what is the right way inTCP Client/Server to send and recive data in java

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Java

TCP/IP

hi every body.
i pass one day to do it but why it isn't working i don't know .i used Scanner and PrintWriter class to send and get data . i want just create a simple corresponding between a client and a server .in a loop client send a text to server and server answer to him "your message received" but server waiting in input.nextLine() for client though i send a content in client to server .
server code:

import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;


public class SimpleServer {
	private static ServerSocket server;
	private static int port=3234;
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try{
			server=new ServerSocket(port);
		}
		catch(IOException ioEx)
		{
			System.out.println(
			"Unable to attach to port!");
			System.exit(1);
		}
		do{
			handle();
		}while(true);
	}
	private static void handle(){
		Socket link= null;
		System.out.println("waiting for a client ...");
		try{
			link= server.accept();
			System.out.println("client accepted.");
			Scanner input=new Scanner(link.getInputStream());
			PrintWriter output= new PrintWriter(link.getOutputStream(),true);
			String message=null;
			output.println("i found you");
			System.out.println("waiting for client response ...");
			message = input.nextLine();
			System.out.println("message recived");
			while(!message.equals("CLS") ){
				System.out.println("client> "+ message);
				output.println("your message recived :"+message);
				message=input.nextLine();
			}
		}
		catch(IOException ioEx)
		{
			ioEx.printStackTrace();
		}
		finally
		{
			try
			{
				System.out.println(
				"\n* Closing connection… *");
				link.close(); //Step 5.
			}
			catch(IOException ioEx)
			{
				System.out.println(
				"Unable to disconnect!");
				System.exit(1);
			}
		}
		
	}

}

client Code:

import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;


public class SimpleClient {
	private static InetAddress host;
	private static  int port = 3234;
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try
		{
			host = InetAddress.getLocalHost();
		}
		catch(UnknownHostException uhEx)
		{
			System.out.println("Host ID not found!");
			System.exit(1);
		}
		Socket link=null;
		try{
			link=new Socket(host,port);
			Scanner input=new Scanner(link.getInputStream());
			Scanner userInput=new Scanner(System.in);
			PrintWriter output=new PrintWriter(link.getOutputStream());
			String message=null,clientMessage=null;
			output.println("hi server");
			
			do{
				System.out.print("Enter message: ");
				clientMessage=userInput.nextLine();
				System.out.println("client> "+clientMessage);
				output.println(clientMessage);
				System.out.println("Waiting for server ....");
				message=input.nextLine();
				System.out.println("server> "+message);
				
			}while(!message.equals("CLS"));
			
		}
		catch(IOException io){
			System.out.println("server not founded");
		}
	}

}

pleas say me why it isn't work ??