Java client receives unexpedted data from Python server

Java client receives unexpedted data from Python server

Posted by: mabeljuhi on 25 October 2020, 3:57 pm EST

• 

  mabeljuhi

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  Posted 25 October 2020, 3:57 pm EST

  I was creating a python server with a java client, I manage to send the data from client to the server, however, when it is sent back, the value is not what I expect

  Python Server

  def handle_client(self, client): # Takes client socket as argument.
  
  “”“Handles a single client connection.”“”

  data = []
  
  # get size of data
  amt = client.recv(self.SIZE)
  amt = int.from_bytes(amt, byteorder="big", signed=True)
  
  
  client.send("True".encode())
  
  # get type of entre
  val = client.recv(self.SIZE)
  val = val.decode()
  val = val.split(", ")
  
  while amt > 0:
      data.append(val[len(val) - amt])
      amt -= 1
  
  if val[0] == "login":
      # check database
      u = User()
      check = u.login(val[1],val[2])
  
      if check:
          # add once login is confirmed
          self.clients[val[1]] = data
      else:
          b = "false"
          client.send(b.encode() + '\n')
  

  Java Client

  Socket s = new Socket();
  
  s.connect(new InetSocketAddress(voids[1], 7800), 2000);
  
  DataOutputStream dos = new DataOutputStream(this.s.getOutputStream());
  
  DataInputStream ois = new DataInputStream(this.s.getInputStream());
  
  sendPackets(this.al);
  
  b = ois.readByte();

  private void sendPackets(HashMap<String, Object> data) throws IOException, InterruptedException {
  
  if (data.containsKey(“Writer”)) {
  
  PrintWriter writer = (PrintWriter) data.get(“Writer”);
  
  data.remove(“Writer”);
  
  writer.write(data.size());
  
  writer.flush();
  
  } else if (data.containsKey(“ObjectStream”)) {
  
  DataOutputStream writer = (DataOutputStream)data.get(“ObjectStream”);
  
  data.remove(“ObjectStream”);
  
  DataInputStream reader = (DataInputStream)data.get(“InputStream”);
  
  data.remove(“InputStream”);
  
  writer.writeInt(data.size());
  
  writer.flush();

      String val = String.valueOf(data.get("type"));
  
      Byte buf = reader.readByte();
  
      if (data.containsKey("email")) {
          if (data.containsKey("type")) {
              val = val + ", ";
          }
          val = val + data.get("email");
      }
      if (data.containsKey("username")) {
          if (data.containsKey("email") || data.containsKey("type")) {
              val = val + ", ";
          }
          val = val + data.get("username");
      }
      if (data.containsKey("password")) {
          if (data.containsKey("username")) {
              val = val + ", ";
          }
          val = val + data.get("password");
      }
  
      writer.writeBytes(val);
  }
  

  }
  
  If any parts of the codes that are missing that is needed, please tell me

  When the string false is sent from Python to Java, the data received is 114. I do not think it is the value I sent from python as when I was debugging it, it receives 114 even when the python server has not sent the String yet

• 

  mohitg

  

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  Posted 26 October 2020, 2:06 pm EST

  Hello,

  This is not a general forum. Please ask only ActiveReports question here.

  Thanks,
  
  Mohit