手动注入bean到spring容器

ApplicationContext applicationContext = SpringContextUtils.getApplicationContext();
//将applicationContext转换为ConfigurableApplicationContext
ConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;

// 获取bean工厂并转换为DefaultListableBeanFactory
DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) configurableApplicationContext.getBeanFactory();

this.defaultListableBeanFactory = defaultListableBeanFactory;

String[] beanNamesForType = defaultListableBeanFactory.getBeanNamesForType(PayClient.class);

System.out.println("beanNamesForType:" + Arrays.toString(beanNamesForType));

// defaultListableBeanFactory.removeBeanDefinition("com.example.zuul.feign.PayClient");
defaultListableBeanFactory.removeBeanDefinition(beanNamesForType[0]);

// 通过BeanDefinitionBuilder创建bean定义
BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(PayClient.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("payClient", "payClient");

// 注册bean
defaultListableBeanFactory.registerBeanDefinition("com.example.zuul.feign.PayClient", beanDefinitionBuilder.getRawBeanDefinition());

Object bean = SpringContextUtils.getBean(PayClient.class);

package com.example.zuul;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * 获取ApplicationContext和Object的工具类
 */
@Component
@SuppressWarnings({ "rawtypes", "unchecked" })
public class SpringContextUtils implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    /**
     * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量.
     */
    public void setApplicationContext(ApplicationContext applicationContext) {

        SpringContextUtils.applicationContext = applicationContext; // NOSONAR
    }

    /**
     * 取得存储在静态变量中的ApplicationContext.
     */
    public static ApplicationContext getApplicationContext() {
        checkApplicationContext();
        return applicationContext;
    }

    private static void checkApplicationContext() {
        if (applicationContext == null) {
            throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder");
        }
    }

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

    //通过类型获取上下文中的bean
    public static Object getBean(Class<?> requiredType) {
        return applicationContext.getBean(requiredType);
    }

}