1、BeanDefinition 接口

public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccessor
        implements BeanDefinition, Cloneable {
    private volatile Object beanClass;
    private String scope = SCOPE_DEFAULT;
    private boolean abstractFlag = false;
    private boolean lazyInit = false;
    private int autowireMode = AUTOWIRE_NO;
    private int dependencyCheck = DEPENDENCY_CHECK_NONE;
    private String[] dependsOn;
    private ConstructorArgumentValues constructorArgumentValues;
    private MutablePropertyValues propertyValues;
    private String factoryBeanName;
    private String factoryMethodName;
    private String initMethodName;
    private String destroyMethodName;
}

<bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource" 
      init-method="init" destroy-method="close">

package constxiong;
 
import org.springframework.beans.factory.config.ConstructorArgumentValues;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.RootBeanDefinition;
 
/**
 * 测试 BeanDefinition 构建
 * @author ConstXiong
 */
public class Test {
	
	public static void main(String[] args) {
		DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
		// BeanDefinitionBuilder 构建 BeanDefinition
		BeanDefinitionBuilder builder = BeanDefinitionBuilder
				.genericBeanDefinition(User.class)
				.addPropertyValue("id", 1) //属性设置
				.addPropertyValue("name", "constxiong");
		beanFactory.registerBeanDefinition("user1", builder.getBeanDefinition());
		User user = beanFactory.getBean("user1", User.class);
		System.out.println(user);
		
		//直接 new 的方式，创建 BeanDefinitionBuilder 对象
		RootBeanDefinition beanDefinition = new RootBeanDefinition(User.class);
		//构造参数
		ConstructorArgumentValues constructorArgumentValues = new ConstructorArgumentValues();
		constructorArgumentValues.addIndexedArgumentValue(0, 1);
		constructorArgumentValues.addIndexedArgumentValue(1, "user2");
		beanDefinition.setConstructorArgumentValues(constructorArgumentValues);
		beanFactory.registerBeanDefinition("user2", beanDefinition);
		User user2 = beanFactory.getBean("user2", User.class);
		System.out.println(user2);
	}
 
}

 2、BeanDefinitionReader 接口

3、BeanFactory接口

4、BeanFactoryPostProcessor

这里就以官网上的demo为例：

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations" value="classpath:com/something/jdbc.properties"/>
</bean>

<bean id="dataSource" destroy-method="close"
        class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="${jdbc.driverClassName}"/>
    <property name="url" value="${jdbc.url}"/>
    <property name="username" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
</bean>

# jdbc.properties
jdbc.driverClassName=org.hsqldb.jdbcDriver
jdbc.url=jdbc:hsqldb:hsql://production:9002
jdbc.username=sa
jdbc.password=root