java controller 继承_java – Spring RestController中的继承-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_29048775/article/details/114920507

在尝试让Controller_v2继承Controller_v1时，遇到了Spring的ConflictingBeanDefinitionException。问题在于相同名称的bean定义冲突。解决方法是为子类Controller_v2指定不同的bean名称，例如@RestController("controller_V2")。此外，建议为类名使用更具描述性的名称。

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我有一个Spring RestController,它处理API调用的第1版.

package rest.v1;

@RestController

@RequestMapping("v1/someResource")

public class Controller_V1 {

@RequestMapping(value = "/{resourceName}", method = RequestMethod.GET)

public Object retrieve() throws Exception {

....

}

我想要做的是创建另一个处理版本2请求的控制器.同时我想继承已经在版本1控制器中的实现.这是因为从v1到v2不变的实现将仅从v1继承.

所以像这样：

package rest.v2;

@RestController("controllerV2")

@RequestMapping("v2/someResource")

public class Controller_v2 extends Controller_v1 {

@RequestMapping(value = "/{resourceName}", method = RequestMethod.GET)

public Object retrieve() throws Exception {

//implementation overridden from v1

}

这样做会导致ConflictingBeanDefinitionException.我也不确定是否应该像上面那样扩展控制器.

我知道我可以在同一个控制器的RequestMapping中使用多个路径,如下所示：

@RestController

@RequestMapping(value = { "v1/someResource", "v1/someResource" })

public class Controller_V1 {

}

但上述情况对我的情况不起作用.

以下是控制器扩展时的堆栈跟踪：

[java] org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [rest-context.xml]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'controller_V1' for bean class [rest.v2.Controller_V2] conflicts with existing, non-compatible bean definition of same name and class [rest.v1.Controller_V1]

[java] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:413)

[java] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:335)

[java] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:303)

[java] at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)

[java] at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:216)

[java] at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:187)

[java] at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125)

[java] at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)

[java] at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)

[java] at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:540)

[java] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:454)

[java] at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:658)

[java] at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:624)

[java] at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:672)

[java] at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:543)

[java] at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:484)

[java] at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)

[java] at javax.servlet.GenericServlet.init(GenericServlet.java:158)

解决方法:

堆栈跟踪的第一行显然存在问题：

org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [rest-context.xml]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name ‘controller_V1’ for bean class [rest.v2.Controller_V2] conflicts with existing, non-compatible bean definition of same name and class [rest.v1.Controller_V1]

这是因为你让Spring为你的bean命名.默认情况下,Spring将使用bean名称作为camelCase中当前类的接口名称或超类.

所以,你有这样的东西(Spring给出的名字)：

@RestController("controller_V1") //

@RequestMapping("v1/someResource")

public class Controller_V1

@RestController("controller_V1") //

@RequestMapping("v2/someResource")

public class Controller_V2 extends Controller_V1

如您所见,您只需要重命名第二个bean：

@RestController("controller_V2")

@RequestMapping("v2/someResource")

public class Controller_V2 extends Controller_V1