J2ME - Read Unicode File From Resource

public String readUnicodeFile(String filename) {
 StringBuffer buffer = null;
 InputStream is = null;
 InputStreamReader isr = null;
 try {
   Class c = this.getClass();
   is = c.getResourceAsStream(filename);
   if (is == null)
     throw new Exception("File Does Not Exist");

   isr = new InputStreamReader(is,"UTF8");

   buffer = new StringBuffer();
   int ch;
   while ((ch = isr.read()) > -1) {
     buffer.append((char)ch);
   }
   if (isr != null)
     isr.close();
 } catch (Exception ex) {
   System.out.println(ex);
 }
 return buffer.toString();
}

// Usage:
String content = readUnicodeFile('/resource/huypv.txt');