从ajax中的服务器响应获取excel文件(.xlsx)

I have got a problem with getting excel file and opening download window in the browser after getting a response (in success ajax method) with that file. I have got appropriate Content-Type and Content-Disposition headers, I tried using Blob in js and I couldn't achieve what I want - simple file downloading.
I accomplished few versions of my ajax, one of them is below. I developed ajax which returns excel file which I couldn't open properly because it's corrupted (despite .xlsx extension).

在获得了该文件的响应(成功ajax方法)之后，我在浏览器中获得了excel文件和打开下载窗口的问题。我有适当的内容类型和内容配置头，我尝试在js中使用Blob，但我无法实现我想要的——简单的文件下载。我完成了ajax的几个版本，其中一个在下面。我开发了ajax，它返回excel文件，我无法正确打开该文件，因为它已被损坏(尽管有.xlsx扩展名)。

Maybe the problem is with inappropriate data type used in Blob constructor?

可能问题是Blob构造函数中使用了不合适的数据类型?

I tried using "xhr.response" instead of "data" from success method arguments but it doesn't work too. I checked Response Headers in Developer Tools in Chrome and they are set properly.
The important thing - all the excel workbooks created on the server side is correct because it worked in the previous version when data was sent in URL, not in ajax post.

我试着使用“xhr。响应“而不是成功方法参数的“数据”，但它也不起作用。我在Chrome中检查了开发者工具的响应头，它们被正确设置。重要的是，在服务器端创建的所有excel工作簿都是正确的，因为在以前的版本中，数据是在URL中发送的，而不是在ajax post中。

Controller method in Java/Spring server side below:

Java/Spring服务器端控制器方法:

response.reset();
response.setContentType("application/vnd.ms-excel");
response.addHeader("Content-Disposition","attachment;filename=\"" + className + " " +  title + ".xlsx\"");
    try (ServletOutputStream output = response.getOutputStream()){
        workbook.write(output);
        output.flush();
    } catch (Exception e) {
        throw new RuntimeException(e);
    }

My Ajax to download file and open download window:

我的Ajax下载文件和打开下载窗口:

$.ajax({
    url: myUrl,
    type: 'POST',
    data: myData,
    success: function(data, status, xhr) {
        var contentType = 'application/vnd.ms-excel';

        var filename = "";
        var disposition = xhr.getResponseHeader('Content-Disposition');
        if (disposition && disposition.indexOf('attachment') !== -1) {
            var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
            var matches = filenameRegex.exec(disposition);
            if (matches != null && matches[1]) filename = matches[1].replace(/['"]/g, '');
        }
        console.log("FILENAME: " + filename);

        try {
            var blob = new Blob([data], { type: contentType });

            var downloadUrl = URL.createObjectURL(blob);
            var a = document.createElement("a");
            a.href = downloadUrl;
            a.download = filename;
            document.body.appendChild(a);
            a.click();

        } catch (exc) {
            console.log("Save Blob method failed with the following exception.");
            console.log(exc);
        }

2 个解决方案

#1

It looks like JQuery have got some problem with dealing with the binary data from the response. I used simply XMLHttpRequest and I add all data to the URL.

看起来JQuery在处理来自响应的二进制数据时遇到了一些问题。我只使用了XMLHttpRequest，并将所有数据添加到URL。

var request = new XMLHttpRequest();
request.open('POST', url, true);
request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
request.responseType = 'blob';

request.onload = function(e) {
    if (this.status === 200) {
        var blob = this.response;
        if(window.navigator.msSaveOrOpenBlob) {
            window.navigator.msSaveBlob(blob, fileName);
        }
        else{
            var downloadLink = window.document.createElement('a');
            var contentTypeHeader = request.getResponseHeader("Content-Type");
            downloadLink.href = window.URL.createObjectURL(new Blob([blob], { type: contentTypeHeader }));
            downloadLink.download = fileName;
            document.body.appendChild(downloadLink);
            downloadLink.click();
            document.body.removeChild(downloadLink);
           }
       }
   };
   request.send();

#2

We were having absolutely the same trouble recently. For us it started to work when we add responseType: 'arraybuffer' to the ajax parameters. And it's better to use lib https://github.com/eligrey/FileSaver.js/ instead of manual clicking on the link because this tool revokes memory as well.

最近我们遇到了同样的麻烦。对于我们来说，当我们向ajax参数添加responseType: 'arraybuffer'时，它就开始工作了。最好使用lib https://github.com/eligrey/FileSaver.js/而不是手动点击链接，因为这个工具也会撤销内存。