Python与Java间Socket通信实例代码分析

Python与Java间Socket通信

　　之前做过一款Java的通讯工具,有发消息发文件等基本功能.可大家也都知道Java写的界面无论是AWT或Swing,那简直不是人看的,对于我们这些开发人员还好,如果是Release出去给用户看,那必须被鄙视到底.用C++的话,写的代码也是非常多的(QT这方面做得很好!),但我这里改用Python,以便到时用wxPython做界面.而且这两者跨平台也做得非常好.

　　这里只给出核心实现以及思路

　　Server(Java)接收从Clinet(Python)发送来的文件

　　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客户端

# -*- 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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