简要介绍一:WebProxy :即HTTP 代理设置。
官方解释:WebProxy 类包含 WebRequest 实例用以确定是否使用 Web 代理发送请求的代理设置。 可以在计算机和应用程序配置文件中指定全局 Web 代理设置,并且应用程序可用 WebProxy 类的实例自定义 Web 代理的用途。
个人理解:即将代理IP、Port进行封装,并设置代理IP的用户名及密码,通过该用户名和密码登陆登陆代理主机并进行相关访问。
简要介绍二:HttpWebClientProtocol:所有使用 HTTP 传输协议的 xm l Web services 客户端代理的基类。
在调用易行接口时,会动态编译源码,将编译后创建的实例强制转换成HttpWebClientProtocol类型,并在HttpWebClientProtocol中附上proxy类型,即可使用代理IP进行访问。
简要介绍三:在HttpWebRequest、WebClien、HttpWebClientProtocol都可以使用代理IP。
一: HttpWebRequest:已Http形式抓取网页,仅需在发起http前给request加上proxy属性即可,如下面使用代理IP抓取百度首页:
HttpWebRequest httpRequest = (HttpWebRequest)HttpWebRequest.Create(
httpRequest.Method = GET
httpRequest.Credentials = CredentialCache.DefaultCredentials;
// 设置代理属性WebProxy -------------------------------------------------
WebProxy proxy = new WebProxy();
proxy.Address = new Uri(58.22.62.163:888/
proxy.Credentials = new NetworkCredential(juese, 1029
// 在发起HTTP请求前将proxy赋值给HttpWebRequest的Proxy 属性
httpRequest.Proxy = proxy;
//-------------------------------------------------
HttpWebResponse res = (HttpWebResponse)httpRequest.GetResponse();
StreamReader reader = new StreamReader(res.GetResponseStream(), System.Text.Encoding.UTF8);
string content = reader.ReadToEnd();
reader.Close();
二:WebClien:与上面类似,
WebClient wc = new WebClient();
WebProxy proxy = new WebProxy();
proxy.Address = new Uri(58.22.62.163:888/
proxy.Credentials = new NetworkCredential(juese, 1029
wc.Proxy = proxy;
Stream PageHtml = wc.OpenRead(
StreamReader reader = new StreamReader(PageHtml, System.Text.Encoding.UTF8);
string content = reader.ReadToEnd();
return content;
三:HttpWebClientProtocol:针对webService的代理IP使用(详情可参加TTS交互服务的WebServiceHelper.cs):
// 获取WSDL
WebClient wc = new WebClient();
stream = wc.OpenRead(url);
ServiceDesc ription sd = ServiceDesc ription.Read(stream);
ServiceDesc riptionImporter sdi = new ServiceDesc riptionImporter();
sdi.AddServiceDesc ription(sd, string.Empty, string.Empty);
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 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.xm l.dll
cplist.ReferencedAssemblies.Add(System.Web.Services.dll
cplist.ReferencedAssemblies.Add(System.Data.dll
////此处不停编译,会造成内存泄露
// 编译代理类
cr = pileAssemblyFromDom(cplist, ccu);
// 生成代理实例,并调用方法
System.Reflection.Assembly assembly = piledAssembly;
Type t = assembly.GetType(@namespace + . + classname, true, true);
ob ject obj = Activator.CreateInstance(t);
if (ConfigurationManager.AppSettings[UseYeexingProxy] == true)
{
ICredentials cred;
WebProxy p = null;
var prox = obj as HttpWebClientProtocol;
string proxyAddressAndPort = ConfigurationManager.AppSettings[ProxyIP
string proxyUserName = ConfigurationManager.AppSettings[ProxyName
string proxyPassword = ConfigurationManager.AppSettings[ProxyPwd
cred = new NetworkCredential(proxyUserName, proxyPassword);
p = new WebProxy(proxyAddressAndPort, true, null, cred);
prox.Proxy = p;
System.Reflection.MethodInfo mi = t.GetMethod(methodname);
return mi.Invoke(prox, args);
}
else
{
System.Reflection.MethodInfo mi = t.GetMethod(methodname);
return mi.Invoke(obj, args);
}
在网上查看相关文档,很容易将Proxy属性加在WebClient上,然而此处却直接将Proxy传入,并异步调用易行接口