若依单文件上传及跳转页面（将base64Url转换为blob格式）

java:

   /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    @ResponseBody
    public AjaxResult uploadFile(MultipartFile file) throws Exception
    {
        System.out.println("jls");
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileName = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + fileName;
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", FileUtils.getName(fileName));
            ajax.put("originalFilename", file.getOriginalFilename());
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

html:

 $("#sureCut").on("click", function () {
         cas = $('#tailoringImg').cropper('getCroppedCanvas'); //获取被裁剪后的canvas
        base64url = cas.toDataURL('image/png'); //转换为base64地址形式
        base64url = base64url.replace("\r", "");
        $("#preimg").attr("src", base64url);
        //关闭裁剪框
        closeTailor();
    });
 
 
 
 
    //关闭裁剪框
    function closeTailor() {
    var data = new FormData();
//dataURLtoBlob(base64url )将base64格式转为blob格式
        data.append("file",dataURLtoBlob(base64url ));
        console.log(data)
        $.ajax({
            type: "POST",
            url: "/common/upload",
            data: data,
            async: false,
            cache: false,
            contentType: false,
            processData: false,
            dataType: 'json',
            success: function (result) {
                if (result.code == 0) {
                    console.log(result);
                    alert("上传成功")
                    window.location.href = "/jieHong?url=" + result.url;
 
                } else {
                    alert(result.msg);
                }
            },
 
        });
    }
//将base64Url转换为blob格式
    function dataURLtoBlob(dataUrl) {
        var arr = dataUrl.split(',');
        mime = arr[0].match(/:(.*?);/)[1];
        bstr = atob(arr[1]);
        n = bstr.length;
        u8arr = new Uint8Array(n);
        while (n--) {
            u8arr[n] = bstr.charCodeAt(n);
        }
        return new Blob([u8arr], {type: mime});
    }