1、web前台页面文件上传的文件大小限制问题
1.1 通过Web.Config配置上传文件的大小限制（涉及站点安全问题，谨慎配置！！！）。
<system.webServer> <security> <requestFiltering> <requestLimits maxQueryString="10240" maxAllowedContentLength="2147483647" /> <!—限制2G--> </requestFiltering> </security> </system.webServer>
1.2 通过后台C#代码进行上传文件大小的限制。
/* 判断上传的文件大小是否超出限制的大小 */ public bool isOutFileSizeLimit(System.Web.HttpContext context,int nFileSize) { if(context.Request.ContentLength>nFileSize) { return true; //超出限制 } else { return false; //未超出限制 } }
上述两种方法的使用可满足不同的需求，并不是可以相互替代的解决方法。新手总结，还望读者自行甄别使用。
2、.net线程池的应用
1 using System.Threading; 2 3 namespace Threading_Test.Test 4 { 5 /// <summary> 6 ///线程池处理函数输入参数类的封装 7 /// </summary> 8 internal class SynDataParam 9 { 10 public bool bIsSysData; //标识 11 public string sFolderPath; //ftp路径 12 public string sFolderPath_Tk; //ftp路径tk 13 14 /// <summary> 15 /// 构造函数 16 /// </summary> 17 /// <param name="p_bIsSysData">标识</param> 18 /// <param name="p_sFolderPath">ftp路径</param> 19 /// <param name="p_sFolderPath_Tk">ftp路径tk</param> 20 public SynDataParam(bool p_bIsSysData, string p_sFolderPath,string p_sFolderPath_Tk) 21 { 22 bIsSysData = p_bIsSysData; 23 sFolderPath = p_sFolderPath; 24 sFolderPath_Tk = p_sFolderPath_Tk; 25 } 26 } 27 28 public class Test 29 { 30 public void main() 31 { 32 ThreadPool.QueueUserWorkItem(new WaitCallback(this.SynDataToTiKu), new SynDataParam(true,l_sPartContentFtpPath,"123")); 33 } 34 35 /// <summary> 36 /// 37 /// </summary> 38 /// <param name="state">传入SynDataParam类型的参数</param> 39 public void SynDataToTiKu(Object state) 40 { 41 SynDataParam SynDataParam=state as SynDataParam; 42 43 if (SynDataParam.bIsSysData) 44 { 45 46 } 47 } 48 49 } 50 }
3、web service的http请求调用方式（不通过vs的服务引用功能）
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Web; using System.IO; using System.Web.Configuration; using System.Net;
namespace yu.zhi.hui { public class GetOrSetDataByWebService { /***web service的http post方式调用***/ /// <summary> /// 获取结果（这个方法主要是获取PostUrl 然后调用GetPostRequest） /// </summary> /// <param name="sQueryStr">接口的输入参数，形如：sLevel=string&sFormat=string</param> /// <param name="interfaceName">需要调用的对方接口方法名</param> /// <returns>返回接口的返回值</returns> public string GetOrSetDataByWsWithHttpPost(string sQueryStr, string interfaceName,string sWsPath) { //post调用方式的url:"http://xxx.xxx.xx.xx:xxxx/xxxx.asmx/Get_xxx" string PostUrl = sWsPath + "/" + interfaceName; byte[] data = Encoding.UTF8.GetBytes(sQueryStr.ToString()); string resCode = GetPostRequest(data, PostUrl); return resCode; } /// <summary> /// Http Post方式调用ws接口--发送请求数据并获取响应数据 /// </summary> /// <param name="data"></param> /// <param name="url"></param> /// <returns></returns> private string GetPostRequest(byte[] data, string url) { try { //创建请求 HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);//完整的请求地址（ip：端口号/+url） myRequest.Method = "POST"; myRequest.ContentType = "application/x-www-form-urlencoded"; myRequest.Accept = "text/xml"; myRequest.Headers.Add("SOAPAction", url);//是否和请求一起发送 myRequest.UseDefaultCredentials = true; myRequest.ContentLength = data.Length;//创建输入流 Stream newStream = myRequest.GetRequestStream(); //发送请求 Send the data. newStream.Write(data, 0, data.Length); newStream.Close(); /*-请求end-*/ /*-响应begin-*/ //创建响应 Get response var response = (HttpWebResponse)myRequest.GetResponse(); using (var reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("UTF-8"))) { //读取响应 string result = reader.ReadToEnd(); reader.Close(); response.Close(); return result; } } catch (Exception ex) { return ex.ToString(); } } } }
4、直接保存字符串到ftp服务器上的文件中
/// <summary> /// 保存字符串到ftp的文件中 /// </summary> /// <param name="sStr">待保存字符串</param> /// <param name="sFtpUrl">ftp服务器的url</param> /// <param name="sFilePath">文件路径</param> /// <param name="sFtpUser">ftp服务器用户名</param> /// <param name="sFtpPwd">ftp服务器密码</param> public bool SaveStringToFileOnFtp(string sStr, string sFtpUrl,string sFilePath,string sFtpUser,string sFtpPwd) { try { //上传到ftp服务器 FtpWebRequest reqFTP; Uri uri = new Uri(sFtpUrl + sFilePath); string sPartialPathOfFile = sFilePath.Substring(0, sFilePath.LastIndexOf("/") + 1); //创建文件所在文件夹 FtpCheckDirectoryExist(sFtpUrl, sPartialPathOfFile, sFtpUser, sFtpPwd); reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri); reqFTP.Credentials = new NetworkCredential(sFtpUser, sFtpPwd); reqFTP.Method = WebRequestMethods.Ftp.UploadFile; reqFTP.KeepAlive = false; reqFTP.UseBinary = true; reqFTP.Proxy = null; int buffLength = 2048; //每次读入文件流2kb byte[] buff = new byte[buffLength]; //将字符串读入内存 MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(sStr)); Stream requestStream = reqFTP.GetRequestStream(); int len = stream.Read(buff, 0, buff.Length); while (len > 0) { requestStream.Write(buff, 0, len); len = stream.Read(buff, 0, buffLength); } stream.Close(); requestStream.Close(); stream.Dispose();//释放资源 requestStream.Dispose();//释放资源 return true; } catch(Exception ex) { ex.ToString(); return false; } } /// <summary> /// 判断文件的目录是否存,不存则创建 /// </summary> /// <param name="destFilePath"></param> private static void FtpCheckDirectoryExist(string strFtpURI, string destFilePath, string strFtpUserID, string strFtpPassword) { string fullDir = destFilePath.Substring(0, destFilePath.LastIndexOf("/")); string[] dirs = fullDir.Split('/'); string curDir = ""; for (int i = 0; i < dirs.Length; i++) { string dir = dirs[i]; //如果是以/开始的路径,第一个为空 if (dir != null && dir.Length > 0) { try { curDir += dir + "/"; FtpMakeDir(strFtpURI, curDir, strFtpUserID, strFtpPassword); } catch (Exception) { } } } } /// <summary> /// 创建ftp目录 /// </summary> private static Boolean FtpMakeDir(string strFtpURI, string destFilePath, string strFtpUserID, string strFtpPassword) { FtpWebRequest req = (FtpWebRequest)WebRequest.Create(strFtpURI + destFilePath); req.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); req.Proxy = null; req.KeepAlive = false; req.Method = WebRequestMethods.Ftp.MakeDirectory;//请求方法为创建目录方法 req.UseBinary = true; FtpWebResponse response = req.GetResponse() as FtpWebResponse; Stream ftpStream = response.GetResponseStream(); ftpStream.Close(); response.Close(); req.Abort(); return true; }
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