Question

大家好！

我试图用Spring roo实现文件上传。文件路径将保留在数据库中，文件将保存在文件系统中。根据spring dveloper board上的信息，我修改了input.tagx和create.tagx文件。（info：https://jira.springsource.org/browse/ROO-442） input.tagx：

<jsp:root xmlns:c="http://java.sun.com/jsp/jstl/core"             xmlns:fn="http://java.sun.com/jsp/jstl/functions"      xmlns:spring="http://www.springframework.org/tags" xmlns:form="http://www.springframework.org/tags/form" xmlns:jsp="http://java.sun.com/JSP/Page" version="2.0">
<jsp:output omit-xml-declaration="yes" />

<jsp:directive.attribute name="id" type="java.lang.String" required="true" rtexprvalue="true" description="The identifier for this tag (do not change!)" />
<jsp:directive.attribute name="field" type="java.lang.String" required="true" rtexprvalue="true" description="The field exposed from the form backing object" />
<jsp:directive.attribute name="label" type="java.lang.String" required="false" rtexprvalue="true" description="The label used for this field, will default to a message bundle if not supplied" />
<jsp:directive.attribute name="labelCode" type="java.lang.String" required="false" rtexprvalue="true" description="Key for label message bundle if label is not supplied" />
<jsp:directive.attribute name="required" type="java.lang.Boolean" required="false" rtexprvalue="true" description="Indicates if this field is required (default false)" />
<jsp:directive.attribute name="disabled" type="java.lang.Boolean" required="false" rtexprvalue="true" description="Specify if this field should be enabled" />
<jsp:directive.attribute name="validationRegex" type="java.lang.String" required="false" rtexprvalue="true" description="Specify regular expression to be used for the validation of the input contents" />
<jsp:directive.attribute name="validationMessageCode" type="java.lang.String" required="false" rtexprvalue="true" description="Specify the message (message property code) to be displayed if the regular expression validation fails" />
<jsp:directive.attribute name="validationMessage" type="java.lang.String" required="false" rtexprvalue="true" description="Specify the message to be displayed if the regular expression validation fails" />

<c:if test="${empty render or render}"
   <c:when test="${disableFormBinding}">
   <input id="_${field}_id" name="${field}" type="${type}"/>
    </c:when>
    <c:otherwise>
<!-- currently (spring 3.0.3), form:input doesn't support type attribute -->
<!-- <form:input id="_${field}_id" path="${field}" disabled="${disabled}"/> -->
<input id="_${field}_id" name="${field}" type="${type}"/>
<br/>
<form:errors cssClass="errors" id="_${field}_error_id" path="${field}"/>
</c:otherwise>    
    <c:if test="${empty disabled}">
      <c:set value="false" var="disabled" />
    </c:if>

<c:if test="${empty label}">
  <c:if test="${empty labelCode}">
    <c:set var="labelCode" value="${fn:substringAfter(id,'_')}" />
  </c:if>


    <spring:message code="label_${fn:toLowerCase(labelCode)}" var="label" htmlEscape="false" />
    </c:if>

    <c:if test="${empty validationMessage}">
      <c:choose>
        <c:when test="${empty validationMessageCode}">
          <spring:message arguments="${fn:escapeXml(label)}" code="field_invalid" var="field_invalid" htmlEscape="false" />
        </c:when>
        <c:otherwise>
          <spring:message arguments="${fn:escapeXml(label)}" code="${validationMessageCode}" var="field_invalid" htmlEscape="false" />
        </c:otherwise>
      </c:choose>
    </c:if>

    <c:if test="${empty required}">
      <c:set value="false" var="required" />
    </c:if>

    <c:set var="sec_field">
      <spring:escapeBody javaScriptEscape="true" >${field}</spring:escapeBody>
    </c:set>

