如何使用 axios.post 从 webapi 下载文件

Question

我有一个复杂的对象参数，需要作为帖子发送，因为它对于查询字符串来说可能太长。post 调用要求动态生成 Excel 文件，然后异步下载。但所有这一切都发生在 React 应用程序内部。如何使用 axios.post、react 和 webapi 来做到这一点？我已确认该文件确实生成，并且下载到响应确实返回，但我不确定如何实际打开该文件。我有一个隐藏的 iframe，我试图将文件的路径 src 设置为，但我不知道要使用什么响应属性。

// webapi
[HttpPost]
public HttpResponseMessage Post([FromBody]ExcelExportModel pModel)
{
    var lFile = ProductDataModel.GetHoldingsExport(pModel);
    var lResult = new HttpResponseMessage(HttpStatusCode.OK);
    lResult.Content = new ByteArrayContent(lFile);
    lResult.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
    {
        FileName = "HoldingsGridExport.xls"
    };

    lResult.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");

    return lResult;
}

// client side api
static getHoldingsExport({ UserConfigurationID, UserID, Configurations, ViewName, SortModel, FilterModel, UserConfigType, IsDefault, LastPortfolioSearchID = null, ProductId }) {
    const filterModel = JSON.stringify(FilterModel); // saving as string as this model is dynamically generated by grid out of my control
    const sortModel = JSON.stringify(SortModel);

    let params = JSON.stringify({
        UserConfigurationID,
        UserID,
        Configurations,
        ViewName,
        filterModel,
        sortModel,
        UserConfigType,
        IsDefault,
        LastPortfolioSearchID,
        ProductId
    });

    return axiosInstance.post("/api/HoldingsExport", params);
}

// client side app call to get file
HoldingsApi.getHoldingsExport(config)
    .then(function(response) {
        debugger;
        let test = response;
    })
    .catch(error => {
        toastr.success('Failed to get export.');
    });

Answer 1

这就是我通过 Axios POSTing 实现文件下载的方式：

Axios.post("YOUR API URI", {
    // include your additional POSTed data here
    responseType: "blob"
}).then((response) => {
    let blob = new Blob([response.data], { type: extractContentType(response) }),
        downloadUrl = window.URL.createObjectURL(blob),
        filename = "",
        disposition = response.headers["content-disposition"];

    if (disposition && disposition.indexOf("attachment") !== -1) {
        let filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/,
            matches = filenameRegex.exec(disposition);

        if (matches != null && matches[1]) {
            filename = matches[1].replace(/['"]/g, "");
        }
    }

    let a = document.createElement("a");
    if (typeof a.download === "undefined") {
        window.location.href = downloadUrl;
    } else {
        a.href = downloadUrl;
        a.download = filename;
        document.body.appendChild(a);
        a.click();
    }
}).catch((error) => {
    // ...
});