实现ApplicationContextAware接口通过ApplicationContext获取bean

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

@Component
public class SpringBeanUtil implements ApplicationContextAware {

    /**
     * Spring应用上下文环境
     */
    private static ApplicationContext applicationContext;

    /**
     * 实现ApplicationContextAware接口的回调方法，设置上下文环境
     *
     * @param applicationContext
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if (SpringBeanUtil.applicationContext == null) {
            synchronized (SpringBeanUtil.class) {
                if (SpringBeanUtil.applicationContext == null) {
                    SpringBeanUtil.applicationContext = applicationContext;
                }
            }
        }
    }

    /**
     * @return ApplicationContext
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 获取对象
     *
     * @param name
     * @throws BeansException
     */
    public static <T> T getBean(String name) {
        return (T) applicationContext.getBean(name);
    }

    /**
     * 获取对象
     *
     * @param clazz
     * @throws BeansException
     */
    public static <T> T getBean(Class<T> clazz) {
        return (T) applicationContext.getBeansOfType(clazz);
    }

    /**
     * 通过name,以及clazz返回指定的Bean
     *
     * @param name
     * @param clazz
     */
    public static <T> T getBean(String name, Class<T> clazz) {
        return applicationContext.getBean(name, clazz);
    }
}