实现Spring ApplicationContextAware接口与DisposableBean接口，实现特殊注入

package com.jc.system.common.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

@Component
public class SpringContextHolder implements ApplicationContextAware,
		DisposableBean {

	private static ApplicationContext applicationContext = null;

	private static Logger logger = LoggerFactory
			.getLogger(SpringContextHolder.class);

	
	public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}


	@SuppressWarnings("unchecked")
	public static <T> T getBean(String name) {
		return (T) applicationContext.getBean(name);
	}

	public static <T> T getBean(Class<T> requiredType) {
		return applicationContext.getBean(requiredType);
	}


	public static void clearHolder() {
		logger.debug("清除SpringContextHolder中的ApplicationContext:"
				+ applicationContext);
		applicationContext = null;
	}


	@Override
	public void setApplicationContext(ApplicationContext applicationContext) {
		if (SpringContextHolder.applicationContext != null) {
			logger.warn("SpringContextHolder中的ApplicationContext被覆盖, 原有ApplicationContext为:"
					+ SpringContextHolder.applicationContext);
		}
		SpringContextHolder.applicationContext = applicationContext; // NOSONAR
	}


	@Override
	public void destroy() throws Exception {
		SpringContextHolder.clearHolder();
	}
}