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();
}
}
}
好的，基于ndpu的代码这里有一个改进的(我认为)ajax_download;-
function ajax_download(url, data) {
var $iframe,
iframe_doc,
iframe_html;
if (($iframe = $('#download_iframe')).length === 0) {
$iframe = $("<iframe id='download_iframe'" +
" style='display: none' src='about:blank'></iframe>"
).appendTo("body");
}
iframe_doc = $iframe[0].contentWindow || $iframe[0].contentDocument;
if (iframe_doc.document) {
iframe_doc = iframe_doc.document;
}
iframe_html = "<html><head></head><body><form method='POST' action='" +
url +"'>"
Object.keys(data).forEach(function(key){
iframe_html += "<input type='hidden' name='"+key+"' value='"+data[key]+"'>";
});
iframe_html +="</form></body></html>";
iframe_doc.open();
iframe_doc.write(iframe_html);
$(iframe_doc).find('form').submit();
}
像这样使用这个;-
$('#someid').on('click', function() {
ajax_download('/download.action', {'para1': 1, 'para2': 2});
});
参数被作为适当的post params发送，就像来自一个输入，而不是像前面的例子一样作为一个json编码的字符串。
注意:要警惕在这些表单上可能出现的变量注入。可能有一种更安全的方式来编码这些变量。或者考虑逃离它们。
我创建了一个小函数作为解决方案(灵感来自@JohnCulviner插件):
// creates iframe and form in it with hidden field,
// then submit form with provided data
// url - form url
// data - data to form field
// input_name - form hidden input name
function ajax_download(url, data, input_name) {
var $iframe,
iframe_doc,
iframe_html;
if (($iframe = $('#download_iframe')).length === 0) {
$iframe = $("<iframe id='download_iframe'" +
" style='display: none' src='about:blank'></iframe>"
).appendTo("body");
}
iframe_doc = $iframe[0].contentWindow || $iframe[0].contentDocument;
if (iframe_doc.document) {
iframe_doc = iframe_doc.document;
}
iframe_html = "<html><head></head><body><form method='POST' action='" +
url +"'>" +
"<input type=hidden name='" + input_name + "' value='" +
JSON.stringify(data) +"'/></form>" +
"</body></html>";
iframe_doc.open();
iframe_doc.write(iframe_html);
$(iframe_doc).find('form').submit();
}
演示点击事件:
$('#someid').on('click', function() {
ajax_download('/download.action', {'para1': 1, 'para2': 2}, 'dataname');
});
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();
}
}
}
如果服务器在响应中写入文件(包括cookie)
你使用它们来确定文件下载是否开始)，简单地创建一个带有值的表单并提交它:
function ajaxPostDownload(url, data) {
var $form;
if (($form = $('#download_form')).length === 0) {
$form = $("<form id='download_form'" + " style='display: none; width: 1px; height: 1px; position: absolute; top: -10000px' method='POST' action='" + url + "'></form>");
$form.appendTo("body");
}
//Clear the form fields
$form.html("");
//Create new form fields
Object.keys(data).forEach(function (key) {
$form.append("<input type='hidden' name='" + key + "' value='" + data[key] + "'>");
});
//Submit the form post
$form.submit();
}
用法:
ajaxPostDownload('/fileController/ExportFile', {
DownloadToken: 'newDownloadToken',
Name: $txtName.val(),
Type: $txtType.val()
});
控制器方法:
[HttpPost]
public FileResult ExportFile(string DownloadToken, string Name, string Type)
{
//Set DownloadToken Cookie.
Response.SetCookie(new HttpCookie("downloadToken", DownloadToken)
{
Expires = DateTime.UtcNow.AddDays(1),
Secure = false
});
using (var output = new MemoryStream())
{
//get File
return File(output.ToArray(), "application/vnd.ms-excel", "NewFile.xls");
}
}
还有另一种解决方案下载ajax网页。但我指的是必须首先处理然后下载的页面。
首先，您需要将页面处理与结果下载分离。
1) ajax调用中只进行页面计算。
$.post("CalculusPage.php", { calculusFunction: true, ID: 29, data1: "a", data2: "b" },
function(data, status)
{
if (status == "success")
{
/* 2) In the answer the page that uses the previous calculations is downloaded. For example, this can be a page that prints the results of a table calculated in the ajax call. */
window.location.href = DownloadPage.php+"?ID="+29;
}
}
);
// For example: in the CalculusPage.php
if ( !empty($_POST["calculusFunction"]) )
{
$ID = $_POST["ID"];
$query = "INSERT INTO ExamplePage (data1, data2) VALUES ('".$_POST["data1"]."', '".$_POST["data2"]."') WHERE id = ".$ID;
...
}
// For example: in the DownloadPage.php
$ID = $_GET["ID"];
$sede = "SELECT * FROM ExamplePage WHERE id = ".$ID;
...
$filename="Export_Data.xls";
header("Content-Type: application/vnd.ms-excel");
header("Content-Disposition: inline; filename=$filename");
...
我希望这个解决方案对很多人都有用，就像对我一样。