    <div id="_${fn:escapeXml(id)}_id">
      <label for="_${sec_field}_id">
        <c:out value="${fn:escapeXml(label)}" />
        :
      </label>
      <c:choose>
        <c:when test="${disableFormBinding}">
          <input id="_${sec_field}_id" name="${sec_field}" type="${fn:escapeXml(type)}" />
        </c:when>
        <c:otherwise>
          <c:choose>
            <c:when test="${type eq 'password'}">
              <form:password id="_${sec_field}_id" path="${sec_field}" disabled="${disabled}" />
            </c:when>
            <c:otherwise>
              <form:input id="_${sec_field}_id" path="${sec_field}" disabled="${disabled}" />
            </c:otherwise>
          </c:choose>
          <br />
          <form:errors cssClass="errors" id="_${sec_field}_error_id" path="${sec_field}" />
        </c:otherwise>
      </c:choose>
      <c:choose>
        <c:when test="${required}">
          <spring:message code="field_required" var="field_required" htmlEscape="false" />
          <spring:message argumentSeparator="," arguments="${label},(${field_required})" code="field_simple_validation" var="field_validation" htmlEscape="false" />
        </c:when>
        <c:otherwise>
          <spring:message argumentSeparator="," arguments="${label}, " code="field_simple_validation" var="field_validation" htmlEscape="false" />
        </c:otherwise>
      </c:choose>
      <c:set var="sec_field_validation">
        <spring:escapeBody javaScriptEscape="true">${field_validation}</spring:escapeBody>
      </c:set>
      <c:set var="sec_field_invalid">
        <spring:escapeBody javaScriptEscape="true" htmlEscape="true">${field_invalid}</spring:escapeBody>
      </c:set>
      <c:set var="sec_field_required">
        <spring:escapeBody javaScriptEscape="true">${field_required}</spring:escapeBody>
      </c:set>
      <c:set var="sec_validation_regex" value="" />
      <c:if test="${!empty validationRegex}">
        <c:set var="sec_validation_regex" value="regExp : '${validationRegex}', " />
      </c:if>
      <script type="text/javascript">
        Spring.addDecoration(new Spring.ElementDecoration({elementId : '_${sec_field}_id', widgetType : 'dijit.form.ValidationTextBox', widgetAttrs : {promptMessage: '${sec_field_validation}', invalidMessage: '${sec_field_invalid}', required : ${required}, ${sec_validation_regex} missingMessage : '${sec_field_required}' }})); 
      </script>
    </div>
    <br />
  </c:if>
</jsp:root>

create.tagx：

<jsp:root xmlns:c="http://java.sun.com/jsp/jstl/core" xmlns:fn="http://java.sun.com/jsp/jstl/functions" xmlns:util="urn:jsptagdir:/WEB-INF/tags/util" xmlns:form="http://www.springframework.org/tags/form" xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:spring="http://www.springframework.org/tags" version="2.0">
  <jsp:output omit-xml-declaration="yes"/>

  <jsp:directive.attribute name="id" type="java.lang.String" required="true" rtexprvalue="true" description="The identifier for this tag (do not change!)"/>
  <jsp:directive.attribute name="modelAttribute" type="java.lang.String" required="true" rtexprvalue="true" description="The name of the model attribute for form binding"/>
  <jsp:directive.attribute name="path" type="java.lang.String" required="true" rtexprvalue="true" description="Specify the relative URL path (wit leading /)" />
  <jsp:directive.attribute name="compositePkField" type="java.lang.String" required="false" rtexprvalue="true" description="The field name of the composite primary key (only used if a composite PK is present in the form backing object)" />
  <jsp:directive.attribute name="multipart" type="java.lang.Boolean" required="false" rtexprvalue="true" description="Indicate if this is a multipart form (default: false)" />
  <jsp:directive.attribute name="label" type="java.lang.String" required="false" rtexprvalue="true" description="The label used for this object, will default to a message bundle if not supplied"/>
  <jsp:directive.attribute name="render" type="java.lang.Boolean" required="false" rtexprvalue="true" description="Indicate if the contents of this tag and all enclosed tags should be rendered (default 'true')" />
  <jsp:directive.attribute name="openPane" type="java.lang.Boolean" required="false" rtexprvalue="true" description="Control if the title pane is opened or closed by default (default: true)"/>
  <jsp:directive.attribute name="z" type="java.lang.String" required="false" description="Used for checking if element has been modified (to recalculate simply provide empty string value)"/>
  <jsp:directive.attribute name="enctype" type="java.lang.String" required="false" description="Used to set the enctype, e.g. multipart/form-data for file upload support. "/>
  <c:if test="${empty render or render}">
    <c:if test="${empty label}">
      <spring:message code="label_${fn:toLowerCase(fn:substringAfter(id,'_'))}" var="label" htmlEscape="false" />
    </c:if>

