ApplicationContextAware接口

package com.centit.bajc.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class SpringBeanFactoryUtils implements ApplicationContextAware {

	private static ApplicationContext context;

	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		context = applicationContext;
	}

	/**
	 * 取得存储在静态变量中的ApplicationContext.
	 */
	public static ApplicationContext getApplicationContext() {
		checkApplicationContext();
		return context;
	}

	/**
	 * 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 getBean(String name) {
		checkApplicationContext();
		return (T) context.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.
	 */
	@SuppressWarnings("unchecked")
	public static  T getBean(Class clazz) {
		checkApplicationContext();
		return (T) context.getBeansOfType(clazz);
	}

	/**
	 * 清除applicationContext静态变量.
	 */
	public static void cleanApplicationContext() {
		context = null;
	}

	private static void checkApplicationContext() {
		if (context == null) {
			throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder");
		}
	}

}