ApplicationContext的使用

package com.study.demo.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;

public class ApplicationContextUtil {

	private static final Logger LOGGER = LoggerFactory.getLogger(ApplicationContextUtil.class);
	
    private static ApplicationContext applicationContext;

    private ApplicationContextUtil() {
    }

    static void setApplicationContext(ApplicationContext applicationContext) {
    	ApplicationContextUtil.applicationContext = applicationContext;
    }

    private static boolean checkApplicationContext() {
        if (applicationContext == null) {
            LOGGER.info("未獲取ApplicationContext");
        }

        return applicationContext != null;
    }

    public static Object getBean(String beanName) {
        Object result = null;
        if (checkApplicationContext()) {
            try {
                result = applicationContext.getBean(beanName);
            } catch (Exception e) {
                LOGGER.error("獲取Bean異常 e:{}", e);
            }
        }
        return result;
    }

    public static <T> T getBean(String beanName, Class<T> className) {
        T result = null;
        if (checkApplicationContext()) {
            try {
                result = applicationContext.getBean(beanName, className);
            } catch (Exception e) {
                LOGGER.error("獲取Bean異常 e:{}", e);
            }
        }
        return result;
    }
}