I have a small problem in this code below in java.
It's a multicast chat
Main error is in the commented constructor.
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author tanira
*/
public class EmissorReceptor extends javax.swing.JFrame {
ArrayList<String> listaClientes = new ArrayList<>();
private final int porta;
private final String ip;
InetAddress group;
MulticastSocket s;
//da erro nesse construtor, a causa eh os argumentos que se pede
public EmissorReceptor(String ip, int Porta) {
this.ip = ip;
this.porta = Porta;
}
private EmissorReceptor() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
public void Conecta(String ip, int porta) {
try {
//define o IP do grupo
group = InetAddress.getByName(this.ip);
//cria um socket com a porta expecificada
s = new MulticastSocket(this.porta);
//entra no grupo multicast
s.joinGroup(group);
} catch (IOException e) {
System.out.println("Problemas ao conectar.");
}
}
public void atualizaMsg(String msg) {
this.jTAChat.append(msg + "\n");
}
public void limpaListaClientes() {
this.jTAClientes.setText("");
}
public void atualizaClientes(String cliente) {
if (!listaClientes.contains(cliente)) {
listaClientes.add(cliente);//adicionar um novo cliente caso o nome dele nao esteja na lista dos clientes
}
for (int i = 0; i < listaClientes.size(); i++) {
this.jTAClientes.append(listaClientes.get(i) + "\n");
}
}
public void enviaMsg(String msg) {
try {
Conecta(this.ip, this.porta);
//CRIA UM PACOTE DATAGRAMA
DatagramPacket mensagem = new DatagramPacket(msg.getBytes(), msg.length(), group, porta);
//ENVIA A MENSAGEM AO GRUPO MULTICAST
s.send(mensagem);
} catch (IOException e) {
System.out.println("Problemas ao enviar mensagem.");
}
}
public void recebeMsg(String msg) {
Conecta(this.ip, this.porta);// se conecta ao grupo multicast para pode receber as mensagens
new Thread() {//utiliza thread pra nao bloquear
@Override
@SuppressWarnings("empty-statement")
public void run() {
while (true) {
byte[] bufferRec = new byte[100];
DatagramPacket pacoteRec = new DatagramPacket(bufferRec, bufferRec.length);
try {
s.receive(pacoteRec);
bufferRec = pacoteRec.getData();
String msgRec = new String(bufferRec, 0, pacoteRec.getLength());
String msgRecebida= new String(bufferRec, 0, pacoteRec.getLength());
//trata a msg
msgRec = msgRec.toLowerCase(); //deixa tudo em minusculo
String ajustes = msgRec.replace("disse:", "");// retira o disse: para poder manusear o nick e a msg em si
String partes[] = ajustes.split(" ");//deve ficar partes[0]= NICK || partes[1]= msg
if (!listaClientes.contains(partes[0])) {
listaClientes.add(partes[1]);//adicionar um novo cliente caso AINDA o nome dele nao esteja na lista dos clientes
atualizaClientes(partes[1]);
} else if (partes[0].equals("sair")) {//caso o cliente queira sair retira o nome dlee da lista e mostra a nova no chat
listaClientes.remove(listaClientes.indexOf(partes[0]));
atualizaClientes(listaClientes);
}
//agora passa a msgRec pra tela no atualiza msg (chama o metodo)
atualizaMsg(msgRecebida);
} catch (IOException ex) {
Logger.getLogger(EmissorReceptor.class.getName()).log(Level.SEVERE, null, ex);
System.out.println("Problemas na thread receptora.");
}
}
}
}.start();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jTAChat = new javax.swing.JTextArea();
jLabel1 = new javax.swing.JLabel();
jTFIp = new javax.swing.JTextField();
jLabel2 = new javax.swing.JLabel();
jTFNick = new javax.swing.JTextField();
jBConectar = new javax.swing.JButton();
jLabel3 = new javax.swing.JLabel();
jTFMensagem = new javax.swing.JTextField();
jBEnviar = new javax.swing.JButton();
jScrollPane2 = new javax.swing.JScrollPane();
jTAClientes = new javax.swing.JTextArea();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTAChat.setColumns(20);
jTAChat.setRows(5);
jScrollPane1.setViewportView(jTAChat);
jLabel1.setText("IP Multicast:");
jTFIp.setText("localhost");
jLabel2.setText("Nick:");
jBConectar.setText("Conectar");
jBConectar.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jBConectarActionPerformed(evt);
}
});
jLabel3.setText("Clientes:");
jBEnviar.setText("Enviar");
jBEnviar.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jBEnviarActionPerformed(evt);
}
});
jTAClientes.setColumns(20);
jTAClientes.setRows(5);
jScrollPane2.setViewportView(jTAClientes);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addGroup(layout.createSequentialGroup()
.addComponent(jTFMensagem)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jBEnviar))
.addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.PREFERRED_SIZE, 611, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 188, Short.MAX_VALUE)
.addContainerGap())
.addGroup(layout.createSequentialGroup()
.addGap(5, 5, 5)
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addComponent(jTFIp, javax.swing.GroupLayout.PREFERRED_SIZE, 154, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jLabel2)
.addGap(27, 27, 27)
.addComponent(jTFNick, javax.swing.GroupLayout.PREFERRED_SIZE, 159, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(36, 36, 36)
.addComponent(jBConectar)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel3)
.addGap(88, 88, 88))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(9, 9, 9)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(jTFIp, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2)
.addComponent(jTFNick, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jBConectar)
.addComponent(jLabel3))))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 380, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTFMensagem, javax.swing.GroupLayout.PREFERRED_SIZE, 34, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jBEnviar))
.addGap(0, 0, Short.MAX_VALUE))
.addComponent(jScrollPane2))
.addContainerGap())
);
pack();
}// </editor-fold>//GEN-END:initComponents
private void jBConectarActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jBConectarActionPerformed
//o metodo conecta serve nesse caso principalmente pra salvar o IP do cliente ja que no envia msg ele chamara o
//conecta novamente
Conecta(this.jTFIp.getText(), 3456);//Nesse caso dar uma porta estatica
//atualiza a lista cliente
atualizaClientes(this.jTFNick.getText());
//escreve uma msg no textAreaChat que um determinado usuario se conectou
enviaMsg(this.jTFNick.getText() + " entrou.");
}//GEN-LAST:event_jBConectarActionPerformed
private void jBEnviarActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jBEnviarActionPerformed
enviaMsg(this.jTFNick.getText() + " disse: " + this.jTFMensagem.getText());
}//GEN-LAST:event_jBEnviarActionPerformed
private void jEnviarActionPerformed(java.awt.event.KeyEvent evt) throws IOException {
}
private void jTFMensagemKeyPressed(java.awt.event.KeyEvent evt) {
if (evt.getKeyCode() == KeyEvent.VK_ENTER) {
//para enviar msg apenas com Enter
enviaMsg(this.jTFNick.getText() + " disse: " + this.jTFMensagem.getText());
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(EmissorReceptor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(EmissorReceptor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(EmissorReceptor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(EmissorReceptor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new EmissorReceptor().setVisible(false);
}
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JButton jBConectar;
private javax.swing.JButton jBEnviar;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTextArea jTAChat;
private javax.swing.JTextArea jTAClientes;
private javax.swing.JTextField jTFIp;
private javax.swing.JTextField jTFMensagem;
private javax.swing.JTextField jTFNick;
// End of variables declaration//GEN-END:variables
}