java.util.Enumeration   e   =   request.getSession().getAttributeNames(); 

while( e.hasMoreElements())   {

    String sessionName=(String)e.nextElement();

    out.println("\nsession item name="+sessionName);

    out.println("\nsession item value="+request.getSession().getAttribute(sessionName));

} 

Map map = new HashMap();

map = request.getParameterMap();

for(Iterator iter = map.entrySet().iterator();iter.hasNext();){

    Map.Entry element = (Map.Entry)iter.next();

    String strKey = element.getKey().toString();

    out.println("\nkey="+strKey);

    String[] value=(String[])element.getValue();

    if(value.length>0){

     for(int i=0;i<value.length;i++)

out.println("\nvalue"+String.valueOf(i)+"="+value[i].toString());

      }

    int a=1;

}