import java.io.File;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileManagement extends HttpServlet {

private static final long serialVersionUID = 1L;

public FileManagement() {

super();

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

if(ServletFileUpload.isMultipartContent(request)){

try {

List <FileItem> multiparts = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);

for(FileItem item : multiparts){

if(!item.isFormField()){

String name = new File(item.getName()).getName();

//FIXME: change path to your path

item.write( new File("path/to/save/uploaded/file" + File.separator + name));

}

}

//File uploaded successfully

request.setAttribute("message", "Success!!!");

} catch (Exception ex) {

request.setAttribute("message", "Oops: something went wrong " + ex);

}

}else{

request.setAttribute("message","No File found");

}

request.getRequestDispatcher("/result.jsp").forward(request, response);

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

response.setContentType("text/html");

PrintWriter out = response.getWriter();

//FIXME: sostituire con il nome del file da scaricare

String file = "file/to/download";

//FIXME: sostituire con il percorso del file da scaricare

String path = "path/to/your/file";

response.setContentType("APPLICATION/OCTET-STREAM");

response.setHeader("Content-Disposition", "attachment; filename=\"" + file + "\"");

FileInputStream fileInputStream = new FileInputStream(path+ file);

int i;

while ((i = fileInputStream.read()) != -1) {

out.write(i);

}

fileInputStream.close();

out.close();

}

}