Searching the Student Objects stored in the Datastore by their Name

Persistents of Student objects are stored in the datastore. One of their properties is their name. The following is the Java Servlet that searches the objects by their name which match the token and returns them to the JSP Page.




import java.io.IOException;
import java.util.ArrayList;
import java.util.List;


import javax.jdo.PersistenceManager;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.*;




@SuppressWarnings("serial")
public class NameSearch extends HttpServlet {
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws IOException {

String token = req.getParameter("search");
PersistenceManager pm=PMF.get().getPersistenceManager();
String query= "select from " + Student.class.getName();
List students= (List) pm.newQuery(query).execute();
ArrayList results = new ArrayList();
for (Student a:students)
{
// Checking whether token appears in the name whether lower or upper
if (a!=null && token!=null)
if(a.getName().toLowerCase().indexOf(token.toLowerCase()) != -1)
{
// Adding the reference to the object into the ArrayList
System.out.println(a.getName());
results.add(a);
}
}
req.setAttribute("result", results);
//Sending the results data via RequestDispatcher to your JSP Page.
                RequestDispatcher r=req.getRequestDispatcher("SearchAS.jsp");
try 
{
r.forward(req, resp);
} catch (ServletException e) 
{
e.printStackTrace();
}



}
}