不用注解,获取spring容器里的bean(ApplicaitonContext)
以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext.
使用方法:SpringContextHolder.getBean(NetVideoDao.class);
package com.sh.csv.util; 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; /** * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext. * * */ @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() { if (logger.isDebugEnabled()) { logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext); } 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."); } }