Passing parameter to a jsp from a servlet

Question

Hi,
I need to pass a parameter from a servlet to a jsp without using the session object. Is it possible? I've been looking for a method like response.setParameter but it doesn't exist.
Please help !!!

Answer 1

Actually, there is no setParameter method in the ServletRequetsObject. Still, you can create one. This can be usefull when you have a jsp that get its parameters from either a direct html form posting or a forward from a servlet. This can be achieved using wrappers, instead of the real request object.
It's not really tricky, it's only a little "underknown" feature.
Here is a sample code when you can fake the settings of requets parameters :
public class MyRequest extends HttpServletRequestWrapper {
   private HashMap fakedParameters;
   public MyRequest(HttpServletRequest nested) {
      super(this);
      fakedParameters=new HashMap();
    public void setParameter(String key,String value) {
        fakedParameters.put(key,value);
    public String getParameter(String name) {
       String res=fakedParameter.get(name):
       if (res==null)
           res=super.getParameter(name);
       return res;
}NB: this is a sample, you may also override other method (such as getParameterNames) for a full featuerd wrapped request.
Now, you can use your wrapped request :
MyRequest req2=new MyRequest(request);
RequestDispatcher dispatcher=request.getRequestDispatcher("/somePage.jsp");
req2.setParameter("name","yourName");
dispatcher.formard(req2,response);Hope it helps.