Question

我需要实例化一个原型bean，它有多个带参数和Autowired注入的构造函数。

我从这里找到的解决方案开始实例化bean： Spring bean with runtime constructor arguments

Bean定义

public MyBean {

   @Autowired
   private MyService myService

   public MyBean(int a1, String a21, String a22) {
   }

   public MyBean(int a1, String[] a2, int a3) {
   }

   public void exampleCallService(int value) {
       myService.remoteMethod(value);
   }
}

Spring配置

@Configuration
public AppConfig {

   @Bean("myBeanV1")
   @Scope(BeanDefinition.SCOPE_PROTOTYPE)
   public MyBean myBeanV1(int a1, String a21, String a22) {
       return new MyBean(a1, a21, a22);
   }

   @Bean("myBeanV2")
   @Scope(BeanDefinition.SCOPE_PROTOTYPE)
   public MyBean myBeanV2(int a1, String[] a2, int a3) {
       return new MyBean(a1, a2, a3);
   }
}

测试类

@Component
public class ExampleTest {

   @Autowired
   private MyService myService

   @Autowired
   private BeanFactory beanFactory;

   public String exampleMethod(){
      MyBean myBean = (MyBean) beanFactory.getBean("myBeanV1", 1, "a", "b");

      myService.remoteMethod(42); // OK
      myBean.exampleCallService(42); // NPE
   }
}

但是我的服务仍然没有注入，我在尝试拨打exampleCallService()时获得了NPE。可能是因为手动调用了new MyBean()。我怎样才能正确实例化这样的bean？我使用的是spring 3.0.7

使用参数和注入实例化Spring原型bean

0 个答案: