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puzhibing

2022-08-22 1421f8e9c308c4741cb396309035009393b5b036

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package com.stylefeng.guns.core.util;
 
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
 
/**
 * Spring的ApplicationContext的持有者,可以用静态方法的方式获取spring容器中的bean
 *
 * @author fengshuonan
 * @date 2016年11月27日 下午3:32:11
 */
@Component
public class SpringContextHolder implements ApplicationContextAware {
 
    private static ApplicationContext applicationContext;
 
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextHolder.applicationContext = applicationContext;
    }
 
    public static ApplicationContext getApplicationContext() {
        assertApplicationContext();
        return applicationContext;
    }
 
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String beanName) {
        assertApplicationContext();
        return (T) applicationContext.getBean(beanName);
    }
 
    public static <T> T getBean(Class<T> requiredType) {
        assertApplicationContext();
        return applicationContext.getBean(requiredType);
    }
 
    private static void assertApplicationContext() {
        if (SpringContextHolder.applicationContext == null) {
            throw new RuntimeException("applicaitonContext属性为null,请检查是否注入了SpringContextHolder!");
        }
    }
 
}