java - Python socket problems on server side -

on python server plan receive parameters java client, run them through neural network , send result back. messages numpy arrays converted strings communication process. i'am not far yet trying pass dummy string client envoke server routine , fine when send string back. when call mod.predict(arr) inside loop or not concatenate received data reply, server doesn't react. have idea how done?

server - python:

host = 'localhost' port = 7777 s = socket.socket(socket.af_inet, socket.sock_stream) s.bind((host, port)) s.listen(10)  while true:    conn, addr = s.accept()      data = conn.recv(1024)+"\r\n"     pred = mod.predict(arr)     reply = 'answer..' + pred + data      # +'\r\n'     if not data:        break     conn.send(reply)  conn.close() 

client - java:

socket socket = new socket("localhost", 7777); outputstream out = socket.getoutputstream(); printstream ps = new printstream(out, true); ps.println("hello python!");  inputstream in = socket.getinputstream(); bufferedreader buff = new bufferedreader(new inputstreamreader(in));  while (buff.ready()) {     system.out.println(buff.readline()); }  socket.close(); 

server code:

import socket  sock = socket.socket(socket.af_inet,                       socket.sock_stream) sock.bind(("localhost", 5000)) sock.listen()  while true:     try:         sock.listen()         conn, addr = sock.accept()         print(conn.recv(1024))         conn.send(b"hello world python")         conn.close()     except:         break  sock.close() 

this correct, because curl says so.

➜  ~  curl -v localhost:5000 * rebuilt url to: localhost:5000/ *   trying 127.0.0.1... * connected localhost (127.0.0.1) port 5000 (#0) > / http/1.1 > host: localhost:5000 > user-agent: curl/7.43.0 > accept: */* >  * connection #0 host localhost left intact hello world python% 

oh, , client code wrong well. need create streaming socket, not datagram socket (which have).

client code:

import java.net.*; import java.io.*;  class main {     public static void main(string args[]) throws exception     {         // constructor creates streaming socket         socket socket = new socket(inetaddress.getbyname(null), 5000);         outputstream out = socket.getoutputstream();         printstream ps = new printstream(out, true);         ps.println("hello python!");          inputstream in = socket.getinputstream();         bufferedreader buff = new bufferedreader(new inputstreamreader(in));          while (buff.ready()) {             system.out.println(buff.readline());         }          socket.close();     } }