有同名的bean需要配置：
spring.main.allow-bean-definition-overriding=true
否则报错。

package cn.edu.tju.component;import org.springframework.stereotype.Component;@Component
public class Person {private String name;private int age;{this.name = "nameInComponent";this.age =33;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}
}

package cn.edu.tju.config;import cn.edu.tju.component.Person;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
public class PersonConfig {@Bean("person")Person getPerson(){Person p = new Person();p.setAge(23);p.setName("nameInBeanAnnotation");return  p;}
}

package cn.edu.tju;import cn.edu.tju.component.Person;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;@SpringBootApplication
public class Start {public static void main(String[] args) {ConfigurableApplicationContext context = SpringApplication.run(Start.class, args);Person person = context.getBean("person", Person.class);System.out.println(person.getName());}
}

运行结果