java - 如何使用注释Bean和ComponentScan正确创建Spring bean？

Question

主要:

@SpringBootApplication
@ComponentScan(basePackageClasses = Application.class)
public class Application {

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

测试类:

public class Test {

  @Bean
  public Test test(){
      return new Test();
  }
}

当我尝试 Autowiring 它时，我得到了这个异常:

***************************
APPLICATION FAILED TO START
***************************

Description:

Field test in TestWithAutowire required a bean of type 'Test' that could not be found.


Action:

Consider defining a bean of type 'rcms.backend.exception.Test' in your configuration.


Process finished with exit code 1

我做错了什么，但我找不到它。

Answer 1

您可以创建一个新配置，例如SpringConfiguration，

package my.pkg.config;

@Configuration
public class SpringConfiguration {
    @Bean
    public Test test(){
        return new Test();
    }
}

在您的 Application 类中，您可以添加 @ComponentScan 注释以及您希望 Spring 扫描类的基础包，

@SpringBootApplication
@ComponentScan(basePackageClasses = {"my.pkg.config", "my.pkg.example"})
public class Application {

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

现在您可以在任何 Spring 组件中 Autowiring Test。例如，

package my.pkg.example;

@Component
public class TestExample {

    @Autowired
    private Test tst;

}