spring 手动注册bean

//将applicationContext转换为ConfigurableApplicationContext

ConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) SpringContextUtil.getApplicationContext();

 

// 获取bean工厂并转换为DefaultListableBeanFactory

DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) configurableApplicationContext.getBeanFactory();

 

// 通过BeanDefinitionBuilder创建bean定义

BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(UserController.class);

 

// 设置属性userService,此属性引用已经定义的bean:userService,这里userService已经被spring容器管理了.

beanDefinitionBuilder.addPropertyReference("userService", "userService");

 

// 注册bean

defaultListableBeanFactory.registerBeanDefinition("userController", beanDefinitionBuilder.getRawBeanDefinition());

 

 

UserController userController = (UserController) SpringContextUtil.getBean("userController");

 

return userController.toAction("动态注册生成调用");

 

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注意applicationContext.xml文件的路径配置，按自己项目spring配置文件的路径做相应的调整
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
* springApplicationContext工具
*/
public class SpringBeanRegisterUtil {
private static ApplicationContext context=new
ClassPathXmlApplicationContext("applicationContext.xml");
private static ConfigurableApplicationContext configurableContext = (ConfigurableApplicationContext) context;
private static BeanDefinitionRegistry beanDefinitionRegistry = (DefaultListableBeanFactory) configurableContext.getBeanFactory();

/**
* 注册bean
* @param beanId 所注册bean的id
* @param className bean的className，
* 三种获取方式：1、直接书写，如：com.mvc.entity.User
* 2、User.class.getName
* 3.user.getClass().getName()
*/
public static void registerBean(String beanId,String className) {
// get the BeanDefinitionBuilder
BeanDefinitionBuilder beanDefinitionBuilder =
BeanDefinitionBuilder.genericBeanDefinition(className);
// get the BeanDefinition
BeanDefinition beanDefinition=beanDefinitionBuilder.getBeanDefinition();
// register the bean
beanDefinitionRegistry.registerBeanDefinition(beanId,beanDefinition);
}

/**
* 移除bean
* @param beanId bean的id
*/
public static void unregisterBean(String beanId){
beanDefinitionRegistry.removeBeanDefinition(beanId);
}

/**
* 获取bean
* @param name bean的id
* @param <T>
* @return
*/
public static <T> T getBean(String name) {
return (T) context.getBean(name);
}
}
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