Question

在python服务器上，我计划从java客户端接收参数，通过神经网络运行它们并将结果发回。消息将是numpy数组转换为字符串以进行通信过程。然而，我并没有那么远，试图从客户端传递一些虚拟字符串只是为了调用服务器例程，当我只是发回一个字符串时一切都很好。但是，当我调用mod.predict（arr）INSIDE循环或不将接收到的数据连接到回复时，服务器没有做出反应。有谁知道我怎么能做到这一点？

服务器 - 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()

客户端 - 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();

Answer 1

服务器代码：

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 from Python")
        conn.close()
    except:
        break

sock.close()

这是正确的，因为cURL这样说。

➜  ~  curl -v localhost:5000
* Rebuilt URL to: localhost:5000/
*   Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 5000 (#0)
> GET / HTTP/1.1
> Host: localhost:5000
> User-Agent: curl/7.43.0
> Accept: */*
> 
* Connection #0 to host localhost left intact
Hello world from Python%

哦，你的客户端代码也是错误的。您需要创建一个流式套接字，而不是数据报套接字（这就是您所拥有的）。

客户代码：

import java.net.*;
import java.io.*;

class Main
{
    public static void main(String args[]) throws Exception
    {
        // This constructor creates a 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();
    }
}

Answer 2

这就是服务器代码现在的样子。当我从命令行启动服务器然后从eclipse运行java-client时，所有表达式都在控制台中正确计算和打印。真正奇怪的是，当我传递一些字符串作为回复并且它似乎有效时，它可以在我在while循环中添加一些print参数时停止工作，如下面的代码中所示。

import socket
import sys
import pickle
import numpy as np

f=open('C:\\nn.pkl','rb')
mod=pickle.load(f)

HOST = 'localhost'
PORT = 5000
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print 'Socket created'
s.bind((HOST, PORT))
print 'Socket bind complete'
s.listen(10)
print 'Socket now listening'
while True:
   try:
       s.listen(10)
       conn, addr = s.accept()  
       data = conn.recv(1024)
       print data
       arr = np.array([1.0, 0.9712, 0.01019, 0.333, 0.01008, 0.5625, 0.75, 0.4, 0.25, 0.6, 0.0])
       pred = np.array_str(mod.predict(arr))
       print pred
       reply = "Answer.." + pred
       conn.send(reply)
       conn.close()
   except:
       break
s.close()

另外，当我在服务器运行时反复运行java客户端时，我有时会得到一个答案，而不是因为buff.ready（）在每次运行时都不是真的。

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

        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());
        }
}

服务器端的Python套接字问题

2 个答案: