Multiple File upload using single servlet request

java html file http multipart

29,216

Solution 1

In you HTML, you can do the following :

<input accept="image/jpeg,image/gif,image/png" type="file" name="upload[]" multiple/>

adding multiple to the end of your input grants you what you want.

Solution 2

Hope This Helps...

//JSP File

<html>
<head><title>Upload page</title></head></p> <p><body>
<form action="upload_file" method="post" enctype="multipart/form-data" name="form1" id="form1">
<center>
 Specify file: <input name="file" type="file" id="file">
 Specify file: <input name="file" type="file" id="file">
 Specify file:<input name="file" type="file" id="file">
 <input type="submit" name="Submit" value="Submit files"/>
<center>
</form>
</body>
</html>


//Servlet Page

import java.util.List;
import java.util.Iterator;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.*;

boolean isMultipart = ServletFileUpload.isMultipartContent(request);
   if (!isMultipart) {
   }
   else{
      FileItemFactory factory = new DiskFileItemFactory();
      ServletFileUpload upload = new ServletFileUpload(factory);
      List items = null;
      try {
          items = upload.parseRequest(request);
          } catch (FileUploadException e) {
               e.printStackTrace();
          }
      Iterator itr = items.iterator();
      while (itr.hasNext()) {
           FileItem item = (FileItem) itr.next();
           if (item.isFormField()) {
           } else {
           try {
              String itemName = item.getName();
              File savedFile = new File(config.getServletContext().getRealPath("/")+"uploadedFiles/"+itemName);
              item.write(savedFile);
              out.println("<tr><td><b>Your file has been saved at the loaction:</b></td></tr><tr><td><b>"+config.getServletContext().getRealPath("/")+"uploadedFiles"+"\\"+itemName+"</td></tr>");
              } catch (Exception e) {
                   e.printStackTrace();
              }
       }
}

Solution 3

Yes, you can. Try apache fileupload library, you may refer to this question on stackoverflow: Multiple file upload in Jsp using Apache commons file upload API or this full example. Also you may take use of Spring by referencing this article.

29,216

Author by

Rohit Rehan

I have been working for 9 years now. so it's time to give back to the community what I have.

Updated on February 25, 2020

Comments

Rohit Rehan about 4 years

I want to offer to upload multiple files clicking upload button only once. Can I use multipart to send files? If yes, then how?

P.S.: I don't want to use flash or send one file at a time.
Rohit Rehan about 11 years

Thanks for your response but I cannot use spring I can only use servlets 2.5
Rohit Rehan about 11 years

Thanks for your response but I don't want to use external libraries or API's
Sabarish about 11 years

Updated answer kindly verify it
Rohit Rehan about 11 years

No, I cannot use apache commons(or any external library), Also I have to monitor progress of ho much file has been uploaded. that I have to handle in JS :)