spring - 使用 ControllerClassNameHandlerMapping 发现模糊映射

Question

如何在方法之上没有显式注释的情况下将请求映射到方法？例如，以下请求:

http://somedomain:8080/SampleSpring/access/loginFailed

应该映射到

“AccessController”的“loginFailed”方法，无需对方法进行显式注释，例如:

@RequestMapping("/access/loginFailed")

这是我的 Spring 配置:

<context:component-scan base-package="com.robikcodes.samplespring"/>
<mvc:annotation-driven/>

<bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping">
        <property name="basePackage" value="com.robikcodes.samplespring.controller"/>
        <property name="caseSensitive" value="true"/>
        <property name="defaultHandler">
            <bean class="org.springframework.web.servlet.mvc.UrlFilenameViewController"/>
        </property>
</bean>   

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/views/"/>
            <property name="suffix" value=".jsp"/>
</bean>

这是我的 Controller :

@Controller
public class AccessController{

    @RequestMapping(method = RequestMethod.GET)
    public void login(ModelMap m) {}

    @RequestMapping(method = RequestMethod.GET)
    public String loginFailed(ModelMap m) {
        m.addAttribute("error", "true");
        return "access/login";
    }

    @RequestMapping(method = RequestMethod.GET)
    public String logout(ModelMap m) {
        m.addAttribute("logoutStatus","true");
        return "access/login";
    }
}

我收到以下错误(似乎只有登录方法被正确映射):

org.apache.catalina.LifecycleException: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#0': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping found. Cannot map 'accessController' bean method 
public java.lang.String com.robikcodes.samplespring.controller.AccessController.logout(org.springframework.ui.ModelMap)
to {[],methods=[GET],params=[],headers=[],consumes=[],produces=[],custom=[]}: There is already 'accessController' bean method
public void com.robikcodes.samplespring.controller.AccessController.login(org.springframework.ui.ModelMap) mapped.

Answer 1

您正在使用 ControllerClassNameHandlerMapping假设不正确；来自 Java 文档:

Implementation of HandlerMapping that follows a simple convention for generating URL path mappings from the class names of registered Controller beans as well as @Controller annotated beans.

文档没有说它也遵循方法名。比较 Controller 的“处理程序映射”的主要引用是放在方法上的 @RequestMapping 注释。因此，对于您的 Controller ，Spring 将它们读取为:

{methods=[GET],params=[],headers=[],consumes=[],produces=[],custom=[]}

对于 所有 AccessController 中定义的方法，具有以下 @RequestMapping:

@RequestMapping(method = RequestMethod.GET)

这就是您看到模棱两可的异常的原因。

据我了解，最干净的解决方案是使用@RequestMapping 的value 属性来定义不同的请求URI。不建议尝试将请求 URI 映射到方法名称的解决方案。