Read multiple files from HttpServletRequest

Question

I receive a request (HttpServletRequest req) with 2+ files. I am doing this in order to get files from request

HttpServletRequest req;

....

Map parameters = req.getParameterMap();

UploadedFile uploadedFile = (UploadedFile) parameters.get("file");

String[] serverNames = uploadedFile.getServerFileNames();
debug(serverNames.length);

However I always get only 1 file. What do I do wrong? Thanks.

[Upload file using Servlet API](http://stackoverflow.com/questions/2422468/how-to-upload-files-to-server-using-jsp-servlet). What is `UploadedFile`? Is it from JSF? — xiaofeng.li, Nov 23 '16 at 14:00
The parameter map has type `Map`, it can not hold the uploaded file. If you are using Servlet API 3.0, you can use `getPart(String)` method. If you are using an older version, you need a library to parse the input stream. — xiaofeng.li, Nov 23 '16 at 14:03
@luke Lee you are right, but the way it works, files are already uploaded on server and I only receive their file names. UploadedFile class actually contains only file name on server. — Dmytro Pastovenskyi, Nov 23 '16 at 14:17

Tim Weber · Answer 1 · 2016-11-23T14:02:32.417

0

If your parameters contains a list of files, you can use :

for (Entry entry : parameters.entrySet()) {
    if (entry.getValue() instanceof UploadedFile) {
        UploadedFile file = entry.getValue();
    }
}

edited Nov 23 '16 at 14:02

answered Nov 23 '16 at 13:57

Tim Weber

858
4
14

in my case all files are in 1 place. I only have "File" parameter in request with multiple flies. – Dmytro Pastovenskyi Nov 23 '16 at 14:22
So you can cast your parameters like this : parameters = (Map) parameters.get("file"); and try the solution i suggest – Tim Weber Nov 23 '16 at 14:32

score 0 · Answer 2 · edited May 23 '17 at 11:59

0

You use multipart form data and should correctly handle all parts or request. Excample from How to upload files to server using JSP/Servlet?

List<FileItem> items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);
for (FileItem item : items) {
    //handling...
}

edited May 23 '17 at 11:59

Community

1
1

answered Nov 23 '16 at 14:50

Vitalii Pro

313
2
17

Read multiple files from HttpServletRequest

2 Answers2