Please find the problem in this code.

[Ajay Xavier]

hi,

I am a beginner in socket programming. I wrote a sample program to echo the contents received from the client.

server program:

public class TestServer implements Runnable{
 
ServerSocket serverSock = null;
Socket clientSock = null;

public void run()
{
while(true)
{
try
{
clientSock = serverSock.accept();
System.out.println("conected and the socket returned is"+clientSock.getLocalPort()+clientSock);

TestReceive receive = new TestReceive(clientSock);
Thread receiverThread = new Thread(receive);
receiverThread.start();

}
catch(Exception e)
{
e.printStackTrace();
}


}

}
public void execute()
{
try
{
System.out.println("socket to be created");
serverSock = new ServerSocket(5522);
System.out.println("waiting for the client to conect");
Thread testThread = new Thread(this);
testThread.start();

}
catch(Exception e)
{
e.printStackTrace();
}
}

public static void main(String[] args) {

TestServer test = new TestServer();
test.execute();


}
}

This programs opens a server socket and waits for client connection. "testThread" is used to serve multiple clients. For each client a seperate thread is spawn to echo the contents. The code for that thread is

 public class TestReceive implements Runnable{

Socket sock = null;
BufferedReader br = null;

public TestReceive(Socket sc)
{
sock = sc;
}

public void run()
{
try
{
br = new BufferedReader(new InputStreamReader(sock.getInputStream()));
System.out.println("Socket in receive is"+sock);
while(true)
{
System.out.println("got inside the loop");
String readLine = br.readLine();
System.out.println(readLine);
PrintWriter os = new PrintWriter(sock.getOutputStream());
os.println(readLine);


}
}
catch(Exception e)
{
e.printStackTrace();
}

finally
{
try
{
br.close();
sock.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
 
}

The client program is

public class TestClient {
 
public static void main(String[] args) {

Socket socket = null;
PrintWriter out = null;
try
{
socket = new Socket("127.0.0.1", 5522);
System.out.println("This is on the client side--- socket created");

out = new PrintWriter(socket.getOutputStream());
out.println("this is my first socket program");

System.out.println("The data has been written to the server");
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
System.out.println(br.readLine());

}
catch(Exception e)
{
e.printStackTrace();
}

finally
{
try
{
out.close();
socket.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
}

there will be many clients like this.

Running this code produces the following output
for Server

   
socket to be created
waiting for the client to conect
conected and the socket returned is5522Socket[addr=localhost/127.0.0.1,port=3981,localport=5522]
Socket in receive isSocket[addr=localhost/127.0.0.1,port=3981,localport=5522]
got inside the loop

for client

This is on the client side--- socket created
The data has been written to the server
 

Once the data is written at the client side the server is not picking this data and echoing it back.

Please identify where the problem is .

[Layne Lund]

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