问题
I have a file on server which is to be downloaded using the browser download. No error is being thrown but no download window appears for the file download. Please help.
My controller code is:
@RequestMapping(value = "download", method = RequestMethod.GET)
public void downloadFile(
@ModelAttribute("path") final String path, HttpServletRequest request, HttpServletResponse response) throws Exception {
try {
logger.error("inside download get try");
ServletContext context = request.getServletContext();
File downloadFile = new File(path);
FileInputStream inputStream = new FileInputStream(downloadFile);
// get MIME type of the file
String mimeType = context.getMimeType(path);
if (mimeType == null) {
// set to binary type if MIME mapping not found
mimeType = "application/octet-stream";
}
response.setContentType(mimeType);
response.setContentLength((int) downloadFile.length());
// set headers for the response
String headerKey = "Content-Disposition";
String headerValue = String.format("attachment; filename=\"%s\"",
downloadFile.getName());
response.setHeader(headerKey, headerValue);
// get output stream of the response
OutputStream outStream = response.getOutputStream();
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = -1;
// write bytes read from the input stream into the output stream
while ((bytesRead = inputStream.read(buffer)) != -1) {
outStream.write(buffer, 0, bytesRead);
}
inputStream.close();
outStream.close();
} catch (Exception e) {
logger.error("inside download get catch");
throw new IndiciumException("Can't download the audit file");
}
My response in the firebug is like:
%PDF-1.4
%����
5 0 obj
<</Filter/FlateDecode/Length 502>>stream
x��T]o�0}�W���!��?��F�eʤ�k���4x]�����ʿ�
Nł��Ea||���^�Mt�cHi��PpBc��m��F�#
��h�?N����a~��3��=,r}�_����J8M��*u��[q(q�$U)�?��|o�:�|
�P�T�
/�Ƭ���|��m��~\_��X�*���m98 s��_��+�c��ut�77��v��ݻ��(M
�V�K���@�m�w��=�HS����(Х-�8���ն
ܮJ�g��a1������M�Ƿ��3E��&Ǧ!��$a|ܩ�вb���$цT�kSׁ8�m�>��
�0E(����|�BJb �?����f2.3�8�'�sbϰLި�O9ˎ�
endstream
endobj
7 0 obj
<</Contents 5 0 R/Type/Page/Resources<</ProcSet [/PDF /Text /ImageB /ImageC
/ImageI]/Font<</F1 1 0 R
/F2 2 0 R/F3 3 0 R/F4 4 0 R>>>>/Parent 6 0 R/MediaBox[0 0 595 842]>>
endobj
1 0 obj
<</Subtype/Type1/Type/Font/BaseFont/Times-Bold/Encoding/WinAnsiEncoding>>
endobj
2 0 obj
<</Subtype/Type1/Type/Font/BaseFont/Times-Italic/Encoding/WinAnsiEncoding>>
endobj
3 0 obj
<</Subtype/Type1/Type/Font/BaseFont/Helvetica/Encoding/WinAnsiEncoding>>
endobj
4 0 obj
<</Subtype/Type1/Type/Font/BaseFont/Times-Roman/Encoding/WinAnsiEncoding>>
endobj
6 0 obj
<</Kids[7 0 R]/Type/Pages/Count 1/ITXT(5.0.6)>>
endobj
8 0 obj
<</Type/Catalog/Pages 6 0 R>>
endobj
9 0 obj
1T3XT BVBA)>>
endobj
xref
0 10
0000000000 65535 f
0000000768 00000 n
0000000857 00000 n
trailer
<</Info 9 0 R/ID [<1b6717a8f36527b1db89d35fc22e9da5>
<c2e3cf9ec60f1d29ea766dc>]/Root 8 0 R/Size
10>>
startxref
1364
%%EOF
And the response header is:
Cache-Control
must-revalidate, post-check=0, pre-check=0
Content-Disposition
attachment; filename = exportpdf1432033492.pdf
Content-Type
application/pdf
Date
Tue, 19 May 2015 11:04:52 GMT
Expires
0
Pragma
no-cache
Server
Apache-Coyote/1.1
Transfer-Encoding
chunked
X-Frame-Options
DENY
X-XSS-Protection
1; mode=block
x-content-type-options
nosniff
回答1:
From the top of my head:
It seems your code is writing properly to response's output stream so maybe you just need to call flush() on it when your done writing. I was in a similar situation some time ago.
来源：https://stackoverflow.com/questions/30302049/browser-file-download-not-working-for-a-file-stored-on-server