Spring boot post process 后置处理器以及 Scope 代码

BeanModifier.java

package com.pers.test.post;

import java.util.concurrent.atomic.AtomicInteger;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;

@Slf4j
public class BeanModifier implements BeanFactoryPostProcessor {

    private static final AtomicInteger integer = new AtomicInteger(0);

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        try {
            BeanDefinition welcomerDef = beanFactory.getBeanDefinition("WC");
            welcomerDef.getPropertyValues().add("welcomeText", "Good" + integer.incrementAndGet());
            log.info("执行了 {} 次", integer.get());
        } catch (Exception e) {
            log.error("An error occurred on setting welcomeText", e);
        }
    }
}

Starter.java

package com.pers.test.post;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author John Bi
 */
@SpringBootApplication
public class Starter implements CommandLineRunner {



    @Autowired
    private BeanFactory beanFactory;

    public static void main(String[] args) {
        SpringApplication.run(Starter.class, args);
    }


    @Override
    public void run(String... args) throws Exception {
        for (int i = 0; i < 10; i++) {
            Welcome welcome = (Welcome)beanFactory.getBean("WC");
            System.out.println(welcome.hashCode());
            System.out.println(welcome.getWelcomeText());
        }

    }
}

Welcome.java

package com.pers.test.post;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;

/**
 * @author John Bi
 */
@Slf4j
public class Welcome {

    @Value("${welcomeText:Good morning}")
    private String welcomeText;

    public void initWelcomer() {
        log.info("Welcomer is initialized, {}", welcomeText);
    }

    public String getWelcomeText() {
        return this.welcomeText;
    }

    public void setWelcomeText(String welcomeText) {
        log.info("Setting welcomeText to: " + welcomeText);
        this.welcomeText = welcomeText;
    }

    @Override
    public String toString() {
        return "Welcomer {text: " + this.welcomeText + "}";
    }

}

WelcomeConfiguration.java

package com.pers.test.post;

import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;

/**
 * @author John Bi
 */
@Configuration
public class WelcomeConfiguration {
    @Bean(initMethod = "initWelcomer", name = "WC")
    @Scope(scopeName = ConfigurableBeanFactory.SCOPE_PROTOTYPE )
    public Welcome welcome() {
        return new Welcome();
    }

    @Bean
    public BeanModifier beanModifier() {
        return new BeanModifier();
    }
}