using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Net;
using System.IO;
namespace www.xinduofen.com
{
/// <summary>
/// C#与http服务器端进行对接的工具类
/// </summary>
class www.xinduofen.cn
{
/// <summary>
/// 用于缓存服务器端传输到客户端的SESSIONID或者JSESSIONID
/// </summary>
private Cookie sessionidCookie = null;
/// <summary>
/// 从HttpWebServer端获取文件(使用的是"post"方式)
/// </summary>
/// <param name="url">请求网址</param>
/// <param name="data">请求参数集合，无需参数时传入null值</param>
/// <param name="cookies">请求cookie集合，无需cookie时传入null值</param>
/// <param name="fileSaveAddress">下载文件将要保存的位置(包括"文件名"."扩展名")</param>
/// <returns>返回true代表成功，false代表失败</returns>
public Boolean getFileFromHttpWebServer(String url, Hashtable data, CookieCollection cookies,String fileSaveAddress)
{
Boolean result = false;
if (string.IsNullOrEmpty(url) || string.IsNullOrEmpty(fileSaveAddress))
{
return false;//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";
//声明客户端接收任意类型的文件流
req.Accept = "application/octet-stream";
//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()) {
if (myResponse.Cookies["SESSIONID"] != null)
{
sessionidCookie = myResponse.Cookies["SESSIONID"];
}
else
{
if (myResponse.Cookies["JSESSIONID"] != null)
{
sessionidCookie = myResponse.Cookies["JSESSIONID"];
}
}
////下面为服务器端返回的下载文件名,留下作为参考用的
//if (myResponse.StatusCode == HttpStatusCode.OK)
//{
// byte[] str = Encoding.GetEncoding("ISO-8859-1").GetBytes(myResponse.GetResponseHeader("Content-Disposition"));
// string disposition = Encoding.UTF8.GetString(str);
// Console.WriteLine("disposition：" + disposition);
//}
//流对象使用完后自动关闭
using (Stream stream = myResponse.GetResponseStream())
{
//文件流，流信息读到文件流中，读完关闭
using (FileStream fs = File.Create(fileSaveAddress))
{
//建立字节组，并设置它的大小是多少字节
byte[] bytes = new byte[10240];
int n = -1;
while ((n = stream.Read(bytes, 0, bytes.Length)) > 0)
{
fs.Write(bytes, 0, n); //将指定字节的流信息写入文件流中
}
}
}
}
result = true;//下载成功
}
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;
}
/// <summary>
/// 获得参数data的消息数据流，以"\r\n"结尾
/// </summary>
/// <param name="data">请求参数集合，无需参数时传入null值</param>
/// <param name="boundary">消息分隔符</param>
/// <returns>返回参数data的数据流，返回为空代表获得失败</returns>
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;
}
/// <summary>
/// 获得上传文件的消息头部分字符流，以"\r\n\r\n"结尾
/// </summary>
/// <param name="de">上传文件《控件名,上传文件的保存位置(包括"文件名"."扩展名")》</param>
/// <param name="boundary">消息分隔符</param>
/// <returns>返回上传文件的消息头部分字符流，返回会为null代表获得失败</returns>
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;
}
}
}