Question

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How to upload files to server using JSP/Servlet?

I wrote this code in jsp to send a file to a Servlet:

<input type="file" name="inputFoto" id="inputFoto"/>

and my Servlet is:

{...
File fotoImg = (File) request.getAttribute("inputFoto");
byte[] foto = convertiInArrayByte(fotoImg);
..}

It does not work. How can I get a file in a Servlet from a JSP?
Can someone help me? Maybe there are some problems with the path of the file (on my pc)!?!?

Answer 1

file type of inputs are not simple attributes, they are sent in separate chunk of the request. Therefore you must have at least 2 parts in your HTTP request.

So, you must use Multipart Form Data processing to parse the file. There are a number of examples here, for example:

• Convenient way to parse incoming multipart/form-data parameters in a Servlet
• Java library for reading multipart/form-data http body containing multiple files

Most commonly the Apache Commons Fileupload http://commons.apache.org/fileupload is used for this.