在我的應用程序中,json對象是在客戶端創建的。這個對象被髮布到一個HttpServlet,它根據POST數據創建一個pdf文件。如何使用Jquery從httpServlet下載文件?
該文件發回給用戶。調用succes函數,並記錄流數據。然而,我想要下載文件。
如何實現這一目標?
我的客戶機側代碼:
$(document).ready(function() {
// when the print button is clicked
$('#exportButton').click(function() {
var tableIdx = performanceDetailTableController.getTableIdx();
var allData = {
"shipTable1":{
"rows":[
{ "latitude":"12323","longitude":"213213"},
{ "latitude":"213213","longitude":"543543"}
]},
"shipTable2":{
"rows":[
{ "latitude":"12323", "longitude":"213213"},
{ "latitude":"213213","longitude":"543543"}
]}
}
var postData = JSON.stringify(allData);
$.ajax({
type : "POST",
url : 'pdfServlet',
contentType: "application/json; charset=utf-8",
data : postData,
async : false,
success : function(data) {
alert("got some data");
console.log(data);
},
});
});
});
並且servlet創建文件:
%PDF-1.4
%
4 0 obj
<<
/Producer (Apache FOP Version SVN branches/fop-0_95)
/CreationDate (D:20130725162007+02'00')
>>
endobj
5 0 obj
<<
/N 3
/Length 11 0 R
/Filter /FlateDecode
>>
stream
xwTSϽ7PhRHH.*1 J
* 我的解決方案:
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
// get the json content
StringBuffer jsonContent = getPostedContent(request);
log.info(jsonContent.toString());
// convert json to pojo's
Tables tables = getTablesFromString(jsonContent);
// create a xml stream
ByteArrayOutputStream xml = new XmlConverter().getXMLSource(tables);
// put the xml on the request
request = setXmlOnRequest(request, xml);
// create pdf data of the pdf-able xml content
ByteArrayOutputStream pdf = new PdfHandler().createPdfDataStream(request);
// response = createResponseheaders(response, request);
response.setContentType("application/pdf");
response.setContentLength(pdf.size());
response.setHeader("Content-disposition", "attachment; filename=test.pdf");
response.setCharacterEncoding("utf-8");
response.getOutputStream().write(pdf.toByteArray());
//close the streams
pdf.close();
response.getOutputStream().close();
}
日誌中的輸出中*
看到http://www.particletree.com/notebook/ajax-file-download-or-not/的指針
我創建了一個表單隱藏字段:
<button id="exportButton">export</button>
<form id="exportForm" method="post" action="pdfServlet">
<input type="hidden" value="empty" id="pdf_data" name="pdf_data" />
</form>
比我改變了我的jQuery POST數據控制器:
$('#exportButton').click(function() {
var tableIdx = performanceDetailTableController.getTableIdx();
var allData = {
"shipTable1":{
"rows":[
{ "latitude":"12323","longitude":"213213"},
{ "latitude":"213213","longitude":"543543"}
]},
"shipTable2":{
"rows":[
{ "latitude":"12323", "longitude":"213213"},
{ "latitude":"213213","longitude":"543543"}
]}
}
var postData = JSON.stringify(allData);
// put the data on the hidden form field in the export form
$('#pdf_data').val(postData);
// and submit the form
$('#exportForm').submit();
});
所以現在當我點擊導出按鈕,在表單中的隱藏字段獲得發佈的數據,並將數據發佈爲www-form編碼。
這樣servlet可以處理請求並將文件下載到客戶端。
你不能用ajax強制文件下載。 –
Ajax響應不允許下載文件。 – NINCOMPOOP