Spring Framework - BeanFactoryPostProcessor Examples

package com.logicbig.example;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

public class BeanFactoryPostProcessorExample {

    public static void main (String[] args) {
        AnnotationConfigApplicationContext context =
                  new AnnotationConfigApplicationContext(MyConfig.class);
        MyBean bean = context.getBean(MyBean.class);
        bean.doSomething();
    }

    @Configuration
    public static class MyConfig {
        @Bean
        MyConfigBean myConfigBean () {
            return new MyConfigBean();
        }
    }

    private static class MyConfigBean implements BeanFactoryPostProcessor {

        @Override
        public void postProcessBeanFactory (
                  ConfigurableListableBeanFactory beanFactory)
                  throws BeansException {

            GenericBeanDefinition bd = new GenericBeanDefinition();
            bd.setBeanClass(MyBean.class);
            bd.getPropertyValues().add("strProp", "my string property");

            ((DefaultListableBeanFactory) beanFactory)
                      .registerBeanDefinition("myBeanName", bd);
        }
    }

    private static class MyBean {
        private String strProp;

        public void setStrProp (String strProp) {
            this.strProp = strProp;
        }

        public void doSomething () {
            System.out.println("from MyBean:  " + strProp);
        }
    }
}