获取Spring上下文已实例化的bean

╰+哭是因爲堅強的太久メ 2022-12-27 06:30 152阅读 0赞

package com.example.demo;
    
    import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.stereotype.Component;
    
    import java.util.Map;
    
    /**
     * 获取Spring上下文已实例化的bean
     *
     * @author lzk
     * @version 1.0
     * @date 2020/12/8 14:15
     */
    @Component
    public class SpringContextUtil implements ApplicationContextAware {
    
        private static ApplicationContext context = null;
    
        private SpringContextUtil() {
            super();
        }
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
            context = applicationContext;
        }
    
        /**
         * 根据名称获取bean
         * @param beanName
         * @return
         */
        public static Object getBean(String beanName) {
            return context.getBean(beanName);
        }
    
        /**
         * 根据bean名称获取指定类型bean
         * @param beanName bean名称
         * @param clazz 返回的bean类型,若类型不匹配,将抛出异常
         */
        public static <T> T getBean(String beanName, Class<T> clazz) {
            return context.getBean(beanName, clazz);
        }
        /**
         * 根据类型获取bean
         * @param clazz
         * @return
         */
        public static <T> T getBean(Class<T> clazz) {
            T t = null;
            Map<String, T> map = context.getBeansOfType(clazz);
            for (Map.Entry<String, T> entry : map.entrySet()) {
                t = entry.getValue();
            }
            return t;
        }
    
        /**
         * 是否包含bean
         * @param beanName
         * @return
         */
        public static boolean containsBean(String beanName) {
            return context.containsBean(beanName);
        }
    
        /**
         * 是否是单例
         * @param beanName
         * @return
         */
        public static boolean isSingleton(String beanName) {
            return context.isSingleton(beanName);
        }
    
        /**
         * bean的类型
         * @param beanName
         * @return
         */
        public static Class getType(String beanName) {
            return context.getType(beanName);
        }
    
    }