.Net Standard HttpClient封装Htt请求常用操作整理

/// <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, , bytes.Length);
ms.Seek(, 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();
}
}

/// <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 > )
{
builder.Append("?");
int i = ;
foreach (var item in dic)
{
if (i > )
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 > )
{
builder.Append("?");
int i = ;
foreach (var item in dic)
{
if (i > )
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, , 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, , bytes.Length);
fs.Close();
}
return true;
}
catch (Exception ex)
{
throw new Exception("下载文件失败，", ex);
}
}
#endregion
}