how do i show error/info/fatal messages in jsp when i using spring-webflow with POJO action?

问题

i am using spring-mvc(3.2.4) and spring-webflow(2.3.2) here. i define a flow like this:

<flow>
<decision-state id="check">
    <if test="signupFlowAction.checkPrecondition(messageContext)" then="firstState" else="error" />
</decision-state>

<view-state id="firstState">
    ... 
</view-state>

<view-state id="error" view="error/bad-thing-happens">
    ...
</view-state>

i want to check some business preconditions when the flow startup, so i using a POJO to do so.

public boolean checkPrecondition(MessageContext messageContext) {

    boolean oh_snap = true;

    if (oh_snap) {
        MessageResolver mr1 = new MessageBuilder().fatal().defaultText("fatal message here.").build();
        MessageResolver mr2 = new MessageBuilder().error().defaultText("error message here.").build();
        MessageResolver mr3 = new MessageBuilder().info().defaultText("info message here.").build();

        messageContext.addMessage(mr1);
        messageContext.addMessage(mr2);
        messageContext.addMessage(mr3);
    }

    return ! oh_snap;
}

this code is fine, but i do not kown how to show the messages in jsp. spring's taglibs did't work? i tried <spring:error path="*"/> nothing happened.

回答1:

In your JSP file, try something like this:

<c:forEach items="${flowRequestContext.messageContext.allMessages}" var="message">
  <li>
    Message Source is ${message.source}
    <br>
    Message Text is ${message.text}
  </li>
</c:forEach>

回答2:

Assuming that you've got the Spring Form taglib directive specified as follows:

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>

Then I think the correct syntax to use the errors tag is:

<form:errors path="*" />

来源：https://stackoverflow.com/questions/19648882/how-do-i-show-error-info-fatal-messages-in-jsp-when-i-using-spring-webflow-with

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Spring

jsp

spring-webflow