@ImportResource

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="personService" class="com.example.person.PersonServiceImpl"/>
</beans>

注解：

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ImportResource;

@ImportResource(locations = {"classpath:beans.xml"})
@SpringBootApplication
@ComponentScan(basePackages = {"com.example"})
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

@Configuration 和 @Bean

全注解方式加载：

package com.example.demo;

import com.example.person.PersonService;
import com.example.person.PersonServiceImpl;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AppConfig {
    @Bean
    public PersonService personService() {
        return new PersonServiceImpl();
    }
}