Servlet + JSP + SQL question

Question

I have a servlet that is executing a few queries against a database. I am fowarding the results to a jsp page to display the results. I have been able to do this. My problem is when my query selects more than one field I am unsure on how to read that into an array or something like that. All the results I have done so far have had multiple results but only from one field in the database. Here is my serlvet and jsp code. If some one could tell me how to read multiple field into an array and display them on a jsp page that would be great. Thank you
Servlet
package nnet;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.security.Principal;
import java.sql.*;
import java.sql.DriverManager;
* <p>Title: NNET</p>
* <p>Description: Northland Intranet</p>
* <p>Copyright: Copyright (c) 2004</p>
* <p>Company: NMI</p>
* @author not attributable
* @version 1.0
public final class home
extends HttpServlet {
//Initialize global variables
//Initialize queries
private static final String USERQUERY =
"SELECT public.tblindividual.firstname as firstname " +
"FROM public.tblloginname " +
"INNER JOIN public.tblindividual ON (public.tblloginname.indlink = public.tblindividual.indid) " +
"WHERE LOWER(public.tblloginname.loginname) = LOWER(?)";
private static final String MAINLINKQUERY =
"SELECT public.nnetsection.name " +
"FROM public.nnetsection " +
"WHERE public.nnetsection.posted = 'true'";
private static final String ANOUNCEMENTQUERY =
"SELECT public.nnetanouncement.anouncement, to_char(nnetanouncement.postdate,'MonthDD, YY') as postdate " +
"FROM public.nnetanouncement " +
"ORDER BY public.nnetanouncement.postdate DESC";
public void init() throws ServletException {
//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
Connection con = null;
PreparedStatement stmt = null;
//Initialize Resultset objects
ResultSet namers = null;
ResultSet mainlinkrs = null;
ResultSet anouncementrs = null;
ResultSet anouncementdaters = null;
//Initialize Array Lists
ArrayList mainlinkresults = new ArrayList();
ArrayList anouncementresults = new ArrayList();
String firstnameresult = null;
Principal user = request.getUserPrincipal();
String username = user.getName();
Properties props = new Properties();
InputStream in = getServletContext().getResourceAsStream(
"/WEB-INF/sql.properties");
props.load(in);
in.close();
//get Users login name to pass on
try {
Class.forName(props.getProperty("connection.driver"));
con = DriverManager.getConnection(props.getProperty("connection.url"), props);
stmt = con.prepareStatement(USERQUERY);
stmt.setString(1, username);
namers = stmt.executeQuery();
while (namers.next()) {
firstnameresult = namers.getString("firstname");
//results.add(namers.getString("firstname"))
catch (SQLException ex1) {
catch (ClassNotFoundException ex) {
finally {
if (stmt != null) {
try {
stmt.close();
catch (SQLException e) {
e.printStackTrace();
stmt = null;
if (con != null) {
try {
con.close();
catch (SQLException e) {
e.printStackTrace();
con = null;
//get the main links to pass on
try {
Class.forName(props.getProperty("connection.driver"));
con = DriverManager.getConnection(props.getProperty("connection.url"), props);
stmt = con.prepareStatement(MAINLINKQUERY);
mainlinkrs = stmt.executeQuery();
while (mainlinkrs.next()) {
mainlinkresults.add(mainlinkrs.getString("name"))
catch (SQLException ex1) {
catch (ClassNotFoundException ex) {
finally {
if (stmt != null) {
try {
stmt.close();
catch (SQLException e) {
e.printStackTrace();
stmt = null;
if (con != null) {
try {
con.close();
catch (SQLException e) {
e.printStackTrace();
con = null;
//get the announcements to pass on
try {
Class.forName(props.getProperty("connection.driver"));
con = DriverManager.getConnection(props.getProperty("connection.url"), props);
stmt = con.prepareStatement(ANOUNCEMENTQUERY);
anouncementrs = stmt.executeQuery();
while (anouncementrs.next()) {
anouncementresults.add(anouncementrs.getString("anouncement"));
catch (SQLException ex1) {
catch (ClassNotFoundException ex) {
finally {
if (stmt != null) {
try {
stmt.close();
catch (SQLException e) {
e.printStackTrace();
stmt = null;
if (con != null) {
try {
con.close();
catch (SQLException e) {
e.printStackTrace();
con = null;
request.setAttribute("firstname", firstnameresult);
request.setAttribute("mainlink", mainlinkresults);
request.setAttribute("anouncement", anouncementresults);
RequestDispatcher rd =
request.getRequestDispatcher("home.jsp");
rd.forward(request, response);
//Clean up resources
public void destroy() {
JSP Page
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jstl/sql" prefix="sql" %>
<%@ taglib uri="http://java.sun.com/jstl/xml" prefix="x" %>
<html>
<head>
<title>
index
</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><style type="text/css">
<!--
body {
     margin-left: 0px;
     margin-top: 0px;
     margin-right: 0px;
     margin-bottom: 0px;
-->
</style></head>
<body bgcolor="#008000">
<table width="100%" border="1" cellspacing="0" bordercolor="#000000">
<tr>
<td bgcolor="#FFFFFF"><h1>Welcome to NNET <c:out value="${requestScope.firstname}" /></h1>
</td>
</tr>
</table>
<br>
<table width="100%" border="0" cellspacing="0">
<tr>
<td width="150"><table width="100%" border="1" cellspacing="0" bordercolor="#000000" bgcolor="#FFFFFF">
<tr>
<td><strong>Main Links </strong></td>
</tr>
<c:forEach var="item" items="${requestScope.mainlink}">
<tr>
<td valign="top"><c:out value="${item}"/></td>
</tr>
</c:forEach>
</table>
<p> </p></td>
<td><table width="100%" border="0" cellspacing="0" bgcolor="#FFFFFF">
<tr>
<td valign="top"><h2>Announcements</h2>
<p>
<c:forEach var="item" items="${requestScope.anouncement}">
<c:out value="${item}" />
</c:forEach>
</p>
</td>
</tr>
</table></td>
<td width="150"> </td>
</tr>
</table>
</body>
</html>

Answer 1

OK if you look at the code I pasted above I have doen that. I hav ethat book and it is good. My question is how do I get the data read into a multidemisional array or an arraylist like I am using in the code above so I can access that on the jsp page. Can you give an example. Here is what I want . I have a table called anouncements with 3 fields (ID, name, url) I am returning say 10 results. I want to store them in a single arraylist or multideminsional array and call them on the jsp page. What syntax would I use on the servlet and on the jsp page for this? I know how to do it as seen above when I return only one field with many results from the database. Thank you in advance for any help