通过Spring MVC使用ajax（）POST请求下载文件 [英] download file with ajax() POST Request via Spring MVC

问题描述

我尝试下载文件。该操作由ajax（）发布请求触发。请求以json格式将数据发送到控制器。控制器生成文件（字节）并将其发回。

I try to download a file. The action is triggered by ajax() Post Request. The Request sends Data in json format to the controller. The controller generate the file (bytes) and send it back.

java脚本：

function getLicenseFile() {
    $.ajax({
        type: 'POST',
        url: '<%=request.getContextPath()%>/licenses/rest/downloadLicenseFile',
        dataType: 'json',
        contentType: 'application/json;charset=UTF-8',
        data: ko.mapping.toJSON(licenseModel),
        success: function (data) {
            console.log("in sucess")
        },
        error:function (xhr, ajaxOptions, thrownError){
            console.log("in error")
        } 
    });
}  

控制器：

@RequestMapping(value = "/licenses/rest/downloadLicenseFile", method = RequestMethod.POST)
    @ResponseStatus(value=HttpStatus.OK)
    @ResponseBody
    public void createLicenseFile(@Valid @RequestBody License license, HttpServletResponse response) throws Exception {

        logger.debug("Contoller License in: "+ license);

        byte[] licensedata = licenseEncodeDefaultService.createLicenseFile(license);
        logger.debug("licenseData: " + new String(licensedata));

        response.setHeader("Content-Disposition", "attachment; filename=\"" + license.getCustomer() + ".license\"");
        response.getOutputStream().write(licensedata);
        response.flushBuffer();
    }

问题：

*浏览器应该打开一个下载框，但它不会发生 -
*响应是在错误处理的：ajax函数部分（但http状态正常）

Problem:
* The Browser should open a download box, but it will not happed
* The response is handled in the error: section of ajax function (but the http Status is OK)

那么我错了什么或者这样做的正确方法是什么？

So what do I wrong or what is the proper way to do this?

推荐答案

只需发送一个文件的URL作为回应，然后在 success 回调中访问它。

Just send a URL of file in response and then "visit" it in your success callback.

function getLicenseFile() {
    $.ajax({
        type: 'POST',
        url: '<%=request.getContextPath()%>/licenses/rest/downloadLicenseFile',
        dataType: 'json',
        contentType: 'application/json;charset=UTF-8',
        data: ko.mapping.toJSON(licenseModel),
        success: function (data) {
            window.open(data.fileUrl);
            // or window.location.href = data.fileUrl;
        },
        error:function (xhr, ajaxOptions, thrownError) {
            console.log("in error");
        } 
    });
}

data.fileUrl 应该由服务器设置响应来说明客户端在哪里获取文件。

data.fileUrl should be set in response by server to say client where to get the file.

所以你的服务器将发送一个带有JSON的响应，如

So your server will send a response with JSON like

{
    "fileUrl": "http://mysite.com/files/0123456789"
}

这篇关于通过Spring MVC使用ajax（）POST请求下载文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！