Notas de Rua: Curso Struts

Para essa nova aula precisamos de uma nova biblioteca: struts-extras-1.3.8.jar br.com.livrariaweb.entidades.Usuario

package br.com.livrariaweb.entidades;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Usuario {

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 private Integer id;

 @Column(nullable = false)
 private String login;

 @Column(nullable = false)
 private String nome;

 @Column(nullable = false)
 private String senha;

       //gets e sets

br.com.livrariaweb.servico.UsuarioServico

package br.com.livrariaweb.servico;

import java.util.List;

import org.hibernate.Session;

import br.com.livrariaweb.entidades.Usuario;
import br.com.livrariaweb.util.HibernateUtil;

public class UsuarioServico {

 public List listar() {
  return HibernateUtil.getSession().createCriteria(Usuario.class).list();
 }

 public Usuario carregar(Integer id) {
  return (Usuario) HibernateUtil.getSession().load(Usuario.class, id);
 }

 public void salvar(Usuario usuario) {
  Session s = HibernateUtil.getSession();
  s.beginTransaction();
  if (usuario.getId() == 0)
   s.save(usuario);
  else
   s.update(usuario);
  s.getTransaction().commit();
  s.close();
 }

 public void excluir(Usuario usuario) {
  Session s = HibernateUtil.getSession();
  s.beginTransaction();
  s.delete(usuario);
  s.getTransaction().commit();
  s.close();
 }
}

br.com.livrariaweb.util.HibernateUtil

package br.com.livrariaweb.util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

public class HibernateUtil {

 private static final SessionFactory sessionFactory;

 static {
  try {
   // Criando a SessionFactory apartir no hibernate.cfg.xml
   sessionFactory = new AnnotationConfiguration().configure()
     .buildSessionFactory();
  } catch (Throwable ex) {
   System.err.println("Não foi possivel criar a SessionFactory." + ex);
   throw new ExceptionInInitializerError(ex);
  }
 }

 public static Session getSession() {
  return sessionFactory.openSession();
 }

}

hibernate.cfg.xml

<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>

 <session-factory>

       <!-- Database connection settings -->
       <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
       <property name="connection.url">jdbc:mysql://localhost/livrariaweb</property>
       <property name="connection.username">root</property>
       <property name="connection.password">root</property>
       <property name="connection.pool_size">1</property>

       <!-- SQL dialect -->
       <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

       <property name="show_sql">true</property>

       <property name="hbm2ddl.auto">update</property>

  <mapping class="br.com.livrariaweb.entidades.Livro"/>
  <mapping class="br.com.livrariaweb.entidades.Usuario"/>
  
 </session-factory>

</hibernate-configuration>

br.com.livrariaweb.controle.UsuarioAction

package br.com.livrariaweb.controle;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;

import br.com.livrariaweb.entidades.Usuario;
import br.com.livrariaweb.servico.UsuarioServico;

public class UsuarioAction extends DispatchAction {

 private UsuarioServico servico = new UsuarioServico();

 public ActionForward listar(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {

  request.setAttribute("usuarios", servico.listar());

  return mapping.findForward("listar");
 }

 public ActionForward salvar(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {

  Usuario u = ((UsuarioForm) form).getUsuario();
  servico.salvar(u);

  request.setAttribute("usuarios", servico.listar());

  return mapping.findForward("listar");
 }

 public ActionForward carregar(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {

  Integer id = Integer.valueOf(request.getParameter("idUsuario"));
  Usuario u = servico.carregar(id);

  ((UsuarioForm) form).setUsuario(u);

  return mapping.findForward("formulario");
 }

 public ActionForward excluir(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {

  Integer id = Integer.valueOf(request.getParameter("idUsuario"));
  Usuario u = servico.carregar(id);
  servico.excluir(u);

  request.setAttribute("usuarios", servico.listar());

  return mapping.findForward("listar");
 }
}

br.com.livrariaweb.controle.UsuarioForm

package br.com.livrariaweb.controle;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import br.com.livrariaweb.entidades.Usuario;

public class UsuarioForm extends ActionForm {

 private Usuario usuario = new Usuario();

 public Usuario getUsuario() {
  return usuario;
 }

 public void setUsuario(Usuario usuario) {
  this.usuario = usuario;
 }

 @Override
 public ActionErrors validate(ActionMapping mapping,
   HttpServletRequest request) {

