java - 如何捕获从@Around 抛出的连接点中的异常

Question

跟进这个comment我之前的问题。我试图从 @Around 建议中抛出异常，并在被调用者类和/或方法中捕获它。但是我收到了这个错误:

Stacktraces

java.lang.Exception: User not authorized
    com.company.aspect.AuthorizeUserAspect.isAuthorized(AuthorizeUserAspect.java:77)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:616)
    ...

Aspect 代码是:

@Aspect
public class AuthorizeUserAspect {
    @AuthoWired
    private UserService service;

    @Pointcut("@annotation(module)")
    public void authorizeBeforeExecution(AuthorizeUser module) {}

    @Around(value = "authorizeBeforeExecution(module)", argNames="module")
    public Object isAuthorized(ProceddingJoinPoint jp, AuthorizeUser module) throws Throwable {
        // Check if the user has permission or not
        service.checkUser();

        if ( /* User has NOT permission */ ) {
            throw new MyCustomException("User not authorized"); // => this is line 77
        }

        return jp.proceed();
    }
}

基于 Struts 的 UI 操作代码是:

@Component
public class DashboardAction extends ActionSupport {
    @Override
    @AuthorizeUser
    public String execute() {
        ...
    }

    private void showAccessDenied() {
       ...
    }
}

问题是我如何或在何处捕获该异常以执行 showAccessDenied()？

Answer 1

要处理未捕获的异常，如 MyCustomException，您需要在 Struts 2 中定义一个全局异常处理程序。请查看本指南:http://struts.apache.org/2.3.4.1/docs/exception-handling.html