Error : java.net.ConnectException
hi, I have this exception :
java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at Prova_Socket.Prova_SocketClient.setupConnection(Prova_SocketClient.java:37)errore
at Prova_Socket.Prova_SocketClient.main(Prova_SocketClient.java:26)
Exception in thread "main" java.lang.NullPointerException
at Prova_Socket.Prova_SocketClient.getFile(Prova_SocketClient.java:60)
at Prova_Socket.Prova_SocketClient.main(Prova_SocketClient.java:27)
The Source Code is Server :
public class Prova_SocketServerConcorrente
{
private int listenPort = 4035;
private Socket client;
public static void main(String args[])
{
Prova_SocketServer server = new Prova_SocketServer();
server.acceptConnections();
}
public void acceptConnections()
{
try
{
ServerSocket server = new ServerSocket(listenPort);
client = null;
while(true)
{
System.out.println("provo ad accettare");
client = server.accept();
System.out.println("ho accettato");
Esegui esecuzione = new Esegui();
esecuzione.start();
}
}catch(BindException e)
{
System.out.println("unable to bind port");
}
catch(IOException e )
{
System.out.println("Unable to instantiate a ServerSocket on port");
}
}
private class Esegui extends Thread
{
public Esegui()
{
}
public void run()
{
this.doIt();
}
public void doIt()
{ ... }
CLIENT :
public class Prova_SocketClient
{
private String hostip;
private int hostport;
private BufferedReader socket_br;
private PrintWriter socket_pw ;
public Prova_SocketClient (String vhostip , int vhostport)
{
hostip = vhostip;
hostport = vhostport;
}
public static void main(String[] args)
{
Prova_SocketClient prova_client = new Prova_SocketClient("127.0.0.1",4035);
prova_client.setupConnection();
String contenuto = prova_client.getFile("prova.txt");
prova_client.closeConnection();
System.out.println(contenuto);
}
public void setupConnection()
{
try
{
Socket client = new Socket (hostip,hostport);
socket_br = new BufferedReader(new InputStreamReader(client.getInputStream()));
socket_pw = new PrintWriter(client.getOutputStream());
}
catch(UnknownHostException e )
{
e.printStackTrace();
}
catch(IOException e )
{
System.out.println("errore");
e.printStackTrace();
}
}
public String getFile(String fileNameToGet)
{
String testo = null;
try
{
socket_pw.println(fileNameToGet);
socket_pw.flush();
testo ="";
String linea = null;
while((linea = socket_br.readLine())!= null)
{
testo += linea + "\n";
}
}
catch(IOException e)
{
System.out.println("errore nella lettura del file");
}
return testo;
}
public void closeConnection()
{
try
{
socket_pw.close();
socket_br.close();
}
catch(IOException e)
{
System.out.println("errore nella chiusura del socket");
}
}
}
Thanks to all.
