確保前端資料欄位 跟 JAVA物件屬性(欄位) 一致

JQ程式碼：

//前端資料
var specListArr = new Array();
    specList = [];
if ($(this).val() != '') {
    var specInfo = {};
    specInfo.specName = specName;
    specInfo.specValue = $(this).val();
    specList.push(specInfo);
}
//specListArr物件陣列
specListArr.push(specList)

//ajax請求
 

$.ajax({
            url: appendSpec_url,                //對應請求地址：/seller/goods/appendSpec
             type: 'post',
             dataType: 'json',
             contentType: "application/json",   //必須指明請求頭型別(關鍵)
             data: JSON.stringify({             //必須將資料格式轉換為json字串格式(關鍵)
                 goodsParentId: goodsParentId,
                 specList: specListArr         //specListArr物件陣列
 

             }),
             success: function (result) {
                  ....
             }
         });

JAVA程式碼：

/**
  * AJAX追加新商品規格
  *
  * @param setGoodsSpec SetGoodsSpecDTO物件
  * @param request HttpServletRequest物件
  * @return map
  */
    @ResponseBody
    @RequestMapping(value = "/seller/goods/appendSpec"
 
)
    public Object appendSpec(@RequestBody SetGoodsSpecDTO setGoodsSpec, HttpServletRequest request) {
        SetGoodsModel setGoodsModel = new SetGoodsModel();
        setGoodsModel.setGoodsParentId(setGoodsSpec.getGoodsParentId());
        setGoodsModel.setSpecList(setGoodsSpec.getSpecList());
        GetGoodsParentResponse response = gsGoodsParentService.getGoodsInfo(setGoodsModel);

        HashMap<String, Object> map = new HashMap<String, Object>();
        List<SpecResponse> list = response.getSpecResponseList();
        map.put("goodsList", list);
        map.put("specArray", list.get(0).getSpecList());
        return map;
    }

@RequestBody SetGoodsSpecDTO ：將請求資料對映到物件，@RequestBody註解至關重要

SetGoodsSpecDTO物件(實體類)：

public class SetGoodsSpecDTO {
    private String goodsParentId;
    private List<List<GoodsSpecResponse>> specList;

    public SetGoodsSpecDTO() {
    }

    public List<List<GoodsSpecResponse>> getSpecList() {
        return this.specList;
    }

    public void setSpecList(List<List<GoodsSpecResponse>> specList) {
        this.specList = specList;
    }

    public String getGoodsParentId() {
        return this.goodsParentId;
    }

    public void setGoodsParentId(String goodsParentId) {
        this.goodsParentId = goodsParentId;
    }
}

以上針對，資料傳輸格式為：application/json

當資料傳輸格式為：
1. x-www-form-urlencoded
2. form-data
JQ 程式碼不需要使用函式: JSON.stringify()
JAVA 程式碼不需要使用註解: @RequestBody

確保post / get的資料欄位 跟 JAVA實體類屬性(欄位) 一致