Upload files using usp

Question

I have a html form where the user browse for a file and submit the form. Then it calls a JSP page to upload the file on to the database. Pls help me to do this.

Answer 1

Not one to spoon-feed, but here's something to get you started. I don't know where I got this code from so I can't credit anyone....
The HTML form for browsing for the file:
<form action="upload.jsp" method="POST" enctype="multipart/form-data">
     <!-- enctype="multipart/form-data" -->
     <input type="file" name="theFile"/>
     <br>
     <input type="submit"/>
</form>The JSP (upload.jsp) for receiving the form:
<!-- upload.jsp -->
<%@ page import="java.io.*" %>
<%
     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;
          while (totalBytesRead < formDataLength)
               byteRead = in.read(dataBytes, totalBytesRead, formDataLength);
               totalBytesRead += byteRead;
          String file = new String(dataBytes);
          String saveFile = file.substring(file.indexOf("filename=\"") + 10);
          //out.print("FileName:" + saveFile.toString());
          saveFile = saveFile.substring(0, saveFile.indexOf("\n"));
          //out.print("FileName:" + saveFile.toString());
          saveFile = saveFile.substring(saveFile.lastIndexOf("\\") + 1,saveFile.indexOf("\""));
          //out.print("FileName:" + saveFile.toString());
          //out.print(dataBytes);
          int lastIndex = contentType.lastIndexOf("=");
          String boundary = contentType.substring(lastIndex + 1,contentType.length());
          //out.println(boundary);
          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;
          FileOutputStream fileOut = new FileOutputStream(saveFile);
          //fileOut.write(dataBytes);
          fileOut.write(dataBytes, startPos, (endPos - startPos));
          fileOut.flush();
          fileOut.close();
          out.println("File saved as " +saveFile);
%>The file should get created in your system32 directory; you can change the path to save elsewhere.
I think there are shortcomings to this code , for example, if you put other fields in the form, I don't think it'll work. But it should be good enough for a simple upload or atleast to get you started with this.