    <!--<c:set var="enctype" value="application/x-www-form-urlencoded"/> -->
    <form:form action="${form_url}" method="POST" modelAttribute="${modelAttribute}" enctype="${enctype}">
    </form:form>
    <c:if test="${multipart}">
      <c:set var="enctype" value="multipart/form-data"/>
    </c:if>
    <spring:message arguments="${label}" code="entity_create" var="title_msg" htmlEscape="false" />
    <util:panel id="${id}" title="${title_msg}" openPane="${openPane}">
      <spring:url value="${path}" var="form_url"/>
      <c:set var="jsCall" value=""/>
      <c:if test="${not empty compositePkField}">
        <c:set var="jsCall" value="encodePk()" />
      </c:if>
      <form:form action="${form_url}" method="POST" modelAttribute="${modelAttribute}" enctype="${enctype}" onsubmit="${jsCall}">
        <form:errors cssClass="errors" delimiter="&lt;p/&gt;"/>
        <c:if test="${not empty compositePkField}">
          <form:hidden id="_${fn:escapeXml(compositePkField)}_id" path="${fn:escapeXml(compositePkField)}" />
          <script type="text/javascript">
          <![CDATA[
            dojo.require("dojox.encoding.base64");
            function encodePk() {
              var obj = new Object();
              dojo.query("input[name^=\"${compositePkField}.\"]").forEach(function(node, index, nodelist){
                obj[node.name.substring('${compositePkField}'.length + 1)] = node.value;
              });
              var json = dojo.toJson(obj);
              var tokArr = [];
              for (var i = 0; i < json.length; i++) {
                tokArr.push(json.charCodeAt(i));
              }
              var encoded = dojox.encoding.base64.encode(tokArr);
              dojo.byId('_${fn:escapeXml(compositePkField)}_id').value = encoded;
            }
          ]]>
          </script>
        </c:if>
        <jsp:doBody />
        <div class="submit" id="${fn:escapeXml(id)}_submit">
          <spring:message code="button_save" var="save_button" htmlEscape="false" />
          <script type="text/javascript">Spring.addDecoration(new Spring.ValidateAllDecoration({elementId:'proceed', event:'onclick'}));</script>
          <input id="proceed" type="submit" value="${fn:escapeXml(save_button)}"/>
        </div>
      </form:form>
    </util:panel>
  </c:if>
</jsp:root>

我的问题是我得到了一个错误的错误：

javax.servlet.jsp.JspTagException: Illegal use of &lt;when&gt;-style tag without &lt;choose&gt; as its direct parent
    at org.apache.taglibs.standard.tag.common.core.WhenTagSupport.doStartTag(WhenTagSupport.java:95)
    at org.apache.jsp.tag.web.form.fields.input_tagx._jspx_meth_c_005fwhen_005f0(input_tagx.java:519)
    at org.apache.jsp.tag.web.form.fields.input_tagx.doTag(input_tagx.java:325)
    at org.apache.jsp.WEB_002dINF.views.pphotoes.create_jspx._jspx_meth_field_005finput_005f0(create_jspx.java:172)
    at org.apache.jsp.WEB_002dINF.views.pphotoes.create_jspx.access$2(create_jspx.java:157)

我做错了什么？（我认为我的控制器和实体文件很好，如果需要我可以发布它们）

感谢任何帮助。欢呼声。

Answer 1

正如错误消息明确指出的那样，您需要在<c:choose>标记之前使用<c:when>作为直接父标记 - 可能在input.tagx文件的以下前几行中。此外，<c:if>标记未正确关闭。

<c:if test="${empty render or render}"
    <c:when test="${disableFormBinding}">

干杯。

Spring Roo文件上传

1 个答案: