c_http_server/main.cpp

#include <event2/event.h>
#include <event2/listener.h>
#include <event2/http.h>
#include <event2/keyvalq_struct.h>
#include <event2/buffer.h>
#include <string.h>
#ifndef _WIN32
#include <signal.h>
#endif
#include <iostream>
#include <string>
using namespace std;

#define WEBROOT "." 
#define DEFAULTINDEX "index.html"

void http_cb(struct evhttp_request *request, void *arg)
{
	cout << "http_cb" << endl;
	//1 获取浏览器的请求信息
	//uri 
	const char *uri = evhttp_request_get_uri(request);
	cout << "uri:" << uri << endl;

	//请求类型 GET POST
	string cmdtype;
	switch (evhttp_request_get_command(request)) {
	case EVHTTP_REQ_GET:
		cmdtype = "GET";
		break;
	case EVHTTP_REQ_POST:
		cmdtype = "POST";
		break;
	}
	cout << "cmdtype:" << cmdtype << endl;

	// 消息报头
	evkeyvalq *headers = evhttp_request_get_input_headers(request);
	cout << "====== headers ======" << endl;
	for (evkeyval *p = headers->tqh_first; p != NULL; p = p->next.tqe_next) {
		cout << p->key << ":" << p->value << endl;
	}

	// 请求正文 (GET为空，POST有表单信息  )
	evbuffer *inbuf = evhttp_request_get_input_buffer(request);
	char buf[1024] = { 0 };
	cout << "======= Input data ======" << endl;
	while (evbuffer_get_length(inbuf)) {
		int n = evbuffer_remove(inbuf, buf, sizeof(buf) - 1);
		if (n > 0)
		{
			buf[n] = '\0';
			cout << buf << endl;
		}
	}

	//2 回复浏览器
	//状态行 消息报头 响应正文 HTTP_NOTFOUND HTTP_INTERNAL
	string filepath = WEBROOT;
	filepath += uri;
	if (strcmp(uri, "/") == 0)
	{
		//默认加入首页文件
		filepath += DEFAULTINDEX;
	}

	//消息报头
	evkeyvalq *outhead = evhttp_request_get_output_headers(request);
	//  要支持 图片 js css 下载zip文件
	//  获取文件的后缀
	// ./index.html
	int pos = filepath.rfind('.');
	string postfix = filepath.substr(pos + 1, filepath.size() - (pos + 1));
	if (postfix == "jpg" || postfix == "gif" || postfix == "png")
	{
		string tmp = "image/" + postfix;
		evhttp_add_header(outhead, "Content-Type", tmp.c_str());
	}
	else if (postfix == "zip")
	{
		evhttp_add_header(outhead, "Content-Type", "application/zip");
	}
	else if (postfix == "html")
	{
		evhttp_add_header(outhead, "Content-Type", "text/html;charset=UTF8");
		//evhttp_add_header(outhead, "Content-Type", "text/html");
	}
	else if (postfix == "css")
	{
		evhttp_add_header(outhead, "Content-Type", "text/css");
	}

	//读取html文件返回正文
    if(filepath.find_first_of("?")){
        
    }
    std::cout<<filepath.find_first_of("?")<<std::endl;

	FILE *fp = fopen(filepath.c_str(), "rb");
	if (!fp)
	{
		evhttp_send_reply(request, HTTP_NOTFOUND, "", 0);
		return;
	}
	evbuffer *outbuf = evhttp_request_get_output_buffer(request);
	for (;;)
	{
		int len = fread(buf, 1, sizeof(buf), fp);
		if (len <= 0)break;
		evbuffer_add(outbuf, buf, len);
	}
	fclose(fp);
	evhttp_send_reply(request, HTTP_OK, "", outbuf);
}

int main(int argc,char *argv[])
{
    
#ifdef _WIN32 
	//初始化socket库
	WSADATA wsa;
	WSAStartup(MAKEWORD(2,2),&wsa);
#else
	//忽略管道信号，发送数据给已关闭的socket
	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
		return 1;
#endif

	std::cout << "test server!\n"; 
	//创建libevent的上下文
	event_base * base = event_base_new();
	if (base)
	{
		cout << "event_base_new success!" << endl;
	}

	// http  服务器
	//1	创建evhttp上下文
	evhttp *evh = evhttp_new(base);

	//2  绑定端口和IP
	if (evhttp_bind_socket(evh, "0.0.0.0", 8080) != 0)
	{
		cout << "evhttp_bind_socket failed!" << endl;
	}

	//3   设定回调函数
	evhttp_set_gencb(evh, http_cb, 0);

	//事件分发处理
	if(base)
		event_base_dispatch(base);
	if(base)
		event_base_free(base);
	if(evh)
		evhttp_free(evh);

	return 0;
}