如何在运行时实例化 Spring 托管 Bean？

看起来我找到了一个解决方案。由于我使用的是基于java的配置，因此它比您想象的还要简单。xml中的另一种方法是查找方法，但是只能从春季版本4.1.X开始，因为它支持将参数传递给方法。

下面是一个完整的工作示例：

public class Container {
    private List<RuntimeBean> runtimeBeans = new ArrayList<RuntimeBean>();
    private RuntimeBeanFactory runtimeBeanFactory;

    public void load() {
        // repeated several times depending on external data/environment
        runtimeBeans.add(createRuntimeBean("Some external info1"));
        runtimeBeans.add(createRuntimeBean("Some external info2"));
    }

    public RuntimeBean createRuntimeBean(String info) {
         // should create bean which internally can have some 
         // spring annotations or in other words
         // should be managed by spring
         return runtimeBeanFactory.createRuntimeBean(info);
    }

    public void setRuntimeBeanFactory(RuntimeBeanFactory runtimeBeanFactory) {
        this.runtimeBeanFactory = runtimeBeanFactory;
    }
}

public interface RuntimeBeanFactory {
    RuntimeBean createRuntimeBean(String info);
}

//and finally
@Configuration
public class ApplicationConfiguration {
    
    @Bean
    Container container() {
        Container container = new Container(beanToInject());
        container.setBeanRuntimeFactory(runtimeBeanFactory());
        return container;
    }
        
    // LOOK HOW IT IS SIMPLE IN THE JAVA CONFIGURATION
    @Bean 
    public BeanRuntimeFactory runtimeBeanFactory() {
        return new BeanRuntimeFactory() {
            public RuntimeBean createRuntimeBean(String beanName) {
                return runtimeBean(beanName);
            }
        };
    }
    
    @Bean
    @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
    RuntimeBean runtimeBean(String beanName) {
        return new RuntimeBean(beanName);
    }
}

class RuntimeBean {
    @Autowired
    Container container;
}

就是这样。

谢谢大家。

我认为你的概念是错误的，因为你

绕过了Spring容器，并诉诸于使用常规的java构造函数，因此工厂方法的任何注释都被忽略了，这个bean永远不会被Spring管理。RuntimeBean beanRuntime = createRuntimeBean();

这是在一种方法中创建多个原型bean的解决方案，看起来不太好，但应该可以工作，我在运行时Bean中自动连接容器作为日志中显示的自动布线证明，您也可以在日志中看到每个Bean都是原型的新实例，当您运行此程序时。

'

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application {

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

        ApplicationContext context = new AnnotationConfigApplicationContext(Application.class);
        Container container = (Container) context.getBean("container");
        container.load();
    }
}

@Component
class Container {
    private List<RuntimeBean> runtimeBeans = new ArrayList<RuntimeBean>();
    @Autowired
    ApplicationContext context;

    @Autowired
    private ObjectFactory<RuntimeBean> myBeanFactory;

    public void load() {

        // repeated several times depending on external data/environment
        for (int i = 0; i < 10; i++) {
            // **************************************
            // COMENTED OUT THE WRONG STUFFF 
            // RuntimeBean beanRuntime = context.getBean(RuntimeBean.class);
            // createRuntimeBean();
            // 
            // **************************************

            RuntimeBean beanRuntime = myBeanFactory.getObject();
            runtimeBeans.add(beanRuntime);
            System.out.println(beanRuntime + "  " + beanRuntime.container);
        }
    }

    @Bean
    @Scope(BeanDefinition.SCOPE_PROTOTYPE)
    public RuntimeBean createRuntimeBean() {
        return new RuntimeBean();
    }
}

// @Component

class RuntimeBean {
    @Autowired
    Container container;

} '