Help in JSP to servlet upload

You have to override the method doPost(HttpServletRequest request, HttpServletResponse response) in your servlet

jsut try this

<servlet-mapping>

      [b]<http-method>POST</http-method>[/b]

</servlet-mapping>

Your servlet can implement two methods:

doGet
doPost

Hi,

Thanks for the prompt reply. But by overriding it does not work at all. What I am trying to do here is to upload the file.

This seems to be another problem. You must override doPost() method because the HttpServlet is an abstract class and does not provide implementation for it.

I did the overriding and I couldn't compile at all.

can you post the code here?

public class upLoadServlet 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
     */
    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException, FileUploadException, UploadException {
      PrintWriter out = response.getWriter();
      MultipartFormDataRequest multiPartRequest =
                  new MultipartFormDataRequest(request);

      Hashtable files = multiPartRequest.getFiles();

      UploadFile userFile = (UploadFile)files.get("csvUpload");

      CSVReader reader = new CSVReader(
          new InputStreamReader(userFile.getInpuStream()));

      String[] columns;
      while ((columns = reader.readNext()) != null) {
        out.println("<tr><td>" + columns[0] + "</td>");
        out.println("<td>" + columns[1] + "</td></tr>");
      }
      reader.close();
    }
}

Your code does not comply with overriding rules. You cannot throw other checked exceptions than ServletException, IOException or subclasses of them.

I have change it to

public class upLoadServlet 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
     */
   
    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        try {
            PrintWriter out = response.getWriter();
            MultipartFormDataRequest multiPartRequest = new MultipartFormDataRequest(request);
            Hashtable files = multiPartRequest.getFiles();
            UploadFile userFile = (UploadFile) files.get("csvUpload");
            CSVReader reader = new CSVReader(new InputStreamReader(userFile.getInpuStream()));
            String[] columns;
            while ((columns = reader.readNext()) != null) {
                out.println("<tr><td>" + columns[0] + "</td>");
                out.println("<td>" + columns[1] + "</td></tr>");
            }
            reader.close();
        } catch (UploadException ex) {
            Logger.getLogger(upLoadServlet.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

but now i'm getting
java.lang.ArrayIndexOutOfBoundsException: 1
      love.controller.upLoadServlet.doPost(upLoadServlet.java:53)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)

btw, is there any place where they have tutorial on how to upload files which is similar to this or the use of upload bean?

Have a look at this:

http://www.javazoom.net/jzservlets/uploadbean/documentation/installation.html

It seems the "columns" array does not contain the expected number of elements. You can test the value returned by the call reader.readNext()

Hi,

It is reading the csv file now but it is not storing anywhere. Care to help me look at the codes and see where can I implement the path for storing the file?

ok. I suppose the reader.readNext() returns the next line from csv file. If so, you have to use split() method to get the line tokenized and stored into the columns array

I mean uploading the csv file to like /WEB-INF/data instead of just reading it like now.

Sorry for the confusion.

I understand. I would create another method to take care of further processing of the file (in our case saving to disk). This method could be called after the reading ends (after reader.close()) and can take as argument an array of bytes (userFile.getData()):

private void persist(byte[] fileContent) throws IOException {
      // open a new file with the desired name and path
      // write the fileContent
      // close the file
}