使用blob从ajax结果下载文件

I use this code to download excel file from server.

我使用此代码从服务器下载excel文件。

$.ajax({
    headers: CLIENT.authorize(),
    url: '/server/url',
    type: 'POST',
    contentType: "application/json; charset=utf-8",
    data: JSON.stringify(jsonData),
    success: function (data) {
        alert('Data size: ' + data.length);
        var blob = new Blob([data], { type: "application/vnd.ms-excel" });
        alert('BLOB SIZE: ' + data.length);
        var URL = window.URL || window.webkitURL;
        var downloadUrl = URL.createObjectURL(blob);
        document.location = downloadUrl;
    },
});

The problem I experience is that even though data and blob sizes are identical, the moment document.location gets assigned I'm prompted to download almoste two times larger excel file. And when I try to open it, excel complains about wrong file format and opened file contains a lot of garbage, even though required text is still there.

我遇到的问题是,即使数据和blob大小相同,也会分配当时document.location,我被提示下载almoste两倍大的excel文件。当我尝试打开它时,excel会抱怨错误的文件格式,并且打开的文件包含大量垃圾,即使必需的文本仍然存在。

Any ideas what is causing this and how to avoid it?

是什么导致了这个以及如何避免它?

1 个解决方案

#1

So I solved the problem using AJAX 2. It natively supports binary streams. You can't use jQuery for that, unless you base64 encode everything, apparently.

所以我使用AJAX 2解决了这个问题。它原生支持二进制流。你不能使用jQuery,除非你对base64进行编码,显然。

Working code looks like this:

工作代码如下所示:

var xhr = new XMLHttpRequest();
xhr.open('POST', '/le/url', true);
xhr.responseType = 'blob';
$.each(SERVER.authorization(), function(k, v) {
    xhr.setRequestHeader(k, v);
});
xhr.setRequestHeader('Content-type', 'application/json; charset=utf-8');
xhr.onload = function(e) {
    preloader.modal('hide');
    if (this.status == 200) {
        var blob = new Blob([this.response], {type: 'application/vnd.ms-excel'});
        var downloadUrl = URL.createObjectURL(blob);
        var a = document.createElement("a");
        a.href = downloadUrl;
        a.download = "data.xls";
        document.body.appendChild(a);
        a.click();
    } else {
        alert('Unable to download excel.')
    }
};
xhr.send(JSON.stringify(jsonData));

Hope this helps.

希望这可以帮助。

#1