TCPClient TCPServer

package aptech.edu;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

public class TCPClient {

public static void main(String[] args) throws UnknownHostException, IOException {
// TODO Auto-generated method stub

try{
Socket myClient = new Socket("localhost", 9000);

OutputStream os = myClient.getOutputStream();

InputStream is = myClient.getInputStream();

for (char a = 'a'; a <= 'z'; a++) {

os.write((int) a);

System.out.println("Gui" + a);

char b = (char) is.read();

System.out.println("Nhan" + b);

}

myClient.close();

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

}

package aptech.edu;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.ServerSocket;

import java.net.Socket;

public class TCPServer {

public static void main(String[] args) throws IOException{

try{

//Server mo socket cong 9000

ServerSocket myServer = new ServerSocket(9000);

System.out.println("Server started");

//Tao ra trang thai cho

Socket serverSocket = myServer.accept();

System.out.println("Connection from " + serverSocket);

//Socket co output stream

OutputStream os = serverSocket.getOutputStream();

InputStream is = serverSocket.getInputStream();

int ch = 0;

while(true){

ch = is.read();

if(ch == -1){

break;

}

os.write(ch);

System.out.println("Nhan: " + (char) ch);

}

myServer.close();

}catch(IOException e){

e.printStackTrace();

}

}

}