upload_json.ashx

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<%@ WebHandler Language="C#" Class="upload_json" %>

using System;
using System.Collections;
using System.Globalization;
using System.Web;
using System.IO;
using LitJson;

public class upload_json : IHttpHandler
{
    private HttpContext context;
    public void ProcessRequest(HttpContext context)
    {
        string fileUrl = "";
        try
        {
            string aspxUrl = context.Request.Path.Substring(0, context.Request.Path.LastIndexOf("/") + 1);
            //文件保存目录路径
            string savePath = "~/FileUpload/";
            //文件保存目录URL，以便前端显示
            string showUrl = aspxUrl + "FileUpload/";

            //定义允许上传的文件扩展名
            Hashtable extTable = new Hashtable();
            extTable.Add("image", "gif,jpg,jpeg,png,bmp");
            extTable.Add("flash", "swf,flv");
            extTable.Add("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
            extTable.Add("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar");

            //定义允许上传文件的最大大小
            int maxSize = 1000000;
            this.context = context;
            HttpPostedFile imgFile = context.Request.Files["imgFile"];
            if (imgFile == null)
            {
                ShowError("请选择文件。");
                return;
            }

            string dirPath = context.Server.MapPath(savePath);
            if (!Directory.Exists(dirPath))
            {
                ShowError("上传目录不存在。");
                return;
            }

            string dirName = PageOperate.GetNullToString(context.Request.QueryString["dir"]);
            if (!extTable.ContainsKey(dirName))
            {
                ShowError("目录名不正确。");
                return;
            }

            string fileName = PageOperate.GetNullToString(imgFile.FileName);
            //获取文件后缀名
            string fileExt = Path.GetExtension(fileName).ToLower();
            if (imgFile.InputStream == null || imgFile.InputStream.Length > maxSize)
            {
                ShowError("上传文件大小超过限制。");