C#学习笔记之通过http请求连接服务器

服务端使用java实现，首先创建一个Servlet，在Tomcat上发布，接受客户端的连接：

package com.http.demo;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class Demo1 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("UTF-8");response.setContentType("text/html, charset=utf-8"); // 获取请求数据String username = request.getParameter("username");String password = request.getParameter("password");System.out.println(username + " -- " + password);// 输出响应结果response.getOutputStream().write("连接成功！".getBytes());}public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet(request, response);}}

然后编写C#程序发送http请求，连接服务器：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net;using System.IO;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            string requestData = "username=admin&password=123";                 // 发送的数据            string url = "http://localhost:8080/HttpServerDemo/servlet/Demo1";  // 服务器地址            //string result = HttpGet(url, requestData);    // GET请求            string result = HttpPost(url, requestData);     // POST请求            Console.WriteLine("响应结果：" + result);            Console.ReadKey();        }        private static String HttpGet(string url, string requestData)        {            // 实例化请求对象            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url + "?" + requestData);            request.Method = "GET";            request.ContentType = "text/html; charset=UTF-8";            // 实例化响应对象，获取响应信息            HttpWebResponse response = (HttpWebResponse)request.GetResponse();            Stream responseStream = response.GetResponseStream();            StreamReader sReader = new StreamReader(responseStream, Encoding.Default);            String result = sReader.ReadToEnd();            sReader.Close();            responseStream.Close();            return result;        }        private static String HttpPost(string url, string requestData)        {            // 实例化请求对象            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);            request.Method = "POST";            request.ContentType = "application/x-www-form-urlencoded";            request.ContentLength = requestData.Length;                        // 发送请求数据            Stream requestStream = request.GetRequestStream();            StreamWriter sWriter = new StreamWriter(requestStream, Encoding.Default);            sWriter.Write(requestData);            sWriter.Flush();            sWriter.Close();            requestStream.Close();            // 实例化响应对象，获取响应信息            HttpWebResponse response = (HttpWebResponse)request.GetResponse();            Stream responseStream = response.GetResponseStream();            StreamReader sReader = new StreamReader(responseStream, Encoding.Default);            String result = sReader.ReadToEnd();            sReader.Close();            responseStream.Close();            return result;        }    }}