validação de usuario

/*
 * Teste.java
 *
 * Created on 1 de Setembro de 2007, 19:34
 */
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.microedition.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
 *
 * @author Administrador
 */
public class Teste extends MIDlet implements CommandListener {
    
    /** Creates a new instance of Teste */
    public Teste() {
        initialize();
    }
    
    private Form formPrincipal;                     
    private Form formEscolha;
    private Command exitCommand1;
    private Command okCommand1;
    private TextField textFieldLogin;
    private TextField textFieldSenha;
    private Command okCommand2;
    private Command backCommand1;
    private Form formChassi;
    private Command backCommand2;
    private Command okCommand3;
    private Command exitCommand2;
    private Command exitCommand3;
    private Form formPlaca;
    private Command backCommand3;
    private Command exitCommand4;
    private Command okCommand4;
    private TextField textFieldPlaca;
    private TextField textFieldChassi;
    private Command screenCommand1;
    private Command screenCommand2;
    private StringItem stringItem1;                   
    
                     
    private Alert alerta;
    private Alert alerta2;
    private String errorMsg = null;
        /** Called by the system to indicate that a command has been invoked on a particular displayable.                      
         * @param command the Command that ws invoked
         * @param displayable the Displayable on which the command was invoked
         */
        public void commandAction(Command command, Displayable displayable) {                    
            // Insert global pre-action code here
            if (displayable == formPrincipal) {                     
                if (command == okCommand1) {                   
                    try {
                         validarUsuario(textFieldLogin.getString(), textFieldSenha.getString());
                    } catch (Exception e) {
                        System.err.println("Msg: " + e.toString());
                    }// Insert pre-action code here
                // Do nothing                       
                    // Insert post-action code here
                } else if (command == exitCommand1) {                     
                    try {
                        destroyApp(false);
                        notifyDestroyed();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }// Insert pre-action code here
                exitMIDlet();                       
                // Insert post-action code here
                }                      
            } else if (displayable == formEscolha) {
                if (command == backCommand1) {                    
                    // Insert pre-action code here
                    getDisplay().setCurrent(get_formPrincipal());                        
                    // Insert post-action code here
                } else if (command == exitCommand3) {                      
                    // Insert pre-action code here
                    exitMIDlet();                        
                    // Insert post-action code here
                } else if (command == screenCommand1) {                      
                    // Insert pre-action code here
                    getDisplay().setCurrent(get_formChassi());                        
                    // Insert post-action code here
                } else if (command == screenCommand2) {                      
                    // Insert pre-action code here
                    getDisplay().setCurrent(get_formPlaca());                        
                    // Insert post-action code here
                }                       
            } else if (displayable == formPlaca) {
                if (command == backCommand3) {                     
                    // Insert pre-action code here
                    getDisplay().setCurrent(get_formEscolha());                        
                    // Insert post-action code here
                } else if (command == exitCommand4) {                      
                    // Insert pre-action code here
                    exitMIDlet();                        
                    // Insert post-action code here
                } else if (command == okCommand4) {                      
                    // Insert pre-action code here
                    // Do nothing                        
                    // Insert post-action code here
                }                       
            } else if (displayable == formChassi) {
                if (command == backCommand2) {                     
                    // Insert pre-action code here
                    getDisplay().setCurrent(get_formEscolha());                        
                    // Insert post-action code here
                } else if (command == exitCommand2) {                      
                    // Insert pre-action code here
                    // Do nothing                        
                    // Insert post-action code here
                } else if (command == okCommand3) {                      
                    // Insert pre-action code here
                    // Do nothing                        
                    // Insert post-action code here
                }                       
            }                     
            // Insert global post-action code here
}                   
        
        /** This method initializes UI of the application.                        
         */
        private void initialize() {                      
            // Insert pre-init code here
            getDisplay().setCurrent(get_formPrincipal());                      
            // Insert post-init code here
        }                     
        
        /**
         * This method should return an instance of the display.
         */
    public Display getDisplay() {                         
        return Display.getDisplay(this);
    }                        
    
    /**
     * This method should exit the midlet.
     */
    public void exitMIDlet() {                         
        getDisplay().setCurrent(null);
        destroyApp(true);
        notifyDestroyed();
    }                        
    
    /** This method returns instance for formPrincipal component and should be called instead of accessing formPrincipal field directly.                        
     * @return Instance for formPrincipal component
     */
    public Form get_formPrincipal() {
        if (formPrincipal == null) {                      
            // Insert pre-init code here
            formPrincipal = new Form("Autentica\u00E7\u00E3o", new Item[] {                       
                get_textFieldLogin(),
                get_textFieldSenha()
            });
            formPrincipal.addCommand(get_exitCommand1());
            formPrincipal.addCommand(get_okCommand1());
            formPrincipal.setCommandListener(this);                     
            // Insert post-init code here
        }                      
        return formPrincipal;
    }                    
    
