通过ajax发送一个数据，后台从来没有收到

Question

前台通过Ajax向后台发送ID，但后台从不接收。我被这个问题困扰了一整天，真的需要你的帮助。这是我的JS和Controller以及错误信息

$('.category-wrap').on('click', '.now .delete', function (e) {
        var target = e.currentTarget;
        var pc = target.dataset.id;
        var pcId = {'pcId':pc};
        $.confirm('sure？',function () {
            $.ajax({
                url: deleteUrl,
                type: 'POST',
                data:  pcId,
                contentType: 'application/json',
                cache: false,
                success: function (data) {
                    if (data.success) {
                        $.toast('successfully delete！');
                        getList();
                    } else {
                        $.toast('Delete failed！');
                    }
                }
            });
        })
    });

@RequestMapping(value = "/removeproductcategory", method = RequestMethod.POST)
@ResponseBody
public Map<String, Object> removeProductCategory(@RequestBody Integer pcId,
                                                  HttpServletRequest request) 
{...}

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Answer 1

您发送一个 json 请求 var pcId = {'pcId':pc}; 并尝试接收一个整数 @RequestBody Integer pcId

尝试像这样定义一个 Pojo

class RequestData {
    public Integer pcId;
}

并修改控制器方法参数

@RequestMapping(value = "/removeproductcategory", method = RequestMethod.POST, consumes = "application/json" )
@ResponseBody
public Map<String, Object> removeProductCategory(@RequestBody RequestData pcId,
                                                  HttpServletRequest request)