How to pass an ArrayList from Java class to jsp

Question

Attempting to send an ArrayList from java class to servlet. The returned values of ResultSet is passed on to a model object and this object is added to an ArrayList. However I need retrieve this ArrayList in vieitems.jsp.

DBController.java

 public void getAvailableItems(String sqlst) throws Exception {
     Connection connection = getConnection();
     Statement stm = connection.createStatement();
     ResultSet rst = stm.executeQuery(sqlst);

     ArrayList<Item> avitems = new ArrayList<Item>();
     while (rst.next()) {
         String itemname = rst.getString("ItemName");
         String description = rst.getString("Description");
         int qtyonhand = rst.getInt("QtyOnHand");
         int reorderlevel = rst.getInt("ReorderLevel");
         double unitprice = rst.getDouble("unitprice");
         Item item = new Item(itemname, description, qtyonhand, reorderlevel, unitprice);
         avitems.add(item);
     }
    //i need to send avitems to ViewItems.jsp
 }

ViewItems.jsp

 <form>
     <Table border="1">
         <tbody>
             <tr> <td>Item Code</td><td>Item Name</td><td>Description</td><td> Qty On Hand</td><td>Reorder Level</td></tr>
             //here i need to set the values of arraylist avitems               
         </tbody>
     </Table>
 </form>

Do you know anything about [`JSP`](http://beginnersbook.com/category/jsp-tutorial/)? — PM 77-1, Sep 22 '14 at 23:10
possible duplicate of [Pass variables from servlet to jsp](http://stackoverflow.com/questions/3608891/pass-variables-from-servlet-to-jsp) — PM 77-1, Sep 22 '14 at 23:16
@PM77-1 here i'm trying to pass an arraylist from java class to jsp,not from servlet to jsp. — Kumaranath Fernado, Sep 22 '14 at 23:33
And what your POJO is a part of? Plus you may want to answer my 1st question. It was not rhetoric. — PM 77-1, Sep 22 '14 at 23:36
My first comment has a link to a JSP Tutorial. You may want to work it through. — PM 77-1, Sep 23 '14 at 00:50
don't name your pojo class as a controller this is confusing. — Prikshit, Sep 23 '14 at 11:55

score 2 · Answer 1 · answered Sep 23 '14 at 05:44

In the servlet code, with the instruction request.setAttribute("itemList", avitems), you save your list in the request object, and use the name "itemList" for refering it.

When you arrive to your JSP, it's necessary to retrieve the list from the request, and for that you just need the request.getAttribute("itemList") method.

   //Servlet page code DBController.java
request.setAttribute("itemList", avitems); 
ServletContext context= getServletContext();
RequestDispatcher rd= context.getRequestDispatcher("/ViewItems.jsp");
rd.forward(request, response);


// Jsp Page code ViewItems.jsp
<%  
// retrieve your list from the request, with casting 
ArrayList<Item> list = (ArrayList<Item>) request.getAttribute("itemList");

// print the information about every category of the list
for(Item item : list) 
{
   // do your work
}
%>

score 1 · Answer 2 · answered Sep 23 '14 at 11:50

Make that ArrayList declaration static in DbController.java

In DbController create one method

    void static ArrayList<items> getList()
     {
            return avitems;
          }

it will return you the list in view.jsp

in view.jsp import DbController.java and add this scriplet

       <%
              ArrayList<Item> list = DbController.getList(); //it will return the list
       %>

iterate and do whatever you want to do with this list in your view.jsp i think this will help you.

How to pass an ArrayList from Java class to jsp

2 Answers2