Question

当我使用像这样的BeanFactory从spring bean配置文件访问bean时：

public class Person {
    private String id,address;
    @Autowired
    private Customer customer;
     //setters & getters
    }

和bean配置文件

<bean name="person" class="com.ram.spring.model.Person"></bean>
<bean class="com.ram.spring.model.Customer">
    <property name="email" value="ram@adp.com"></property>
    <property name="name" value="Ram"></property>
</bean>

这里是执行者类

public class PersonExecutor {

    public static void main(String[] args) {
        BeanFactory context = new XmlBeanFactory(new ClassPathResource("Spring.xml"));
        Person person = (Person)context.getBean("person");
        System.out.println(person.getCustomer());
    }

}

当我执行此操作时，我得到null。注释不支持BeanFactory吗？任何想法??

Answer 1

方法1：在xml中包含以下代码

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:annotation-config />

    <!-- Remaining bean declaration -->
</beans>

方法2：删除@Autowired并仅在xml文件中注入客户。

<bean name="person" class="com.ram.spring.model.Person">
    <property name="customer" ref="customer"></property>
</bean>
<bean name="customer" class="com.ram.spring.model.Customer">
    <property name="email" value="ram@adp.com"></property>
    <property name="name" value="Ram"></property>
</bean>

Answer 2

您必须使用AnnotationConfigApplicationContext或你必须添加到yor Spring.xml来激活注释扫描。

Answer 3

正如@jens建议的那样

你应该激活annotation scan

<context:component-scan base-package="package_path">
</context:component-scan>
<context:annotation-config />

希望有所帮助

为什么@autowired在访问bean时无效

3 个答案: