How to fetch Data in ArrayList using ModelDriven

Question

Following are my POJO, Action, and JSP page.

For single instance of Expense I am getting proper input.

I would like to use ModelDriven to fetch multiple instance of Expense from JSP page.

For that I have created multiple <div class="Expense">...</div>, but I dont know what changes should I made in Action class.

How to achieve this?

Pojo Class:

public class Expense  implements java.io.Serializable {
     private Long id;
     private Client client;
     private String param;
     private BigDecimal value;
     private Date dt;
     private Date adddate;
     //getter and setter
}

Action Class:

public class ExpenxeAction extends ActionSupport implements ModelDriven<Expense> {

    Expense e = new Expense();
    ExpenseDAO dao = new ExpenseDAO();
    private LoginCheck lc = null;
    private List<Expense> expenseList = new ArrayList<Expense>();

    public String insertExpense() {
        dao.insert(e);
        return SUCCESS;
    }
   @Override
     public Expense getModel() {
    return e;
  }
}

JSP page:

 <div class="Expense">
    <label>Expense Type</label>
      <input type="text" name="param"  id="param"/>
     <label>Amount</label>
      <input type="text" name="value" class="form-control" id="value"/>
     <label>Date</label>
     <input type="text" name="dt" class="form-control"  id="dt"/>
   </div>

possible duplicate of [Struts 2: updating a list of objects from a form with model driven architecture](http://stackoverflow.com/questions/13028113/struts-2-updating-a-list-of-objects-from-a-form-with-model-driven-architecture) — Mandar Pandit, Jun 14 '14 at 04:57
@AleksandrM I find It easy to initialize object. Is there any other way to do so. — xrcwrn, Jun 17 '14 at 10:28
S2 will initialize object for you on submit. You don't need to do it yourself. — Aleksandr M, Jun 17 '14 at 10:34
What do you mean *reuse POJO class*? You can *reuse* it w/o modeldriven. — Aleksandr M, Jun 18 '14 at 09:48
What exactly? BTW use @xrcwrn to mention somebody. W/o it person will not be notified. — Aleksandr M, Jun 18 '14 at 10:39
Ok Without ModelDriven I will create Object for Pojo and then I will use pojo class in My action Is it correct way Without using ModelDriven — xrcwrn, Jun 18 '14 at 10:46

score 0 · Answer 1 · answered Jun 14 '14 at 19:03

0

You should create a getter for expenseList

public List<Expense> getExpenseList() {
  return expenseList;
}

in the JSP use indexed property names

<s:iterator value="expenseList" status="stat">
   <div class="Expense">
     <label>Expense Type</label>
     <s:textfield name="expenseList[%{#stat.index}].param"  id="param"/>
     <label>Amount</label>
     <s:textfield name="expenseList[%{#stat.index}].value" class="form-control" id="value"/>
     <label>Date</label>
     <s:textfield name="expenseList[%{#stat.index}].dt" class="form-control"  id="dt"/>
   </div>
</s:iterator>

answered Jun 14 '14 at 19:03

Roman C

49,761
33
66
176

If I am adding `` at Add.jsp page it is not showing any content between `` – xrcwrn Jun 16 '14 at 05:08
Use `theme="simple"` on the form tag or globally. – Roman C Jun 16 '14 at 07:27

singhpradeep · Answer 2 · 2015-09-17T10:02:49.423

To fetch array list of Expense objects in action class you need to make the following changes to your code.

First you have to change ModelDriven<Expense> to ModelDriven<List<Expense>> and remove Expense e = new Expense();, if you wish. So, finally your action class should look like this.

public class ExpenxeAction extends ActionSupport implements ModelDriven<List<Expense>>, Preparable {
    ExpenseDAO dao = new ExpenseDAO();
    private LoginCheck lc = null;
    private List<Expense> expenseList = new ArrayList<Expense>();

    public String insertExpense() {
        for (Expense e : expenseList) {     //loop to iterate over each elements
            dao.insert(e);
        }
        return SUCCESS;
    }
    public List<Expense> getExpenseList() {
        return expenseList;
    }

    public void setExpenseList(List<Expense> expenseList) {
        this.expenseList = expenseList;
    }   

   @Override
    public void prepare() throws Exception {
        expenseList = new ArrayList<Expense>(); 
    }

    @Override
    public List<Expense> getModel() {
        return expenseList;
    }
}

Now, you have to make changes to your jsp page.

<div class="Expense">
    <label>Expense Type</label>
    <input type="text" name="model[0].param"  id="param"/>
    <label>Amount</label>
    <input type="text" name="model[0].value" class="form-control" id="value"/>
    <label>Date</label>
    <input type="text" name="model[0].dt" class="form-control"  id="dt"/>

    <label>Expense Type</label>
    <input type="text" name="model[1].param"  id="param"/>
    <label>Amount</label>
    <input type="text" name="model[1].value" class="form-control" id="value"/>
    <label>Date</label>
    <input type="text" name="model[1].dt" class="form-control"  id="dt"/>

    <label>Expense Type</label>
    <input type="text" name="model[2].param"  id="param"/>
    <label>Amount</label>
    <input type="text" name="model[2].value" class="form-control" id="value"/>
    <label>Date</label>
    <input type="text" name="model[2].dt" class="form-control"  id="dt"/>
</div>

You will notice that in the jsp code we have mentioned

model[index].<pojo_member_variable_name> instead of specifying of lstExp[index].<pojo_member_variable_name>

This is because now we want struts2 to set the values directly into these member variables. So we have mentioned model[index].<pojo__member_variable_name> so that struts2 should automatically set the value into the list. Here in the above code we are creating list of 3 Expense Object. If you need to insert more values then just increment the index and set the values and remaining will be done by struts2 for you.

How to fetch Data in ArrayList using ModelDriven

2 Answers2