如何访问流外的Spring Webflow FlowScope元素？ [英] How can I access Spring Webflow FlowScope elements outside the flow?

问题描述

编辑：我没有对这个问题有所了解，所以我添加了一些细节。

我有一个Spring Webflow应用程序（版本2.3） 0.2）。我需要从其中一个步骤（不在流程本身内部）的验证中访问多个FlowScope对象。你会认为这很简单，但我无法破解它。

Spring Webflow提供了一系列特殊EL变量，可用于访问各种范围，但只有内部流本身。在自定义Spring验证器中，似乎没有任何方法可以使用它们：

  @Component 
 public class MyObjectValidator {
 
 @Autowired 
 ApplicationContext context; 
 
 public void validateMyObject（MyObject myObject，Errors errors）{
 
 FlowScope flowScope = context.someMagicFunction（）; //< ---- UNKNOWN 
 MyOtherObject otherObject = flowScope.get（otherObject）; 
 
 if（incrediblyComplexValidation（myObject，otherObject）{
 errors.rejectValue（myField，validation.fail，你的对象验证失败。）; 
} 
} 
} 
  

如你所见，在 Spring Webflow Validator 那里除了你应该验证的对象之外没有任何直接的外部链接。我需要在flowScope中找到其他对象。理想情况是通过 ApplicationContext 或其他一些环境功能必须有一种方法来获取这些其他对象。

任何人都知道答案吗？

解决方案

您可以从RequestContext获取范围bean - 特定于请求的状态当前Web应用程序上下文的上下文持有者。访问您的请求上下文验证方法是：

  import org.springframework.webflow.execution.RequestContext; 
 import org.springframework.webflow.execution.RequestContextHolder; 
 
 RequestContext requestContext = RequestContextHolder.getRequestContext（）; 
 requestContext.getFlowScope（）。get（objectYouAreLookingFor）; 
  

EDIT: I didn't get any bites on this question, so I'm adding a little more detail.

I have a Spring Webflow app (ver 2.3.2). I need to access multiple FlowScope objects from inside the validation of one of the steps (not inside the flow itself). You would think this would be simple, but I haven't been able to crack it.

Spring Webflow provides a series of special EL variables which can be used for accessing the various scopes, but only inside the flow itself. Inside a custom Spring validator, there doesn't seem to be any way to get to them:

@Component
public class MyObjectValidator {

    @Autowired
    ApplicationContext context;

    public void validateMyObject(MyObject myObject, Errors errors) {

        FlowScope flowScope = context.someMagicFunction();  //  <---- UNKNOWN  
        MyOtherObject otherObject = flowScope.get("otherObject");  

        if (incrediblyComplexValidation(myObject, otherObject) {
            errors.rejectValue("myField","validation.fail","Your object failed validation.");
        }
    }
}

As you can see, inside a Spring Webflow Validator there is no direct external linkage to anything except the object you are supposed to validate. I need to get to those other objects in the flowScope. Ideally either through the ApplicationContext or some other environmental feature there must be a way to get to these other objects.

Anyone know the answer to this?

解决方案

You can get the scope beans from RequestContext - context holder for request-specific statecurrent web application context. Access to request context in your validator method is by:

    import org.springframework.webflow.execution.RequestContext;
    import org.springframework.webflow.execution.RequestContextHolder;

    RequestContext requestContext = RequestContextHolder.getRequestContext();
    requestContext.getFlowScope().get("objectYouAreLookingFor");

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