Created
March 22, 2019 08:08
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以静态变量保存Spring ApplicationContext
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| import org.apache.commons.lang3.Validate; | |
| import org.slf4j.Logger; | |
| import org.slf4j.LoggerFactory; | |
| import org.springframework.beans.factory.DisposableBean; | |
| import org.springframework.context.ApplicationContext; | |
| import org.springframework.context.ApplicationContextAware; | |
| import org.springframework.context.annotation.Lazy; | |
| import org.springframework.stereotype.Service; | |
| /** | |
| * 类名称:SpringContextHolder | |
| * 类描述:以静态变量保存Spring ApplicationContext | |
| */ | |
| @Service | |
| @Lazy(false) | |
| public class SpringContextHolder implements ApplicationContextAware, DisposableBean { | |
| private static ApplicationContext applicationContext = null; | |
| private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class); | |
| /** | |
| * 取得存储在静态变量中的ApplicationContext. | |
| */ | |
| public static ApplicationContext getApplicationContext() { | |
| assertContextInjected(); | |
| return applicationContext; | |
| } | |
| /** | |
| * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型. | |
| */ | |
| @SuppressWarnings("unchecked") | |
| public static <T> T getBean(String name) { | |
| assertContextInjected(); | |
| return (T) applicationContext.getBean(name); | |
| } | |
| /** | |
| * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型. | |
| */ | |
| public static <T> T getBean(Class<T> requiredType) { | |
| assertContextInjected(); | |
| return applicationContext.getBean(requiredType); | |
| } | |
| /** | |
| * 清除SpringContextHolder中的ApplicationContext为Null. | |
| */ | |
| public static void clearHolder() { | |
| applicationContext = null; | |
| } | |
| /** | |
| * 实现ApplicationContextAware接口, 注入Context到静态变量中. | |
| */ | |
| @Override | |
| public void setApplicationContext(ApplicationContext applicationContext) { | |
| SpringContextHolder.applicationContext = applicationContext; | |
| } | |
| /** | |
| * 实现DisposableBean接口, 在Context关闭时清理静态变量. | |
| */ | |
| @Override | |
| public void destroy() throws Exception { | |
| SpringContextHolder.clearHolder(); | |
| } | |
| /** | |
| * 检查ApplicationContext不为空. | |
| */ | |
| private static void assertContextInjected() { | |
| Validate.validState(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder."); | |
| } | |
| } |
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