.Net Standard HttpClient封装Htt请求常用操作整理

 ???/// <summary> ???/// http协议请求方法封装 ???/// </summary> ???public class NetHelper ???{ ???????#region Get请求 ???????/// <summary> ???????/// get请求,无参 ???????/// </summary> ???????/// <param name="url"></param> ???????/// <returns></returns> ???????public static async Task<string> GetAsync(string url) ???????{ ???????????HttpClient client = new HttpClient(); ???????????HttpResponseMessage resp = await client.GetAsync(url); ???????????//获取响应状态 ???????????//respMsg.StatusCode==200请求成功 ???????????//获取请求内容 ???????????HttpContent respContent = resp.Content; ???????????return await respContent.ReadAsStringAsync(); ???????} ???????/// <summary> ???????/// Get 请求，指定参数 ???????/// </summary> ???????/// <param name="url"></param> ???????/// <param name="dic"></param> ???????/// <returns></returns> ???????public static async Task<string> GetAsync(string url, Dictionary<string, string> dic) ???????{ ???????????//参数处理 ???????????StringBuilder builder = new StringBuilder(); ???????????builder.Append(url); ???????????if (dic.Count > 0) ???????????{ ???????????????builder.Append("?"); ???????????????int i = 0; ???????????????foreach (var item in dic) ???????????????{ ???????????????????if (i > 0) ???????????????????????builder.Append("&"); ???????????????????builder.AppendFormat("{0}={1}", item.Key, item.Value); ???????????????????i++; ???????????????} ???????????} ???????????return await GetAsync(builder.ToString()); ???????} ???????/// <summary> ???????/// get 请求 -同步处理 ???????/// </summary> ???????/// <param name="url"></param> ???????/// <returns></returns> ???????public static string Get(string url) ???????{ ???????????Task<string> result = GetAsync(url); ???????????result.Wait(); ???????????return result.Result; ???????} ???????/// <summary> ???????/// Get请求-同步处理 ???????/// </summary> ???????/// <param name="url">请求地址</param> ???????/// <param name="dic">请求参数</param> ???????/// <returns></returns> ???????public static string Get(string url, Dictionary<string, string> dic) ???????{ ???????????//参数处理 ???????????StringBuilder builder = new StringBuilder(); ???????????builder.Append(url); ???????????if (dic.Count > 0) ???????????{ ???????????????builder.Append("?"); ???????????????int i = 0; ???????????????foreach (var item in dic) ???????????????{ ???????????????????if (i > 0) ???????????????????????builder.Append("&"); ???????????????????builder.AppendFormat("{0}={1}", item.Key, item.Value); ???????????????????i++; ???????????????} ???????????} ???????????return Get(builder.ToString()); ???????} ???????#endregion ???????#region Post 请求处理 ???????/// <summary> ???????/// Post 请求，无参 ???????/// </summary> ???????/// <param name="url"></param> ???????/// <returns></returns> ???????public static async Task<string> PostAsync(string url, string content = "") ???????{ ???????????HttpClient client = new HttpClient(); ???????????using (MemoryStream ms = new MemoryStream()) ???????????{ ???????????????byte[] bytes = Encoding.Unicode.GetBytes(content); ???????????????ms.Write(bytes, 0, bytes.Length); ???????????????HttpContent hc = new StreamContent(ms); ???????????????HttpResponseMessage resp = await client.PostAsync(url, null); ???????????????return await resp.Content.ReadAsStringAsync(); ???????????} ???????} ???????/// <summary> ???????/// Post 请求，处理参数 ???????/// </summary> ???????/// <param name="url"></param> ???????/// <param name="dic"></param> ???????/// <returns></returns> ???????public static async Task<string> PostAsync(string url, Dictionary<string, string> dic) ???????{ ???????????HttpClient client = new HttpClient(); ???????????FormUrlEncodedContent data = new FormUrlEncodedContent(dic); ???????????var r = await client.PostAsync(url, data); ???????????return await r.Content.ReadAsStringAsync(); ???????????//client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/html")); ???????????//client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xhtml+xml")); ???????????//client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml", 0.9)); ???????????//client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("image/webp")); ???????????//client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("*/*", 0.8)); ???????????//hc.Headers.Add("UserAgent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36"); ???????????//hc.Headers.Add("Timeout", timeOut.ToString()); ???????????//hc.Headers.Add("KeepAlive", "true"); ???????} ???????/// <summary> ???????/// Post请求，同步，无参 ???????/// </summary> ???????/// <param name="url"></param> ???????/// <param name="content"></param> ???????/// <returns></returns> ???????public static string Post(string url, string content = "") ???????{ ???????????Task<string> str = PostAsync(url, content); ???????????str.Wait(); ???????????return str.Result; ???????} ???????/// <summary> ???????/// Post 请求，同步，参数处理 ???????/// </summary> ???????/// <param name="url"></param> ???????/// <param name="dic"></param> ???????/// <returns></returns> ???????public static string Post(string url, Dictionary<string, string> dic) ???????{ ???????????Task<string> str = PostAsync(url, dic); ???????????str.Wait(); ???????????return str.Result; ???????} ???????#endregion ???????#region 下载文件处理 ???????/// <summary> ???????/// 下载文件 ???????/// </summary> ???????/// <param name="url">链接地址</param> ???????/// <param name="target">存储地址</param> ???????/// <returns></returns> ???????public static bool DownLoad(string url, string target) ???????{ ???????????try ???????????{ ???????????????HttpClient client = new HttpClient(); ???????????????var t = client.GetByteArrayAsync(url); ???????????????t.Wait(); ???????????????var bytes = t.Result; ???????????????using (FileStream fs = new FileStream(target, FileMode.Create)) ???????????????{ ???????????????????fs.Write(bytes, 0, bytes.Length); ???????????????????fs.Close(); ???????????????} ???????????????return true; ???????????} ???????????catch (Exception ex) ???????????{ ???????????????throw new Exception("下载文件失败，", ex); ???????????} ???????} ???????#endregion ???}