- 直接注入(Autowired)
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@Configuration public class OAConfig { @Autowired private ApplicationContext applicationContext; @Bean public PersonUtils personUtil(){ boolean bool=applicationContext.containsBean("aa"); System.out.println("containsBean:aa:"+bool); return new PersonUtils(); } } @Component public class User { @Autowired private ApplicationContext applicationContext; }
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- 构造器方法注入
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@Component public class User{ private ApplicationContext applicationContext; public User(ApplicationContext applicationContext) { this.applicationContext = applicationContext; } }
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- 手动构建类实现接口
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/** * Spring的ApplicationContext的持有者,可以用静态方法的方式获取spring容器中的bean * * @author yj * @date 2018年5月27日 下午6:32:11 */ @Component public class SpringContextHolder implements ApplicationContextAware { private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { SpringContextHolder.applicationContext = applicationContext; } public static ApplicationContext getApplicationContext() { assertApplicationContext(); return applicationContext; } @SuppressWarnings("unchecked") public static <T> T getBean(String beanName) { assertApplicationContext(); return (T) applicationContext.getBean(beanName); } public static <T> T getBean(Class<T> requiredType) { assertApplicationContext(); return applicationContext.getBean(requiredType); } private static void assertApplicationContext() { if (SpringContextHolder.applicationContext == null) { throw new RuntimeException("applicaitonContext属性为null,请检查是否注入了SpringContextHolder!"); } } }
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Spring boot 梳理 - SpringBoot中注入ApplicationContext对象的三种方式
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转载自www.cnblogs.com/jiangtao1218/p/10187752.html
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