C# 之 FTPserver中文件上传与下载（二）

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mob604756e88498 2017-08-03 17:48:00

通过上一篇博客《C# 之 FTPserver中文件上传与下载（一）》，我们已经创建好了一个FTPserver，而且该server须要username和password的验证。今天我们来实现文件的上传。

首先，我们前台须要一个FileUpload控件和一个Button控件

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:FileUpload ID="fuImage" runat="server" Width="400px" />
    <asp:Button runat="server" ID="btnUpLoad" Text="上传" CssClass="nButton" OnClick="btnUpLoad_Click" />
    </div>
    </form>
</body>
</html>

然后我们開始编写后台的上传代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btnUpLoad_Click(object sender, EventArgs e)
    {
        string strFtpPath = "FTP://192.168.1.100:21";   //ftp地址
        string strUserName = "hehe";    //用户名
        string strPassword = "123456";  //密码  
        Boolean flag = false;

        string strFullName = "";
        if (fuImage.PostedFile.FileName != "")
        {
            strFullName = fuImage.PostedFile.FileName;  //所选择文件的路径
        }
        else
        {
            Response.Write("<script>alert('请选择要上传的文件！');</script>");
        }

        //上传文件
        System.IO.FileInfo fileInfo = new System.IO.FileInfo(fuImage.PostedFile.FileName);
        flag=UploadFile(fileInfo, strFtpPath, strUserName, strPassword);

        if (flag==true)
        {
            Response.Write("<script>alert('文件上传成功！

');</script>"); } else { Response.Write("<script>alert('文件上传失败。');</script>"); } } /// <summary> /// 上传文件 /// </summary> /// <param name="fileinfo">须要上传的文件</param> /// <param name="targetDir">目标路径</param> /// <param name="hostname">ftp地址</param> /// <param name="username">ftp用户名</param> /// <param name="password">ftp密码</param> /// <returns></returns> public static Boolean UploadFile(System.IO.FileInfo fileinfo, string hostname, string username, string password) { string strExtension = System.IO.Path.GetExtension(fileinfo.FullName); string strFileName=""; strFileName = fileinfo.Name; //获取文件的文件名称 string URI = hostname + "/" + strFileName; //获取ftp对象 System.Net.FtpWebRequest ftp = GetRequest(URI, username, password); //设置ftp方法为上传 ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile; //制定文件传输的数据类型 ftp.UseBinary = true; ftp.UsePassive = true; //文件大小 ftp.ContentLength = fileinfo.Length; //缓冲大小设置为2kb const int BufferSize = 2048; byte[] content = new byte[BufferSize - 1 + 1]; int dataRead; //打开一个文件流（System.IO.FileStream)去读上传的文件 using (System.IO.FileStream fs = fileinfo.OpenRead()) { try { //把上传的文件写入流 using (System.IO.Stream rs = ftp.GetRequestStream()) { do { //每次读文件流的2KB dataRead = fs.Read(content, 0, BufferSize); rs.Write(content, 0, dataRead); } while (!(dataRead < BufferSize)); rs.Close(); return true; } } catch (Exception ex) { ftp = null; ftp = GetRequest(URI, username, password); ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile;//删除 ftp.GetResponse(); return false; } finally { fs.Close(); } } } /// <summary> /// 得到ftp对象 /// </summary> /// <param name="URI">ftp地址</param> /// <param name="username">ftp用户名</param> /// <param name="password">ftp密码</param> /// <returns>返回ftp对象</returns> private static System.Net.FtpWebRequest GetRequest(string URI, string username, string password) { //依据server信息FtpWebRequest创建类的对象 FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI); //提供身份验证信息 result.Credentials = new System.Net.NetworkCredential(username, password); //result.Credentials = new System.Net.NetworkCredential(); //设置请求完毕之后是否保持到FTPserver的控制连接，默认值为true result.KeepAlive = false; return result; } }

最后看看我们执行的效果吧

C# 之 FTPserver中文件上传与下载（二）_文件上传