C#的http协议的网络编程
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Net;
using System.IO;
namespace www.xinduofen.cn
{
///
/// C#与http服务器端进行对接的工具类
///
class HttpWebTool
{
///
/// 用于缓存服务器端传输到客户端的SESSIONID或者JSESSIONID
///
private Cookie sessionidCookie = null;
///
/// 从HttpWebServer端获取数据(使用的是"post"方式)
///
/// 请求网址
/// 请求参数集合，无需参数时传入null值
/// 请求cookie集合，无需cookie时传入null值
///
public String getDatafromHttpWebServer(String url, Hashtable data,CookieCollection cookies)
{
String result = null;
if (string.IsNullOrEmpty(url))
{
return null;//传入参数异常
}
byte[] data_stream = null;//将要向服务器传输的数据流内容
if (data != null && data.Count > 0)
{
string transportData = "";//将要向服务器传输的字符串内容
foreach (DictionaryEntry de in data)
{
transportData = transportData + de.Key.ToString() + "=" + de.Value.ToString() + "&";//解调出键值对数据
}
transportData = transportData.TrimEnd('&');//去除字符串尾部的 &
if (!string.IsNullOrEmpty(transportData))
{
data_stream = Encoding.UTF8.GetBytes(transportData);//将上传字符串数据打包成数据流
}
}
try
{
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
//请求方式
req.Method = "POST";
//声明客户端只接收txt类型的内容
req.Accept = "text/plain";
//以键值对形式向服务器传递参数
req.ContentType = "application/x-www-form-urlencoded";
//设置cookie盒子(客户端请求的cookie和服务器端返回的cookie就放在此盒子中)
CookieContainer cookieContainer = new CookieContainer();
if (sessionidCookie != null && !string.IsNullOrEmpty(sessionidCookie.Domain))
{
cookieContainer.Add(sessionidCookie);
}
if (cookies!=null)
{
cookieContainer.Add(cookies);//添加调用者传入的cookie集合
}
req.CookieContainer = cookieContainer;
if (data_stream != null && data_stream.Length > 0)
{
//请求数据流的长度
req.ContentLength = data_stream.Length;
using (Stream requestStream = req.GetRequestStream()) {
//写入请求实体流
requestStream.Write(data_stream, 0, data_stream.Length);
}
}
//接收返回值
using(HttpWebResponse myResponse = (HttpWebResponse)req.GetResponse()){
using (StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8))
{
result = reader.ReadToEnd().Trim();
}
if (myResponse.Cookies["SESSIONID"] != null)
{
sessionidCookie = myResponse.Cookies["SESSIONID"];
}
else
{
if (myResponse.Cookies["JSESSIONID"] != null)
{
sessionidCookie = myResponse.Cookies["JSESSIONID"];
}
}
}
}catch(Exception){
Console.WriteLine("请查看传入参数是否正确或者服务器是否关闭");
}
return result;
}
///
/// 获得参数data的消息数据流，以"\r\n"结尾
///
/// 请求参数集合，无需参数时传入null值
/// 消息分隔符
///
private byte[] getParameterBytes(Hashtable data, String boundary)
{
byte[] parameterBytes = null;
//如果有请求参数
if (data != null && data.Count > 0)
{
string parameterStr = "";
foreach (DictionaryEntry de in data)
{
parameterStr += "--" + boundary;
parameterStr += "\r\n" + "Content-Disposition: form-data;name=\"" + de.Key.ToString() + "\"";
parameterStr += "\r\n" + "Content-Type: text/plain; charset=UTF-8";
parameterStr += "\r\n\r\n" + de.Value.ToString();
parameterStr += "\r\n";
}
if (!string.IsNullOrEmpty(parameterStr))
{
parameterBytes = Encoding.UTF8.GetBytes(parameterStr);//将上传字符串数据打包成数据流
}
}
return parameterBytes;
}
///
/// 获得上传文件的消息头部分字符流，以"\r\n\r\n"结尾
///
/// 上传文件《控件名,上传文件的保存位置(包括"文件名"."扩展名")》
/// 消息分隔符
///
private byte[] getUploadFileDeclareBytes(DictionaryEntry de, String boundary)
{
byte[] uploadFileDeclareBytes = null;
//上传文件的消息头描述部分
string uploadFileDeclareStr = "";
uploadFileDeclareStr += "--" + boundary;
uploadFileDeclareStr += "\r\n" + "Content-Disposition: form-data;name=\"" + de.Key.ToString() + "\"; filename=\"" + de.Value.ToString() + "\"";
uploadFileDeclareStr += "\r\n" + "Content-Type: application/octet-stream";
uploadFileDeclareStr += "\r\n\r\n";
if (!string.IsNullOrEmpty(uploadFileDeclareStr))
{
uploadFileDeclareBytes = Encoding.UTF8.GetBytes(uploadFileDeclareStr);//将上传字符串数据打包成数据流
}
return uploadFileDeclareBytes;
}
}
}
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