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Editorial Team
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Asked: 2026-06-11T19:49:13+00:00

I have a JSP page and a servlet.The JSP has two input, one being

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I have a JSP page and a servlet.The JSP has two input, one being the File and the other is a text input.When user clicks on the SUBMIT button the Form action points to Servlet`s do Post().In Do Post() I have didvided the code into two part.The one part retrives the text input and File name from Jsp page and the other converts the file into bytes.

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
                                                                                    IOException {
    response.setContentType(CONTENT_TYPE);
    PrintWriter out = response.getWriter();

    //This is 1st part
    //For Converting the File into Stream of Bytes
    String contentType = request.getContentType();
    //System.out.println("Content type is :: " +contentType);

    if ((contentType != null) && (contentType.indexOf("multipart/form-data") >= 0)) {
        DataInputStream in = new DataInputStream(request.getInputStream());
        int formDataLength = request.getContentLength();
        byte dataBytes[] = new byte[formDataLength];
        int byteRead = 0;
        int totalBytesRead = 0;
        int k = -1;
        while (totalBytesRead < formDataLength) {
            byteRead = in.read(dataBytes, totalBytesRead, formDataLength);

            totalBytesRead += byteRead;
            //System.out.println(dataBytes[++k]);

        }
        for (int i = 0; i < formDataLength; i++) {
            System.out.print((char)dataBytes[i]);

        }

        System.out.println("Converted");
        out.println("<HTML>");
        out.println("<HEAD>");
        out.println("</HEAD>");
        out.println("<BODY>");
        out.println("<H1>UPLOADED FILE</H1>");
        out.println("<BODY>");
        out.println("</HTML>");
    } else
        System.out.println("asa");


    //This is the 2nd part
    // Create a new file upload handler
    DiskFileUpload upload = new DiskFileUpload();

    // parse request
    List items = null;

    // get uploaded file
    try {
        items = upload.parseRequest(request);
    } catch (FileUploadException e) {
    }
    FileItem file = (FileItem)items.GET(1);
    String DocTitle = file.getName();

    int len = DocTitle.length(), pos = 0, j = 2;
    for (int i = 0; i < len; i++) {

        if (DocTitle.charAt(i) == 46) {
            pos = i;

        }

    }

    String s = DocTitle.substring(pos + 1, len);
    System.out.println("TheContent Type is: " + s);

    // get taget filename
    FileItem name = (FileItem)items.get(1);
    String fileName = name.getString();
    System.out.println("Filename: " + fileName + "." + s);

}

The problem is if i only run only the 1st part or 2nd part the code works but together they dont seem to work.If both are put together then the 1st part get executed and for 2nd part it throws

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(ArrayList.java:547)

Please help me to solve the above

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1 Answer

  1. Editorial Team

    Your concrete mistake is that you’re attempting to read the HTTP request body twice. The first time using request.getInputStream() with apparently the sole purpose to print it to the stdout (perhaps a careless debug attempt?). The second time using Apache Commons FileUpload. However, it would retrieve a completely empty request body by request.getInputStream(), because you’ve already consumed it beforehand! The client ain’t going to re-send the file for a second time so that you can read it for a second time (using Apache Commons FileUpload).

    Remove that 1st block altogether and it should work.

    Oh, please stop reading roseindia.net. That site only shows misleading code examples and teaches extremely bad practices which confuses starters altogether.

    See also:

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