Main.java

package com.michaelbelyakov1967.servlet;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;

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

import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;

public abstract class Uploader extends HttpServlet {

 public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException{
  PrintWriter out = response.getWriter();
  boolean isMultipart = ServletFileUpload.isMultipartContent(request);
  ServletFileUpload upload = new ServletFileUpload();
  try{
   FileItemIterator iter = upload.getItemIterator(request);
   while (iter.hasNext()){
    FileItemStream item = iter.next();
    String name = item.getName();
    InputStream stream = item.openStream();
    if(item.isFormField())processParameter(name, Streams.asString(stream));
    else processInputStream(name, stream);
//    out.print("OK");
    response.sendRedirect(request.getContextPath() + "success.html");
   }
  }
  catch(FileUploadException ex){
   response.sendRedirect(request.getContextPath() + "failure.html");
//	  out.print("Error");
   throw new ServletException();
  } 
 }

 protected abstract void processInputStream(String name, InputStream is) throws IOException;
 protected abstract void processParameter(String name, String value);
}