通过ApplicationContextAware接口获取Spring配置文件中的所有Bean

来源：互联网发布：c语言缺陷与陷阱编辑：程序博客网时间：2024/06/11 00:37

org.springframework.context.ApplicationContextAware接口定义：

public interface ApplicationContextAware {void setApplicationContext(ApplicationContext applicationContext) throws BeansException;}

SpringContextUtils类实现org.springframework.context.ApplicationContextAware接口，并且是受spring管理的单例bean，由于实现了ApplicationContextAware接口中的setApplicationContext方法，它能够感知IoC容器，能获取到spring配置中所有的bean。

package io.steveguoshao.common.util;import org.springframework.beans.BeansException;import org.springframework.beans.factory.NoSuchBeanDefinitionException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;import org.springframework.context.ApplicationContextException;import org.springframework.context.ApplicationEventPublisherAware;import org.springframework.context.MessageSourceAware;import org.springframework.context.ResourceLoaderAware;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Component;/** * @author steveguoshao */@Component@Scope("singleton")public class SpringContextUtils implements ApplicationContextAware {// Spring应用上下文环境    private static ApplicationContext applicationContext;     /**     * 实现ApplicationContextAware接口的回调方法，设置上下文环境     *      * @param applicationContext     * @throws org.springframework.beans.BeansException     */    @Override    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {        SpringContextUtils.applicationContext = applicationContext;    }    /**     * @return ApplicationContext     */    public static ApplicationContext getApplicationContext() {        return applicationContext;    }    /**     * 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) applicationContext.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 {    return (T)applicationContext.getBean(clz);    }    /**     * 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 applicationContext.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 applicationContext.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 applicationContext.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 applicationContext.getAliases(name);    }}

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