Question

我有一个具有Address依赖类型的Employee bean。我正在尝试在javaConfig中配置自动装配。但是获得NoQualifyingBeanException 虽然我使用@Qualifier()注释如下：

@Configuration
public class MyConfig {

    @Bean(name="addr1")
    public Address address() {      
        return new Address("Hello","hi",112233);
    }

    @Bean(name="address")
    public Address addressAgain() {
        return new Address("See You","Bi",114422);
    }

    @Bean(name="emp",autowire=Autowire.BY_TYPE)
    @Qualifier("addr1")
    public Employee employee() {

        Employee e = new Employee();
        e.setName("Raghu");
        e.setEmpID(111);
        //e.setAddress(address());

        return e;
    }

}

Answer 1

在每个name方法中指定不同的@Bean属性是不够的您应该考虑将其中一个bean标记为@Primary：

@Primary
@Bean(name = "address")
public Address addressAgain() {
    return new Address("See You");
}

离开其他人没有：

@Bean(name="addr1")
public Address address() {      
    return new Address("Hello","hi", 112233);
}

请注意，您不需要在@Qualifier("addr1")方法中添加employee()注释，以便能够自动装配addr1 bean。
当您从Address方法设置依赖项时，Spring已经知道您引用的@Bean bean实例：address()。

这就足够了：

@Bean(name = "emp", autowire = Autowire.BY_TYPE)
public Employee employee() {
    Employee e = new Employee();
    e.setName("Raghu");
    e.setAddress(address());
    return e;
}

在javaConfig中使用@Qualifier + @Bean（autowire = Autowire.BY_TYPE）

1 个答案: