public void afterPropertiesSet() {if (this.transactionManager == null) {throw new IllegalArgumentException("Property 'transactionManager' is required");}
}

public interface InitializingBean {/*** Invoked by a BeanFactory after it has set all bean properties supplied* (and satisfied BeanFactoryAware and ApplicationContextAware).* <p>This method allows the bean instance to perform initialization only* possible when all bean properties have been set and to throw an* exception in the event of misconfiguration.* @throws Exception in the event of misconfiguration (such* as failure to set an essential property) or if initialization fails.*/void afterPropertiesSet() throws Exception;}

public interface DisposableBean {/*** Invoked by a BeanFactory on destruction of a singleton.* @throws Exception in case of shutdown errors.* Exceptions will get logged but not rethrown to allow* other beans to release their resources too.*/void destroy() throws Exception;}

import org.apache.commons.lang.Validate;
import org.springframework.beans.BeansException;
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;
/*** applicationContext静态化* 使用了ApplicationContextAware接口的类，如果受spring容器管理的* 话，那么就会自动的调用ApplicationContextAware中的setApplicationContext方法* @author Hotusm**/
@Service
@Lazy(false)
public class SpringContextHolder implements ApplicationContextAware,DisposableBean{private static ApplicationContext applicationContext;@Overridepublic void setApplicationContext(ApplicationContext applicationContext)throws BeansException {SpringContextHolder.applicationContext=applicationContext;}//清空applicationContext 设置其为null
    @Overridepublic void destroy() throws Exception {SpringContextHolder.clearHolder();}//获得applicationContextpublic static ApplicationContext getApplicationContext() {//assertContextInjected();return applicationContext;}public static void clearHolder(){applicationContext=null;}//获取Beanpublic static <T> T getBean(Class<T> requiredType){//assertContextInjected();return (T) getApplicationContext().getBean(requiredType);}@SuppressWarnings("unchecked")public static <T> T getBean(String name){assertContextInjected();return (T) getApplicationContext().getBean(name);}//判断application是否为空public static void assertContextInjected(){Validate.isTrue(applicationContext==null, "application未注入 ，请在springContext.xml中注入SpringHolder!");}}