抓住“死”在Spring Webflow中进行会话 [英] Catch "dead" session in Spring webflow

问题描述

我想抓住当我松开会话时抛出的异常，不仅因为会话超时（例如报告）。
此外，我希望这个处理程序将只处理该特定的异常，并且不会是全局异常处理程序或任何这样的事情。
基本上，我想抓住异常 org.springframework.web.HttpSessionRequiredException 。

I want to catch the exception thrown when I loose my session, not only because a session timeout (for reports for example). Also I want that this handler will handle only that specific exception and will not be a global exceptions handler or any thing like this. Basically, I want to catch exception org.springframework.web.HttpSessionRequiredException.

推荐答案

使用下面提到的任何解决方案，您应该能够处理异常并对其执行逻辑。

With any of the proposed solutions below you should be able to handle the exceptions and perform logic on them.

可能的解决方案：

1。可以添加一个FlowExecutionListenerAdapter，它将侦听抛出的所有异常，然后可以通过instanceof进行过滤。

1. You can add a FlowExecutionListenerAdapter that will listen to all exceptions thrown and then you can filter by instanceof.

import org.springframework.webflow.execution.FlowExecutionListenerAdapter;
import org.springframework.binding.mapping.MappingResult;
import org.springframework.webflow.engine.FlowAttributeMappingException;
import org.springframework.webflow.execution.ActionExecutionException;
import org.springframework.webflow.execution.FlowExecutionException;
import org.springframework.webflow.execution.RequestContext;

public class LoggingExceptionFlowExecutionListenerAdapter extends FlowExecutionListenerAdapter {

    @Override
    public void exceptionThrown(RequestContext context, FlowExecutionException exception) {
         if (exception instanceof HttpSessionRequiredException) {
                // do something
         } else if(exception instanceof FlowAttributeMappingException) {
                // do something else 
         }
    }
}

，您需要将其添加到您的Webflow执行器配置中：

and you need to add it in your webflow executor config:

<bean id="loggingExceptionFlowExecutionListenerAdapter" class="my.package.LoggingExceptionFlowExecutionListenerAdapter"/>

<webflow:flow-executor id="flowExecutor" flow-registry="flowRegistry">
    <webflow:flow-execution-listeners>
       <webflow:listener ref="loggingExceptionFlowExecutionListenerAdapter"        
    </webflow:flow-execution-listeners>
</webflow:flow-executor>

2。另一个解决方案是实现自己的FlowExecutionExceptionHandler。虽然它将是一个全局异常处理程序方法

2. Another solution is to implement your own FlowExecutionExceptionHandler. Although it will be a global exception handler The method

public void handle(FlowExecutionException exception,
            RequestControlContext context) { } 

将允许您访问上下文，允许您过滤许多不同的变量。另见如何实现界面FlowExecutionExceptionHandler

will allow you to have access to the context which will allow you to filter on many different variables. See also, How implement the interface FlowExecutionExceptionHandler

3。如果您使用Spring Security项目，另一个可能的解决方案是，如果您有以下配置，Spring Security将自动处理该异常：

3. Another possible solution if you are using Spring Security project I believe Spring security will handle the exception for you automatically if you have the follow config:

<security:http auto-config="true" use-expressions="true">
        <!-- rest of config omitted -->
        <security:session-management invalid-session-url="/login"/>
</security:http>

如果要捕获异常并执行逻辑，请参阅以下答案：注销/会话超时捕获弹簧安全

and if you want to catch the exception and perform logic on it see the following answer: Logout/Session timeout catching with spring security

我会推荐第三个解决方案，因为它是最少的侵入。在第三个解决方案的链接中，有几个真正的解决方案来处理会话。

I would recommend the 3rd solution as it is the least intrusive. In the 3rd solution's link there are several really elegent solutions to handling sessions.

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