Trouble with database data retrieving!!!Please someone help me!!
Hello people!!
I'm havin g a trouble in getting the data from a bean , someone could give me a hand?
That's the following: The Database class get a conection, a DetalhesLivro.class arraylist
is obtained with the method getBooks, and I start my servlets apllication with contextListener
where i staciate this class, so when i retrieving the value the browser keep too long loading
and give me no data from the class here is piece of code :
the context:
package servlets;
import java.sql.Connection;
import java.sql.SQLException;
import javax.servlet.*;
public final class Contexto implements ServletContextListener{
private ServletContext context = null;
public Database db;
public void contextInitialized(ServletContextEvent event) {
context = event.getServletContext();
try {
db = new Database();
context.setAttribute("dados", db);
} catch (Exception ex) {
System.out.println("Imposs�vel a cria��o do bean:" +
ex.getMessage());
public void contextDestroyed(ServletContextEvent event) {
context = event.getServletContext();
Database lixo = (Database)context.getAttribute("dados");
if (lixo != null)
lixo.remove();
and this is the class to retrieving the data :
package servlets;
import java.io.*;
import java.sql.SQLException;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Resultado extends HttpServlet {
DetalhesLivros livro;
Database db;
ArrayList livros;
public void init() throws ServletException {
db = (Database)getServletContext().getAttribute("dados");
if (db == null){
throw new UnavailableException("Couldn't get database.");
public void destroy() {
db = null;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
/* HttpSession session = request.getSession();
procura = (Procura)session.getAttribute("dados"); */
response.setContentType("text/html");
response.setBufferSize(8192);
String valorRadio = request.getParameter("radio");
String valorInput = request.getParameter("campo");
try{
livros = db.getBooks();
}catch(Exception e){
e.getMessage();
PrintWriter out = response.getWriter();
// then write the data of the response
out.println("<html><head><title>Livraria Online!!!</title></head><body><div align=\"center\"><p><strong>"+
"<p><font size=\"+7\">Loja de Livros</font></p>");
Iterator iterator = livros.iterator();
try{
while(iterator.hasNext()){
if(valorRadio=="titulo"){
livro = (DetalhesLivros)iterator.next();
if(livro.getTitulo()==valorInput){
out.println("<p> </p><p><strong>Nome do Livro:"+livro.titulo+
"</strong></p><p><strong>Autor:"+livro.autor+"</strong></p><p><strong>Preço:"+livro.getPreco()+"</strong>"+
"</p><p><strong>Código:"+livro.getCod()+"</strong></p>");
break;
break;
}catch(Exception e){
e.getMessage();
out.println("<p></p><br><br><br><table width=\"48%\" border=\"0\"><tr><td width=\"60%\"><a href=\"\"><strong>Pesquisar</strong>"+
"</a></td><td width=\"40%\"><a href=\"\"><strong>Listar</strong></a></td></tr></table><strong>"+
"</strong></div></body></html>");
out.close();
thanks a lot for some help!!!
sorry!!
package servlets;
import java.sql.Connection;
import java.sql.SQLException;
import javax.servlet.*;
public final class Contexto implements ServletContextListener{
private ServletContext context = null;
public Database db;
public void contextInitialized(ServletContextEvent event) {
context = event.getServletContext();
try {
db = new Database();
context.setAttribute("dados", db);
} catch (Exception ex) {
System.out.println("Imposs�vel a cria��o do bean:" +
ex.getMessage());
public void contextDestroyed(ServletContextEvent event) {
context = event.getServletContext();
Database lixo = (Database)context.getAttribute("dados");
if (lixo != null)
lixo.remove();
}package servlets;
import java.io.*;
import java.sql.SQLException;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Resultado extends HttpServlet {
DetalhesLivros livro;
Database db;
ArrayList livros;
public void init() throws ServletException {
db = (Database)getServletContext().getAttribute("dados");
if (db == null){
throw new UnavailableException("Couldn't get database.");
public void destroy() {
db = null;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
/* HttpSession session = request.getSession();
procura = (Procura)session.getAttribute("dados"); */
response.setContentType("text/html");
response.setBufferSize(8192);
String valorRadio = request.getParameter("radio");
String valorInput = request.getParameter("campo");
try{
livros = db.getBooks();
}catch(Exception e){
e.getMessage();
PrintWriter out = response.getWriter();
// then write the data of the response
out.println("<html><head><title>Livraria Online!!!</title></head><body><div align=\"center\"><p><strong>"+
"<p><font size=\"+7\">Loja de Livros</font></p>");
Iterator iterator = livros.iterator();
try{
while(iterator.hasNext()){
if(valorRadio=="titulo"){
livro = (DetalhesLivros)iterator.next();
if(livro.getTitulo()==valorInput){
out.println("<p> </p><p><strong>Nome do Livro:"+livro.titulo+
"</strong></p><p><strong>Autor:"+livro.autor+"</strong></p><p><strong>Preço:"+livro.getPreco()+"</strong>"+
"</p><p><strong>Código:"+livro.getCod()+"</strong></p>");
break;
break;
}catch(Exception e){
e.getMessage();
out.println("<p></p><br><br><br><table width=\"48%\" border=\"0\"><tr><td width=\"60%\"><a href=\"\"><strong>Pesquisar</strong>"+
"</a></td><td width=\"40%\"><a href=\"\"><strong>Listar</strong></a></td></tr></table><strong>"+
"</strong></div></body></html>");
out.close();
--------------------------------------------------------------------------------------------
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