EmbeddedTomcat tomcatEmbeddedServletContainerFactory org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration embeddedServletContainerCustomizerBeanPostProcessor org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration$DispatcherServletConfiguration dispatcherServlet dispatcherServletRegistration spring.mvc.CONFIGURATION_PROPERTIES org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.store org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration error beanNameViewResolver org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration errorAttributes basicErrorController errorPageCustomizer preserveErrorControllerTargetClassPostProcessor org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration requestMappingHandlerAdapter requestMappingHandlerMapping mvcContentNegotiationManager viewControllerHandlerMapping beanNameHandlerMapping resourceHandlerMapping mvcResourceUrlProvider defaultServletHandlerMapping mvcConversionService mvcValidator mvcPathMatcher mvcUrlPathHelper mvcUriComponentsContributor httpRequestHandlerAdapter simpleControllerHandlerAdapter handlerExceptionResolver mvcViewResolver org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter$FaviconConfiguration faviconHandlerMapping faviconRequestHandler org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter defaultViewResolver requestContextFilter viewResolver spring.resources.CONFIGURATION_PROPERTIES org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration hiddenHttpMethodFilter httpPutFormContentFilter org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration mbeanExporter objectNamingStrategy mbeanServer org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration springApplicationAdminRegistrar org.springframework.boot.autoconfigure.aop.AopAutoConfiguration$JdkDynamicAutoProxyConfiguration org.springframework.aop.config.internalAutoProxyCreator org.springframework.boot.autoconfigure.aop.AopAutoConfiguration org.springframework.boot.autoconfigure.transaction.jta.JtaAutoConfiguration spring.jta.CONFIGURATION_PROPERTIES org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$JdbcTemplateConfiguration jdbcTemplate namedParameterJdbcTemplate org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$NonEmbeddedConfiguration dataSource org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$DataSourceInitializerConfiguration dataSourceInitializer org.springframework.boot.autoconfigure.jdbc.metadata.DataSourcePoolMetadataProvidersConfiguration$TomcatDataSourcePoolMetadataProviderConfiguration tomcatPoolDataSourceMetadataProvider org.springframework.boot.autoconfigure.jdbc.metadata.DataSourcePoolMetadataProvidersConfiguration org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration spring.datasource.CONFIGURATION_PROPERTIES dataSourceInitializerPostProcessor org.springframework.boot.autoconfigure.orm.jpa.JpaBaseConfiguration$JpaWebConfiguration$JpaWebMvcConfiguration openEntityManagerInViewInterceptor org.springframework.boot.autoconfigure.orm.jpa.JpaBaseConfiguration$JpaWebConfiguration org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration transactionManager jpaVendorAdapter entityManagerFactoryBuilder entityManagerFactory spring.jpa.CONFIGURATION_PROPERTIES dataSourceInitializedPublisher org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration org.springframework.boot.autoconfigure.dao.PersistenceExceptionTranslationAutoConfiguration persistenceExceptionTranslationPostProcessor org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration org.springframework.data.repository.core.support.RepositoryInterfaceAwareBeanPostProcessor emBeanDefinitionRegistrarPostProcessor jpaMappingContext jpaContext org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration mongo spring.data.mongodb.CONFIGURATION_PROPERTIES org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperBuilderConfiguration jacksonObjectMapperBuilder spring.jackson.CONFIGURATION_PROPERTIES org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperConfiguration jacksonObjectMapper org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration$StringHttpMessageConverterConfiguration stringHttpMessageConverter spring.http.encoding.CONFIGURATION_PROPERTIES org.springframework.boot.autoconfigure.web.JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration mappingJackson2HttpMessageConverter org.springframework.boot.autoconfigure.web.JacksonHttpMessageConvertersConfiguration org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration messageConverters org.springframework.data.web.config.HateoasAwareSpringDataWebConfiguration pageableResolver sortResolver pagedResourcesAssembler pagedResourcesAssemblerArgumentResolver org.springframework.data.web.config.SpringDataJacksonConfiguration jacksonGeoModule org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration$EntityLinksConfiguration entityLinksPluginRegistry controllerEntityLinks delegatingEntityLinks org.springframework.hateoas.config.HateoasConfiguration linkRelationMessageSource org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration$HypermediaConfiguration halObjectMapperConfigurer _halObjectMapper org.springframework.hateoas.config.HypermediaSupportBeanDefinitionRegistrar$DefaultObjectMapperCustomizer#0 org.springframework.hateoas.config.HypermediaSupportBeanDefinitionRegistrar$Jackson2ModuleRegisteringBeanPostProcessor#0 _linkDiscovererRegistry org.springframework.hateoas.LinkDiscoverers#0 defaultRelProvider annotationRelProvider relProviderPluginRegistry _relProvider org.springframework.boot.autoconfigure.hateoas.HypermediaHttpMessageConverterConfiguration halMessageConverterSupportedMediaTypeCustomizer org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration spring.hateoas.CONFIGURATION_PROPERTIES org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration org.springframework.transaction.config.internalTransactionAdvisor transactionAttributeSource transactionInterceptor org.springframework.transaction.config.internalTransactionalEventListenerFactory org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration$TransactionManagementConfiguration org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration transactionTemplate org.springframework.boot.autoconfigure.web.HttpEncodingAutoConfiguration characterEncodingFilter org.springframework.boot.autoconfigure.web.MultipartAutoConfiguration multipartConfigElement multipartResolver multipart.CONFIGURATION_PROPERTIES org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration serverProperties duplicateServerPropertiesDetector org.springframework.orm.jpa.SharedEntityManagerCreator#0 SpringUtilTest(name=hongdada, age=31)
http://blog.youkuaiyun.com/jinzhencs/article/details/51673782
http://blog.youkuaiyun.com/silyvin/article/details/70832415
http://blog.youkuaiyun.com/u014695188/article/details/52396880
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