socket的通信问题

client:
 Socket sc = new Socket("127.0.0.1",6002);
  DataInputStream in =null;
  DataOutputStream out = null;
  in = new DataInputStream(sc.getInputStream());
  out = new DataOutputStream(sc.getOutputStream());
  out.writeUTF("FddFF");

server:
public void RemoteServer() throws Exception{
  RunJFrame runFrame = new RunJFrame();
  ServerSocket server = null;
  Socket you = null;
  DataInputStream in =null;
  
  
  server = new ServerSocket(6002);
  //DataOutputStream out = null;
  you = server.accept();
  in = new DataInputStream(you.getInputStream());
  //out = new DataOutputStream(you.getOutputStream());
  String ss = in.readUTF();
  System.out.println(ss);
 if(ss.equals("aa")){
  runFrame.setVisible(true);
 }   
     in.close();
  you.close();
  server.close();
 }