java - Bean类[my.testapp.forms.RedeemVoucherForm]的无效属性'redeemVoucherForm'

我收到一个错误：

Invalid property 'redeemVoucherForm' of bean class [my.testapp.forms.RedeemVoucherForm]: Bean property 'redeemVoucherForm' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?

RedeemVoucherForm.java：

package my.testapp.forms;

public class RedeemVoucherForm {

    private String voucherCode;

    public String getVoucherCode() {
        return voucherCode;
    }

    public void setVoucherCode(String voucherCode) {
        this.voucherCode = voucherCode;
    }
}

在我的PageController.java中，我在调用方法model.containsAttribute（“ redeemVoucherForm”）时添加模型redeemVoucherForm：

@RequestMapping(method = RequestMethod.GET)
public String showPage(final Model model) {
    ...
    model.addAttribute("redeemVoucherForm", new RedeemVoucherForm());
    ...
    return REDIRECT_PAGE_URL;
}

@RequestMapping(value = "/redeem-voucher", method = RequestMethod.POST)
public String redeemVoucher(@Valid final RedeemVoucherForm redeemVoucherForm, final BindingResult bindingResult, final RedirectAttributes redirectModel, final Model model, HttpServletRequest request) {
    LOG.debug("<POST> Redeeming voucher...");

    return REDIRECT_PAGE_URL;
}

pageDisplay.jsp：

<c:url value="/page/redeem-voucher" var="redeemVoucherAction" />
<form:form action="${redeemVoucherAction}" method="post" commandName="redeemVoucherForm">
        <form:input cssClass="form-control" type="text" path="redeemVoucherForm.voucherCode"/>
        <button type="submit" class="btn btn-primary btn-block checkoutButton">
            <spring:theme text="Redeem Voucher"/>
        </button>
</form:form>

设置模型redeemVoucherForm后，我还能缺少什么？

最佳答案

我相信这条线

    <form:input cssClass="form-control" type="text" path="redeemVoucherForm.voucherCode"/>

应该

    <form:input cssClass="form-control" type="text" path="voucherCode"/>

path的<form:input>元素应相对于已设置为commandName的<form:form>的对象。在您的情况下，此对象是类RedeemVoucherForm的实例。

如果将路径设置为redeemVoucherForm.voucherCode，Spring将在类redeemVoucherForm上查找RedeemVoucherForm属性。它期望此值是具有voucherCode属性的某个对象，从中可以读取表单值。当然，redeemVoucherForm属性不存在，因此会出现错误。