从ajax中的服务器响应中获取excel文件(.xlsx)

Question

在使用该文件获得响应(成功ajax方法)后,我在浏览器中获取excel文件和打开下载窗口时遇到问题.我有合适的Content-Type and Content-Disposition headers,我尝试在js中使用Blob而我无法实现我想要的 - 简单的文件下载.
我完成了我的ajax的几个版本,其中一个版本在下面.我开发了ajax,它返回excel文件,因为它已损坏而无法正常打开(尽管扩展名为.xlsx).

也许问题是Blob构造函数中使用的不适当的数据类型？

我尝试使用"xhr.response"而不是成功方法参数中的"data",但它也不起作用.我在Chrome中的开发者工具中检查了响应标题,并且设置正确.
重要的是 - 在服务器端创建的所有excel工作簿都是正确的,因为它在先前版本中工作时数据是在URL中发送的,而不是在ajax发布中.

Java/Spring服务器端的控制器方法如下:

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);
    }

我的Ajax下载文件并打开下载窗口:

$.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);
        }

Answer 1

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中.

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();

Answer 2

经过如此多的搜索，从 Web API 获取具有 Unicode 内容的 Excel 文件。最后，这段代码对我有用：

$.ajax({
                type: 'GET',
                cache: false,
                url: "https://localhost:44320/WeatherForecast",
              
                xhrFields: {
                    // make sure the response knows we're expecting a binary type in return.
                    // this is important, without it the excel file is marked corrupted.
                    responseType: 'arraybuffer'
                }
            })
                .done(function (data, status, xmlHeaderRequest) {
                    var downloadLink = document.createElement('a');
                    var blob = new Blob([data],
                        {
                            type: xmlHeaderRequest.getResponseHeader('Content-Type')
                        });
                    var url = window.URL || window.webkitURL;
                    var downloadUrl = url.createObjectURL(blob);
                    var fileName = '';

                  

                    if (typeof window.navigator.msSaveBlob !== 'undefined') {
                        window.navigator.msSaveBlob(blob, fileName);
                    } else {
                        if (fileName) {
                            if (typeof downloadLink.download === 'undefined') {
                                window.location = downloadUrl;
                            } else {
                                downloadLink.href = downloadUrl;
                                downloadLink.download = fileName;
                                document.body.appendChild(downloadLink);
                                downloadLink.click();
                            }
                        } else {
                            window.location = downloadUrl;
                        }

                        setTimeout(function () {
                            url.revokeObjectURL(downloadUrl);
                        },
                            100);
                    }
                });