java - 使用 Spring MVC 的绑定(bind)问题

Question

我正在使用 Spring MVC 3.1 开发 Java Web 应用程序。我有一个 JSP，它有两个配对的单选按钮、一个输入字段和一个下拉选择框。我需要通过模型类的字段将这些值提供给我的映射 Controller 。

安全性和 URL 映射工作正常，正如我之前在调试器中看到的那样。问题是，当我尝试获取填充模型的 JSP 数据值时，出现错误:

java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'cccForm' available as request attribute

这是我的 JSP 的一部分:

<c:url var="cccUrl" value="/registers/default/ccPreauth/authorize" />
    <div class="mainWrapper">
    <form:form id="cccForm" action="${cccUrl}" method="post" modelAttribute="cccForm">
  ...
<table>
    <tbody>
        <tr>
            <th>Select an option.</th>
        </tr>
        <tr>
            <td>
                <div class="field-input">
                    <form:radiobutton id="paymentOption" path="paymentOption" value="authorizeCC" />
                    Collect Credit Card Information
                </div>
                <div class="field-input">
                    Authorization Amount $
                    <form:input path="authAmount" maxlength="10" size="10" class="extendWidth"/> 
                    <span class="instructions">
                        <spring:message code="label.authorization.note" />
                    </span>
                </div>
                <div class="field-input">
                    <form:radiobutton id="paymentOption" path="paymentOption" value="cancelAuth" />
                    Choose a Reason and Cancel Credit Card Collection
                </div>
                <div class="field-input right">
                    <form:select id="selectedReason" path="selectedReason" >
                        <c:forEach items="${reasonList}" var="reason">
                            <option value=${reason.reasonText}>${reason.reasonText}</option>
                            <br />
                        </c:forEach>
                    </form:select>
                </div></td>
        </tr>
    </tbody>
</table>
</div>
<div class="right">
<button class="btnBlue" id="submitButton" type="submit">

这是我的 Controller 的一部分:

    @Controller
@RequestMapping(value = "/registers/default/ccPreauth")
@SessionAttributes(ControllerConstants.DEFAULT_REGISTER_ATTR_NM)
public class CCCaptureController {

...
    @RequestMapping(value="/authorize" )
public ModelAndView authorize(
         final Authentication auth,
         final @ModelAttribute("ccCapturePaymentRequest") CCCapturePaymentForm ccCapturePaymentRequest,
         final BindingResult result,
         final HttpServletResponse response) {

      final ModelAndView mav = new ModelAndView(CC_PREAUTH_PAYMENT_VIEW);

      return mav;
}

最后，这是我的模型类:

    public class CCCapturePaymentForm implements Serializable {

    private static final long serialVersionUID = 6839171190322687142L;
    @NumberFormat(style = Style.CURRENCY)
    private BigDecimal  authAmount;
    private String      selectedReason;
    private String      paymentOption;

    public BigDecimal getAuthAmount() {
        return authAmount;
    }

    public void setAuthAmount(BigDecimal authAmount) {
        this.authAmount = authAmount;
    }

    public String getSelectedReason() {
        return selectedReason;
    }

    public void setSelectedReason(String selectedReason) {
        this.selectedReason = selectedReason;
    }

    public String getPaymentOption() {
        return paymentOption;
    }

    public void setPaymentOption(String paymentOption) {
        this.paymentOption = paymentOption;
    }

}

谁能告诉我需要什么才能让它正常工作？请不要仅仅停留在上述异常的原因上 - 请验证并更正我的代码，因为我像往常一样日程紧张，并且对 Spring MVC 缺乏经验。谢谢!

Answer 1

您的表单中有此内容:

modelAttribute="cccForm"

所以你的 Controller 中应该有这个:

@ModelAttribute("cccForm") CCCapturePaymentForm ccCapturePaymentRequest

这就是将表单支持对象与模型属性绑定(bind)的方式。