没有定义名为''的bean

Question

我正在测试Spring中的简单AOP用例,但是我得到了以下错误,

线程"main"中的异常org.springframework.beans.factory.NoSuchBeanDefinitionException:没有定义名为'bean1'的bean

以下是我的源文件,

1. DemoConfig.java

   package com.luv2code.aopdemo;
   import org.springframework.beans.factory.annotation.Qualifier;
   import org.springframework.context.annotation.Bean;
   import org.springframework.context.annotation.ComponentScan;
   import org.springframework.context.annotation.Configuration;
   import org.springframework.context.annotation.EnableAspectJAutoProxy;
   
   import com.luv2code.aopdemo.aspect.MyDemoLoggingAspect;
   import com.luv2code.aopdemo.dao.AccountDAO;
   
   @Configuration
   @EnableAspectJAutoProxy
   @ComponentScan("com.luv2code.aopdemo")
   public class DemoConfig {
   
       @Bean
       @Qualifier("bean1")
       public AccountDAO accDao() {
           return new AccountDAO();
       }
   
       @Bean
       @Qualifier("bean2")
       public MyDemoLoggingAspect myAscpect() {
           return new MyDemoLoggingAspect();
       }
   }
   

2. MyDemoLoggingAspect.java

    package com.luv2code.aopdemo.aspect;
   
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
   
    @Aspect
    public class MyDemoLoggingAspect {
   
       // this is where we add all of our related advices for logging  
       // let's start with an @Before advice
       @Before("execution(** com.luv2code.aopdemo.dao.AccountDAO.addAccount(..))")
       public void beforeAddAccountAdvice() {  
           System.out.println("\n=====>>> Executing @Before advice on addAccount()");
   
       }
    }
   

3. MainDemoApp.java

   package com.luv2code.aopdemo;
   
   import com.luv2code.aopdemo.dao.AccountDAO;
   
   public class MainDemoApp {
   
       public static void main(String[] args) {
           // read spring config java class
           AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(DemoConfig.class);          
           // get the bean from spring container
           AccountDAO theAccountDAO = context.getBean("bean1", AccountDAO.class);
           // call the business method
           theAccountDAO.addAccount();
           // do it again!
           System.out.println("\nlet's call it again!\n");
           // call the business method again
           theAccountDAO.addAccount();     
           // close the context
           context.close();
       }
   }
   

我已经给出了我的bean ID"bean1",即使在Spring无法在上下文中找到我的bean之后也是如此.为什么我会收到此错误以及如何解决此问题？

Answer 1

该@Qualifier标签是用来与@Autowired注解.

你需要的是什么

@Bean(name="bean1")
public AccountDAO accDao() {
    return new AccountDAO();
}