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package network;import java.io.DataInputStream;import java.net.*;public class Tcpserver {    public static void main(String[] args) throws Exception{        // TODO Auto-generated method stub        ServerSocket ss=new ServerSocket(8002);        while(true)        {            Socket s=ss.accept();            System.out.println("A client connect");            DataInputStream dis = new DataInputStream(s.getInputStream());            System.out.println(dis.readUTF());            dis.close();            s.close();        }    }}package network;import java.io.DataOutputStream;import java.io.OutputStream;import java.net.*;import java.rmi.server.SocketSecurityException;public class TCPclient {    public static void main(String[] args) throws Exception {        // TODO Auto-generated method stub        Socket s =new Socket("127.0.0.1",8002);        OutputStream os =s.getOutputStream();        DataOutputStream dos=new DataOutputStream(os);        dos.writeUTF("hello world");        dos.flush();        dos.close();        s.close();    }}