Java 中遍历 Session or Request

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;
}