spring BeanFactoryPostProcessor 的使用（类似aware模式）

朴灿烈づ我的快乐病毒、 2023-07-09 13:28 21阅读 0赞

/**
     * Copyright (c) 2005-2012 https://github.com/zhangkaitao
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     */
    package com.github.zhangkaitao.shiro.spring;
    
    import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.NoSuchBeanDefinitionException;
    import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
    import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
    
    public final class SpringUtils implements BeanFactoryPostProcessor {
    
        private static ConfigurableListableBeanFactory beanFactory; // Spring应用上下文环境
    
        @Override
        public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
            SpringUtils.beanFactory = beanFactory;
        }
    
        /**
         * 获取对象
         *
         * @param name
         * @return Object 一个以所给名字注册的bean的实例
         * @throws org.springframework.beans.BeansException
         *
         */
        @SuppressWarnings("unchecked")
        public static <T> T getBean(String name) throws BeansException {
            return (T) beanFactory.getBean(name);
        }
    
        /**
         * 获取类型为requiredType的对象
         *
         * @param clz
         * @return
         * @throws org.springframework.beans.BeansException
         *
         */
        public static <T> T getBean(Class<T> clz) throws BeansException {
            @SuppressWarnings("unchecked")
            T result = (T) beanFactory.getBean(clz);
            return result;
        }
    
        /**
         * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
         *
         * @param name
         * @return boolean
         */
        public static boolean containsBean(String name) {
            return beanFactory.containsBean(name);
        }
    
        /**
         * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
         *
         * @param name
         * @return boolean
         * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
         *
         */
        public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
            return beanFactory.isSingleton(name);
        }
    
        /**
         * @param name
         * @return Class 注册对象的类型
         * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
         *
         */
        public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
            return beanFactory.getType(name);
        }
    
        /**
         * 如果给定的bean名字在bean定义中有别名，则返回这些别名
         *
         * @param name
         * @return
         * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
         *
         */
        public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
            return beanFactory.getAliases(name);
        }
    
    }