spring中注册bean(通过代码动态注册)

//将applicationContext转换为ConfigurableApplicationContextConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;// 获取bean工厂并转换为DefaultListableBeanFactoryDefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) configurableApplicationContext.getBeanFactory();// 通过BeanDefinitionBuilder创建bean定义BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(UserService.class);// 设置属性userAcctDAO,此属性引用已经定义的bean:userAcctDAObeanDefinitionBuilder.addPropertyReference("userAcctDAO", "UserAcctDAO");// 注册beandefaultListableBeanFactory.registerBeanDefinition("sdfds",beanDefinitionBuilder.getRawBeanDefinition());

User.java

public class User {private String username;private String password;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}

UserService.java

public class UserService {private User user;public void test(){System.out.println(user.getUsername()+"--------------------");}public User getUser() {return user;}public void setUser(User user) {this.user = user;}}

示例:

BeanFactoryAwareBean.java

import org.springframework.beans.BeansException;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.BeanFactoryAware;import org.springframework.beans.factory.support.BeanDefinitionBuilder;import org.springframework.beans.factory.support.DefaultListableBeanFactory;import org.springframework.context.ApplicationListener;import org.springframework.context.event.ContextRefreshedEvent;public class BeanFactoryAwareBean implements BeanFactoryAware,ApplicationListener<ContextRefreshedEvent> {private DefaultListableBeanFactory beanFactory;public void setBeanFactory(BeanFactory beanFactory) throws BeansException {System.out.println("setBeanFactory.........................");this.beanFactory = (DefaultListableBeanFactory) beanFactory;}public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {System.out.println("ContextRefreshed...................");BeanDefinitionBuilder userBeanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(User.class);userBeanDefinitionBuilder.addPropertyValue("username", "chinfeng");userBeanDefinitionBuilder.addPropertyValue("password", "123456");beanFactory.registerBeanDefinition("user",userBeanDefinitionBuilder.getRawBeanDefinition());BeanDefinitionBuilder usersBeanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(UserService.class);usersBeanDefinitionBuilder.addPropertyReference("user", "user");beanFactory.registerBeanDefinition("userService",usersBeanDefinitionBuilder.getRawBeanDefinition());}}

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><bean id="beanFactoryAwareBean" class="BeanFactoryAwareBean"></bean></beans>

结果:

setBeanFactory.........................
ContextRefreshed...................
chinfeng--------------------