我在服务器端有一个Struts2操作用于文件下载。
<action name="download" class="com.xxx.DownAction">
<result name="success" type="stream">
<param name="contentType">text/plain</param>
<param name="inputName">imageStream</param>
<param name="contentDisposition">attachment;filename={fileName}</param>
<param name="bufferSize">1024</param>
</result>
</action>
然而，当我使用jQuery调用动作时:
$.post(
"/download.action",{
para1:value1,
para2:value2
....
},function(data){
console.info(data);
}
);
在Firebug中，我看到数据是用二进制流检索的。我想知道如何打开文件下载窗口，用户可以在本地保存文件?
I found a fix that while it's not actually using ajax it does allow you to use a javascript call to request the download and then get a callback when the download actually starts. I found this helpful if the link runs a server side script that takes a little bit to compose the file before sending it. so you can alert them that it's processing, and then when it does finally send the file remove that processing notification. which is why I wanted to try to load the file via ajax to begin with so that I could have an event happen when the file is requested and another when it actually starts downloading.
js在首页
function expdone()
{
document.getElementById('exportdiv').style.display='none';
}
function expgo()
{
document.getElementById('exportdiv').style.display='block';
document.getElementById('exportif').src='test2.php?arguments=data';
}
iframe
<div id="exportdiv" style="display:none;">
<img src="loader.gif"><br><h1>Generating Report</h1>
<iframe id="exportif" src="" style="width: 1px;height: 1px; border:0px;"></iframe>
</div>
然后是另一个文件:
<!DOCTYPE html>
<html>
<head>
<script>
function expdone()
{
window.parent.expdone();
}
</script>
</head>
<body>
<iframe id="exportif" src="<?php echo "http://10.192.37.211/npdtracker/exportthismonth.php?arguments=".$_GET["arguments"]; ?>"></iframe>
<script>document.getElementById('exportif').onload= expdone;</script>
</body></html>
我认为有一种方法可以使用js读取数据，这样就不需要php了。但我不知道它的手，我正在使用的服务器支持php，所以这对我有用。我想分享一下，也许能帮到别人。
这就是它在任何浏览器中都很好(我使用asp.net核心)
function onDownload() {
const api = '@Url.Action("myaction", "mycontroller")';
var form = new FormData(document.getElementById('form1'));
fetch(api, { body: form, method: "POST"})
.then(resp => resp.blob())
.then(blob => {
const url = window.URL.createObjectURL(blob);
$('#linkdownload').attr('download', 'Attachement.zip');
$('#linkdownload').attr("href", url);
$('#linkdownload')
.fadeIn(3000,
function() { });
})
.catch(() => alert('An error occurred'));
}
<button type="button" onclick="onDownload()" class="btn btn-primary btn-sm">Click to Process Files</button>
<a role="button" href="#" style="display: none" class="btn btn-sm btn-secondary" id="linkdownload">Click to download Attachments</a>
<form asp-controller="mycontroller" asp-action="myaction" id="form1"></form>
function onDownload() {
const api = '@Url.Action("myaction", "mycontroller")';
//form1 is your id form, and to get data content of form
var form = new FormData(document.getElementById('form1'));
fetch(api, { body: form, method: "POST"})
.then(resp => resp.blob())
.then(blob => {
const url = window.URL.createObjectURL(blob);
$('#linkdownload').attr('download', 'Attachments.zip');
$('#linkdownload').attr("href", url);
$('#linkdownload')
.fadeIn(3000,
function() {
});
})
.catch(() => alert('An error occurred'));
}
在Rails中，我是这样做的:
function download_file(file_id) {
let url = '/files/' + file_id + '/download_file';
$.ajax({
type: 'GET',
url: url,
processData: false,
success: function (data) {
window.location = url;
},
error: function (xhr) {
console.log(' Error: >>>> ' + JSON.stringify(xhr));
}
});
}
诀窍在于窗户。位置的部分。控制器的方法如下所示:
# GET /files/{:id}/download_file/
def download_file
send_file(@file.file,
:disposition => 'attachment',
:url_based_filename => false)
end
我尝试下载一个CSV文件，然后在下载完成后做一些事情。所以我需要实现一个适当的回调函数。
使用window.location="…"不是一个好主意，因为下载完成后我无法操作该程序。像这样，改变头，所以这不是一个好主意。
fetch是一个很好的选择，但是它不支持ie11。window.URL.createObjectURL不支持ie11。你可以参考这个。
这是我的密码，它类似于沙赫鲁克·阿拉姆的密码。但你应该注意window。url。createobjecturl可能会造成内存泄漏。你可以参考这个。当响应到达时，数据将被存储到浏览器的内存中。因此，在单击链接之前，文件已经下载。这意味着下载后你可以做任何事情。
$.ajax({
url: 'your download url',
type: 'GET',
}).done(function (data, textStatus, request) {
// csv => Blob
var blob = new Blob([data]);
// the file name from server.
var fileName = request.getResponseHeader('fileName');
if (window.navigator && window.navigator.msSaveOrOpenBlob) { // for IE
window.navigator.msSaveOrOpenBlob(blob, fileName);
} else { // for others
var url = window.URL.createObjectURL(blob);
const a = document.createElement('a');
a.style.display = 'none';
a.href = url;
a.download = fileName;
document.body.appendChild(a);
a.click();
window.URL.revokeObjectURL(url);
//Do something after download
...
}
}).then(after_download)
}
