【Spring】手动获取spring容器对象时，报no qualifying bean of type is defined

手动获取容器对象时，报no qualifying bean of type is defined，

经过调查，发现手动获取的时候，该类所在的包必须经过spring容器初始化。

1.SpringConfigHolder 代码，添加@Component进行ioc

package com.xxxxxxx.utils.holder;

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

/**
 * spring工具类，通过ApplicationContext.getBean获取注册的bean
 *
 */
@Component
public class SpringConfigHolder implements ApplicationContextAware {
    private static ApplicationContext applicationContext;

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

    /**
     * 获取spring的bean
     * */
    public static <T> T getBean(Class<T> clazz) {
        return applicationContext.getBean(clazz);
    }

}

2.配置springmvc-servlet.xml，自动扫描指定包进行ioc

<context:component-scan base-package="com.xxxxxxx.utils.holder" />

3.这样在通过SpringConfigHolder.getBean(XXXX.class)的时候就不会出现no qualifying bean of type is defined了。