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ApplicationContext applicationContext = SpringContextUtils.getApplicationContext();//将applicationContext转换为ConfigurableApplicationContextConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;// 获取bean工厂并转换为DefaultListableBeanFactoryDefaultListableBeanFactory 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beandefaultListableBeanFactory.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 
   
         * @return     */    public static 
    
      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);    }}
    
   

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