g.hnyhua.cn/Mtxfw.shop/GetFiles.ashx.cs

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

namespace Mtxfw.shop
{
    public class GetFiles : IHttpHandler
    {
        //参数列表：附件ID，缩略图大小，缩略图质量
        //           aid      itsize        itql           
        //sample     GetFiles.aspx?image=2009\8\29\090829235E70C09C1A31427DBF837E4C01847FA8.jpg&itsize=100x100&itql=80

        Mtxfw.Utility.Config config = new Mtxfw.Utility.Config();
        Mtxfw.Utility.QueryString Query = new Mtxfw.Utility.QueryString();

        public void ProcessRequest(HttpContext context)
        {
            string filepath = "";

            string f = Query.Get("f", "");
            if (f != "")
            {
                filepath = Path.Combine(config.webUpPath, f);
            }
            else
            {
                filepath = GetFullFilePathByPath();
            }
            HttpContext.Current.Response.Write(filepath);
            SendFile(HttpContext.Current.Server.MapPath(filepath));
        }

        protected void SendFile(string AFileName)
        {
            if (AFileName == "")
            {
                System.Web.HttpContext.Current.Response.Clear();
                System.Web.HttpContext.Current.Response.Write("&nbsp;&nbsp;&nbsp;ERROR<hr />文件不存在或已被删除！ ");
                System.Web.HttpContext.Current.Response.End();
                return;
            }

            System.Web.HttpContext.Current.Response.Clear();
            SetContentType(AFileName);
            try
            {
                System.Web.HttpContext.Current.Response.WriteFile(AFileName);
            }
            catch { }
            System.Web.HttpContext.Current.Response.Cache.SetExpires(DateTime.Now.AddDays(7));
            System.Web.HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.Public);
            System.Web.HttpContext.Current.Response.End();
        }

        /// <summary>
        /// 设置输出类型
        /// </summary>
        /// <param name="fullfilepath"></param>
        protected void SetContentType(string fullfilepath)
        {
            string extFileName = Path.GetExtension(fullfilepath);

            string contentType = "image/jpeg";
            switch (extFileName.Trim().ToLower())
            {
                case ".jpg":
                    contentType = "image/jpeg";
                    break;
                case ".png":
                    contentType = "image/png";
                    break;
                case ".gif":
                    contentType = "image/gif";
                    break;
                case ".bmp":
                    contentType = "image/bmp";
                    break;
                case ".tif":
                    contentType = "image/tiff";
                    break;
            }

            System.Web.HttpContext.Current.Response.ContentType = contentType;
        }

        /// <summary>
        /// 检查是否存在该尺寸的缩略图
        /// </summary>
        /// <param name="itsize"></param>
        /// <param name="filepath"></param>
        /// <returns></returns>
        protected string CheckRequestSizeIsExists(string itsize, string filepath)
        {
            string _path = Path.Combine(config.webUpPath2, itsize);
            _path = Path.Combine(_path, filepath);

            if (File.Exists(HttpContext.Current.Server.MapPath(_path)))
            {
                return _path;
            }
            else
            {
                return "";
            }
        }

        /// <summary>
        /// 获取输出的文件路径
        /// </summary>
        /// <returns></returns>
        protected string GetFullFilePathByPath()
        {
            string _filepath = "";
            string ate_FilePath = Query.Get("image", "");

            //判断记录是否存在
            if (ate_FilePath != "")
            {
                //_filepath = Path.Combine(HttpContext.Current.Server.MapPath(config.webWatemarkUrl), ate_FilePath);
                _filepath = Path.Combine(config.webUpPath, _filepath);
                if (!File.Exists(HttpContext.Current.Server.MapPath(_filepath))) //水印图不存在，获取原图
                {
                    _filepath =  ate_FilePath;
                    _filepath = Path.Combine(config.webUpPath, _filepath);
                }

                //需要缩略图
                string itsize = Query.Get("itsize", "");
                if (Mtxfw.Utility.Common.Is_ThumbNail_AllowSizes(itsize)) //是否为允许的尺寸
                {
                    //获取已存在的缩略图
                    string existfilepath = CheckRequestSizeIsExists(itsize, ate_FilePath);

                    //没有该尺寸已生成好的图，创建缩略图
                    if (existfilepath == "")
                    {
                        int itql = Query.Get("itql", int.Parse(config.webWatemarkQuality));
                        string[] width_height = itsize.Split('x');
                        string saveFilePath = Path.Combine(config.webUpPath2, itsize);
                        saveFilePath = Path.Combine(saveFilePath, ate_FilePath);

                        string savepath = Path.GetDirectoryName(saveFilePath);
                        if (!Directory.Exists(HttpContext.Current.Server.MapPath(savepath)))
                        {
                            Directory.CreateDirectory(HttpContext.Current.Server.MapPath(savepath));
                        }

                        string oriFilePath = ate_FilePath;
                        oriFilePath = Path.Combine(config.webUpPath, oriFilePath);

                        Mtxfw.Utility.ImageManager.CutForCustom(HttpContext.Current.Server.MapPath(oriFilePath), HttpContext.Current.Server.MapPath(saveFilePath), Int32.Parse(width_height[0]), Int32.Parse(width_height[1]), itql);

                        return saveFilePath;    //返回新生成的缩位图
                    }
                    else
                    {
                        return existfilepath;   //返回已生成的缩位图
                    }
                }
            }

            return _filepath;   //返回原始图片
        }

        public bool IsReusable{get{return false;}}
    }
}