Uploading Application in JSP.

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The request object is used to send the raw data in form of key/value pair to the server from the browser. What if, we want to send the multipart data i.e. images, files and binary data to the server. The below example will demonstrate the multiple type data send to the server.

<%@ page import="java.io.*"%>

<%

    String contentType = request.getContentType();

    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;

              while (totalBytesRead < formDataLength) {

                  byteRead = in.read(dataBytes, totalBytesRead, formDataLength);

                     totalBytesRead += byteRead;

                }

                String file = new String(dataBytes);

                String saveFile = file.substring(file.indexOf("filename=\"") + 10);

              saveFile = saveFile.substring(0, saveFile.indexOf("\n"));

              saveFile = saveFile.substring(saveFile.lastIndexOf("\\") + 1,saveFile.indexOf("\""));

                int lastIndex = contentType.lastIndexOf("=");

                String boundary = contentType.substring(lastIndex + 1,contentType.length());

                int pos;

             pos = file.indexOf("filename=\"");

             pos = file.indexOf("\n", pos) + 1;

             pos = file.indexOf("\n", pos) + 1;

             pos = file.indexOf("\n", pos) + 1;

               int boundaryLocation = file.indexOf(boundary, pos) - 4;

                int startPos = ((file.substring(0, pos)).getBytes()).length;

                int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;

                String filepath=session.getServletContext().getRealPath("/")+saveFile;

                FileOutputStream fileOut = new FileOutputStream(filepath);



            fileOut.write(dataBytes, startPos, (endPos - startPos));

            fileOut.flush();

            fileOut.close();

            out.println("File saved as " +saveFile);

    }

%>

<form method="post" ACTION="upload.jsp" name="uploadForm" ENCTYPE='multipart/form-data'>

<input type="file" name="uploadfile" />

<p>

    <input type="submit" name="Submit" value="Submit">

    <input type="reset" name="Reset" value="Reset">

    <input type="hidden" name="action" value="upload">

</p>

</form>