    /** This method returns instance for formEscolha component and should be called instead of accessing formEscolha field directly.                        
     * @return Instance for formEscolha component
     */
    public Form get_formEscolha() {
        if (formEscolha == null) {                      
            // Insert pre-init code here
            formEscolha = new Form("Tipo de Consulta", new Item[] {get_stringItem1()});                       
            formEscolha.addCommand(get_backCommand1());
            formEscolha.addCommand(get_exitCommand3());
            formEscolha.addCommand(get_screenCommand1());
            formEscolha.addCommand(get_screenCommand2());
            formEscolha.setCommandListener(this);                     
            // Insert post-init code here
        }                      
        return formEscolha;
    }                    
    
    /** This method returns instance for exitCommand1 component and should be called instead of accessing exitCommand1 field directly.                        
     * @return Instance for exitCommand1 component
     */
    public Command get_exitCommand1() {
        if (exitCommand1 == null) {                      
            // Insert pre-init code here
            exitCommand1 = new Command("Sair", Command.EXIT, 1);                      
            // Insert post-init code here
        }                      
        return exitCommand1;
    }                    
    
    /** This method returns instance for okCommand1 component and should be called instead of accessing okCommand1 field directly.                        
     * @return Instance for okCommand1 component
     */
    public Command get_okCommand1() {
        if (okCommand1 == null) {                      
            // Insert pre-init code here
            okCommand1 = new Command("Logar", Command.OK, 1);                      
            // Insert post-init code here
        }                      
        return okCommand1;
    }                    
    
    /** This method returns instance for textFieldLogin component and should be called instead of accessing textFieldLogin field directly.                        
     * @return Instance for textFieldLogin component
     */
    public TextField get_textFieldLogin() {
        if (textFieldLogin == null) {                      
            // Insert pre-init code here
            textFieldLogin = new TextField("Login", null, 120, TextField.ANY);                      
            // Insert post-init code here
        }                      
        return textFieldLogin;
    }                    
    
    /** This method returns instance for textFieldSenha component and should be called instead of accessing textFieldSenha field directly.                        
     * @return Instance for textFieldSenha component
     */
    public TextField get_textFieldSenha() {
        if (textFieldSenha == null) {                      
            // Insert pre-init code here
            textFieldSenha = new TextField("Senha", null, 120, TextField.ANY | TextField.PASSWORD);                      
            // Insert post-init code here
        }                      
        return textFieldSenha;
    }                    
    
    /** This method returns instance for okCommand2 component and should be called instead of accessing okCommand2 field directly.                         
     * @return Instance for okCommand2 component
     */
    public Command get_okCommand2() {
        if (okCommand2 == null) {                       
            // Insert pre-init code here
            okCommand2 = new Command("Ok", Command.OK, 1);                       
            // Insert post-init code here
        }                       
        return okCommand2;
    }                     
    
    /** This method returns instance for backCommand1 component and should be called instead of accessing backCommand1 field directly.                         
     * @return Instance for backCommand1 component
     */
    public Command get_backCommand1() {
        if (backCommand1 == null) {                       
            // Insert pre-init code here
            backCommand1 = new Command("Voltar", Command.BACK, 1);                       
            // Insert post-init code here
        }                       
        return backCommand1;
    }                     
    
    
    /** This method returns instance for formChassi component and should be called instead of accessing formChassi field directly.                         
     * @return Instance for formChassi component
     */
    public Form get_formChassi() {
        if (formChassi == null) {                       
            // Insert pre-init code here
            formChassi = new Form("Chassi", new Item[] {get_textFieldChassi()});                        
            formChassi.addCommand(get_backCommand2());
            formChassi.addCommand(get_okCommand3());
            formChassi.addCommand(get_exitCommand2());
            formChassi.setCommandListener(this);                      
            // Insert post-init code here
        }                       
        return formChassi;
    }                     
    
    /** This method returns instance for backCommand2 component and should be called instead of accessing backCommand2 field directly.                         
     * @return Instance for backCommand2 component
     */
    public Command get_backCommand2() {
        if (backCommand2 == null) {                       
            // Insert pre-init code here
            backCommand2 = new Command("Voltar", Command.BACK, 1);                       
            // Insert post-init code here
        }                       
        return backCommand2;
    }                     
    
