控制器建议无法捕获异常答案

【问题标题】：Controller advice cannot catch exception控制器建议无法捕获异常
【发布时间】：2018-02-07 14:47:40
【问题描述】：

我对 Spring MVC 比较陌生，我目前需要为 Web 服务包含一个身份验证拦截器。如果身份验证失败，我需要拦截器抛出 AccessForbiddenException，如果通过则返回 true。我还创建了一个 AuthenticationExceptionController 来捕获异常并返回一个带有 HttpStatus 的 ResponseEntity。但是，当我遇到内部错误 500 时，我怀疑这是由于 AuthenticationExceptionController 无法捕获异常。以下是我的代码。关于如何解决它的任何建议？

AuthenticationInterceptor.java

package path.controller;

public class AuthenticationInterceptor implements HandlerInterceptor {
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        // handle the authentication check 

        if(authentication fails) {
            throw new AccessForbiddenException("access forbidden");
        } 
        return true;
     }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
        throws Exception {
    }
}

AccessForbiddenException.java

package path.controller;

public class AccessForbiddenException extends RunTimeException{
    public AccessForbiddenException(String message) {
        super(message);
    }
}

AuthenticationExceptionController.java

package path.controller;

@ControllerAdvice
public class AuthenticationExceptionController {    

    @ExceptionHandler(AccessForbiddenException.class)
    public ResponseEntity<?> handleException(AccessForbiddenException e) {
        return new ResponseEntity<String>(e.getMessage(), HttpStatus.FORBIDDEN);
    }
}

root-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/context 
                        http://www.springframework.org/schema/context/spring-context.xsd
                        http://www.springframework.org/schema/tx
                        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <context:annotation-config />
    <bean id="contextApplicationContextProvider" class="path.context.provider.ApplicationContextProvider"></bean>

    <context:property-placeholder location="classpath:application.properties" />

    <context:component-scan base-package="path.**" />
</beans>

servlet-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">

    <context:property-placeholder location="classpath:application.properties" />

    <context:annotation-config />

    <annotation-driven />

    <view-controller path="" view-name="index.html" />

    <resources mapping="**" location="/" />

    <beans:bean 
  class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/" />
        <beans:property name="suffix" value="" />
    </beans:bean>

    <interceptors>
        <interceptor>
            <mapping path="/**" />
            <exclude-mapping path="/login"/>
            <exclude-mapping path="/authenticate"/>
            <beans:bean class="path.controller.AuthenticationInterceptor" />
        </interceptor>
    </interceptors>

    <context:component-scan base-package="path" use-default-filters="false">
        <context:include-filter expression="path.Controller" type="annotation" />
    </context:component-scan>
</beans:beans>

【问题讨论】：

1.如果您是新手，请不要从 Spring XML 开始；世界已经向前发展。 2. 发布 500 错误。 3. 发布堆栈跟踪，其中有一个。 4. 发布请求。

标签： java spring spring-mvc exception-handling

【解决方案1】：

@ControllerAdvice 仅捕获在控制器级别引发的异常。

因此，如果在控制器调用之前在 auth 级别抛出异常是徒劳的。

相反，您可以尝试在 auth 之前添加一个过滤器，并在过滤器中捕获异常。

【讨论】：