Convert a List to String to populate webpage in JSP

I have DAO bean rows retrieved in a List. In my JSP I am accessing the List to iterate thru to populate my page. My JSP can't access the List because it says it must be a String when I execute a request.getParameter. How I convert this to String eventually populate my page?

public List getAccessRequest()
{
    List accessRequesttList = new ArrayList());  // parse List to string
    //AccessRequest accessrequest = null;
    AccessRequest accessRequest = new AccessRequest());

    try
    {
        System.out.println("Try statement begins AccessRequestDAO");
        PreparedStatement accrqststmt = super.getConnection().prepareStatement(AccRqstSqlStmt);

        ResultSet resultSet = accrqststmt.executeQuery();

        while (resultSet.next())
        {
            // Creating an instant of job follows
            accessRequest = new Accessrequest();

            accessRequest.setJOB_NAME(resultSet.getString("job_name"));
            accessRequest.setRequest_ts(resultSet.getTime("request_ts"));
            accessRequestList.add(accessRequest);
            Iterator iterator = accessRequestList.iterator();

            while (iterator.hasNext())
            {
                accessRequest = (Accessrequest) iterator.next();
            }
        }
        return (accessRequestList);

My JSP look like below:

        <%
            List jobList = request.getParameter("acccessrequests"); // parse List to String

            Iterator iterator = jobList.iterator();
            while (iterator.hasNext())
            {
                accessRequest = (AccessRequest) iterator.next());
        %>
                <tr>
                <td><input type="checkbox" name="<%accessRequest.getApproval_ind(); %>"></td>
        开发者_StackOverflow中文版        <td><input type="text" id="jobname' name="accessRequests" value="job_name"></td>

---

HttpServletRequest#getParameter() returns a String, not a List. So the compiler is right.

I am not sure how you have ever set the List as a request parameter, there's no such method like HttpServletRequest#setParameter(). So you're probably misinterpreting something. The normal approach is to set the list as request attribute by HttpServletRequest#setAttribute() and access it in JSP by EL (expression language) like as ${attributeName}. You also normally iterate over the list using JSTL <c:forEach> tag.

Assuming that you've set the list in the request scope using a Servlet like follows...

request.setAttribute("list", list);

...here's a kickoff example how to iterate over the list:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
...
<table>
    <c:forEach items="${list}" var="item">
        <tr>
            <td>${item.property1}</td>
            <td>${item.property2}</td>
            <td>${item.property3}</td>
        </tr>
    </c:forEach>
</table>

---

Alhamdulillah, thanks God!

This help me a lot. I try to build my own java Web framework. Before reading this QA, I don't know how to access an object (say, row of table) from a JSP. I just redirect it, and leave the database code in JSP, generated by DreamWeaver. Now I know how to do it. For example, this is a BiroController, which display data from Biro Table :

 public void index() throws IOException, ServletException {
    List list=new ArrayList();
    list.add(BiroModel.create("1", "SDM"));
    list.add(BiroModel.create("2", "Keuangan"));
    request.setAttribute("list", list);        
    super.index();
}

firstly, I populate an array (subsequently, this will come from database table). and then set request attribute, then call superclass index method :

 public void index() throws IOException, ServletException {        
    RequestDispatcher rd = request.getRequestDispatcher(viewPage);
    if(rd!=null){
        rd.forward(request, response);
    }else{
       PrintWriter out = response.getWriter();
       out.print("can not dispatch to " + viewPage);
    }
    //OLD Code : response.sendRedirect(ServletUtil.getBaseUrl(request) + viewPage)
}

And, I did as you instructed in the JSP :

   <c:forEach items="${list}" var="item">
    <tr>
        <td>${item.idbiro}</td>
        <td>${item.biro}</td>
    </tr>
</c:forEach>

I use Netbeans, so I can easily pick JSTL library from the list of available library

It works charmingly.. :) tq