@Configuration

@Configuration就是以前spring的xml配置文件中的<beans> 的java实现，而@Bean就相当于<bean>
@Configuration+@Bean就实现了spring以前配置文件中的类的配置加载。

@Configurable

主要是这个注解以前了解的不多。百度了一下，才知道其主要作用

主要是适用于，某些自己new出来的对象，而new这个对象又必须依赖spring容器里的对象，才能完成一些工作。

具体怎么运用。

1.添加依赖

 <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
        <version>5.1.9.RELEASE</version>
  </dependency>
  <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-instrument</artifactId>
        <version>5.1.9.RELEASE</version>
 </dependency>

2.具体的类

Student

package com.d4c.custombean.config;

import org.springframework.stereotype.Component;

@Component
public class Student {

    public void study(){
        System.out.println("I am a student,I must to study!");
    }
}

People

package com.d4c.custombean.config;

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

import javax.annotation.Resource;

@Configurable
public class People {

    @Resource
    private Student student;

    public void doSomething(){
        student.study();
    }

}

启动类加注解@SpringBootApplication+@EnableSpringConfigured

package com.d4c.custombean;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableLoadTimeWeaving;
import org.springframework.context.annotation.aspectj.EnableSpringConfigured;

@ServletComponentScan
@SpringBootApplication
@EnableSpringConfigured
@EnableLoadTimeWeaving
public class CustomBeanApplication {
    public static void main(String[] args) {
        SpringApplication.run(CustomBeanApplication.class, args);
    }
}

测试类

package com.d4c.custombean.config;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@SpringBootTest
@RunWith(SpringRunner.class)
public class PeopleTest {

    @Test
    public void doSomething() {
        People people = new People();
        people.doSomething();
    }
}

配置jvm参数

不配置是会报错的

-javaagent:E:\maven_repository\org\springframework\spring-instrument\5.1.9.RELEASE\spring-instrument-5.1.9.RELEASE.jar
//直接指定spring-instrument.jar的maven本地仓库的地址就行

如图：

image.png

OK ，可以了