C# 接口的Get、Post、WebService请求方法一览，值得收藏
public static class HttpHelper
{
const string DEFAULT_USER_AGENT = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 4.0.30319)";
const string DEFAULT_CONTENT_TYPE = "application/json"; #region Http Get Method
/// <summary>
/// GET请求
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static string Get(string url)
{
return Get(url, null);
} /// <summary>
/// GET请求，可以添加自定义的Header信息
/// </summary>
/// <returns></returns>
public static string Get(string url, IDictionary<string, string> headerList)
{
var request = (HttpWebRequest)WebRequest.Create(url);
request.UserAgent = DEFAULT_USER_AGENT;
request.ContentType = DEFAULT_CONTENT_TYPE;
if (headerList != null)
{
foreach (var header in headerList)
{
request.Headers.Add(header.Key, header.Value);
}
} var responseStream = request.GetResponse().GetResponseStream(); using (var reader = new StreamReader(responseStream))
{
var result = reader.ReadToEnd(); responseStream.Close(); return result;
}
}
#endregion /// <summary>
/// POST请求
/// </summary>
/// <param name="url"></param>
/// <param name="postData"></param>
/// <param name="contentType"></param>
/// <returns></returns>
public static string Post(string url, string postData, string contentType = DEFAULT_CONTENT_TYPE)
{
var webClient = new WebClient();
webClient.Headers.Add("user-agent", DEFAULT_USER_AGENT);
webClient.Headers.Add("Content-Type", contentType);
byte[] sendData = Encoding.UTF8.GetBytes(postData);
byte[] responseData = webClient.UploadData(url, "POST", sendData);
return Encoding.UTF8.GetString(responseData);
} /// <summary>
/// POST请求，并可以传入Header信息
/// </summary>
/// <param name="url"></param>
/// <param name="postData"></param>
/// <param name="headParams"></param>
/// <returns></returns>
public static string Post(string url, string postData, IDictionary<string, string> headParams)
{
var webClient = new WebClient();
webClient.Headers.Add("user-agent", DEFAULT_USER_AGENT);
webClient.Headers.Add("Content-Type", DEFAULT_CONTENT_TYPE);
if (headParams != null && headParams.Count > )
{
foreach (var item in headParams)
{
if (webClient.Headers.AllKeys.Contains(item.Key))
{
webClient.Headers.Remove(item.Key);
}
webClient.Headers.Add(item.Key, item.Value);
}
} byte[] sendData = Encoding.UTF8.GetBytes(postData);
byte[] responseData = webClient.UploadData(url, "POST", sendData);
return Encoding.UTF8.GetString(responseData);
} /// <summary>
/// HTTP Post请求，可以传入Header信息和超时限制
/// </summary>
/// <param name="url"></param>
/// <param name="content"></param>
/// <param name="headParams"></param>
/// <param name="timeout"></param>
/// <returns></returns>
public static string HttpPost(string url, string content,string ContentType, IDictionary<string, string> headParams,int timeout)
{
try
{
string result = string.Empty; HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "POST";
req.ContentType = ContentType;
if (headParams != null && headParams.Count > )
{
foreach (var item in headParams)
{
if (req.Headers.AllKeys.Contains(item.Key))
{
req.Headers.Remove(item.Key);
}
req.Headers.Add(item.Key, item.Value);
}
} byte[] data = Encoding.UTF8.GetBytes(content);
req.ContentLength = data.Length;
req.Timeout = timeout * ;
using (Stream reqStream = req.GetRequestStream())
{
reqStream.Write(data, , data.Length);
reqStream.Close();
} HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
Stream stream = resp.GetResponseStream();
//获取响应内容
using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
{
result = reader.ReadToEnd();
}
return result;
}
catch (Exception ex)
{
throw ex;
}
} /// <summary>
/// 需要WebService支持Get调用
/// </summary>
public static string WebServiceGet(String url, String methodname, Hashtable pars)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url + "/" + methodname + "?" + HashtableToPostData(pars));
request.Method = "GET";
request.ContentType = "application/x-www-form-urlencoded";
// 凭证
request.Credentials = CredentialCache.DefaultCredentials;
//超时时间
request.Timeout = ;
var response = request.GetResponse();
var stream = response.GetResponseStream();
StreamReader sr = new StreamReader(stream, Encoding.UTF8);
String retXml = sr.ReadToEnd();
sr.Close();
return retXml;
} /// <summary>
/// 需要WebService支持Post调用
/// </summary>
public static string PostWebServiceByJson(String url, String methodname, Hashtable pars)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url + "/" + methodname);
request.Method = "POST";
request.ContentType = "application/json;charset=utf-8";
request.Credentials = CredentialCache.DefaultCredentials;
request.Timeout = ;
byte[] data = Encoding.UTF8.GetBytes(HashtableToPostData(pars));
request.ContentLength = data.Length;
Stream writer = request.GetRequestStream();
writer.Write(data, , data.Length);
writer.Close(); StreamReader sr = new StreamReader(request.GetResponse().GetResponseStream(), Encoding.UTF8);
string retXml = sr.ReadToEnd();
sr.Close();
return retXml;
} /// <summary>
/// http Post调用 WebService
/// </summary>
public static XmlDocument QueryPostWebService(String URL,
String MethodName, Hashtable Pars) { HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URL + "/" + MethodName);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.Credentials = CredentialCache.DefaultCredentials;
request.Timeout = ;
#region 参数拼接成字符串，最后编码
StringBuilder sb = new StringBuilder();
foreach (string k in Pars.Keys) {
if (sb.Length > ) {
sb.Append("&");
}
sb.Append(
HttpUtility.UrlEncode(k) + "="
+ HttpUtility.UrlEncode(Pars[k].ToString())
);
}
byte[] data = Encoding.UTF8.GetBytes(sb.ToString());
#endregion
#region 把编码后的参数写入请求流中
request.ContentLength = data.Length;
Stream writer = request.GetRequestStream();
writer.Write(data, , data.Length);
writer.Close();
#endregion
#region 读取结果，创建XmlDocument对象，对象加载结果
var response = request.GetResponse();
StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
String retXml = sr.ReadToEnd();
sr.Close();
XmlDocument doc = new XmlDocument();
doc.LoadXml(retXml);
#endregion
return doc;
} private static String HashtableToPostData(Hashtable ht)
{
StringBuilder sb = new StringBuilder();
foreach (string k in ht.Keys)
{
if (sb.Length > )
{
sb.Append("&");
}
sb.Append(HttpUtility.UrlEncode(k) + "=" + HttpUtility.UrlEncode(ht[k].ToString()));
}
return sb.ToString();
} }