How to display all headers of multipart request?

[senol ozer]

Hi all!

I would like process multipart request from my servlet. For this, I use the API Apache Common FileUpload.

Here is an example of my request:

--GWqdHAxkdeIb8vSZKRRMInQ23WH77j
Content-Disposition: form-data; name="identifiant"
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 8bit
Content-ID: contentId1

Value1
--GWqdHAxkdeIb8vSZKRRMInQ23WH77j
Content-Disposition: form-data; name="sessionID"
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 8bit
Content-ID: contentId2

value2

Here is my code:

boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart) {
	// Create a factory for disk-based file items
	FileItemFactory factory = new DiskFileItemFactory();

	// Create a new file upload handler
	ServletFileUpload upload = new ServletFileUpload(factory);

	// Parse the request
	try {
		@SuppressWarnings("unchecked")
		List<FileItem> items = upload.parseRequest(request);
		
		// Process the uploaded items
		Iterator<FileItem> iter = items.iterator();
		int i = 0;					
		while (iter.hasNext()) {
			System.out.println("*************************");
			System.out.println("part : " + ++i);
			System.out.println("*************************");
			
			FileItem item = iter.next();

			System.out.println("getFieldName : " + item.getFieldName());
			System.out.println("getName : " + item.getName());
			System.out.println("getString : " + item.getString());
			System.out.println("toString : " + item.toString());

			if (item.isFormField()) {
				// processFormField(item);
			} else {
				// processUploadedFile(item);
			}
		}
	} catch (FileUploadException e) {
		e.printStackTrace();
	}
}

I can't display my "content-id" field.

Can you help me please?

[Clivant Yeo]

Hi,

Think you can achieve what you want by doing the following:

Use the getItemIterator method instead of the parseRequest method.

Use the FileItemIterator returned to iterate through the FileItemStream instances.

Use the openStream method of the FileItemStream instances to read the contents.

I didn't try it yet, but that's what I can gather by reading the API.

Hope it helps!

[senol ozer]

Thanks for your reply!

I tried your method but it display only the value of the part. For my request example, it display only

11:35:23,770 INFO  [STDOUT] *************************

11:35:23,770 INFO  [STDOUT] part : 1

11:35:23,770 INFO  [STDOUT] Value1

11:35:23,770 INFO  [STDOUT] *************************

11:35:23,770 INFO  [STDOUT] part : 2

11:35:23,770 INFO  [STDOUT] Value2

Tere is my code:

boolean isMultipart = ServletFileUpload.isMultipartContent(request);
			if (isMultipart) {
				// Create a factory for disk-based file items
				FileItemFactory factory = new DiskFileItemFactory();

				// Create a new file upload handler
				ServletFileUpload upload = new ServletFileUpload(factory);

				try {
					@SuppressWarnings("unchecked")
					FileItemIterator fileItemIterator = upload
							.getItemIterator(request);
					int i = 0;
					while (fileItemIterator.hasNext()) {
						FileItemStream fileItemStream = fileItemIterator.next();

						System.out.println("*************************");
						System.out.println("part : " + ++i);

						InputStream input = fileItemStream.openStream();

						BufferedReader buffer = new BufferedReader(
								new InputStreamReader(input));
						String ligne = null;
						while ((ligne = buffer.readLine()) != null) {
							System.out.println(ligne);
						}
					}
				} catch (FileUploadException e) {
					e.printStackTrace();
				}
			}

[Clivant Yeo]

Hey Senol,

I took a look at the api again. It seems that FileItemStream extends FileItemHeadersSupport, which means that there is a getHeaders() method available from the fileItemStream instances.

API for FileItemStream

API for FileItemHeadersSupport

I have a strong feeling that the getHeaders() method is what you are looking for.

I don't have a Java web container installed on my machine, but let me know if this works.