Spring Web Flow异常处理 [英] Spring Web Flow exception handling

问题描述

如何预防异常， requestParameters.sortBy是作为字符串(java.lang.NumberFormatException)传递还是缺少(java.lang.NullPointerException)?

How to prevent exception, if requestParameters.sortBy is passed as string (java.lang.NumberFormatException) or is missing (java.lang.NullPointerException)?

<view-state id="journeySearch" model="journeyForm">

     ...

    <transition on="sort">
        <set name="journeyCriteria.sortBy" value="requestParameters.sortBy" type="int" />
        <evaluate expression="bookingService.searchJourneys(journeyCriteria)" result="viewScope.journeys" /> 
    </transition>
</view-state>

推荐答案

requestParameters.sortBy如果不存在，则为null，但不应抛出NullPointerException

requestParameters.sortBy will be null if it doesn't exist, but it should not throw a NullPointerException

关于NumberFormatException，您可以使用类似的东西:

about the NumberFormatException, you could use something like that:

<global-transitions>
    <transition on-exception="java.lang.NumberFormatException" to=""/>
</global-transitions>

您还可以实现自己的异常处理程序，并将其与<exception-handler bean=""/>一起使用，您可以在流或状态级别使用它.

you could also implement your own exception-handler and use it with <exception-handler bean=""/> you can use it at the flow or state level.

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