ajax图片上传

 1  <p>
 2     <label>ajax上传</label>
 3     <input type="file" name="fileToUpload" id="fileToUpload" class="inp_fileToUpload" multiple="multiple"/>
 4     <img src="$web.site$web.tpl#**#adminht/images/lb_head.jpg" width="30px" height="30px" class="img_upload" id="img" />
 5    </p>
 6    <p>
 7     <label>最新修改人员：</label>
 8     <input readonly="readonly" type="text" size="30" />
 9    </p>
10    <div>
11    
12     <script type="text/javascript">
13      $(function() {
14       $(".inp_fileToUpload").live("change", function() {//现在这个已经适用于多个file表单。
15        ajaxFileUpload($(this).attr("id"), $(this).parent().children(".img_upload").attr("id"));
16       })
17      })
18      function ajaxFileUpload(file_id, img_id) {
19       jQuery.ajaxFileUpload({
20        url : '/upload/upload_json.ashx', //用于文件上传的服务器端请求地址
21        secureuri : false, //是否需要安全协议，一般设置为false
22        fileElementId : file_id, //文件上传域的ID
23        dataType : 'json', //返回值类型 一般设置为json
24        success : function(data, status)//服务器成功响应处理函数
25        {
26         if (data.error == 0) {
27          $("#" + img_id).attr("src", data.url);
28         } else {
29          alert(data.message);
30         }
31        },
32        error : function(data, status, e)//服务器响应失败处理函数
33        {
34         alert(e);
35        }
36       })
37       return false;
38      }
39     </script>
40    </div>
41   </div>

 1 <%@ webhandler Language="C#" class="Upload" %>
 2 
 3 using System;
 4 using System.Collections;
 5 using System.Web;
 6 using System.IO;
 7 using System.Globalization;
 8 using LitJson;
 9 public class Upload : IHttpHandler
10 {
11  private HttpContext context;
12  public void ProcessRequest(HttpContext context)
13  {
14   String aspxUrl = context.Request.Path.Substring(0, context.Request.Path.LastIndexOf("/") + 1);
15  
16   //文件保存目录路径
17   String savePath = "attached/";
18   //文件保存目录URL
19   String saveUrl = aspxUrl + "attached/";
20   //定义允许上传的文件扩展名
21   Hashtable extTable = new Hashtable();
22   extTable.Add("image", "gif,jpg,jpeg,png,bmp");
23   extTable.Add("flash", "swf,flv");
24   extTable.Add("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
25   extTable.Add("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");
26   //最大文件大小
27   int maxSize = 1000000;
28   this.context = context;
29   HttpPostedFile imgFile = context.Request.Files["imgFile"];
30   if (imgFile == null)
31   {
32    showError("请选择文件。");
33   }
34   String dirPath = context.Server.MapPath(savePath);
35   if (!Directory.Exists(dirPath))
36   {
37    showError("上传目录不存在。");
38   }
39   String dirName = context.Request.QueryString["dir"];
40   if (String.IsNullOrEmpty(dirName)) {
41    dirName = "image";
42   }
43   if (!extTable.ContainsKey(dirName)) {
44    showError("目录名不正确。");
45   }
46   String fileName = imgFile.FileName;
47   String fileExt = Path.GetExtension(fileName).ToLower();
48   if (imgFile.InputStream == null || imgFile.InputStream.Length > maxSize)
49   {
50    showError("上传文件大小超过限制。");
51   }
52   if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(((String)extTable[dirName]).Split(','), fileExt.Substring(1).ToLower()) == -1)
53   {
54    showError("上传文件扩展名是不允许的扩展名。\n只允许" + ((String)extTable[dirName]) + "格式。");
55   }
56   //创建文件夹
57   dirPath += dirName + "/";
58   saveUrl += dirName + "/";
59   if (!Directory.Exists(dirPath)) {
60    Directory.CreateDirectory(dirPath);
61   }
62   String ymd = DateTime.Now.ToString("yyyyMMdd", DateTimeFormatInfo.InvariantInfo);
63   dirPath += ymd + "/";
64   saveUrl += ymd + "/";
65   if (!Directory.Exists(dirPath)) {
66    Directory.CreateDirectory(dirPath);
67   }
68   String newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", DateTimeFormatInfo.InvariantInfo) + fileExt;
69   String filePath = dirPath + newFileName;
70   imgFile.SaveAs(filePath);
71   String fileUrl = saveUrl + newFileName;
72   Hashtable hash = new Hashtable();
73   hash["error"] = 0;
74   hash["url"] = fileUrl;
75   context.Response.AddHeader("Content-Type", "text/html; charset=UTF-8");
76   context.Response.Write(JsonMapper.ToJson(hash));
77   context.Response.End();
78  }
79  private void showError(string message)
80  {
81   Hashtable hash = new Hashtable();
82   hash["error"] = 1;
83   hash["message"] = message;
84   context.Response.AddHeader("Content-Type", "text/html; charset=UTF-8");
85   context.Response.Write(JsonMapper.ToJson(hash));
86   context.Response.End();
87  }
88  public bool IsReusable
89  {
90   get
91   {
92    return true;
93   }
94  }
95 }