Spring:正确设置@ComponentScan

问题描述

我为我的 Spring Application Context 设置了以下设置.

I have following set up for my Spring Application Context.

@Configuration
public class RmiContext {
@Bean
    public RmiProxyFactoryBean service() {
        RmiProxyFactoryBean rmiProxy = new RmiProxyFactoryBean();
        rmiProxy.setServiceUrl("rmi://127.0.1.1:1099/Service");
        rmiProxy.setServiceInterface(Service.class);
        return rmiProxy;
    }
}

@Configuration
public class LocalContext {
@Bean
    public Controller Controller() {
        return new ControllerImpl();
    }
}

@Configuration
@Import({RmiContext.class, LocalContext.class})
public class MainContext {

}

上述设置工作正常，但我想启用 @ComponentScan 用 @Component 注释 Controller，因为有很多 控制器s 在我的应用程序中使用 @Bean 一一声明时很乏味.

The above setup works fine, but I want to enable @ComponentScan annotating Controllers with @Component as there are many Controllers in my application which is tedious when declared one by one using @Bean.

@Configuration
@ComponentScan(basePackageClasses = {Controller.class})
public class LocalContext {
    /* ... */
}

问题是当我执行 @ComponentScan(basePackageClasses = {Controller.class}) 时，之前正常工作的 RmiProxyFactoryBean 无法识别或无法创建.

The problem is that when I do @ComponentScan(basePackageClasses = {Controller.class}), the previously fine working RmiProxyFactoryBean are not recognized or can't be created.

那么，如何配置我的 MainContext 以便通过 RMI 和本地 bean 创建 bean?

So, How do I configure my MainContext so that both beans via RMI and local beans are created?

推荐答案

@Configuration 也是组件扫描的候选者，因此您可以通过以下方式扫描 RmiContext 中的所有 bean 以及控制器包中的所有控制器:

@Configuration is also a candidate for component scan, so you can scan all the beans in RmiContext and all controllers in your controller package by:

@Configuration
@ComponentScan(basePackages = {"org.example.controllers", "package.of.RmiContext"})
public class MainContext {
}

--编辑--

@Configuration 是组件扫描的候选者，这是在我的电脑上工作的测试用例:

@Configuration is a candidate for component scan, here is the test case that works in my pc:

package scan.controllers;
@Controller
public class ExampleController {
}

package scan;
public interface RMIService {
}

package scan;
@Configuration
public class RmiContext {
    @Bean
    public RmiProxyFactoryBean service() {
        RmiProxyFactoryBean rmiProxy = new RmiProxyFactoryBean();
        rmiProxy.setServiceUrl("rmi://127.0.1.1:1099/Service");
        rmiProxy.setServiceInterface(RMIService.class);
        rmiProxy.setLookupStubOnStartup(false);
        return rmiProxy;
    }
}

package scan;
@Configuration
//MainContext will auto scan RmiContext in package scan and all controllers in package scan.controllers
@ComponentScan(basePackages = {"scan", "scan.controllers"})
public class MainContext {
}

package scan;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes={MainContext.class})
public class TestContext {

    @Autowired private RMIService rmi;
    @Autowired private ExampleController controller;

    @Test
    public void test() {
        //both controller and rmi service are autowired as expected
        assertNotNull(controller);
        assertNotNull(rmi);
    }
}

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