SpringBoot如何获取IOC容器以及修改Bean

通过ApplicationContextAware来获得ApplicationContext，然后获取相关Bean进行操作
举例说明

@Configuration
public class CommonConfig implements ApplicationContextAware {
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        // 获取RabbitTemplate
        RabbitTemplate rabbitTemplate = applicationContext.getBean(RabbitTemplate.class);
        // 设置ReturnCallback
        rabbitTemplate.setReturnCallback((message, replyCode, replyText, exchange, routingKey) -> {
            // 投递失败，记录日志
            log.info("消息发送失败，应答码{}，原因{}，交换机{}，路由键{},消息{}",
                     replyCode, replyText, exchange, routingKey, message.toString());
            // 如果有业务需要，可以重发消息
        });
    }
}

例子二

/**
 * 将容器缓存到本地
 */
@Component
public class SpringContextHolder implements ApplicationContextAware {

	// 容器对象
    private static ApplicationContext applicationContext = null;

    private SpringContextHolder() {
    }

	/**
	 * 获取容器中的Bean对象
	 */
    public static <T> T getBean(Class<T> clazz) {
        return applicationContext.getBean(clazz);
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringContextHolder.applicationContext = applicationContext;
    }
}