（010）spring之BeanDefinitionRegistryPostProcessor动态注入bean

　　BeanDefinitionRegistryPostProcessor接口有两个方法postProcessBeanFactory、postProcessBeanDefinitionRegistry，在spring容器初始化时执行，如下：

　　pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.edu.spring</groupId>
    <artifactId>spring</artifactId>
    <version>1.0.0</version>

    <name>spring</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
    </dependencies>

</project>

View Code

　　Persion.java

package com.edu.spring;

public class Persion {

    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Persion [name=" + name + "]";
    }
}

View Code

　　MyBeanDefinitionRegistryPostProcessor.java

package com.edu.spring;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.stereotype.Component;

@Component
public class MyBeanDefinitionRegistryPostProcessor implements
        BeanDefinitionRegistryPostProcessor {

    @Override
    public void postProcessBeanFactory(
            ConfigurableListableBeanFactory beanFactory) throws BeansException {
        // TODO Auto-generated method stub

    }


    @Override
    public void postProcessBeanDefinitionRegistry(
            BeanDefinitionRegistry registry) throws BeansException {
        // TODO Auto-generated method stub
        for(int i=0;i<=10;i++){
            BeanDefinitionBuilder bdb=BeanDefinitionBuilder.rootBeanDefinition(Persion.class);
            bdb.addPropertyValue("name","admin"+i);
            registry.registerBeanDefinition("persion"+i, bdb.getBeanDefinition());
        }
    }

}

View Code

　　App.java

package com.edu.spring;

import java.util.Collection;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class App {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context=new AnnotationConfigApplicationContext("com.edu.spring");
        Collection<Persion> collection=    context.getBeansOfType(Persion.class).values();
        for(Persion p:collection){
            System.out.println(p);
        }
        context.close();
    }
}

View Code

　　运行结果如下：

 　　创建了11个bean，bean的名字为persion0... ..persion10，bdb.addPropertyValue("name","admin"+i);//给每个bean中的name属性设置值