How to retrieve the value of a variable in a jsp page to another

Question

I have a variable declared in one jsp page. This variable is an array. How can I retrieve this array in the next jsp page. The code is likely to be:

<% 
    String[] a=new String[10];
    int i=0;
    while(resultSet.next())//here I'd retrieved the values from the Database
    {
        a[i]=resultSet.getString(1);
        i++;
    }
%>

now i have to retrieve this array a on the next page.

Answer 1

Put it in the session, which is an object shared among all pages and servlets of the web application:

session.setAttribute("myarray", a);

And retrieve it with:

String[] bubi = (String[]) session.getAttribute("myarray");

Instead if with

next page

you mean the page that will be included in current page some lines after, you could also use request attributes (not parameters!), setting:

request.setAttribute("myarray", a);

and getting:

String[] bubi = (String[]) request.getAttribute("myarray");

Answer 2

each jsp file live for itself. You have two options: - You use an object class, that can store that in the current session - You store the array in thehead of the request with rqeuest.setAttribute("myArgumentName", myArrayObject);

Answer 3

• store it in the session
• output it in a hidden field, comma-separated, submit it, and recreate the array on the next page

I prefer the 2nd approach.

But try to avoid java code in jsp pages. See here how and why