http服務端相對客戶端要簡單很多，我們仍舊使用libevent-2.1.5版本，服務端接口和2.0版本沒有區別

基本流程

http服務端使用到的借口函數及流程如下

創建event_base和evhttp

struct event_base *event_base_new(void); struct evhttp *evhttp_new(struct event_base *base);

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綁定地址和端口

int evhttp_bind_socket(struct evhttp *http, const char *address, ev_uint16_t port);

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設置處理函數

void evhttp_set_gencb(struct evhttp *http,void (*cb)(struct evhttp_request *, void *), void *arg);

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派發事件循環

int event_base_dispatch(struct event_base *);

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完整代碼

服務器接收到請求后打印URL，并返回一段文本信息

#include "event2/http.h" #include "event2/event.h" #include "event2/buffer.h"#include <stdlib.h> #include <stdio.h>void HttpGenericCallback(struct evhttp_request* request, void* arg) {const struct evhttp_uri* evhttp_uri = evhttp_request_get_evhttp_uri(request);char url[8192];evhttp_uri_join(const_cast<struct evhttp_uri*>(evhttp_uri), url, 8192);printf("accept request url:%s\n", url);struct evbuffer* evbuf = evbuffer_new();if (!evbuf){printf("create evbuffer failed!\n");return ;}evbuffer_add_printf(evbuf, "Server response. Your request url is %s", url);evhttp_send_reply(request, HTTP_OK, "OK", evbuf);evbuffer_free(evbuf); }int main(int argc, char** argv) {if (argc != 2){printf("usage:%s port\n", argv[0]);return 1;}int port = atoi(argv[1]);if (port == 0){printf("port error:%s\n", argv[1]);return 1;}struct event_base* base = event_base_new();if (!base){printf("create event_base failed!\n");return 1;}struct evhttp* http = evhttp_new(base);if (!http){printf("create evhttp failed!\n");return 1;}if (evhttp_bind_socket(http, "0.0.0.0", port) != 0){printf("bind socket failed! port:%d\n", port);return 1;}evhttp_set_gencb(http, HttpGenericCallback, NULL);event_base_dispatch(base);return 0; }

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編譯

g++ http-server.cpp -I/opt/third_party/libevent/include -L/opt/third_party/libevent/lib -levent -o http-server

總結

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