Socket communication example code analysis between Python and Java

Socket communication between Python and Java

I have made a Java communication tool before, which has basic functions such as sending messages and files. But everyone also knows that Java writing Whether it's AWT or Swing, the interface is simply not human-readable. It's okay for us developers. If it is a Release that is shown to users, it must be despised to the end. If you use C++, you have to write a lot of code (QT This is done very well!), but I switched to Python here so that wxPython can be used as the interface. And the two cross-platforms also do very well.

Only the core implementation and ideas are given here

　 Server(Java) receives files sent from Clinet(Python)

　JServer.java

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
 
public class JServer implements Runnable {
 
  ServerSocket ss;
 
  public JServer() throws Exception {
    ss = new ServerSocket(8086);
    new Thread(this).start();
  }
 
  @Override
  public void run() {
    int i = 0;
    System.out.println("server startup.");
    while (true) {
      try {
        Socket s = ss.accept();
        // 每个客户端一个处理线程
        new Handler(s, i).start();
        i++;
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
 
  }
 
  public static void main(String[] args) {
    try {
      new JServer();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
 
}
 
class Handler extends Thread {
  Socket s;
  int id;
 
  public Handler(Socket s, int id) {
    this.s = s;
    this.id = id;
  }
 
  @Override
  public void run() {
    System.out.println("in handling..");
 
    FileOutputStream fos = null;
    try {
      InputStream is = s.getInputStream();
      BufferedReader in = new BufferedReader(new InputStreamReader(is));
      // 从客户端读取发送过来的文件名
      String filename = in.readLine();
      System.out.println("read line " + id + " :" + filename);
      File file = new File(filename);
 
      int len = 0;
      int BUFSIZE = 4*1024;
      byte[] by = new byte[BUFSIZE * 1024];
      fos = new FileOutputStream(file);
      while ((len = is.read(by, 0, BUFSIZE)) != -1) {
        fos.write(by, 0, len);
        fos.flush();
      }
      System.out.println("done.");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      // 服务端就不要手贱 关了socket否则Python 会出现错误Errno 10054让客户端关掉就行啦
      try {
        fos.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
}

Python client

# -*- coding: utf-8 -*-
#!/usr/bin/python
#coding=utf-8
import time
import threading
import socket
import os
 
class Client():
  def __init__(self):
    address = ('127.0.0.1', 8086)
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect(address)
    fn = 'test.zip'
    ff = os.path.normcase(fn)
 
    try:
      f = open(fn, 'rb')
      sendFile = SendFile(s,f)
      sendFile.start()
      print 'start to send file.'
    except IOError:
      print 'open err'
 
 
class SendFile(threading.Thread):
  def __init__(self, sock, file):
    threading.Thread.__init__(self)
    self.file = file
    self.sock = sock
 
  def run(self):
    print self.file
    BUFSIZE = 1024
    count = 0
    name = self.file.name+'\r'
　　　　　　　　　# 前1k字节是为了给服务端发送文件名 一定要加上'\r',不然服务端就不能readline了
    for i in range(1, BUFSIZE - len(self.filename) -1):
      name += '?'
    print name
    self.sock.send(name)
    while True:
      print BUFSIZE
      fdata = self.file.read(BUFSIZE)
      if not fdata:
        print 'no data.'
        break
      self.sock.send(fdata)
      count += 1
      if len(fdata) != BUFSIZE:
        print 'count:'+str(count)
        print len(fdata)
      nRead = len(fdata)
 
    print 'send file finished.'
    self.file.close()
    self.sock.close()
    print 'close socket'
 
c = Client()

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