using System;
using System.IO;
using System.Net;
using System.Text;
using System.Web;
using System.Collections.Generic;
using System.CodeDom.Compiler;
using System.Web.Services.Description;
using System.CodeDom;
using Microsoft.CSharp;
/*********************
* 描述：提供http、POST和GET、Webservices动态访问远程接口* *******************/
namespace Demo
{public static class HttpHelper{///  /// 有关HTTP请求的辅助类/// private static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";//浏览器 private static Encoding requestEncoding = System.Text.Encoding.UTF8;//字符集 #region 创建GET方式的HTTP请求////// 创建GET方式的HTTP请求   ////// 接口URL/// 接口URL的参数/// 调用接口返回的信息///public static bool HttpGet(string url, Dictionary dctParam, out string HttpWebResponseString){if (string.IsNullOrEmpty(url)){throw new ArgumentNullException("url");}HttpWebResponseString = "";HttpWebRequest request = null;Stream stream = null;//用于传参数的流 HttpWebResponse httpWebResponse = null;try{int i = 0;StringBuilder buffer = new StringBuilder();if (!(dctParam == null)){foreach (string key in dctParam.Keys){if (i > 0){buffer.AppendFormat("&{0}={1}", key, (dctParam[key]));}else{buffer.AppendFormat("{0}={1}", key, (dctParam[key]));}i++;}url = url + "?" + buffer.ToString();}request = WebRequest.Create(url) as HttpWebRequest;request.Method = "GET";//传输方式  request.ContentType = "application/x-www-form-urlencoded";//协议request.UserAgent = DefaultUserAgent;//请求的客户端浏览器信息,默认IE request.Timeout = 6000;//超时时间，写死6秒request.KeepAlive = false;//DefaultConnectionLimit是默认的2，而当前的Http的connection用完了，导致后续的GetResponse或GetRequestStream超时死掉System.Net.ServicePointManager.DefaultConnectionLimit = 50;request.ServicePoint.Expect100Continue = false;httpWebResponse = request.GetResponse() as HttpWebResponse;HttpWebResponseString = ReadHttpWebResponse(httpWebResponse);return true;}catch (Exception ee){HttpWebResponseString = ee.ToString();return false;}finally{if (stream != null){stream.Close();}if (request != null){                    request.Abort();request = null;}if (httpWebResponse != null){httpWebResponse.Close();httpWebResponse = null;}}}      #endregion#region 创建POST方式的HTTP请求////// 创建POST方式的HTTP请求   ////// 接口URL/// 接口URL的参数/// 调用接口返回的信息///public static bool HttpPost(string url, Dictionary dctParam, out string HttpWebResponseString){if (string.IsNullOrEmpty(url)){throw new ArgumentNullException("url");}HttpWebResponseString = "";HttpWebRequest request = null;Stream stream = null;//用于传参数的流
try{url = EncodePostData(url);request = WebRequest.Create(url) as HttpWebRequest;request.Method = "POST";//传输方式 request.ContentType = "application/x-www-form-urlencoded";//协议request.UserAgent = DefaultUserAgent;//请求的客户端浏览器信息,默认IE  request.Timeout = 6000;//超时时间，写死6秒//DefaultConnectionLimit是默认的2，而当前的Http的connection用完了，导致后续的GetResponse或GetRequestStream超时死掉System.Net.ServicePointManager.DefaultConnectionLimit = 50;request.ServicePoint.Expect100Continue = false;//如果需求POST传数据，转换成utf-8编码byte[] Data = ParamDataConvert(dctParam);if (!(Data == null)){string s = requestEncoding.GetString(Data);stream = request.GetRequestStream();stream.Write(Data, 0, Data.Length);}HttpWebResponse HttpWebResponse = request.GetResponse() as HttpWebResponse;HttpWebResponseString = ReadHttpWebResponse(HttpWebResponse);return true;}catch (Exception ee){HttpWebResponseString = ee.ToString();return false;}finally{if (stream != null){stream.Close();}}}#endregion#region 反射动态调用WebServices////// 反射动态调用WebServices////// Webservices地址，以?WSDL结尾/// 调用的方法/// 调用方法的参数///public static object InvokeWebService(string url, string methodname, object[] args){string @namespace = "Demo";//本页的命名空间try{//获取WSDLWebClient wc = new WebClient();Stream stream = wc.OpenRead(url);ServiceDescription sd = ServiceDescription.Read(stream);ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();sdi.AddServiceDescription(sd, "", "");CodeNamespace cn = new CodeNamespace(@namespace);//生成客户端代理类代码CodeCompileUnit ccu = new CodeCompileUnit();ccu.Namespaces.Add(cn);sdi.Import(cn, ccu);CSharpCodeProvider csc = new CSharpCodeProvider();CSharpCodeProvider icc = new CSharpCodeProvider();//设定编译参数CompilerParameters cplist = new CompilerParameters();cplist.GenerateExecutable = false;cplist.GenerateInMemory = true;cplist.ReferencedAssemblies.Add("System.dll");cplist.ReferencedAssemblies.Add("System.XML.dll");cplist.ReferencedAssemblies.Add("System.Web.Services.dll");cplist.ReferencedAssemblies.Add("System.Data.dll");//编译代理类CompilerResults cr = icc.CompileAssemblyFromDom(cplist, ccu);if (true == cr.Errors.HasErrors){System.Text.StringBuilder sb = new System.Text.StringBuilder();foreach (System.CodeDom.Compiler.CompilerError ce in cr.Errors){sb.Append(ce.ToString());sb.Append(System.Environment.NewLine);}throw new Exception(sb.ToString());}//生成代理实例，并调用方法System.Reflection.Assembly assembly = cr.CompiledAssembly;Type[] types = assembly.GetTypes();Type t = types[0];object obj = Activator.CreateInstance(t);System.Reflection.MethodInfo mi = t.GetMethod(methodname);return mi.Invoke(obj, args);}catch (Exception ex){}return null;}#endregion////// 接口参数转换////// 接口参数集合包///private static byte[] ParamDataConvert(Dictionary dctParam){if (dctParam == null) return null;try{Encoding requestEncoding = System.Text.Encoding.UTF8;//字符集StringBuilder buffer = new StringBuilder();int i = 0;foreach (string key in dctParam.Keys){if (i > 0){buffer.AppendFormat("&{0}={1}", key, (dctParam[key]));}else{buffer.AppendFormat("{0}={1}", key, (dctParam[key]));}i++;}string PostData = buffer.ToString();byte[] data = requestEncoding.GetBytes(buffer.ToString());return data;}catch (Exception ex){}return null;}///  /// 获取数据 ///  /// 响应对象 /// </returns> public static string ReadHttpWebResponse(HttpWebResponse HttpWebResponse){Stream responseStream = null;StreamReader sReader = null;String value = null;try{// 获取响应流 responseStream = HttpWebResponse.GetResponseStream();// 对接响应流(以"utf-8"字符集) sReader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8"));// 开始读取数据 value = sReader.ReadToEnd();}catch (Exception ee){throw ee;}finally{//强制关闭 if (sReader != null){sReader.Close();}if (responseStream != null){responseStream.Close();}if (HttpWebResponse != null){HttpWebResponse.Close();}}return value;}public static string EncodePostData(string Data){string EncodeData = HttpUtility.UrlDecode(Data);return EncodeData;}}
}