我想从某些配置创建自定义子上下文，并另外以编程方式添加一些bean。
我阅读了关于BeanDefinitionRegistryPostProcessor的回复https://stackoverflow.com/a/4540762/258483，但不明白如何使用它。如果我编写BeanDefinitionRegistryPostProcessor的实现，那么接下来该怎么做？加入上下文？但这是一个问题：如何将bean添加到上下文中！如果我能够将BeanDefinitionRegistryPostProcessor添加到上下文中，那么为什么我会问如何添加bean？
问题是我有上下文并想要添加bean。
我知道我可以实例化bean并使用
自动装配它们Context#getAutowireCapableBeanFactory().createBean(klass);
但这显然只是连线类，但没有将它添加到上下文中？
答案 0 :(得分：2)
从Spring 5.0开始，您可以使用ApplicationContext直接动态注册bean。
GenericApplicationContext ac = ....;
// example
ac.registerBean("myspecialBean", Integer.class, () -> new Integer(100));
// using BeanDefinitionCustomizer
ac.registerBean("myLazySpecialBean", Integer.class, () -> new Integer(100), (bd) -> bd.setLazyInit(true));
有关registerBean
答案 1 :(得分：0)
最初由我自己回答here，并在此重复。
实际上
grep: /var/log/nginx/access.log*: No scuh file or directory来自AnnotationConfigApplicationContext，其中有AbstractApplicationContext方法留空以进行覆盖
postProcessBeanFactory要利用此功能，请创建/**
* Modify the application context's internal bean factory after its standard
* initialization. All bean definitions will have been loaded, but no beans
* will have been instantiated yet. This allows for registering special
* BeanPostProcessors etc in certain ApplicationContext implementations.
* @param beanFactory the bean factory used by the application context
*/
protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
}
类，其类似于以下内容（针对AnnotationConfigApplicationContextProvider实例示例，您可以使用Vertx代替...）
MyClass创建public class CustomAnnotationApplicationContextProvider {
private final Vertx vertx;
public CustomAnnotationApplicationContextProvider(Vertx vertx) {
this.vertx = vertx;
}
/**
* Register all beans to spring bean factory
*
* @param beanFactory, spring bean factory to register your instances
*/
private void configureBeans(ConfigurableListableBeanFactory beanFactory) {
beanFactory.registerSingleton("vertx", vertx);
}
/**
* Proxy method to create {@link AnnotationConfigApplicationContext} instance with no params
*
* @return {@link AnnotationConfigApplicationContext} instance
*/
public AnnotationConfigApplicationContext get() {
return new AnnotationConfigApplicationContext() {
@Override
protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
super.postProcessBeanFactory(beanFactory);
configureBeans(beanFactory);
}
};
}
/**
* Proxy method to call {@link AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(DefaultListableBeanFactory)} with our logic
*
* @param beanFactory bean factory for spring
* @return
* @see AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(DefaultListableBeanFactory)
*/
public AnnotationConfigApplicationContext get(DefaultListableBeanFactory beanFactory) {
return new AnnotationConfigApplicationContext(beanFactory) {
@Override
protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
super.postProcessBeanFactory(beanFactory);
configureBeans(beanFactory);
}
};
}
/**
* Proxy method to call {@link AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(Class[])} with our logic
*
* @param annotatedClasses, set of annotated classes for spring
* @return
* @see AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(Class[])
*/
public AnnotationConfigApplicationContext get(Class<?>... annotatedClasses) {
return new AnnotationConfigApplicationContext(annotatedClasses) {
@Override
protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
super.postProcessBeanFactory(beanFactory);
configureBeans(beanFactory);
}
};
}
/**
* proxy method to call {@link AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(String...)} with our logic
*
* @param basePackages set of base packages for spring
* @return
* @see AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(String...)
*/
public AnnotationConfigApplicationContext get(String... basePackages) {
return new AnnotationConfigApplicationContext(basePackages) {
@Override
protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
super.postProcessBeanFactory(beanFactory);
configureBeans(beanFactory);
}
};
}
}
时，您可以使用
ApplicationContext