Get parameter when multipart request in JSP

Question

<%@page contentType=\"text/html\" pageEncoding=\"UTF-8\"%>

    
        

        

Answer 1

Since you post using multipart encoding ('multipart/form-data') the parameters are not present as you expect.

If for instance you are using commons-fileupload the parameters would be present as and are identifiable using the 'isFormField' method on the FileItem object.

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CODE

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    try {
        List<FileItem> items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);
        for (FileItem item : items) {
            if (item.isFormField()) {
                // Process regular form field (input type="text|radio|checkbox|etc", select, etc).
                String fieldname = item.getFieldName();
                String fieldvalue = item.getString();
                // ... (do your job here)
            } else {
                // Process form file field (input type="file").
                String fieldname = item.getFieldName();
                String filename = FilenameUtils.getName(item.getName());
                InputStream filecontent = item.getInputStream();
                // ... (do your job here)
            }
        }
    } catch (FileUploadException e) {
        throw new ServletException("Cannot parse multipart request.", e);
    }

    // ...
}

Answer 2

use Annotation

@MultipartConfig

for your Servlet