@Configuration+@ConfigurationPro

 @Configuration+@ConfigurationProperties+@EnableConfigurationProperties

最佳设计方案（现在又改板了）：

Bean上面直接设置@ConfigurationProperties

//需要依赖spring-boot-configuration-processor

@ConfigurationProperties(prefix = "stu")

public class Stu {

    String name;

    public Stu(String name) {

        this.name = name;

    }

    public Stu() {

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    @Override

    public String toString() {

        return "Stu{" +

                "name='" + name + '\'' +

                '}';

    }

}

方式一：configuration上面跟随@EnableConfigurationProperties【这种情况只有configuration里面一个Bean 】

@Configuration

@EnableConfigurationProperties

public class StuConfiguration {

    @Bean

    public Stu stu(){

        return  new Stu();

    }

}

方式二：configuration上面跟随@EnableConfigurationProperties【这种情况只有configuration里面一个Bean 】

package com.example.demo11.configuration;

import com.example.demo11.entity.Stu;

import org.springframework.boot.context.properties.EnableConfigurationProperties;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

@Configuration

//@EnableConfigurationProperties(Stu.class),如果携带class参数则有用注册Bean的能力,

//因为实现了ImportBeanDefinitionRegistrar接口,Import三插之一

//这里的Bean名称非常有意思【类型名称+全包名】

@EnableConfigurationProperties(Stu.class)

public class StuConfiguration {

    @Bean

    public Stu stu2(){

        return  new Stu();

    }

}

启动查看

@SpringBootApplication

public class Demo11Application {

    public static void main(String[] args) {

        ConfigurableApplicationContext context = SpringApplication.run(Demo11Application.class, args);

        Stu stu = context.getBean("stu-com.example.demo11.entity.Stu", Stu.class);

        System.out.println(context.getBeansOfType(Stu.class).size());

        System.out.println(stu.toString());

        context.close();

    }

}