Spring MVC ModelAttribute字段为空，而不是表单输入值

Z时代
2024-01-10
分类：问答

我正在尝试制作将发布CardRequestResource的表单：

public class CardRequestResource extends ResourceSupport{
    private Long cardRequestId;
    private String deliveryMethod;
    private String address;
    private boolean isHomeDelivery;
    private String requestDate;
    private String expectedDate;
    private String comments;
    private Long statusId;
    private PersonResource person;
    //Getters and Setters
}

在我的控制器中，我首先加载JSP并将一个空的CardRequestResource添加到ModelMap中：

@RequestMapping(value = { "", "/approval" }, method = RequestMethod.GET)
public String getApproval(ModelMap map) {
    map.put("cardRequestResource", new CardRequestResource());       
    return "cardoffice/approval";
}

我的JSP使用cardRequestResource模型属性构建表单：

<form:form id="detailForm" name="detailForm" modelAttribute="cardRequestResource">
    <form:input path="statusId" type="hidden" id="statusId" name="statusId" />
    <form:textarea path="comments" name="comments" id="commentTextarea" rows="7" cols="81" style="font-style: normal;"/>
</form:form>

Javascript函数进行AJAX调用以填充表单值：

function getCardRequestDetails(cardRequestUrl) {
    $.ajax({
        type : "GET",
        url : cardRequestUrl,
        dataType : "json",
        success : function(response) {
            loadCardRequestDetails(response);
        },
        error : function(response) {}
    });
};
function loadCardRequestDetails(cardRequest) {
    $("#statusId").attr("value", cardRequest.statusId);
    $("#commentTextarea").val(cardRequest.comments);
}

此时，用户可以更新评论文本区域，并且隐藏的输入可以根据用户在字段中输入的内容有条件地更改。然后，在提交表单时，我调用以下Javascript函数：

function postCardRequest(url) {
    var serialized = $("#detailForm").serialize();
    alert(serialized);
    $.ajax({
        type: "POST",
        url: url,
        data: serialized,
        contentType: "application/json",
        dataType: "json"                
    });
}

警报显示字段正确填充了最初由AJAX /

Javascript或用户加载的数据。但是，当我到达处理帖子的控制器中的处理程序时，CardRequestResource为非null，但其中的每个EVERLE字段都是NULL！

处理程序代码：

@RequestMapping(value = "/approval/submit", method = RequestMethod.POST)
public @ResponseBody Map<String, Object> postCardRequest(@ModelAttribute(value = "cardRequestResource") CardRequestResource cardRequestResource) {
    Map<String, Object> responseMap = new HashMap<String, Object>();
    final String success = "success";
    Boolean isSuccessful = Boolean.FALSE;
    if(cardRequestResource != null){
        isSuccessful = Boolean.TRUE;
    }
    //TODO
    System.out.println("Status: " + cardRequestResource.getStatusId() + ", Comments: " + cardRequestResource.getComments());
    responseMap.put(success, isSuccessful);
    return responseMap;
}