spring_springboot_自定义SpringbootStarter&Bean的装配方式

自定义SpringbootStarter

Bean的装配方式

1. 单个Bean的装配

(1) @Configuration + @Bean 注解

package h.learn.config;

import h.learn.service.StudentService;
import h.learn.service.impl.StudentServiceImpl;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author huang
 * @since 2023/7/27
 */
@Configuration
public class RegisterWayByAnnoBean {
   
   

    @Bean
    public StudentService studentService() {
   
   
        return new StudentServiceImpl();
    }
}

2. 批量Bean的装配

(1) @Configuratioin + @Bean + @Bean + …

package h.learn.config;

import h.learn.service.StudentService;
import h.learn.service.impl.StudentServiceImpl;
import h.learn.service.impl.StudentServiceImpl2;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author huang
 * @since 2023/7/27
 */
@Configuration
public class RegisterWayByAnnoBean {
   
   

    @Bean
    public StudentService studentService() {
   
   
        return new StudentServiceImpl();
    }

    @Bean
    public StudentService studentService2() {
   
   
        return new StudentServiceImpl2();
    }
}

(2) 通过@Configuration +@ComponentScan('包路径') 扫描包路径下，类上加上了【@Controller+@Service+@Component+@RestController】注解的类。
①启动类只扫描配置类所在包，和controller所在包
②需要的类上加上service 上述注解
③创建配置类，@Configuration +@ComponentScan('需要扫描的包路径')

package h.learn.application;

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan(value = {
   
   "h.learn.controller","h.learn.config"})
@Slf4j
public class HLearnRegisterWayOfBeanApplication {
   
   
    public static void main(String[] args) {
   
   
        SpringApplication.run(HLearnRegisterWayOfBeanApplication.class,args);
        log.info("HLearnRegisterWayOfBeanApplication 启动成功");
    }
}