    /** This method returns instance for okCommand3 component and should be called instead of accessing okCommand3 field directly.                         
     * @return Instance for okCommand3 component
     */
    public Command get_okCommand3() {
        if (okCommand3 == null) {                       
            // Insert pre-init code here
            okCommand3 = new Command("Consultar", Command.OK, 1);                       
            // Insert post-init code here
        }                       
        return okCommand3;
    }                     
    
    /** This method returns instance for exitCommand2 component and should be called instead of accessing exitCommand2 field directly.                         
     * @return Instance for exitCommand2 component
     */
    public Command get_exitCommand2() {
        if (exitCommand2 == null) {                       
            // Insert pre-init code here
            exitCommand2 = new Command("Sair", Command.EXIT, 1);                       
            // Insert post-init code here
        }                       
        return exitCommand2;
    }                     
    
    /** This method returns instance for exitCommand3 component and should be called instead of accessing exitCommand3 field directly.                         
     * @return Instance for exitCommand3 component
     */
    public Command get_exitCommand3() {
        if (exitCommand3 == null) {                       
            // Insert pre-init code here
            exitCommand3 = new Command("Sair", Command.EXIT, 1);                       
            // Insert post-init code here
        }                       
        return exitCommand3;
    }                     
    
    /** This method returns instance for formPlaca component and should be called instead of accessing formPlaca field directly.                         
     * @return Instance for formPlaca component
     */
    public Form get_formPlaca() {
        if (formPlaca == null) {                       
            // Insert pre-init code here
            formPlaca = new Form("Placa", new Item[] {get_textFieldPlaca()});                        
            formPlaca.addCommand(get_backCommand3());
            formPlaca.addCommand(get_exitCommand4());
            formPlaca.addCommand(get_okCommand4());
            formPlaca.setCommandListener(this);                      
            // Insert post-init code here
        }                       
        return formPlaca;
    }                     
    
    /** This method returns instance for backCommand3 component and should be called instead of accessing backCommand3 field directly.                         
     * @return Instance for backCommand3 component
     */
    public Command get_backCommand3() {
        if (backCommand3 == null) {                       
            // Insert pre-init code here
            backCommand3 = new Command("Voltar", Command.BACK, 1);                       
            // Insert post-init code here
        }                       
        return backCommand3;
    }                     
    
    /** This method returns instance for exitCommand4 component and should be called instead of accessing exitCommand4 field directly.                         
     * @return Instance for exitCommand4 component
     */
    public Command get_exitCommand4() {
        if (exitCommand4 == null) {                       
            // Insert pre-init code here
            exitCommand4 = new Command("Sair", Command.EXIT, 1);                       
            // Insert post-init code here
        }                       
        return exitCommand4;
    }                     
    
    /** This method returns instance for okCommand4 component and should be called instead of accessing okCommand4 field directly.                         
     * @return Instance for okCommand4 component
     */
    public Command get_okCommand4() {
        if (okCommand4 == null) {                       
            // Insert pre-init code here
            okCommand4 = new Command("Consultar", Command.OK, 1);                       
            // Insert post-init code here
        }                       
        return okCommand4;
    }                     
    
    /** This method returns instance for textFieldPlaca component and should be called instead of accessing textFieldPlaca field directly.                         
     * @return Instance for textFieldPlaca component
     */
    public TextField get_textFieldPlaca() {
        if (textFieldPlaca == null) {                       
            // Insert pre-init code here
            textFieldPlaca = new TextField("Placa", null, 120, TextField.ANY);                       
            // Insert post-init code here
        }                       
        return textFieldPlaca;
    }                     
    
    /** This method returns instance for textFieldChassi component and should be called instead of accessing textFieldChassi field directly.                         
     * @return Instance for textFieldChassi component
     */
    public TextField get_textFieldChassi() {
        if (textFieldChassi == null) {                       
            // Insert pre-init code here
            textFieldChassi = new TextField("Chassi", null, 120, TextField.ANY);                       
            // Insert post-init code here
        }                       
        return textFieldChassi;
    }                     
    
    /** This method returns instance for screenCommand1 component and should be called instead of accessing screenCommand1 field directly.                         
     * @return Instance for screenCommand1 component
     */
    public Command get_screenCommand1() {
        if (screenCommand1 == null) {                       
            // Insert pre-init code here
            screenCommand1 = new Command("Chassi", Command.SCREEN, 1);                       
            // Insert post-init code here
        }                       
        return screenCommand1;
    }                     
    
