Server request through socket

[srinivasan ganesan]

I have my server running at port 2000. I tried to make a request to the server by telnet like
telnet localhost 2000
but I got an error message saying that a connection could not be extablished to localhost. Could anyone tell me what I'm doing wrong.
Thanks,
Srinivas

[Michael Morris]

Hi Srinivas,
It should work fine. Are you getting an exception on the server when you try to connect? What OS are you using? You might need to look at the code where your ServerSocket accepts the connection.
I tested with this code and easily connected thru telnet:

import java.net.*;
import java.io.*;
public class TestSocket {
public static void main (String[] args) {
try {
    ServerSocket serverSocket = new ServerSocket(2000);
    while (true) {
       Socket socket = serverSocket.accept();
       Writer out = new OutputStreamWriter(socket.getOutputStream());
       out.write("Hello from TestSocket!");
       out.flush();
       out.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

If that works, then the problem is in your server.
Hope this helps,
Michael Morris

[srinivasan ganesan]

Michael,
Here's the code that I wrote. I tested your code and it works fine but this one doesn't. Do you find anything wrong?

import java.net.*;
import java.io.*;
public class Server implements Runnable {
public final static int WK_PORT=2000;
public int port;
public ServerSocket service;
public String message="Hello Client!";
public Server(int port_request) {
if(port_request < 1024 || port_request > 65535) {
port=WK_PORT;
}
else
port=port_request;
try {
service = new ServerSocket(port);
}
catch(IOException ioe) {
System.out.println("Error ; Port " + port + " was not available.");
}
System.out.println("Port " + port + " is up and running.");
}
public void run() {
InputStream receiving;
OutputStream sending;
while(true) {
try {
Socket client = service.accept();
sending = client.getOutputStream();
receiving = client.getInputStream();
sending.write(message.getBytes());
}
catch(IOException ioe) {
System.out.println("Could not accept client request or establish streams.");
}
}
}

public static void main(String[] args) {
Server server = new Server(WK_PORT);
}
}
  

Thanks,
Srinivas

[Michael Morris]

Hi Srinivas,
You didn't start a thread.
After creating your Server object try this:

...
    Thread runner = new Thread(server);
    runner.start();

That should do the trick.
Hope this helps,
Michael Morris

[srinivasan ganesan]

Thanks Michael...It worked.