Uploading images with jsp-PLEASE HELP

Hi
I would like to allow users to upload images(photos) from the website im doing.
i was gonna use perl which seems quite easy. Since everything else i used was jsp i thought i might try to do uploader in jsp (though its seems more difficult)
id like to limit :
the maximum file size to be uploaded ,
the maximum width/height of the image file
the list of the acceptable mime-types (Content-Types) -jpg, gif
Any suggestions how to go about it PLEASE- ie. what packages, classes do i need- mimeparser, BufferedImage, FileFilter? cos im bit lost which classes to use.
THANKS LOTS
sabcarina

This is the jsp File which helps me to upload the file
But for this Jakarta Commons fileupload is needed which is normally provided with Tomcat 5.5
The code is
<%@ page contentType="text/html;charset=windows-1252"%>
<%@ page import="org.apache.commons.fileupload.DiskFileUpload"%>
<%@ page import="org.apache.commons.fileupload.FileItem"%>
<%@ page import="java.util.List"%>
<%@ page import="java.util.Iterator"%>
<%@ page import="java.util.*"%>
<%@ page import="java.io.File"%>
<%@ page import="com.common.*"%>

<%
     DerivedLastNoEntity objLastNoEntity=new DerivedLastNoEntity();
     DerivedLastNoObject objLastNo=(DerivedLastNoObject)objLastNoEntity.getData(new DerivedLastNoObject(10)).get(0);
     int lastNo=objLastNo.getLastNo();
     String forwardString=null;
     StringBuffer parameters=new StringBuffer();
        DiskFileUpload fu = new DiskFileUpload();
        // If file size exceeds, a FileUploadException will be thrown
        fu.setSizeMax(1000000);
        List fileItems = fu.parseRequest(request);
        Iterator itr = fileItems.iterator();
        while(itr.hasNext()) {
          FileItem fi = (FileItem)itr.next();
          //Check if not form field so as to only handle the file inputs
          //else condition handles the submit button input
          if(!fi.isFormField()) {
          String fileName=fi.getName();
          if(fileName.length()>0)
               fileName=(++lastNo)+fileName.substring(fileName.lastIndexOf("."));
               File fNew= new File(application.getRealPath("/"), fileName);
               parameters.append("&fileName=/struts-blank/"+fileName);
               fi.write(fNew);
     else
          if(fi.getFieldName().equals("forwardString"))
               forwardString=fi.getString();
          else
               parameters.append("&"+fi.getFieldName()+"="+fi.getString());
     objLastNo.setLastNo(lastNo);
     objLastNoEntity.edit(objLastNo);
     System.out.println("before "+forwardString);
     if(parameters.length()>0)
          if(forwardString.indexOf("?")<0)
               forwardString=forwardString.concat(parameters.toString().replaceFirst("&","?"));
          else
               forwardString=forwardString.concat(parameters.toString());
     System.out.println("after "+forwardString);
     response.sendRedirect(forwardString);
%>
Bye for now
CSJakharia

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