用jQuery下载一个文件。Ajax

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?

当前回答

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")'; 
            //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'));                 

        }

2020-03-23 01:02:53

其他回答

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")'; 
            //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'));                 

        }

2020-03-23 01:02:53

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

2017-05-31 19:07:52

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。

2018-01-23 01:10:47

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
            }
        });

2014-01-30 18:12:50

让浏览器下载文件的简单方法是像这样发出请求:

 function downloadFile(urlToSend) {
     var req = new XMLHttpRequest();
     req.open("GET", urlToSend, true);
     req.responseType = "blob";
     req.onload = function (event) {
         var blob = req.response;
         var fileName = req.getResponseHeader("fileName") //if you have the fileName header available
         var link=document.createElement('a');
         link.href=window.URL.createObjectURL(blob);
         link.download=fileName;
         link.click();
     };

     req.send();
 }

这将打开浏览器下载弹出。

2017-03-16 09:42:37

用jQuery下载一个文件。Ajax

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