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我有一个非常简单的用户设置表单：

<form:form method="post" id="fm1" cssClass="fm-v clearfix" commandName="${commandName}" htmlEscape="true">
  <div class="row fl-controls-left">
    <spring:message code="screen.userSettings.label.timeZone.accesskey" var="timeZoneAccessKey" />
    <label for="timeZone" class="fl-label"><spring:message code="screen.userSettings.label.timeZone" /></label>
    <form:select id="timeZone" path="timeZone" accesskey="${timeZoneAccessKey}">
      <form:options items="${user.supportedTimeZones}" itemLabel="label" itemValue="id" />
    </form:select>

    <c:forEach items="${user.answers}" var="answer" varStatus="loop">
      <div class="row fl-controls-left">
        <form:select path="answers[${loop.index}].questionId">
          <option value="-1"><spring:message code="screen.userSettings.question.selectOne" /></option>
          <form:options items="${user.supportedQuestions}" itemLabel="question" itemValue="id" />
        </form:select>
        <form:input path="answers[${loop.index}].answer" size="30" autocomplete="false" htmlEscape="true" type="text" cssClass="required" cssErrorClass="error"/>
      </div>
    </c:forEach>
  </div>
</form:form>

基本上，您可以设置您的时区，并提供忘记密码问题列表的答案。绑定到这个表单的模型对象基本上是这样的：

public class User implements Serializable {
    private static final long serialVersionUID = 8974875234954842283L;

    private List<Answer> answers;
    private List<Question> supportedQuestions;
    private List<TimeZone> supportedTimeZones;
    private String timeZone;

    public User() {
        credentials = new UsernamePasswordCredentials();
    }

    public List<Answer> getAnswers() {
        return answers;
    }

    public List<Question> getSupportedQuestions() {
        return supportedQuestions;
    }

    public List<TimeZone> getSupportedTimeZones() {
        return supportedTimeZones;
    }

    public String getTimeZone() {
        return timeZone;
    }

    public void setAnswers( List<Answer> answers ) {
        this.answers = answers;
    }

    public void setSupportedQuestions( List<Question> supportedQuestions ) {
        this.supportedQuestions = supportedQuestions;
    }

    public void setSupportedTimeZones( List<TimeZone> supportedTimeZones ) {
        this.supportedTimeZones = supportedTimeZones;
    }

    public void setTimeZone( String timeZone ) {
        this.timeZone = timeZone;
    }

    ...
}

表格显示得很好。它提供了一个下拉菜单，显示所有受支持的时区，后跟几行问题/答案对，问题是包含所有受支持问题的下拉菜单。当我提交回表单时，处理失败，因为List<Answer> answers没有使用表单中的值进行更新。我的问题有两个方面，首先，我做错了什么？其次，将来我应该如何调试此类映射问题？

我尝试使用调试器单步执行代码。setTimeZone()使用表单中的值调用该方法，但该setAnswers()方法不是。setQuestionId()类的orsetAnswer()方法也不是Answer。我查看了该Request对象，它具有所有answer[x].questionId和answer[x].answer参数的键，但不确定值是什么。您建议如何追踪此类问题？

- - - - - - - - - - - - - 更新 - - - - - - - - - - - - ---------

我刚刚从调试器中提取了这个：

map[
'answers[4].questionId' -> 'cn=honeymoon,ou=questions,dc=company'
'answers[2].questionId' -> 'cn=honeymoon,ou=questions,dc=company'
'answers[0].questionId' -> 'cn=firstPet,ou=questions,dc=company'
'lt' -> 'LT-786e9b77-efbd-f302-062e-90364cc4634aZe1s2'
'answers[1].answer' -> 'qwer'
'answers[3].answer' -> 'poiu'
'submit' -> 'Save'
'answers[3].questionId' -> 'cn=honeymoon,ou=questions,dc=company'
'answers[1].questionId' -> 'cn=mothersMaiden,ou=questions,dc=company'
'answers[2].answer' -> 'zxcv'
'answers[4].answer' -> 'lkjh'
'timeZone' -> 'America/New_York'
'_eventId' -> 'submit'
'answers[0].answer' -> 'asdf'
]

它是 requestParameterMap 中包含的内容。很明显，它显示为answers（questionId和answer）返回了值。为什么 spring 不调用setAnswers()模型对象（记住它setTimeZone() 被调用了）？

4

1 回答 1

1

这原来是 viewState 中的活页夹的问题。看起来这应该有效：

<binder>
  <binding property="answers" />
  <binding property="timeZone" />
</binder>

因为answers是绑定模型对象的属性。但是，我实际上必须指定列表中元素的属性：

<binder>
  <binding property="answers[0].questionId" />
  <binding property="answers[0].answer" />
  <binding property="answers[1].questionId" />
  <binding property="answers[1].answer" />
  <binding property="answers[2].questionId" />
  <binding property="answers[2].answer" />
  <binding property="answers[3].questionId" />
  <binding property="answers[3].answer" />
  <binding property="answers[4].questionId" />
  <binding property="answers[4].answer" />
  <binding property="timeZone" />
</binder>

对我来说，这将起作用（目前），因为我有固定大小的元素数量。必须包含列表中每个元素的每个属性有点痛苦，但它有效。有为此提交的错误/功能请求应该使它更容易，但在那之前......

于 2012-04-26T22:13:39.543 回答