简单客户端服务器模型（C++、python和go语言示例）

工作中用到了C/S模型，所做的也无非是给服务器发数据，但开发阶段会遇到程序自身的回环测试，需要用到简单的服务端以便验证数据发送的正确性。

写软件用C++，跑测试用python，这段时间也刚好看go语言，所以都要有demo。以下三组程序实现的功能相同，这里一起做下总结。

一、C++实现

Boost.Asio是一个跨平台的C++库，它用现代C++方法为网络和底层I/O程序提供了一致的异步I/O模型。为了跨平台，我用boost库实现，具体如下。

服务端代码：

 1 /*
 2      File      : svr.cpp
 3      Author    : Mike
 4      E-Mail    : Mike_Zhang@live.com
 5 */
 6 
 7 #include <iostream>
 8 #include <boost/asio.hpp>
 9 
10 using boost::asio::ip::tcp;
11 enum {max_length = 1024};
12 
13 typedef boost::shared_ptr<tcp::socket> socket_ptr;
14 
15 int main()
16 {
17     boost::asio::io_service io_service;
18     tcp::acceptor a(io_service, tcp::endpoint(tcp::v4(), atoi("12345")));
19     for (;;)
20     {
21         socket_ptr sock(new tcp::socket(io_service));
22         a.accept(*sock);
23         char data[max_length];
24         boost::system::error_code error;
25         size_t length = sock->read_some(boost::asio::buffer(data), error);
26         data[length] = 0;
27         std::cout<<data<<std::endl;
28         sock->close();
29     }
30     return 0;
31 }

客户端代码：

 1 /*
 2      File      : cli.cpp
 3      Author    : Mike
 4      E-Mail    : Mike_Zhang@live.com
 5 */
 6 #include <iostream>
 7 #include <boost/asio.hpp>
 8 
 9 using boost::asio::ip::tcp;
10 enum { max_length = 1024 };
11 
12 int main(int argc, char* argv[])
13 {
14     boost::asio::io_service io_service;
15     tcp::resolver resolver(io_service);
16     tcp::resolver::query query(tcp::v4(), "127.0.0.1","12345");
17     tcp::resolver::iterator iterator = resolver.resolve(query);
18 
19     tcp::socket s(io_service);
20     s.connect(*iterator);
21 
22     std::cout << "Please input: ";
23     char request[max_length];
24     std::cin.getline(request, max_length);
25     size_t request_length = strlen(request);
26     boost::asio::write(s, boost::asio::buffer(request, request_length));
27     return 0;
28 }

编译：g++ cli.cpp -o cli -lboost_system -lboost_thread-mt

二、python实现

服务端代码：

 1 '''
 2      File      : svr.py
 3      Author    : Mike
 4      E-Mail    : Mike_Zhang@live.com
 5 '''
 6 import socket,os
 7 sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
 8 sock.bind(('127.0.0.1', 12345))  
 9 sock.listen(5)  
10 while True:  
11     connection,address = sock.accept()  
12     buf = connection.recv(1024)  
13     print buf            
14     connection.close()

客户端代码：

 1 '''
 2      File      : cli.py
 3      Author    : Mike
 4      E-Mail    : Mike_Zhang@live.com
 5 '''
 6 import socket  
 7 sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
 8 sock.connect(('127.0.0.1', 12345))  
 9 #sock.send('Test\n')  
10 sock.send(raw_input("Please input : "))  
11 sock.close()

三、go语言实现

服务端代码：

 1 /*
 2      File      : svr.go
 3      Author    : Mike
 4      E-Mail    : Mike_Zhang@live.com
 5 */
 6 package main
 7 
 8 import(
 9     "net"
10     "fmt"
11     "bufio"
12 )
13 
14 func main() {
15     client,err := net.Listen("tcp","127.0.0.1:12345")
16     if err != nil {
17         fmt.Printf("Error : %s\n",err.String())
18     }
19     for {
20         if c, err := client.Accept(); err == nil { 
21             defer c.Close()
22             line, _ := bufio.NewReader(c).ReadString('\n')
23             fmt.Println(line) 
24         }
25     }
26 }

客户端代码：

 1 /*
 2      File      : cli.go
 3      Author    : Mike
 4      E-Mail    : Mike_Zhang@live.com
 5 */
 6 package main
 7 
 8 import(
 9     "net"
10     "fmt"
11 )
12 
13 func main() {
14     conn, err := net.Dial("tcp", "127.0.0.1:12345")
15     if err != nil {
16         fmt.Printf("Error : %s\n",err.String())
17     }
18     conn.Write([]byte("Just a test"))     
19 }

运行效果（go语言为例）：

好，就这些了，希望对你有帮助。