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我有一個非常簡單的用戶設置形式：調試Spring MVC的集合結合
<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，你可以設置你的時區，並以列表忘記的密碼問題提供答案。綁定到這種形式的模型對象基本上是這樣的：
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;
}
...
}
的形式顯示就好了。它提供一個下拉菜單，顯示所有支持的時區，然後是幾行問題/答案對，問題包含所有支持的問題。當我將表單提交回來時，處理失敗，因爲List<Answer> answers沒有得到表單中的值的更新。我的問題有兩個方面，第一，我做錯了什麼？其次，我將來應該如何調試這種類型的映射問題？
我試過用調試器代碼。 setTimeZone()方法正在從窗體的值調用，但方法不是setAnswers()。 Answer類的setQuestionId()或setAnswer()方法也不是。我查看了Request對象，它具有所有answer[x].questionId和answer[x].answer參數的鍵值，但不確定這些值是什麼。你會建議如何追蹤這類問題？
-------------------------- UPDATE ------------------- -------------
我剛拔掉這從調試器：
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'
]
這是什麼是包含在requestParameterMap。很明顯，它表明answers（questionId和answer）的返回值。爲什麼春天不在模型對象上調用setAnswers()（請記住setTimeZone()是被調用）？