ASP.NET 上传图片到FTP

目录:

　　2.代码

　　3.参考资料

　　4.IIS环境FTP配置

　　5.使用虚拟目录注意Server.MapPath()

1. 项目介绍

   建立FTP文件服务器与应用程序分开.

   下面方法中的参数为Stream因为使用的是fineUI,已经将流上传,如果是其他控件,后面有FileStream,Bitmap,byte[]之间的参考资料.

2.测试代码

/// <summary>
        /// Bitmap:封装 GDI+ 包含图形图像和其属性的像素数据的位图。 一个 Bitmap 是用来处理图像像素数据所定义的对象。
        /// 难点:
        ///         1.Stream转Bitmap,压缩图片
        ///         2.Bitmap 与 byte[] 转换 (Bitmap转MemoryStream,再通过ms.ToArray()转byte[])
        ///         3.创建FTP上载数据流,写入字节数(FTP服务器分IIS级别配置,和应用程序级别配置,两个要一致.安全级别高的使用指定用户,安全低的可以所以用户)
        ///         
        /// </summary>
        /// <param name="stream">继承抽象类的实例(一般是FileStream,MemoryStream)</param>
        /// <param name="url">FTP地址</param>
        /// <param name="filename">服务器中的文件名(ftp://192.168.1.127/190_140/636288137130851325admin_Penguins.jpg)</param>
        public void SaveStream(Stream stream,string url,string filename)
        {
            MemoryStream ms = null;
            Stream strm = null;
            try
            {
                /// 1.Stream 转成 Bitmap 并压缩图片
                Bitmap pimage = new Bitmap(stream);
                System.Drawing.Imaging.ImageFormat fromat = pimage.RawFormat;
                Bitmap bitNewPic = new Bitmap(pimage, 190, 140);
                /// 2.Bitmap 转成MemoryStream(继承Stream抽象类)
                ms = new MemoryStream();
                bitNewPic.Save(ms, fromat);
                /// 3.MemoryStream转成byte[]数组 "imagebyte"
                byte[] imagebyte = new Byte[ms.Length];
                imagebyte = ms.ToArray();
                /// 4.创建FTP服务器连接 "reqFTP"
                string uri = filename;
                FtpWebRequest reqFTP;
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                reqFTP.Credentials = new NetworkCredential("administrator", "vtlongxing");
                reqFTP.KeepAlive = false;
                reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
                reqFTP.UseBinary = true;
                reqFTP.ContentLength = imagebyte.Length;
                /// 5.创建FTP服务器上载数据的流 "strm",并向"strm"写入字节序列
                strm = reqFTP.GetRequestStream();
                strm.Write(imagebyte, 0, imagebyte.Length);
            }
            catch (Exception ex)
            {
            }
            finally
            {
                /// 6.关闭各"流"
                strm.Close(); 
                ms.Close();
                stream.Close();
            }
        }

3.filestream,bety,Bitmap操作参考

http://blog.csdn.net/wangyue4/article/details/6819102

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Web;

namespace AppBox.CRM.Gift
{
    public class ImageHelper
    {
        //byte[] 转图片  
        public static Bitmap BytesToBitmap(byte[] Bytes)
        {
            MemoryStream stream = null;
            try
            {
                stream = new MemoryStream(Bytes);
                return new Bitmap((Image)new Bitmap(stream));
            }
            catch (ArgumentNullException ex)
            {
                throw ex;
            }
            catch (ArgumentException ex)
            {
                throw ex;
            }
            finally
            {
                stream.Close();
            }
        }

        //图片转byte[]   
        public static byte[] BitmapToBytes(Bitmap Bitmap)
        {
            MemoryStream ms = null;
            try
            {
                ms = new MemoryStream();
                Bitmap.Save(ms, Bitmap.RawFormat);
                byte[] byteImage = new Byte[ms.Length];
                byteImage = ms.ToArray();
                return byteImage;
            }
            catch (ArgumentNullException ex)
            {
                throw ex;
            }
            finally
            {
                ms.Close();
            }
        }



        /// <summary>  
        /// 将 Stream 转成 byte[]  
        /// </summary>  
        public byte[] StreamToBytes(Stream stream)
        {
            byte[] bytes = new byte[stream.Length];
            stream.Read(bytes, 0, bytes.Length);

            // 设置当前流的位置为流的开始  
            stream.Seek(0, SeekOrigin.Begin);
            return bytes;
        }

        /// <summary>  
        /// 将 byte[] 转成 Stream  
        /// </summary>  
        public Stream BytesToStream(byte[] bytes)
        {
            Stream stream = new MemoryStream(bytes);
            return stream;
        }


        /* - - - - - - - - - - - - - - - - - - - - - - - -  
         * Stream 和 文件之间的转换 
         * - - - - - - - - - - - - - - - - - - - - - - - */
        /// <summary>  
        /// 将 Stream 写入文件  
        /// </summary>  
        public void StreamToFile(Stream stream, string fileName)
        {
            // 把 Stream 转换成 byte[]  
            byte[] bytes = new byte[stream.Length];
            stream.Read(bytes, 0, bytes.Length);
            // 设置当前流的位置为流的开始  
            stream.Seek(0, SeekOrigin.Begin);

            // 把 byte[] 写入文件  
            FileStream fs = new FileStream(fileName, FileMode.Create);
            BinaryWriter bw = new BinaryWriter(fs);
            bw.Write(bytes);
            bw.Close();
            fs.Close();
        }

        /// <summary>  
        /// 从文件读取 Stream  
        /// </summary>  
        public Stream FileToStream(string fileName)
        {
            // 打开文件  
            FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
            // 读取文件的 byte[]  
            byte[] bytes = new byte[fileStream.Length];
            fileStream.Read(bytes, 0, bytes.Length);
            fileStream.Close();
            // 把 byte[] 转换成 Stream  
            Stream stream = new MemoryStream(bytes);
            return stream;
        }
    }
}

4.IIS下FTP配置

(FTP服务器分IIS级别配置,和应用程序级别配置,两个要一致.安全级别高的使用指定用户,安全低的可以所以用户)

http://www.juheweb.com/Tutorials/fwq/windows/335.html

5.虚拟目录   (使用虚拟目录和相对路径要用Server.MapPath())

// <virtualDirectory path="/VImage/" physicalPath="D:UploadfileCRMImage" /> iis express 配置虚拟目录
        string strImagePathV = "~/upimage/";//虚拟目录
        string strImagePath190_140V = "~/upimage/190_140/";//虚拟目录
string strPath = Server.MapPath(strImagePathV + fileName);
                string strPathchange = Server.MapPath(strImagePath190_140V + fileName);
UploadImage img = new UploadImage();
                img.Save(tab1UploadImage.PostedFile.InputStream, strPathchange);

public class UploadImage
    {
        public bool Save(Stream stream, string imagename)
        {
            try
            {
                Bitmap pimage = new Bitmap(stream);
                Bitmap bitNewPic = new Bitmap(pimage, 190, 140);
                bitNewPic.Save(imagename, System.Drawing.Imaging.ImageFormat.Jpeg);
                return true;
            }
            catch (Exception ex)
            {
                return false;
            }
        }

    }