SpringBoot 创建对象常见的几种方式小结

import org.springframework.stereotype.Component;

@Component
public class User {
    public void say() {
        System.out.println("Hello User!");
    }
}

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class BeanConfig {

    @Bean
    public User user() {
        return new User();
    }
}

public class user {
    public void say() {
         System.out.println("Hello User!");
    }
}

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

@Configuration
@Import(BeanConfig.class)
public class MainConfig {
    // 通过 @Import 导入 BeanConfig 中的 Bean
}

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class ManualBeanRegistration {

    public static void main(String[] args) {
        // 创建 Spring 容器
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();

        // 注册配置类
        context.register(BeanConfig.class);

        // 启动容器
        context.refresh();

        // 获取并使用 Bean
        MyBean myBean = context.getBean(MyBean.class);
        myBean.printMessage();

        // 关闭容器
        context.close();
    }
}