ImportFileHandler 附件上传

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using LitJson;
using LY.CCPC.Model;
using System.IO;
using System.Reflection;
using System.Data;
using System.Configuration;
using System.Collections.Specialized;
using LY.CCPC.BLL;
using LY.CCPCUEP.Utility;


namespace LY.CCPCUEP.UI.Handlers
{
    /// <summary>
    /// ImportFileHandler 的摘要说明
    /// </summary>
    public class ImportFileHandler : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            JsonObject json = new JsonObject() { Success = true };
             
            string fullMethod = context.Request.QueryString["mod"];
            string strType = context.Request.QueryString["type"];
            string fullFileName = string.Empty;
            FTPHelper ftp=getFtpPath();
            try
            {
                HttpFileCollection fileColl = context.Request.Files;
                string empid = context.User.Identity.Name;
                if ("UPLOAD".Equals(fullMethod.ToUpper()))
                {
                    HttpPostedFile file = fileColl[0];//得到上传的文件

                    //1.判断文件扩展名是否符合要求
                    string org_file_name = getOrgFileName(file.FileName);//初始文件名
                    string ext = getFileExtName(file.FileName);
                    ext = ext.ToLower();
                    string[] exts = new string[] { ".jpg", ".ppt", ".pptx", ".bmp", ".gif", ".png", ".jpeg", ".txt", ".csv", ".xls", ".xlsx", ".doc", ".docx", ".pdf", ".avi ", ".rmvb ", ".rm ", ".asf ", ".divx ", ".mpg ", ".mpeg ", ".mpe ", ".wmv ", ".mp4 ", ".mkv ", ".vob", ".rar", ".zip" };
                    if (!exts.Contains(ext))
                    {
                        json.Success = false;
                        json.Data = "";
                        json.Message = string.Format("系统不允许上传类型为{0}的文件，请重新选择上传！", ext);
                        // context.Response.Write(JsonMapper.ToJson(json));
                        return;
                    }

                    //2.判断文件大小，不能超过5MB
                    int fileSize = file.ContentLength;
                    const int MB = 1024 * 1024;

                    if (fileSize / MB >= 5)
                    {
                        json.Success = false;
                        json.Data = "";
                        json.Message = "上传的文件不能超过5MB，请重新选择上传！";
                        //context.Response.Write(JsonMapper.ToJson(json));
                        return;
                    }

                    string filePath = this.getLocalPath("1");
                    string uploadPath = context.Server.MapPath("~" + filePath) ;//导入文件路径
                    string fileName = "";

                    fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff")+ ext;//文件名
                    if (!Directory.Exists(uploadPath))
                    {
                        Directory.CreateDirectory(uploadPath);
                    }                     
                      fullFileName = uploadPath +"\"+ fileName;
                    file.SaveAs(fullFileName);//文件在服务器的全路径
                 
                    ftp.Upload(fullFileName); // 上传到FTP服务器
                    string  file_path =  ftp.ftpRemotePath.Substring(ftp.ftpRemotePath.IndexOf('/')) ;//保存在服务器的路径
                    string org_file_path = (file_path + "\" + fileName).Replace("\", "/");
                    org_file_name = org_file_name.Substring(org_file_name.LastIndexOf("\") + 1);
                    string strMsg = "{"file_path":""+org_file_path+"","file_name":""+org_file_name+""}";
                    //string strMsg = string.Format("[{"file_path":"{0}"},{"file_name":"{1}"}]", , );
                    json.Data = strMsg;
                    
                }
            }
            catch (Exception ex)
            {
                json.Success = false;
                json.Message = ex.Message;
                json.Data = ex.Message + "###上传FTP路径：" + ftp.ftpURI;
            }
            finally
            {
                string result = JsonMapper.ToJson(json);
                //删除AP上的临时文件
                if (File.Exists(fullFileName))
                {
                    File.Delete(fullFileName);
                }       
                context.Response.Write(result);
                context.Response.End();
            }
        }

        private string getLocalPath(string flag)
        {
            string path = string.Empty;

            string ftpPath = ConfigurationManager.AppSettings["FTP"];
            string filePath = ConfigurationManager.AppSettings["uploadPath"];
            string ImportPath = ConfigurationManager.AppSettings["ImportPath"];
            string ExportPath = ConfigurationManager.AppSettings["ExportPath"];
            if ("1".Equals(flag))
            {
                path = ftpPath + filePath;
            }
            else if ("2".Equals(flag))
            {
                path = ftpPath + ImportPath;
            }
            else if ("3".Equals(flag))
            {
                path = ftpPath + ExportPath;
            }
            return path;
        }
        /// <summary>
        /// 返回FTP对像
        /// </summary>
        /// <returns></returns>
        private FTPHelper getFtpPath()
        {
            
            string ftpPath = ConfigurationManager.AppSettings["FTPServer"];
            string filePath = ConfigurationManager.AppSettings["FTPPath"];
            string ftpUser = ConfigurationManager.AppSettings["FTPUser"];
            string ftpPass = ConfigurationManager.AppSettings["FTPPass"];
           
            return new FTPHelper(ftpPath,filePath,ftpUser,ftpPass);
        }

        /// <summary>
        /// 获取文件扩展名
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        private string getFileExtName(string fileName)
        {
            if (string.IsNullOrEmpty(fileName)) return string.Empty;
            if (!fileName.Contains(".")) return fileName;
            int posIndex = fileName.LastIndexOf('.');
            return fileName.Substring(posIndex);
        }
        /// <summary>
        /// 获取文件原始名
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        private string getOrgFileName(string fileName)
        {
            if (string.IsNullOrEmpty(fileName)) return string.Empty;
            if (!fileName.Contains("/")) 
                return fileName;
            int posIndex = fileName.LastIndexOf('/')+1;
            return fileName.Substring(posIndex);
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
         
    }
}