获取spring上下文的bean 工具类

有些场景我们不属于controller，service，dao，但是我们需要从spring中得到spring容器里面的bean。这时候我们需要一个类继承

ApplicationContextAware  实现这个类的set方法，set的参数就是spring的上下文，然后我们就可以  为所欲为了~~~

话不多说，上代码。

ApplicationContextHelper.java

package com.mmall.common;

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

@Component("applicationContextHelper")
public class ApplicationContextHelper implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

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

    public static <T> T popBean(Class<T> clazz) {
        if (applicationContext == null) {
            return null;
        }
        return applicationContext.getBean(clazz);
    }

    public static <T> T popBean(String name, Class<T> clazz) {
        if (applicationContext == null) {
            return null;
        }
        return applicationContext.getBean(name, clazz);
    }
}

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