一、报错信息

[org.springframework.web.multipart.support.MissingServletRequestPartException: Required request part ‘File’ is not present。

二、正确代码

layui.upload.render({
            elem: "#importData",
            url: ctxPath + 'xxx/upload',
            size: '800',
            accept: "file",
            exts: 'xls|xlsx',
            before: function () {
                layer.load();
                this.data = {
                    "xxId": $("#xxId").val()
                };
            },
            done: function (result) {
                ...
                layer.closeAll('loading');
            }
        });

    @ResponseBody
    @PostMapping(value = "upload")
    public String upload(@RequestParam("file") MultipartFile file) {
        if (file.isEmpty()) {
            return "上传失败，请选择文件";
        }
    }

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