.NET后台POST与GET请求示例

最新推荐文章于 2025-04-08 09:59:37 发布

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这是一个关于处理HTTP POST和GET请求的C#代码示例，包括HTTPS证书验证。代码中定义了一个CheckValidationResult方法，用于忽略SSL证书错误，确保请求能够成功。同时，提供了PostUrl和Get方法，分别用于发送POST和GET请求，设置了请求头、超时时间等参数，并处理了可能出现的异常。

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using System;
using System.IO;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;

/// <summary>
/// 锁
/// </summary>
/// <param name="sender"></param>
/// <param name="certificate"></param>
/// <param name="chain"></param>
/// <param name="errors"></param>
/// <returns></returns>
public static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
    return true;//直接确认，否则打不开  
}

POST请求

请求方法：
PostUrl("https://www.xxxxxx.com/", "a=1&b=2&c=3", 10, Encoding.UTF8);//POST请求

/// <summary>
/// 处理HTTP POST请求，返回数据
/// </summary>
/// <param name="url">请求地址</param>
/// <param name="postData">请求参数[格式：a=1&b=2&c=3]字符串</param>
/// <param name="timeout">过期时间(单位/秒)</param>
/// <param name="encode">编码[UTF-8、GBK、]</param>
/// <returns></returns>
public static string PostUrl(string url, string postData, int timeout, Encoding encode)
{
    System.GC.Collect();//垃圾回收，回收没有正常关闭的http连接
    string result = "";//返回结果
    HttpWebRequest request = null;
    HttpWebResponse response = null;
    Stream reqStream = null;
    try
    {
        //设置最大连接数
        ServicePointManager.DefaultConnectionLimit = 200;
        //设置https验证方式
        if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
        {
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
            ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
        }
        /***************************************************************
        * 下面设置HttpWebRequest的相关属性
        * ************************************************************/
        request = (HttpWebRequest)WebRequest.Create(url);
        request.KeepAlive = false;
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";
        request.Timeout = timeout * 1000;
        request.Referer = null;
        request.AllowAutoRedirect = true;
        request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        request.Accept = "*/*";

        //设置代理服务器
        //WebProxy proxy = new WebProxy();                          //定义一个网关对象
        //proxy.Address = new Uri(WxPayConfig.PROXY_URL);           //网关服务器端口:端口
        //request.Proxy = proxy;

        //设置POST的数据类型和长度
        byte[] data = System.Text.Encoding.UTF8.GetBytes(postData);
        request.ContentLength = data.Length;

        //往服务器写入数据
        reqStream = request.GetRequestStream();
        reqStream.Write(data, 0, data.Length);
        reqStream.Close();

        //获取服务端返回
        response = (HttpWebResponse)request.GetResponse();

        //获取服务端返回数据
        StreamReader sr = new StreamReader(response.GetResponseStream(), encode ?? Encoding.UTF8);// Encoding.GetEncoding("Shift_JIS")
        result = sr.ReadToEnd().Trim();
        sr.Close();
    }
    catch (System.Threading.ThreadAbortException e)
    {
        Log4Helper.Log("Thread - caught ThreadAbortException - resetting.");
        Log4Helper.Log($"Exception message: {e.Message}");
        System.Threading.Thread.ResetAbort();
    }
    catch (WebException e)
    {
        Log4Helper.Log(e.ToString());
        if (e.Status == WebExceptionStatus.ProtocolError)
        {
            Log4Helper.Log("StatusCode : " + ((HttpWebResponse)e.Response).StatusCode);
            Log4Helper.Log("StatusDescription : " + ((HttpWebResponse)e.Response).StatusDescription);
        }
        throw new HttpServiceException(e.ToString());
    }
    catch (Exception e)
    {
        Log4Helper.Log(e.ToString());
        throw new HttpServiceException(e.ToString());
    }
    finally
    {
        //关闭连接和流
        if (response != null)
        {
            response.Close();
        }
        if (request != null)
        {
            request.Abort();
        }
    }
    return result;
}

GET请求

请求方法：
Get("https://www.xxxxxx.com/", 10, Encoding.UTF8);//GET请求

/// <summary>
/// 处理HTTP GET请求，返回数据
/// </summary>
/// <param name="url">请求的url地址(参数写在地址后面)</param>
/// <param name="timeout">过期时间(单位/秒)</param>
/// <param name="encode">编码[UTF-8、GBK、]</param>
/// <returns>http GET成功后返回的数据，失败抛WebException异常</returns>
public static string Get(string url, int timeout, Encoding encode)
{
    System.GC.Collect();//垃圾回收，回收没有正常关闭的http连接
    string result = "";
    HttpWebRequest request = null;
    HttpWebResponse response = null;

    //请求url以获取数据
    try
    {
        //设置最大连接数
        ServicePointManager.DefaultConnectionLimit = 200;
        //设置https验证方式
        if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
        {
            request.ProtocolVersion = HttpVersion.Version11;
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
            ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
        }
        /***************************************************************
        * 下面设置HttpWebRequest的相关属性
        * ************************************************************/
        request = (HttpWebRequest)WebRequest.Create(url);//创建Http请求
        request.Method = "GET";//请求方式                
        //request.ContentType = contentType;//内容类型                
        request.ReadWriteTimeout = timeout;//读写超时时间

        //设置代理
        //WebProxy proxy = new WebProxy();
        //proxy.Address = new Uri(WxPayConfig.PROXY_URL);
        //request.Proxy = proxy;

        //获取服务器返回
        response = (HttpWebResponse)request.GetResponse();
        //获取HTTP返回数据
        StreamReader sr = new StreamReader(response.GetResponseStream(), encode ?? Encoding.UTF8);
        result = sr.ReadToEnd().Trim();
        sr.Close();
    }
    catch (System.Threading.ThreadAbortException e)
    {
        Log4Helper.Log("Thread - caught ThreadAbortException - resetting.");
        Log4Helper.Log($"Exception message: {e.Message}");
        System.Threading.Thread.ResetAbort();
    }
    catch (WebException e)
    {
        Log4Helper.Log(e.ToString());
        if (e.Status == WebExceptionStatus.ProtocolError)
        {
            Log4Helper.Log("StatusCode : " + ((HttpWebResponse)e.Response).StatusCode);
            Log4Helper.Log("StatusDescription : " + ((HttpWebResponse)e.Response).StatusDescription);
        }
        throw new HttpServiceException(e.ToString());
    }
    catch (Exception e)
    {
        Log4Helper.Log(e.ToString());
        throw new HttpServiceException(e.ToString());
    }
    finally
    {
        //关闭连接和流
        if (response != null)
        {
            response.Close();
        }
        if (request != null)
        {
            request.Abort();
        }
    }
    return result;
}