Upload.java

package com.ebix.uploader;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class Upload extends HttpServlet {
    private static final long serialVersionUID = 1111111122222267867L;

    private File tmp;

    public void init(ServletConfig config) throws ServletException {
        tmp = new File(config.getServletContext().getRealPath("."));
    }

    // http://commons.apache.org/fileupload/using.html
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        if (ServletFileUpload.isMultipartContent(request)) {
            FileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(factory);
            try {
                FileItemIterator items = upload.getItemIterator(request);
                while (items.hasNext()) {
                    FileItemStream item = items.next();
                    if (!item.isFormField()) {
                        File folder = new File(tmp, "" + new Date().getTime());
                        folder.mkdir();
                        File file = new File(folder, item.getName());
                        file.createNewFile();
                        System.out.println("gravando em " + file);
                        InputStream in = item.openStream();
                        FileOutputStream out = new FileOutputStream(file);
                        byte b[] = new byte[2048];
                        int i = -1;
                        while ((i = in.read(b)) > -1)
                            out.write(b, 0, i);
                        out.flush();
                        out.close();
                    }
                }

            } catch (FileUploadException e) {
                throw new ServletException(e);
            }
            request.setAttribute("su", "Sucesso no upload");
        }
        request.getRequestDispatcher("/sucesso.jsp")//
                .forward(request, response);
    }

}