Java client receives unexpedted data from Python server

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

  • 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
  • Replied 26 October 2020, 2:06 pm EST

    Hello,

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

    Thanks,
    Mohit
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