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?
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'));
}
这是使用MVC时的工作代码，你从控制器中获取文件
假设你有你的字节数组声明和填充，你唯一需要做的是使用文件函数(使用System.Web.Mvc)
byte[] bytes = .... insert your bytes in the array
return File(bytes, System.Net.Mime.MediaTypeNames.Application.Octet, "nameoffile.exe");
然后，在同一个控制器中，添加这两个函数
protected override void OnResultExecuting(ResultExecutingContext context)
{
CheckAndHandleFileResult(context);
base.OnResultExecuting(context);
}
private const string FILE_DOWNLOAD_COOKIE_NAME = "fileDownload";
/// <summary>
/// If the current response is a FileResult (an MVC base class for files) then write a
/// cookie to inform jquery.fileDownload that a successful file download has occured
/// </summary>
/// <param name="context"></param>
private void CheckAndHandleFileResult(ResultExecutingContext context)
{
if (context.Result is FileResult)
//jquery.fileDownload uses this cookie to determine that a file download has completed successfully
Response.SetCookie(new HttpCookie(FILE_DOWNLOAD_COOKIE_NAME, "true") { Path = "/" });
else
//ensure that the cookie is removed in case someone did a file download without using jquery.fileDownload
if (Request.Cookies[FILE_DOWNLOAD_COOKIE_NAME] != null)
Response.Cookies[FILE_DOWNLOAD_COOKIE_NAME].Expires = DateTime.Now.AddYears(-1);
}
然后你将能够调用你的控制器来下载并获得"success"或"failure"回调
$.fileDownload(mvcUrl('name of the controller'), {
httpMethod: 'POST',
successCallback: function (url) {
//insert success code
},
failCallback: function (html, url) {
//insert fail code
}
});
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'));
}
这是我所做的，纯javascript和html。没有测试，但这应该在所有浏览器工作。
Javascript函数
var iframe = document.createElement('iframe');
iframe.id = "IFRAMEID";
iframe.style.display = 'none';
document.body.appendChild(iframe);
iframe.src = 'SERVERURL'+'?' + $.param($scope.filtro);
iframe.addEventListener("load", function () {
console.log("FILE LOAD DONE.. Download should start now");
});
只使用所有浏览器都支持的组件，不添加其他组件
库。
下面是我的服务器端JAVA Spring控制器代码。
@RequestMapping(value = "/rootto/my/xlsx", method = RequestMethod.GET)
public void downloadExcelFile(@RequestParam(value = "param1", required = false) String param1,
HttpServletRequest request, HttpServletResponse response)
throws ParseException {
Workbook wb = service.getWorkbook(param1);
if (wb != null) {
try {
String fileName = "myfile_" + sdf.format(new Date());
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.setHeader("Content-disposition", "attachment; filename=\"" + fileName + ".xlsx\"");
wb.write(response.getOutputStream());
response.getOutputStream().close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
