Struts2验证重定向操作输入 - FieldErrors已经过去了

Question

Below is my configuration for interceptors:

    <interceptors>
        <interceptor-stack name="storeStack">
            <interceptor-ref name="defaultStack"/>
            <interceptor-ref name="store">
                <param name="operationMode">STORE</param>
            </interceptor-ref>
        </interceptor-stack>

        <interceptor-stack name="retrieveStack">
            <interceptor-ref name="defaultStack"/>
            <interceptor-ref name="store">
                <param name="operationMode">RETRIEVE</param>
            </interceptor-ref>
        </interceptor-stack>

        <interceptor-stack name="appDefaultStack">
            <interceptor-ref name="defaultStack">
                <param name="exception.logEnabled">true</param>
                <param name="exception.logLevel">ERROR</param>
            </interceptor-ref>
        </interceptor-stack>
    </interceptors>

And my action:

    <action name="update/*" class="comics.comics.ComicsAction" method="view">
        <interceptor-ref name="retrieveStack" />
        <param name="key">{1}</param>
        <result>/comics/comics-chapters.jsp</result>
    </action>


    <action name="add" class="comics.comics.ChapterAction" method="add">
        <interceptor-ref name="storeStack" />
        <result type="redirectAction">
            <param name="parse">true</param>
            <param name="key">${key}</param>
            <param name="actionName">update</param>
            <param name="namespace">/comics</param>    
        </result>

        <result name="input" type="redirectAction">
            <param name="parse">true</param>
            <param name="key">${key}</param>
            <param name="actionName">update</param>
            <param name="namespace">/comics</param>    
        </result>

    </action>

In my comics-chapters.jsp page, field errors are gone. But when i change the input result to:

         <result name="input">/comics/comics-chapters.jsp</result>

field errors are displayed.

How to display field errors when my input result is an action?

Answer 1

This is because when you are using redirectAction , Struts2 is creating a new request and response object and will clear the value stack and place new request and response in the value stack so it will overwrite the previous data.

You have few options here

1. Store your messages in the action and on the redirectAction you can fetch them from the action and show them to the user.
2. use MessageStoreInterceptor

There is a long pending request for scope result which will be able to handle such use-cases, but i believe its coming in struts-3.x (aka 2.5) version.

Answer 2

try put store interceptor on top of defaultStack like this:

<interceptor-stack name="storeStack">
         <interceptor-ref name="store">
                <param name="operationMode">STORE</param>
         </interceptor-ref>
         <interceptor-ref name="defaultStack"/>

</interceptor-stack>

<interceptor-stack name="retrieveStack">
         <interceptor-ref name="store">
                <param name="operationMode">RETRIEVE</param>
         </interceptor-ref>
         <interceptor-ref name="defaultStack"/>

 </interceptor-stack>

please Always notice the order of interceptors.

Answer 3

As Umesh says the redirectAction which you have specified as result causes the error messages to be cleared from the value stack when the new action is called. Another option you have though in this case is to use the Chain result. The chain result causes another action to be called keeping all existing values in the value stack except error messages, for which you will have to use the ChainingInterceptor .
You can also see this blog post for more details on how to use the chain result and ChainingInterceptor.