Spring：正确设置@ComponentScan
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Spring: Properly setup @ComponentScan
提问by TheKojuEffect
I have following set up for my Spring Application Context.
我为我的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 {
}
The above setup works fine, but I want to enable @ComponentScanannotating Controllers with @Componentas there are many Controllers in my application which is tedious when declared one by one using @Bean.
上面的设置工作正常，但我想启用@ComponentScan注释Controllers，@Component因为Controller我的应用程序中有很多s，当使用@Bean.
@Configuration
@ComponentScan(basePackageClasses = {Controller.class})
public class LocalContext {
/* ... */
}
@ComponentScan(basePackageClasses = {Controller.class})@ComponentScan(basePackageClasses = {Controller.class})，以前的良好工作RmiProxyFactoryBeanRmiProxyFactoryBean无法识别或无法创建。So, How do I configure my MainContextso that both beans via RMI and local beans are created?
那么，如何配置我的MainContext以便通过 RMI 和本地 bean 创建两个 bean？
回答by Septem
@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 也是组件扫描的候选对象，因此您可以通过以下方式扫描 RmiContext 中的所有 bean 和控制器包中的所有控制器：
@Configuration
@ComponentScan(basePackages = {"org.example.controllers", "package.of.RmiContext"})
public class MainContext {
}
--edit--
- 编辑 -
@Configuration is a candidate for component scan, here is the test case that works in my pc:
@Configuration 是组件扫描的候选对象，这是在我的电脑上运行的测试用例：
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);
}
}
回答by Shamim Ahmmed
May be you could try using the base packages of your classes (RMI, Controller):
也许你可以尝试使用你的类的基本包（RMI，控制器）：
@ComponentScan(basePackages = {"your controller package", "your rmi package"})
If the RMI classes package is different than controller then they will fail to instantiate by spring.
如果 RMI 类包与控制器不同，那么它们将无法通过 spring 实例化。
回答by Jesus Angeles
If I understand you correctly, you use "@ComponentScan(basePackageClasses" but it is not detecting and registering your spring beans?
如果我理解正确，您使用“@ComponentScan(basePackageClasses”但它没有检测和注册您的 spring bean？
I had the same issue a few minutes ago. I did not give up and tried all funny guesses. One guess did it.
几分钟前我遇到了同样的问题。我没有放弃并尝试了所有有趣的猜测。一个猜测做到了。
I had to add an XML component-scan entry in XML. I just put a dummy package there, like below:
我必须在 XML 中添加一个 XML 组件扫描条目。我只是在那里放了一个虚拟包，如下所示：
component-scan base-package="dummy.filler.to.enable.component.scan"
It seems that the component-scan in XML enables the @ComponentScan.
XML 中的组件扫描似乎启用了@ComponentScan。
[Late Edit: I noticed, my spring xml schema is spring 2.5. Anyway, I dont know if this matters. Best Regards.]
[后期编辑：我注意到，我的 spring xml 架构是 spring 2.5。无论如何，我不知道这是否重要。此致。]
