getting dropdown values using apache commons in servlet

i want to get dropdown values in my program in order to merge the string to my file path so that the path will change dynamically according to user input.iam new to apache commoms,before that i was using o'reilly api.

here is my code :

 @Override
public void doPost(HttpServletRequest request, 
       HttpServletResponse response)
      throws ServletException, java.io.IOException 
{
   //FileItem f1;
String d1= request.getParameter("sel1");
String d2=request.getParameter("sel2");
String d3="/home/adapco/Desktop/output";
String conc=d3+"/"+d1+"/"+d2+"/";
filePath=(new StringBuilder()).append(conc).toString();
//      filePath="/home/adapco/Desktop/output/";
isMultipart = ServletFileUpload.isMultipartContent(request);
}

i tried to debug and i am getting the wright file path but while proceeding further,the fileItems shows size=0 and and it is not entering the loop because of size0.

filePath="/home/adapco/Desktop/output/";

if i pass the upload path to the filePath it works fine.

List fileItems = upload.parseRequest(request);    
Iterator i = fileItems.iterator();
while ( i.hasNext () ) 
{
 FileItem fi = (FileItem)i.next();
 if ( !fi.isFormField () )  
 {         
    String fieldName = fi.getFieldName();
    String fileName = fi.getName();
    String contentType = fi.getContentType();
    boolean isInMemory = fi.isInMemory();
    long sizeInBytes = fi.getSize();
    if( fileName.lastIndexOf("\\") >= 0 ){
       file = new File( filePath + 
       fileName.substring( fileName.lastIndexOf("\\"))) ;
    }else{
       file = new File( filePath + 
       fileName.substring(fileName.lastIndexOf("\\")+1)) ;
    }
    fi.write( file ) ;
    out.println("Uploaded Filename: " + fileName + "<br>"+filePath);

 }

my html :

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
 <title>File Uploading Form</title>
 </head>
<body>
<h3>File Upload:</h3>
 Select a file to upload: <br />
 <form action="upload" method="post"
                enctype="multipart/form-data">
 <input type="file" name="file">
 <br />
 <select name="sel1"> 
 <option label ="1">aerospace</option>
 <option label ="2">automotive</option>
 </select>
 <select name="sel2">
 <option label="1">internal</option>
 <option label="2">demo</option>
 </select>
 <input type="submit" value="Upload File" />
 </form>
 </body>
 </html>

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