使用blob从ajax结果下载文件 [英] Downloading file from ajax result using blob

问题描述

我使用此代码从服务器下载excel文件。

I use this code to download excel file from server.

$.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;
    },
});

我遇到的问题是即使数据和blob大小相同，document.location的时刻也会得到分配我提示下载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，即使所需文本仍然存在。

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.

任何想法是什么导致这种情况以及如何避免它？

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

推荐答案

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。

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.

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));

希望这有帮助。

这篇关于使用blob从ajax结果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！