上传文件到服务器端_C#
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 www.xinduofen.com
{
///
/// 用于缓存服务器端传输到客户端的SESSIONID或者JSESSIONID
///
private Cookie sessionidCookie = null;
///
/// 向HttpWebServer端上传文件(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
/// 上传文件集合《控件名,上传文件的保存位置(包括"文件名"."扩展名")》,无需上传时传入null值
/// 返回请求结果字符串，返回为null代表请求失败
public String setFilesToHttpWebServer(String url, Hashtable data, CookieCollection cookies, Hashtable filesSaveAddress)
{
//用于缓存服务器端传输回来的结果字符串
string result = null;
if (string.IsNullOrEmpty(url))
{
return null;//传入参数异常
}
//用于分割信息部分的分隔符(不能与消息原文冲突)
String boundary = "HttpWebTool" + DateTime.Now.Ticks;
//结束分隔符数据流
byte[] andBoundary = Encoding.UTF8.GetBytes("--" + boundary + "--");
//新行字符串数据流
byte[] newline = Encoding.UTF8.GetBytes("\r\n");
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";
//以消息的形式向服务器传递参数和数据流
req.ContentType = "multipart/form-data; boundary=" + boundary;
//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;
//用于累计数据流长度，初始化为0
long dataCount = 0;
byte[] parameterBytes = getParameterBytes(data, boundary);
if (parameterBytes != null && parameterBytes.Length>0)
{
//累计请求参数字符串数据流大小
dataCount += parameterBytes.Length;
}
//<控件名，上传文件的消息头部分字符流byte[]>
Hashtable uploadFileDeclareBytesSet = new Hashtable();
//如果有要上传的文件
if (filesSaveAddress != null && filesSaveAddress.Count > 0)
{
foreach (DictionaryEntry de in filesSaveAddress)
{
//如果将要上传的文件存在
if (File.Exists(de.Value.ToString()))
{
byte[] uploadFileDeclareBytes = getUploadFileDeclareBytes(de, boundary);
if (uploadFileDeclareBytes!=null)
{
//累计上传文件消息头部描述字符串数据流大小
dataCount += uploadFileDeclareBytes.Length;
//累计上传文件正文数据流大小
dataCount += new FileInfo(de.Value.ToString()).Length;
//累计新行字符串数据流数据流大小
dataCount += newline.Length;
uploadFileDeclareBytesSet.Add(de.Key.ToString(), uploadFileDeclareBytes);
}
}
}
}
//如果有数据流
if (dataCount>0)
{
//累计结束分隔符数据流大小
dataCount += andBoundary.Length;
//请求数据流的长度
req.ContentLength = dataCount;
using (Stream requestStream = req.GetRequestStream())
{
if (parameterBytes != null && parameterBytes.Length > 0)
{
requestStream.Write(parameterBytes, 0, parameterBytes.Length);
}
if (filesSaveAddress != null && filesSaveAddress.Count > 0)
{
foreach (DictionaryEntry de in filesSaveAddress)
{
if (File.Exists(de.Value.ToString()))
{
byte[] uploadFileDeclareBytes = (byte[])uploadFileDeclareBytesSet[de.Key.ToString()];
requestStream.Write(uploadFileDeclareBytes, 0, uploadFileDeclareBytes.Length);
using (FileStream fileStream = new FileStream(de.Value.ToString(), FileMode.Open, FileAccess.Read))
{
//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 = fileStream.Read(bytes, 0, bytes.Length)) > 0)
{
requestStream.Write(bytes, 0, n); //将指定字节的流信息写入文件流中
}
}
requestStream.Write(newline, 0, newline.Length);
}
}
}
requestStream.Write(andBoundary, 0, andBoundary.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
/// 返回参数data的数据流，返回为空代表获得失败
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
/// 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
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;
}
}
}
