socket programming multiple client to one server

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public class ThreadedEchoServer {    static final int PORT = 1978;    public static void main(String args[]) {        ServerSocket serverSocket = null;        Socket socket = null;        try {            serverSocket = new ServerSocket(PORT);        } catch (IOException e) {            e.printStackTrace();        }        while (true) {            try {                socket = serverSocket.accept();            } catch (IOException e) {                System.out.println("I/O error: " + e);            }            // new threa for a client            new EchoThread(socket).start();        }    }}

public class EchoThread extends Thread {    protected Socket socket;    public EchoThread(Socket clientSocket) {        this.socket = clientSocket;    }    public void run() {        InputStream inp = null;        BufferedReader brinp = null;        DataOutputStream out = null;        try {            inp = socket.getInputStream();            brinp = new BufferedReader(new InputStreamReader(inp));            out = new DataOutputStream(socket.getOutputStream());        } catch (IOException e) {            return;        }        String line;        while (true) {            try {                line = brinp.readLine();                if ((line == null) || line.equalsIgnoreCase("QUIT")) {                    socket.close();                    return;                } else {                    out.writeBytes(line + "\n\r");                    out.flush();                }            } catch (IOException e) {                e.printStackTrace();                return;            }        }    }}

Client

// A simple Client Server Protocol .. Client for Echo Serverimport java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.InetAddress;import java.net.Socket;public class NetworkClient {public static void main(String args[]) throws IOException{    InetAddress address=InetAddress.getLocalHost();    Socket s1=null;    String line=null;    BufferedReader br=null;    BufferedReader is=null;    PrintWriter os=null;    try {        s1=new Socket(address, 4445); // You can use static final constant PORT_NUM        br= new BufferedReader(new InputStreamReader(System.in));        is=new BufferedReader(new InputStreamReader(s1.getInputStream()));        os= new PrintWriter(s1.getOutputStream());    }    catch (IOException e){        e.printStackTrace();        System.err.print("IO Exception");    }    System.out.println("Client Address : "+address);    System.out.println("Enter Data to echo Server ( Enter QUIT to end):");    String response=null;    try{        line=br.readLine();         while(line.compareTo("QUIT")!=0){                os.println(line);                os.flush();                response=is.readLine();                System.out.println("Server Response : "+response);                line=br.readLine();            }    }    catch(IOException e){        e.printStackTrace();    System.out.println("Socket read Error");    }    finally{        is.close();os.close();br.close();s1.close();                System.out.println("Connection Closed");    }}}

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