Check for filesize before uploading the file

Hi everyone,
I�m currently thinking about a solution to the following question and would need some help:
I wanna write a small jsf-application where it�s possible to upload files from the client to a server. But I have the problem, that I want to check the filesize of the user-selected file before he starts to upload the complete file, so that I can decide dynamically if it is allowed to upload a file of that filesize . If I simply use the mulipart/form-data-request I always get the complete request and can only decide afterwards if it was too big or not. That�s not the way a wanna go.
Does anyone know of a good solution to this problem? I guess I won�t be the first one who has to handle with that kind of problem.
Many thanks
Thomas

This can only be done with a client side script. Javascript with ActiveX can do, but in the latest browsers this is disabled by security reasons.
Locally you might try:<html>
    <head>
        <script>
            function getFileSize(filePath) {
                var fileSystemObject = new ActiveXObject("Scripting.FileSystemObject");
                var file = fileSystemObject.getFile(filePath);
                var size = file.size;
                alert(size + " bytes\n" + (size / 1024) + " KB\n" + (size / 1024 / 1024) + " MB");
        </script>
    </head>
    <body>
        <form name="myForm">
            <input type="file" name="myFile">
            <input type="button" value="check size" onclick="getFileSize(document.myForm.myFile.value);">
        </form>
    </body>
</html>This works in IE only and doesn't work in FF 2.0 here.
I don't know any other solutions as such scripts are forbidden for security reasons.

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1>Upload.jsp
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<%@ page import="java.io.*"%>
<%@ taglib uri="/WEB-INF/struts-bean" prefix="bean" %>
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<tr>
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<font color="red"></font>
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<td align="right">
File Name
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</td>
</tr>
</table>
</form>
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import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;
public class UploadForm extends ActionForm
     private static final long serialVersionUID = 1L;
private FormFile theFile;
   public UploadForm(){}
   * @return Returns the theFile.
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package com.MyPack.Datamatics;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
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[help link 2|http://www.roseindia.net/struts/strutsfileupload.shtml]

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