关于ApplicationContextAware

最近发现一个蛮好玩的类 ApplicationContextAware

可以用来很方的获取spring容器中的类和验证之前关于spring的一些知识

上代码

package com.pobo.liang.ws.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDeFinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * spring上下文配置
 *
 */
@Component
public class SpringContextUtil implements ApplicationContextAware {
    private static Logger logger = LoggerFactory.getLogger(SpringContextUtil.class);
    private static ApplicationContext applicationContext = null;

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtil.applicationContext = applicationContext;
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 注意 bean name默认 = 类名(首字母小写)
     * 例如: A8sClusterDao = getBean("k8sClusterDao")
     *
     * @param name
     * @return
     * @throws BeansException
     */
    public static Object getBean(String name) throws BeansException {
        return applicationContext.getBean(name);
    }
    public static <T> T getBean(String name,Class<T> clazz) throws BeansException {
        return (T) applicationContext.getBean(name);
    }
    public static <T> T getBean(Class<T> clazz) throws BeansException {
        return applicationContext.getBean(clazz);
    }
    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }
    public static boolean isSingleton(String name) throws NoSuchBeanDeFinitionException {
        return applicationContext.isSingleton(name);
    }
}