1：使用WebRequest向服务器发送GET请求，获取服务器的响应
1. 创建请求对象
2. 获取web响应
3. 获取web响应流
4.读取Web 流数据
完整代码如下：
var url ="http://webcode.me";//"http://www.baidu.com";
var request = WebRequest.Create(url);
request.Method = "GET";
using (var webResponse = request.GetResponse())
{
using (var webStream = webResponse.GetResponseStream())
{
using (var reader = new StreamReader(webStream))
{
var data = reader.ReadToEnd();
Console.WriteLine(data);
}
}
}
输出：
Today is a beautiful day. We go swimming and fishing.
Hello there. How are you?
2：使用WebRequest向服务器发送POST请求，获取服务器的响应
1. 创建Web请求对象
2. 指定POST方法
3. 创建POST数据对象
4. 将数据对象序列化为JSON字符串
5. 再将Json字符串转换为字节数组
6. 指定请求ContentType类型
7. 获取请求流对象
8. 将转换后的字节数组写入到请求流中
9. 获取请求的响应
10. 读取响应流中的数据
完整代码如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;
using System.Net;
using System.Net.Http;
using System.IO;
namespace _02_HTTP_POST
{
//HTTP POST
//The HTTP POST method sends data to the server.
//It is often used when uploading a file or when submitting a completed web form.
class Program
{
//C# POST request with WebRequest
//creates a POST request with WebRequest.
static void Main(string[] args)
{
var url = "https://httpbin.org/post"; //发POST请求的服务器地址
var request = WebRequest.Create(url);
request.Method = "POST";
var user = new User("John Doe", "gardener");
var json = JsonConvert.SerializeObject(user);
byte[] byteArray = Encoding.UTF8.GetBytes(json);//序列化user对象为Json字符串，再将Json字符串转为字节数组
request.ContentType = "application/json";
//request.ContentType = "application/x-www-form-urlencoded";
//默认地，表单数据会编码为 "application/x-www-form-urlencoded"。
//就是说，在发送到服务器之前，所有字符都会进行编码（空格转换为 "+" 加号，特殊符号转换为 ASCII HEX 值）。
request.ContentLength = byteArray.Length;
using (var reqStream = request.GetRequestStream())//获取请求流对象
{
reqStream.Write(byteArray, 0, byteArray.Length);//将POST的内容传入到请求流
using (var response = request.GetResponse())// 获取响应的对象
{
Console.WriteLine(((HttpWebResponse)response).StatusDescription);// 响应状态
using (var respStream = response.GetResponseStream())// 从响应流中读取数据
{
using (var reader = new StreamReader(respStream))
{
string data = reader.ReadToEnd();
Console.WriteLine(data);
}
}
}
}
}
}
class User
{
public string Name { get; set; }
public string Occupation { get; set; }
public User(string name, string occupation)
{
Name = name;
Occupation = occupation;
}
public override string ToString()
{
return $"{Name}: {Occupation}";
}
}
}
输出：
OK
{
"args": {},
"data": "{\"Name\":\"John Doe\",\"Occupation\":\"gardener\"}",
"files": {},
"form": {},
"headers": {
"Content-Length": "43",
"Content-Type": "application/json",
"Host": "httpbin.org",
"X-Amzn-Trace-Id": "Root=1-61aea836-517d25d562b9453c66922bab"
},
"json": {
"Name": "John Doe",
"Occupation": "gardener"
},
"origin": "180.161.88.74",
"url": "https://httpbin.org/post"
}
改变request.ContentType = "application/x-www-form-urlencoded";
输出：
OK
{
"args": {},
"data": "",
"files": {},
"form": {
"{\"Name\":\"John Doe\",\"Occupation\":\"gardener\"}": ""
},
"headers": {
"Content-Length": "43",
"Content-Type": "application/x-www-form-urlencoded",
"Host": "httpbin.org",
"X-Amzn-Trace-Id": "Root=1-61aea885-2ec9f6f639d59dba53b244ad"
},
"json": null,
"origin": "180.161.88.74",
"url": "https://httpbin.org/post"
}
差异：