.Net Standard HttpClient封装Htt请求常用操作整理
一、常用Http操作
1.Get请求，有参数，无参数
2.Post 请求，有参数，无参数
3.文件简单下载
修改NetHelper中Post请求方法Bug：请求编码默认UTF8,字符串内存流读取后这是到开始位置。
/// <summary> /// Post 请求，无参(注：默认使用UTF8编码) /// </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.UTF8.GetBytes(content); ms.Write(bytes, 0, bytes.Length); ms.Seek(0, SeekOrigin.Begin);//设置指针读取位置，否则发送无效 HttpContent hc = new StreamContent(ms); HttpResponseMessage resp = await client.PostAsync(url, hc); return await resp.Content.ReadAsStringAsync(); } }
以前代码：
/// <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 }
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