net core后台访问外部web api

liangyely

已于 2023-06-26 18:44:29 修改

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分类专栏： c# 文章标签： .netcore

于 2023-06-26 00:12:55 首次发布

本文链接：https://blog.youkuaiyun.com/liangyely/article/details/131388273

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 private async Task<string> HttpPost(string url, Dictionary<string, string> parameters, CookieContainer cookieContainer)
        {
            HttpClientHandler handler = new HttpClientHandler();
            handler.CookieContainer = cookieContainer;
            HttpClient client = new HttpClient(handler);
            HttpContent content = new FormUrlEncodedContent(parameters);
            HttpResponseMessage response = await client.PostAsync(url, content);
            response.EnsureSuccessStatusCode();

            // 保存响应中的Cookie信息
            IEnumerable<string> cookieHeaders;
            if (response.Headers.TryGetValues("Set-Cookie", out cookieHeaders))
            {
                foreach (string cookieHeader in cookieHeaders)
                {
                    cookieContainer.SetCookies(new Uri(url), cookieHeader);
                }
            }

            string responseBody = await response.Content.ReadAsStringAsync();
            return responseBody;
        }
        public async Task<string> HttpGet(string url, Dictionary<string, string> parameters, CookieContainer cookieContainer)
        {
            HttpClientHandler handler = new HttpClientHandler();
            handler.CookieContainer = cookieContainer;
            HttpClient client = new HttpClient(handler);

            // 构建查询字符串
            string queryString = string.Join("&", parameters.Select(p => $"{Uri.EscapeDataString(p.Key)}={Uri.EscapeDataString(p.Value)}"));
            string urlWithQuery = $"{url}?{queryString}";

            HttpResponseMessage response = await client.GetAsync(urlWithQuery);
            response.EnsureSuccessStatusCode();

            // 保存响应中的Cookie信息
            IEnumerable<string> cookieHeaders;
            if (response.Headers.TryGetValues("Set-Cookie", out cookieHeaders))
            {
                foreach (string cookieHeader in cookieHeaders)
                {
                    cookieContainer.SetCookies(new Uri(url), cookieHeader);
                }
            }

            string responseBody = await response.Content.ReadAsStringAsync();
            return responseBody;
        }

应用：

CookieContainer cookieContainer = new CookieContainer();

// 创建一个新的Cookie对象
Cookie cookie = new Cookie("cookie_name", "cookie_value");
cookie.Domain = "example.com"; // 设置cookie的域名

// 将Cookie对象添加到CookieContainer中
cookieContainer.Add(cookie);

Dictionary<string, string> parameters = new Dictionary<string, string>()
{
    { "key1", "value1" },
    { "key2", "value2" }
};
string url = "https://example.com";
string response = await HttpGet(url, parameters, cookieContainer);