Java 当/否则语句出现多个条件时出现JSTL错误

在我的jsp页面上遇到此错误

An unknown error has occured. 
weblogic.servlet.jsp.CompilationException: Failed to compile JSP /deployed/Student/resources/StudentUpdate.jsp
StudentUpdate.jsp:1163:3: The page failed validation from validator: "tag = 'out' / attribute = 'value': An error occurred while parsing custom action attribute "value" with value "${other_place_birth==null?'':other_place_birth}": Encountered "?", expected one of ["}", ".", ">", "gt", "<", "lt", "==", "eq", "<=", "le", ">=", "ge", "!=", "ne", "[", "+", "-", "*", "/", "div", "%", "mod", "and", "&&", "or", "||"]".
<c:when test="${birth_place_code != null && birth_place_code == '99'}">

发生未知错误。
weblogic.servlet.jsp.CompilationException:未能编译jsp/deployed/Student/resources/StudentUpdate.jsp
StudentUpdate.jsp:1163:3:该页面未能通过验证程序验证：“tag='out'/attribute='value”：解析值为“${other_-place_-birth==null？”的自定义操作属性“value”时出错。“：other_-place_-birth}”：遇到“？”，应为[“}”，“，”>，“gt”中的一个

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错误指向第一个when条件，我不确定when语句中是否允许多个条件。感谢您的帮助

否。

没有问题

<input type="text" size=41 maxlength=66 name="birthPlaceT" value="<c:out value="${other_place_birth==null?'':other_place_birth}"/>">
                                                                               ↑  

或者您可以使用

empty

运算符

<input type="text" value="${empty other_place_birth ? '' : other_place_birth}">

出生地
如有其他，请注明备注

问题在于你的c:out，而不是c:when c:out中不能有三元（或任何其他）条件。它仅用于显示值。

'=='更改为eq
'==' change to eq
<c:choose>
    <c:when test="${birth_place_code != null && birth_place_code eq '99'}"> 
        <c:out/>
    </c:when>
    <c:otherwise>
    <input type="text" size=41 value=" " disabled>
    </c:otherwise>
</c:choose>

Hi Anil，谢谢这一个对我有用…不过还有一些问题，但应该是次要的。很乐意帮助：）Hi Aniket，我喜欢这个解决方案，但是我需要使用c:out。谢谢anyway@dimas：不客气：）请不要在JSP中使用scriptlets

。我在您的问题中看到了一个。

<input type="text" value="${empty other_place_birth ? '' : other_place_birth}">

    <tr> 
<td width="17%" class=label > <b>Place of Birth</b>&nbsp; </td>
<td colspan="3" class=value> <div align="left"> <%=HtmlUtil.setListOptions("birthPlace","onchange ='javascript:SetEnabled()'",birth_place_option,birth_place_code,true,"")%> 
    if others, please specify remarks
<c:choose>
    <c:when test="${birth_place_code != null && birth_place_code == '99'}">
        <c:when test="${other_place_birth!=null}">
            <input type="text" size=41 maxlength=66 name="birthPlaceT" value="<c:out value="${other_place_birth}"/>">        
        </c:when>
        <c:otherwise>
            <input type="text" size=41 maxlength=66 name="birthPlaceT" value="">           
        </c:otherwise>
    </c:when>
    <c:otherwise>
    <input type="text" size=41 maxlength=66 name="birthPlaceT" value=" " disabled>
    </c:otherwise>
</c:choose>
  </div></td>

'==' change to eq
<c:choose>
    <c:when test="${birth_place_code != null && birth_place_code eq '99'}"> 
        <c:out/>
    </c:when>
    <c:otherwise>
    <input type="text" size=41 value=" " disabled>
    </c:otherwise>
</c:choose>