Question

我有BaseController：

@Controller
public abstract class BaseController {

    /**
     * The Logger for this class hierarchy
     */
    protected Logger logger = LoggerFactory.getLogger(this.getClass());

    @RequestMapping(value = "/ping", produces = MediaType.APPLICATION_JSON_VALUE)
    public ServiceResponse<?> ping() {
        ServiceResponse<Object> serviceResponse = new ServiceResponse<>(ResponseStatus.SUCCESS);
        return serviceResponse;
    }
}

很少有其他控制器像这样扩展这个BaseController：

@RestController
@RequestMapping(value= "/admin")
public class AdminController extends BaseController {

    @RequestMapping(
            value = "/all", 
            method = RequestMethod.GET,
            produces = MediaType.APPLICATION_JSON_VALUE)
    public ServiceResponse<List<Account>> getAll() {
        ServiceResponse<List<Account>> serviceResponse = accountService.getAll();
        return serviceResponse;
    }
}

但是当我移动ping（）资源BaseController时，我在服务器启动时遇到错误：

2016-04-23 21:31:39.862 ERROR 2335 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'clientController' method 
public ca.gatin.api.response.ServiceResponse<?> ca.gatin.api.controller.BaseController.ping()
to {[/admin/ping],produces=[application/json]}: There is already 'adminController' bean method
public ca.gatin.api.response.ServiceResponse<?> ca.gatin.api.controller.BaseController.ping() mapped.
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at ca.gatin.TodoAppApplication.main(TodoAppApplication.java:10) [classes/:na]

只是，我不想在多个控制器中复制ping（）资源。如何正确地将它移动到BaseController？

Answer 1

我觉得你正在使用另一个

class ClientController extends BaseController

ClientController和AdminController都映射/ ping到它们继承的方法ping（）。 Spring只能映射/ ping到其中一个，这就是你获得异常的原因。

你正在写

我不想在多个控制器中复制ping（）资源

并且没有必要这样做。将你的ping（）方法放在自己的控制器中，将它从BaseControler中移除，就可以了。

无论如何，我不会在控制器中重新使用继承，它使事情变得更复杂而不是它有用。

如何创建通用＆＃39; / ping＆＃39;抽象BaseController中的API资源？

1 个答案: