Java EE6 / @MultipartConfig

The Multipart annotation, introduced by EE 6, is very helpful to create a multipart upload.

First you need to create an upload form with method „post“ and enctype „multipart“.

fileupload.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Fileuploads</title>
</head>
<body>
	  
	<form action="/OCEJWCD/fileupload" method="POST" enctype="multipart/form-data">
		    <input type="file" name="name">
		     <input type="submit"
			value="POST">   
	</form>

</body>
</html>

Next you can easily annotate your request accecpting servlet class with @WebServlet and @MultipartConfig. The MultipartConfig tells the servlet that there will be an incoming multipart upload and you’ll be able to access these parts via the HttServletRequest object.

FileUpload.java

package de.joerndettmer;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

@WebServlet(urlPatterns = "/fileupload", name = "fileuploadServlet")
@MultipartConfig
public class FileUpload extends HttpServlet {

	private static final long serialVersionUID = 2575996974446997345L;

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {

		Collection<Part> filePart = req.getParts();
		FileOutputStream fos = new FileOutputStream(new File("fileupload.txt"));

		for (Part part : filePart) {
			int read = 0;
			InputStream filecontent = part.getInputStream();
			final byte[] bytes = new byte[1024];
			while ((read = filecontent.read(bytes)) != -1) {
				fos.write(bytes, 0, read);
			}
		}

		fos.flush();
		fos.close();

	}
}

For further information see: MultipartConfig Link

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