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本文不谈原理#xff0c;直接上实战。
几个关键点#xff1a;如何拿到Spring上下文来创建bean或移除bean#xff1f;如何准备构建bean所需的BeanDefinition#xff1f;
第一问#xff1a;可注入bean工厂org.springframework.beans.factory.support.…几个关键点需要知道
本文不谈原理直接上实战。
几个关键点如何拿到Spring上下文来创建bean或移除bean如何准备构建bean所需的BeanDefinition
第一问可注入bean工厂org.springframework.beans.factory.support.DefaultListableBeanFactory得到
第二问使用org.springframework.beans.factory.support.BeanDefinitionBuilder来构建BeanDefinition。
实例
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import org.springframework.stereotype.Component;import java.beans.Introspector;
import java.lang.reflect.Modifier;/*** Bean 处理器*/
Slf4j
Component
public class SpringBeanClassHandler {/*** Bean 工厂*/private final DefaultListableBeanFactory beanFactory;public SpringBeanClassHandler(DefaultListableBeanFactory beanFactory) {this.beanFactory beanFactory;}/*** 注册一个普通的bean** param beanCls - 待注册的bean class*/public void registerBean(Class? beanCls) {if (beanCls null) {return;}if (Modifier.isAbstract(beanCls.getModifiers())|| Modifier.isPrivate(beanCls.getModifiers())|| Modifier.isNative(beanCls.getModifiers())|| Modifier.isInterface(beanCls.getModifiers())) {log.warn(can not support register this class to bean for: {} - {}, beanCls.getName(), Modifier.toString(beanCls.getModifiers()));}// 注册新的BeanString beanName Introspector.decapitalize(beanCls.getSimpleName());BeanDefinitionBuilder builder BeanDefinitionBuilder.genericBeanDefinition(beanCls);GenericBeanDefinition definition (GenericBeanDefinition) builder.getRawBeanDefinition();definition.setAutowireMode(GenericBeanDefinition.AUTOWIRE_BY_TYPE);// 按类型自动注入beanFactory.registerBeanDefinition(beanName, definition);log.info(dynamic successfully register bean: {}, beanFactory.getBean(beanName));}/*** 移除 Bean** param beanCls - Bean class*/public void removeBean(Class? beanCls) {if (beanCls null) {return;}String clsName Introspector.decapitalize(beanCls.getSimpleName());if (beanFactory.containsBean(clsName)) {beanFactory.removeBeanDefinition(clsName);}}/*** Spring 容器是否 已存在Bean** param beanCls* return - boolean*/public boolean containsBean(Class? beanCls) {return beanFactory.containsBean(Introspector.decapitalize(beanCls.getSimpleName()));}
}
完结。
