QuestionAsk Questions?
Pratik Prajapati
hi! i am developing web app of online exam system. I want to retrive question one by one as the user clicks "next/privious" button.I tried to get questions in arraylist in servlet and than set that arraylist as request attribute and than i wrote EL for that attribute on jsp page.But somehow i dont get any value in output, it gives nothing.What can be the problem.I dont want to use scriptlets.Pls help me to get this solved.
jsp:
<%--
Document : exam
Created on : 26 Feb, 2012, 9:20:08 AM
Author : Pratik
--%>
<%@page import="java.sql.ResultSet"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%@page import="dbconnection.Database" %>
<%! int i=1;%>
<form method="post" action=" ">
question is:${questionList[i]}
<tr><td><%=i%></td><td>${questionList[i]}</td>
<td><input type="radio" value=${Ans1["i"]} name="radio<%=i%>"${Ans1["i"]}</td>
<td><input type="radio" value=${Ans2["i"]} name="radio<%=i%>"${Ans2["i"]}</td>
<td><input type="radio" value=${Ans3["i"]} name="radio<%=i%>"${Ans3["i"]}</td>
<td><input type="radio" value=${Ans4["i"]} name="radio<%=i%>"${Ans4["i"]}</td>
</tr>
<%
i++;
//}
%>
<tr><td><input type="submit" value="Next"></td></tr>
</table>
</form>
</body>
</html>
Servlet Code:
package retrive;
import dbconnection.Database;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class retrive_que extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
Database db = (Database) getServletContext().getAttribute("db");
ResultSet rs=null;
ArrayList questionList=new ArrayList();
ArrayList Ans1=new ArrayList();
ArrayList Ans2=new ArrayList();
ArrayList Ans3=new ArrayList();
ArrayList Ans4=new ArrayList();
String fetchque="select * from new_question order by que_no";
rs=db.runSql1(fetchque);
while(rs.next())
{
questionList.add(rs.getString(2));
Ans1.add(rs.getString(4));
Ans2.add(rs.getString(5));
Ans3.add(rs.getString(6));
Ans4.add(rs.getString(7));
}
request.setAttribute("questionList",questionList);
request.setAttribute("Ans1",Ans1);
request.setAttribute("Ans2",Ans2);
request.setAttribute("Ans3",Ans3);
request.setAttribute("Ans4",Ans4);
}
catch(SQLException e) {
out.close();
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
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