JSP上传文件错误

Question

I made a JSP that is supposed to upload a file into a directory and it shows me an error when trying to connect: Here you can see my codes:

If anyone can help me i would appriciate it. package src;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import javax.servlet.RequestDispatcher;
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.FileItemFactory;
import org.apache.commons.fileupload.FileUploadBase;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FilenameUtils;


public class Controller extends HttpServlet {

/**
 * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
 * methods.
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */


String saveFile="c:\\uploaddir\\";


protected void processRequest(HttpServletRequest request,         HttpServletResponse response)
            throws ServletException, IOException
{
    String actiune="afiseaza";
    PrintWriter out=response.getWriter();
    if (request.getParameter("actiune")!=null)
    {
        actiune = request.getParameter("actiune");
    }

    if (actiune.equals("afiseaza"))
    {
        doAfiseaza(request, response);
    }

    if (actiune.equals("sterge"))
    {
        doDeleteFile(request, response);
    }

    try{
            boolean ismultipart=ServletFileUpload.isMultipartContent(request);
             if(!ismultipart)
             {

             }
             else
             {
                 FileItemFactory factory= new DiskFileItemFactory();
                 ServletFileUpload upload= new ServletFileUpload(factory);
                 List items=null;

                 try{
                     items=upload.parseRequest(request);

                 }catch(Exception e)
                 {

                 }

                 Iterator itr=items.iterator();
                 while(itr.hasNext())
                 {
                    FileItem item= (FileItem)itr.next();

                    if(item.isFormField())
                    {

                    }
                    else
                    {
                        String itemname=item.getName();
                        if((itemname==null)||itemname.equals(""))
                        {
                            continue;
                        }
                        String filename=FilenameUtils.getName(itemname);
                        File f=checkExist(filename);
                        item.write(f);

                    }


                 }

             }

        }catch(Exception e)
        {

        }
        finally{
        out.close();




            }
}
private void doDeleteFile(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
{
    String fName=URLDecoder.decode(request.getParameter("fis"));

    File f = new File("c:\\uploaddir\\"+fName);
    f.delete();

    doAfiseaza(request, response);
}

private void doAfiseaza(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
{
    String dir = "c:\\uploaddir";
    int er = 0;
    File[] lista = null;

    try
    {
        File f = new File(dir);
        lista = f.listFiles();
    }
    catch(Exception ex)
    {
        er=-1;
    }

    request.setAttribute("eroare", new Integer(er));
    request.setAttribute("lista", lista);

    RequestDispatcher rd = request.getRequestDispatcher("WEB-INF/lista.jsp");
    rd.forward(request, response);
}

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
 * Handles the HTTP <code>GET</code> method.
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    processRequest(request, response);
}

/**
 * Handles the HTTP <code>POST</code> method.
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    processRequest(request, response);
}

/**
 * Returns a short description of the servlet.
 *
 * @return a String containing servlet description
 */
@Override
public String getServletInfo() {
    return "Prima aplicatie";
}// </editor-fold>

private File checkExist(String fileName) {

    File f=new File(saveFile+"/"+fileName);

    if(f.exists())
    {
       StringBuffer sb=new StringBuffer(fileName);
       sb.insert(sb.lastIndexOf("."), "-"+new Date().getTime());
       f=new File(saveFile+"/"+sb.toString());

    }
    return f;
}

}

so now i have no errors but it doesnt upload my folder so i dont know what to do.

Answer 1

Since your original question was about JSP, here is some demonstration code.

<%@ page import="java.util.*,
             java.io.*,
             org.apache.commons.fileupload.*,
             org.apache.commons.fileupload.servlet.*,
             org.apache.commons.fileupload.disk.*,
             org.apache.commons.fileupload.util.*"%>
<%
    boolean isMultipart = ServletFileUpload.isMultipartContent(request);
    out.print("Request content length is " + request.getContentLength() + "<br/>"); 
    if(isMultipart){
        ServletFileUpload upload = new ServletFileUpload();
        FileItemIterator iter = upload.getItemIterator(request);
        FileItemStream item = null;
        String name = "";
        InputStream stream = null;
        while (iter.hasNext()){
            item = iter.next();
            name = item.getFieldName();
            stream = item.openStream();
            if(item.isFormField()){out.println("Form field " + name + " with value " 
                                           + Streams.asString(stream) + "<br/>");}
                else {
                    name = item.getName();
                    if(name != null && !"".equals(name)){
                        String fileName = new File(item.getName()).getName();
                        out.println("Client file " + item.getName() + " <br/>with file name "
                                                    + fileName + " uploaded.<br/>");

                        File file = new File("C:/uploaddir/" + fileName);
                        FileOutputStream fos = new FileOutputStream(file);
                        long fileSize = Streams.copy(stream, fos, true);
                        out.print(fileName 
                            + " was uploaded to the fileUploads folder. Size was " +
                                   fileSize + "<br/>");
                      }
                   }
        }
    } else out.print("Wrong request type!");
%> 

call that JSP with

<html><body>
         <form enctype="multipart/form-data" action="fileUpload3.jsp" method="post">
                <input type='file' name='file1'/><br/>
                <input type='file' name='file2'/><br/>
                <input type='file' name='file3'/><br/>
                Type message:<input type="text" name="message" /><br/>
                <input Type='submit' value='Submit'/>
         </form>
 </body></html>   

Put both files in your web app's root folder.