DLib Http Server程序示例

/*

    這個示例是一個使用了Dlib C++ 庫的server組件的HTTP擴展

    它建立一個始終以簡單的HTML表單爲響應的服務器。
    要查看這個頁面,你應該訪問 http://localhost:5000

*/

#include <iostream>
#include <sstream>
#include <string>
#include <dlib/server.h>

using namespace dlib;
using namespace std;

class web_server : public server_http
{
    const std::string on_request (
        const incoming_things& incoming,
        outgoing_things& outgoing
    )
    {
        ostringstream sout;
        // 咱們將發回一個包含HTML表單的頁面,其中包含兩個文本輸入字段。一個字段是name(還有一個是pass)
        // HTML表單使用post方法,也能夠使用get方法(只需將method='post'改成method='get').

        sout <<" <html><meta charset=\"utf-8\"><body> "
            << "<form action='/form_handler' method='post'> "
            << "用戶名稱: <input name='user' type='text'><br>  "
            << "用戶密碼: <input name='pass' type='text'> <input type='submit'> "
            << " </form>";

        // 回寫這個請求傳入的一些信息,以便它們顯示在生成的網頁上
        sout << "<br>  path = "         << incoming.path << endl;
        sout << "<br>  request_type = " << incoming.request_type << endl;
        sout << "<br>  content_type = " << incoming.content_type << endl;
        sout << "<br>  protocol = "     << incoming.protocol << endl;
        sout << "<br>  foreign_ip = "   << incoming.foreign_ip << endl;
        sout << "<br>  foreign_port = " << incoming.foreign_port << endl;
        sout << "<br>  local_ip = "     << incoming.local_ip << endl;
        sout << "<br>  local_port = "   << incoming.local_port << endl;
        sout << "<br>  body = \""       << incoming.body << "\"" << endl;


        // 若是此請求是用戶提交表單的結果,則回顯提交
        if (incoming.path == "/form_handler")
        {
            sout << "<h2> 來自 query string 的信息 </h2>" << endl;
            sout << "<br>  user = " << incoming.queries["user"] << endl;
            sout << "<br>  pass = " << incoming.queries["pass"] << endl;

            // 將這些表單提交做爲Cookie保存
            outgoing.cookies["user"] = incoming.queries["user"];
            outgoing.cookies["pass"] = incoming.queries["pass"];
        }


        // 將全部Cookie回傳到客戶端瀏覽器
        sout << "<h2>客戶web瀏覽器發送給服務器的 Cookies</h2>";
        for ( key_value_map::const_iterator ci = incoming.cookies.begin(); ci != incoming.cookies.end(); ++ci )
        {
            sout << "<br/>" << ci->first << " = " << ci->second << endl;
        }

        sout << "<br/><br/>";

        sout << "<h2>客戶web瀏覽器發送給服務器的 HTTP Headers</h2>";
        // 回顯從客戶端web瀏覽器接收的全部HTTP headers
        for ( key_value_map_ci::const_iterator ci = incoming.headers.begin(); ci != incoming.headers.end(); ++ci )
        {
            sout << "<br/>" << ci->first << ": " << ci->second << endl;
        }

        sout << "</body> </html>";

        return sout.str();
    }

};

int main()
{
    try
    {
        // 建立一個 web server 實例對象
        web_server our_web_server;

        // 監聽5000端口
        our_web_server.set_listening_port(5000);
        // 告訴服務器開始接受鏈接。
        our_web_server.start_async();

        cout << "請按Enter(回車)鍵去結束程序" << endl;
        cin.get();
    }
    catch (exception& e)
    {
        // 上面出錯會拋出異常
        // 輸出異常消息
        cout << e.what() << endl;
    }
}
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