C#访问HTTP请求

阳光穿透心脏的1/2处 2021-06-24 15:57 499阅读 0赞

代码连接：[http://download.csdn.net/download/tr1912/10104222][http_download.csdn.net_download_tr1912_10104222]

# 一、业务需求 #

由于需要在一个写好的C/S系统上调用一个用java写好的restful风格的接口，所以我就去查找了一下用.net程序发送get，或者post请求的方法，去请求已经用java写好的web接口，由于纯窗体风格的C/S系统没有自带的http请求方法，所以需要用到system.net这个引用才能实现我们的调用要求。

# 二、代码实现 #

下面是实现的代码，我先贴出来：

using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Text; namespace echuUI { public class HTTPSendingHelper { /// <summary> /// Get方式获取url地址输出内容 /// </summary> /// <param name="url">url</param> /// <param name="encoding">返回内容编码方式，例如：Encoding.UTF8</param> public static String SendRequest(String url, Encoding encoding) { HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url); webRequest.Method = "GET"; HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse(); StreamReader sr = new StreamReader(webResponse.GetResponseStream(), encoding); return sr.ReadToEnd(); } } }

其实在这个里面，我们主要用的using System.Net;这个引用来实现的具体操作，这个里面封装了HttpWebRequest这个操作对象，我们不难发现，这些东西，其实微软的这个.net平台已经为我们准备完成了，所以我们可以直接就调用了，顺便查了一下在ASP.net中是怎么用的：

//get方法调用接口获取json文件内容
            public void GetFunction()
            {
               
                string serviceAddress = "http://222.111.999.444:8687/tttr/usercrd/12/b7e50cb45a?userid=9999";
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serviceAddress);
                request.Method = "GET";
                request.ContentType = "text/html;charset=UTF-8";
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Stream myResponseStream = response.GetResponseStream();
                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
                string retString = myStreamReader.ReadToEnd();
                myStreamReader.Close();
                myResponseStream.Close();
                Response.Write(retString);
            }
    
            post方法调用接口获取json文件内容
            public void PostFunction()
            {
    
                string serviceAddress = "http://222.111.999.444:8687/tttr/usercrd/uuu/12/dfd7e4";
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serviceAddress);
    
                request.Method = "POST";
                request.ContentType = "application/json";
                string strContent = @"{ ""mmmm"": ""89e"",""nnnnnn"": ""0101943"",""kkkkkkk"": ""e8sodijf9""}";
                using (StreamWriter dataStream = new StreamWriter(request.GetRequestStream()))
                {
                    dataStream.Write(strContent);
                    dataStream.Close();
                }
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                string encoding = response.ContentEncoding;
                if (encoding == null || encoding.Length < 1)
                {
                    encoding = "UTF-8"; //默认编码  
                }
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(encoding));
                string retString = reader.ReadToEnd();
                //解析josn
                JObject jo = JObject.Parse(retString);
                Response.Write(jo["message"]["mmmm"].ToString());
              
            }

我们可以看到，他就是调用的这个 HttpWebRequest对象，好像也得做这种引用，看来.net封装的这种东西都是共用性很强的东西啊。

[http_download.csdn.net_download_tr1912_10104222]: http://download.csdn.net/download/tr1912/10104222