1

我在 JSTL 文件中有下一个代码：

<c:choose>
    <c:when test="${application.lodging eq 'F'}"><bean:message key="courseapplication.lodgingF"/></c:when>
    <c:when test="${application.lodging eq 'H'}"><bean:message key="courseapplication.lodgingH"/></c:when>
    <c:when test="${application.lodging eq 'B'}"><bean:message key="courseapplication.lodgingB"/></c:when>
</c:choose>

$application.lodging 是 F 但我收到下一个错误：

SEVERE: ServletException in '/administration/jsp/applications.jsp': An exception occured trying to convert String "F" to type "java.lang.Long"
org.apache.jasper.JasperException: Exception in JSP: /administration/jsp/applications.jsp:20

17: <h2><a href="application.do?id=${application.id}&amp;type=S">${application.name}</a></h2>
18: <h3>
19: <c:choose>
20:     <c:when test="${application.lodging eq 'F'}"><bean:message key="courseapplication.lodgingF"/></c:when>
21:     <c:when test="${application.lodging eq 'H'}"><bean:message key="courseapplication.lodgingH"/></c:when>
22:     <c:when test="${application.lodging eq 'B'}"><bean:message key="courseapplication.lodgingB"/></c:when>
23: </c:choose>

在我使用 Apache Tomcat 6.0 的本地服务器中，这段代码没有出现任何问题。

在我的带有 tomcat 5.5 的应用程序服务器中出现上述错误。

有谁知道为什么会这样？

如果我使用==而不是eq ，也会发生同样的情况 

SEVERE: ServletException in '/administration/jsp/applications.jsp': An exception occured trying to convert String "F" to type "java.lang.Long"
org.apache.jasper.JasperException: Exception in JSP: /administration/jsp/applications.jsp:20

17: <h2><a href="application.do?id=${application.id}&amp;type=S">${application.name}</a></h2>
18: <h3>
19: <c:choose>
20:     <c:when test="${application.lodging=='F'}"><bean:message key="courseapplication.lodgingF"/></c:when>
21:     <c:when test="${application.lodging=='H'}"><bean:message key="courseapplication.lodgingH"/></c:when>
22:     <c:when test="${application.lodging=='B'}"><bean:message key="courseapplication.lodgingB"/></c:when>
23: </c:choose>
4

2 回答 2

1

异常表示这application.lodging是数字，而不是字符串。那正确吗？在这种情况下，您可能需要先将“F”、“H”、“B”字符串转换为数字（您想比较字符吗？）

于 2009-01-19T19:03:14.430 回答
0

您是否尝试按照此答案中的建议对字符串进行简单比较？

<c:when test="${application.lodging=='F'}"><bean:message key="courseapplication.lodgingF"/></c:when>

可能在两种环境中都可以工作...

于 2009-01-16T12:42:46.903 回答