public static void main(String[] args) throws IOException, ParseException {
                ServerSocket serverSocket = new ServerSocket(10001);
                while(true) {
                        try {
                                socket = serverSocket.accept();
                                dos = new DataOutputStream(socket.getOutputStream());    
                                dis = new DataInputStream(socket.getInputStream());
                                while (true) {
                                        System.out.println("Server wait client");
                                        String buff = dis.readUTF();
                                        JSONParser parser = new JSONParser();
                                        Object obj = parser.parse(buff);
                                        JSONObject decode = (JSONObject) obj;
                                        System.out.println(decode.get("tx1"));
                                        System.out.println(decode.get("tx2"));
                                        System.out.println(decode.get("tx3"));
                                        System.out.println(decode.get("tx4"));

                                }
                        }catch (Exception e){
                                if(socket.isConnected()){
                                        socket.close();
                                }
                                continue;
                        }finally {
                                if(socket.isConnected()){
                                        socket.close();
                                }
                        }
                        }

        }
 

 public static void fun(int port) throws IOException {
        socket = new Socket("localhost", port);                //create  socket   fd
        dos = new DataOutputStream(socket.getOutputStream());    //create  dos     recv
        dis = new DataInputStream(socket.getInputStream());       // create dis

        JSONObject obj = new JSONObject();
        //JSONValue.toJSONString(obj);
        obj.put("tx1","aaa");
        obj.put("tx2","bbb");
        obj.put("tx3","ccc");
        obj.put("tx4","ddd");
        String buf = obj.toJSONString();
        dos.writeUTF(buf);
        dos.close();
        dis.close();
        socket.close();

    }

    public static void main(String[] args) throws IOException {
            fun(10001);

    }