SpringBoot注入Bean的几种方式

目录

统一测试类与config类

1. 启动类注入Bean

2.启动类扫描@ComponentScan

3.启动类@EnableConfigurationProperties

4.启动类@Import

统一测试类与config类

yml

student:
  red: dou

config 

@Configuration注解 与 @Component注解都可以。

@Data
@Configuration
@ConfigurationProperties(prefix = "student")  // 文件上传 配置前缀file.oss
public class MinIOConfigProperties implements Serializable {

    private String red;

}

@Data
@Component
@ConfigurationProperties(prefix = "student")  // 文件上传 配置前缀file.oss
public class MinIOConfigProperties implements Serializable {

    private String red;

}

test 

@SpringBootTest
class SpringBootTest01ApplicationTests {

    @Autowired
    private MinIOConfigProperties minIOConfigProperties;


    @Test
    void contextLoads() {
        // 获取accessKey值
        String accessKey = minIOConfigProperties.getRed();
        System.out.println(accessKey);
    }

}

1. 启动类注入Bean

@SpringBootApplication
public class SpringBootTest01Application {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootTest01Application.class, args);
    }


    @Bean
    public MinIOConfigProperties minIOConfigProperties() {
        return new MinIOConfigProperties();
    }


}

2.启动类扫描@ComponentScan

@ComponentScan(basePackages = "com.ma.config")
@SpringBootApplication
public class SpringBootTest01Application {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootTest01Application.class, args);
    }

}

3.启动类@EnableConfigurationProperties

@SpringBootApplication
@EnableConfigurationProperties(MinIOConfigProperties.class)
public class SpringBootTest01Application {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootTest01Application.class, args);
    }

}

4.启动类@Import

@SpringBootApplication
@Import(MinIOConfigProperties.class)
public class SpringBootTest01Application {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootTest01Application.class, args);
    }

}