    /** This method returns instance for screenCommand2 component and should be called instead of accessing screenCommand2 field directly.                         
     * @return Instance for screenCommand2 component
     */
    public Command get_screenCommand2() {
        if (screenCommand2 == null) {                       
            // Insert pre-init code here
            screenCommand2 = new Command("Placa", Command.SCREEN, 1);                       
            // Insert post-init code here
        }                       
        return screenCommand2;
    }                     
    
    /** This method returns instance for stringItem1 component and should be called instead of accessing stringItem1 field directly.                         
     * @return Instance for stringItem1 component
     */
    public StringItem get_stringItem1() {
        if (stringItem1 == null) {                       
            // Insert pre-init code here
            stringItem1 = new StringItem("Tipo de Consulta: ", "Por Favor, clique no Menu/Bot\u00F5es para escolher o tipo de consulta. Obrigado(a)!");                       
            // Insert post-init code here
        }                       
        return stringItem1;
    }                     
    
       private void showAlert(String Msg) {
        alerta = new Alert("Erro", Msg, null, AlertType.ERROR);
        alerta.setTimeout(Alert.FOREVER);
        getDisplay().setCurrent(get_formPrincipal());
    }
     
     public void validarUsuario(String textFieldLogin, String textFieldSenha)
     {
        if(textFieldLogin.equals(" ") || textFieldSenha.equals(" "))
        {
            tryAgain();
        }
        else
        {
            loginPost();
        }
     }
     
     public void tryAgain()
     {
        Alert error = new Alert("Erro", "Usuario/Senha não pode ser nulo", null, AlertType.ERROR);
        error.setTimeout(Alert.FOREVER);
        textFieldLogin.setString("");
        textFieldSenha.setString("");
        getDisplay().setCurrent(get_formPrincipal());
     }
    
    private void loginPost() {
        Thread t = new Thread(new Runnable() {
            public void run() {
                HttpConnection http = null;
                DataOutputStream oStrm = null;
                DataInputStream iStrm = null;
                boolean ret = false;
                
                //os dados são passados como um fluxo separado para post
                String url = "http://localhost:8080/TesteSap/TesteSap";
                try {
                    //abrindo a conexao:
                    http = (HttpConnection) Connector.open(url, Connector.READ_WRITE);
                    oStrm = http.openDataOutputStream();
                    
                    //aqui vem o pedido do cliente:
                    
                    //enviando o tipo de pedido:
                    http.setRequestMethod(HttpConnection.POST);
                    
                    //enviando informações de cabeçalho:
                    http.setRequestProperty("Content-Language","en-US");
                    http.setRequestProperty("User-Agent","Profile/MIDP-2.0, Configuration/CLDC-1.0");
                    http.setRequestProperty("Conexão", "close");
                    
                    //enviando dados e corpo:
                    
                    //gravando o nome de login:
                    byte data[] = ("login=" + textFieldLogin.getString()).getBytes();
                    oStrm.write(data);
                    
                    //gravando a senha:
                    data = ("&senha=" + textFieldSenha.getString()).getBytes();
                    oStrm.write(data);
                    oStrm.flush();
                    
                    //aqui vem a resposta do servidor:
                    iStrm = http.openDataInputStream();
                    
                    ret = respostaServidor(http, iStrm);
                    
                } catch (IOException e){ e.printStackTrace(); } finally {
                    if(iStrm != null)
                        try {
                            iStrm.close();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    if(http != null)
                        try {
                            http.close();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                }
                if(ret == false)
                    showAlert(errorMsg);
            }
        });
        t.start();
    }
    
    //aqui vem a resposta do servidor que é chamada no método loginPost...
    private boolean respostaServidor(HttpConnection http, InputStream iStrm) throws IOException {
        //aqui a mensagem de erro é reconfigurada:
        errorMsg = null;
        
        //aqui a linha de status é obtida
        if(http.getResponseCode() == HttpConnection.HTTP_OK) {
            //aqui é obtido o corpo de dados:
            int length = (int) http.getLength();
            String str;
            if(length != -1) {
                byte servletData[] = new byte[length];
                iStrm.read(servletData);
                str = new String(servletData);
            } else {
                ByteArrayOutputStream bStrm = new ByteArrayOutputStream();
                int ch;
                while ((ch = iStrm.read()) != -1)
                    bStrm.write(ch);
                str = new String(bStrm.toByteArray());
                bStrm.close();
            }
            getDisplay().setCurrent(get_formEscolha());
            return true;
        } else
            //mensagem da servlet...
            errorMsg = new String(http.getResponseMessage());
        return false;
    }
    
    
    public void startApp() {
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
    }

}