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：

/*
     File      : svr.cpp
     Author    : Mike
     E-Mail    : Mike_Zhang@live.com
*/

#include <iostream>
#include <boost/asio.hpp>

using boost::asio::ip::tcp;
enum {max_length = 1024};

typedef boost::shared_ptr<tcp::socket> socket_ptr;

int main()
{
    boost::asio::io_service io_service;
    tcp::acceptor a(io_service, tcp::endpoint(tcp::v4(), atoi("12345")));
    for (;;)
    {
        socket_ptr sock(new tcp::socket(io_service));
        a.accept(*sock);
        char data[max_length];
        boost::system::error_code error;
        size_t length = sock->read_some(boost::asio::buffer(data), error);
        data[length] = 0;
        std::cout<<data<<std::endl;
        sock->close();
    }
    return 0;
}

客户端代码：

/*
     File      : cli.cpp
     Author    : Mike
     E-Mail    : Mike_Zhang@live.com
*/
#include <iostream>
#include <boost/asio.hpp>

using boost::asio::ip::tcp;
enum { max_length = 1024 };

int main(int argc, char* argv[])
{
    boost::asio::io_service io_service;
    tcp::resolver resolver(io_service);
    tcp::resolver::query query(tcp::v4(), "127.0.0.1","12345");
    tcp::resolver::iterator iterator = resolver.resolve(query);

    tcp::socket s(io_service);
    s.connect(*iterator);

    std::cout << "Please input: ";
    char request[max_length];
    std::cin.getline(request, max_length);
    size_t request_length = strlen(request);
    boost::asio::write(s, boost::asio::buffer(request, request_length));
    return 0;
}

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

二、python实现

服务端代码：

'''
     File      : svr.py
     Author    : Mike
     E-Mail    : Mike_Zhang@live.com
'''
import socket,os
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
sock.bind(('127.0.0.1', 12345))  
sock.listen(5)  
while True:  
    connection,address = sock.accept()  
    buf = connection.recv(1024)  
    print buf            
    connection.close()  

客户端代码：

'''
     File      : cli.py
     Author    : Mike
     E-Mail    : Mike_Zhang@live.com
'''
import socket  
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
sock.connect(('127.0.0.1', 12345))  
#sock.send('Test\n')  
sock.send(raw_input("Please input : "))  
sock.close()  

三、go语言实现

服务端代码：

/*
     File      : svr.go
     Author    : Mike
     E-Mail    : Mike_Zhang@live.com
*/
package main

import(
    "net"
    "fmt"
    "bufio"
)

func main() {
    client,err := net.Listen("tcp","127.0.0.1:12345")
    if err != nil {
        fmt.Printf("Error : %s\n",err.String())
    }
    for {
        if c, err := client.Accept(); err == nil { 
            defer c.Close()
            line, _ := bufio.NewReader(c).ReadString('\n')
            fmt.Println(line) 
        }
    }
}

客户端代码：

/*
     File      : cli.go
     Author    : Mike
     E-Mail    : Mike_Zhang@live.com
*/
package main

import(
    "net"
    "fmt"
)

func main() {
    conn, err := net.Dial("tcp", "127.0.0.1:12345")
    if err != nil {
        fmt.Printf("Error : %s\n",err.String())
    }
    conn.Write([]byte("Just a test"))     
}

运行效果（go语言为例）：

好，就这些了，希望对你有帮助。