  ActionErrors erros = new ActionErrors();
  if (usuario.getLogin() != null
    && usuario.getLogin().trim().length() == 0) {
   erros.add("usuario.login", new ActionMessage(
     "form.campoObrigatorio", "Login"));
  }
  if (usuario.getNome() != null && usuario.getNome().trim().length() == 0) {
   erros.add("usuario.nome", new ActionMessage(
     "form.campoObrigatorio", "Nome"));
  }
  if (usuario.getSenha() != null
    && usuario.getSenha().length() == 0) {
   erros.add("usuario.senha", new ActionMessage(
     "form.campoObrigatorio", "Senha"));
  }
  return erros;
 }

}

mensagem.properties

form.campoObrigatorio={0}: Campo Obrigatório
form.salvar=salvar

struts-config.xml

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE struts-config PUBLIC
         "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
         "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>

 <!-- Definicao dos Formulario de Beans -->
 <form-beans>
  <form-bean name="livroForm"
   type="br.com.livrariaweb.controle.LivroForm" />
  <form-bean name="usuarioForm"
   type="br.com.livrariaweb.controle.UsuarioForm" />
 </form-beans>

 <!-- Definicao de Excecoes Globais -->
 <global-exceptions></global-exceptions>

 <!-- Definicao de Redirecionamento Global -->
 <global-forwards>
  <forward name="inicio" path="/Inicio.do" />
 </global-forwards>

 <!-- Mapeamento de Acoes -->
 <action-mappings>
  <action path="/Inicio" forward="/jsp/inicio.jsp" />

  <action path="/Livros"
   type="br.com.livrariaweb.controle.LivroAction">
   <forward name="listar" path="/jsp/livro/listar.jsp" />
  </action>

  <action path="/LivroSalvar"
   type="br.com.livrariaweb.controle.LivroSalvarAction" name="livroForm"
   scope="request" input="/jsp/livro/criar.jsp">
   <forward name="listar" path="/Livros.do" redirect="true" />
  </action>

  <action path="/usuario"
   type="br.com.livrariaweb.controle.UsuarioAction" name="usuarioForm"
   scope="request" input="/jsp/usuario/formulario.jsp"
   parameter="metodo" validate="true">
   <forward name="listar" path="/jsp/usuario/listar.jsp" />
   <forward name="formulario" path="/jsp/usuario/formulario.jsp" />
  </action>

 </action-mappings>

 <!-- Arquivo de Definicao de Mensagens -->
 <message-resources parameter="mensagem" />

</struts-config>

jsp/usuario/listar.jsp

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic"%>
<%@ taglib uri="http://struts.apache.org/tags-nested" prefix="nested"%>

<html:html>
<body>
<h1>Usuário</h1>
<table border="1" cellpadding="1">
 <tr>
  <th>Login</th>
  <th>Nome</th>
  <th>Senha</th>
 </tr>
 <logic:iterate id="u" name="usuarios">
  <tr>
   <td><bean:write name="u" property="login" /></td>
   <td><bean:write name="u" property="nome" /></td>
   <td><bean:write name="u" property="senha" /></td>
   <td><html:link action="/usuario.do">
    Editar
    <html:param name="idUsuario">
     <bean:write name="u" property="id" />
    </html:param>
    <html:param name="metodo">carregar</html:param>
   </html:link></td>
   <td><html:link action="/usuario.do">
    Excluir
    <html:param name="idUsuario">
     <bean:write name="u" property="id" />
    </html:param>
    <html:param name="metodo">excluir</html:param>
   </html:link></td>
  </tr>
 </logic:iterate>
</table>
<p><html:link href="jsp/usuario/formulario.jsp">Novo Usuário</html:link></p>
</body>
</html:html>

jsp/usuario/formulario.jsp

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic"%>
<%@ taglib uri="http://struts.apache.org/tags-nested" prefix="nested"%>

<html:html>
<body>
<h3 style="color: red;">
 <html:messages id="erro">
  <li><bean:write name="erro" /></li>
 </html:messages>
</h3>
<html:form action="/usuario.do" focus="usuario.login">
 <logic:present name="usuario">
  <h1>Editar Usuário</h1>
 </logic:present>
 <logic:notPresent name="usuario">
  <h1>Criar Usuário</h1>
 </logic:notPresent>
 <html:hidden property="usuario.id" />
 <p><b>Login:</b><br>
 <html:text property="usuario.login" /></p>
 <p><b>Nome:</b><br>
 <html:text property="usuario.nome" /></p>
 <p><b>Senha:</b><br>
 <html:password property="usuario.senha" /></p>

 <html:submit property="metodo">
  <bean:message key="form.salvar"/>
 </html:submit>
</html:form>
</body>
</html:html>

Notas de Rua

9 de dez. de 2007

Curso Struts - Aula 02

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