convert struts2 iterator into *.json file

This is iterator holding bank details.

<s:iterator value="bankDetailsList">
    <tr>
        <td><s:property value="Date"/></td>
        <td><s:property value="Description"/></td>
        <td><s:property value="Debit" /></td>
        <td><s:property value="Credit" /></td>
        <td><s:property value="Balance" /></td>
    </tr>
</s:iterator>

i want to convert this iterator into *.json. can anyone do this or help me ?. thanks in advance.