spring 是直接讀取位元組碼解析上面的註解，只要是配置了@compponent ,@service註解的類，都會在spring 被解析和例項化，後面可以直接用Context來獲取類例項操作。

通過配置檔案 component-scan 和 在類上註解Component來實現最簡單配置

包名為： Com.Cn,Bing

配置檔案Beans.xml :

    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
    xmlns="http://www.springframework.org/schema/beans"  
    xmlns:context="http://www.springframework.org/schema/context"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.3.xsd">        
                <context:component-scan base-package="Com.Cn.Bing"/> 
   </beans>

Man檔案：
        ClassPathResource resource=new ClassPathResource("Beans.xml");  
        BeanFactory context=new DefaultListableBeanFactory();  
        BeanDefinitionReader bdr=new XmlBeanDefinitionReader((BeanDefinitionRegistry) context);
        bdr.loadBeanDefinitions(resource);
        
        AwareBeanPoscesser ar=new AwareBeanPoscesser();
        ar.setBeanFactory(context);
        ((ConfigurableBeanFactory)context).addBeanPostProcessor(ar);

          Student te = (Student) context.getBean("student");
          System.out.println(te.toString());

AwareBeanPoscesser 類：

package Com.Cn.Bing;

import org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor;

public class AwareBeanPoscesser extends AutowiredAnnotationBeanPostProcessor {
      
       long i=100;
}
 

Student類：

@Component
public class Student {
    
    public School school;
 
    public Student() {
    }
 
    public void setSchool(School school) {
        this.school = school;
    }
 
    public String toString() {
        return "Student [ school=" + school + "]";
    }

}