今天笔者需要一款图片上传插件，但是网上没有提供一款符合自己需求且好用的。于是就自己动手写了一个。
<p> <label>上传图片</label> <input class="ke-input-text" type="text" id="url" value="" readonly="readonly" /> <input type="button" id="uploadButton" value="Upload" /> </p> <script type="text/javascript"> $(function() { $('.inp_fileToUpload').change(function() { var formdata = new FormData(); var v_this = $(this); var fileObj = v_this.get(0).files; url = "/upload/upload_json.ashx"; //var fileObj=document.getElementById("fileToUpload").files; formdata.append("imgFile",fileObj[0]); jQuery.ajax({ url : url,type : 'post',data : formdata,cache : false,contentType : false,processData : false,dataType : "json",success : function(data) { if (data.error == 0) { v_this.parent().children(".img_upload").attr("src",data.url); //$("#img").attr("src",data.url); } } }); return false; }); }); </script>
这种方法的缺点：由于IE6\8\9\不支持formdata，所以这种方法不支持IE9及以下版本
<p>
<label>ajax上传</label>
<input type="file" name="fileToUpload" id="fileToUpload" class="inp_fileToUpload" multiple="multiple"/>
<img src="$web.site$web.tpl#**#adminht/images/lb_head.jpg" width="30px" height="30px" class="img_upload" id="img" />
</p>
<p>
<label>最新修改人员：</label>
<input readonly="readonly" type="text" size="30" />
</p>
<div>
<script type="text/javascript">
$(function() {
$(".inp_fileToUpload").live("change",function() {//现在这个已经适用于多个file表单。
ajaxFileUpload($(this).attr("id"),$(this).parent().children(".img_upload").attr("id"));
})
})
function ajaxFileUpload(file_id,img_id) {
jQuery.ajaxFileUpload({
url : '/upload/upload_json.ashx',//用于文件上传的服务器端请求地址
secureuri : false,//是否需要安全协议，一般设置为false
fileElementId : file_id,//文件上传域的ID
dataType : 'json',//返回值类型 一般设置为json
success : function(data,status)//服务器成功响应处理函数
{
if (data.error == 0) {
$("#" + img_id).attr("src",data.url);
} else {
alert(data.message);
}
},error : function(data,status,e)//服务器响应失败处理函数
{
alert(e);
}
})
return false;
}
</script>
</div>
</div>
说明：这种方法目前测试支持IE8/9,谷歌，兼容比方法1好。建议采用方法2
<%@ webhandler Language="C#" class="Upload" %>
using System;
using System.Collections;
using System.Web;
using System.IO;
using System.Globalization;
using LitJson;
public class Upload : IHttpHandler
{
private HttpContext context;
public void ProcessRequest(HttpContext context)
{
String aspxUrl = context.Request.Path.Substring(0,context.Request.Path.LastIndexOf("/") + 1);
//文件保存目录路径
String savePath = "attached/";
//文件保存目录URL
String saveUrl = aspxUrl + "attached/";
//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",flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
extTable.Add("file","doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");
//最大文件大小
int maxSize = 1000000;
this.context = context;
HttpPostedFile imgFile = context.Request.Files["imgFile"];
if (imgFile == null)
{
showError("请选择文件。");
}
String dirPath = context.Server.MapPath(savePath);
if (!Directory.Exists(dirPath))
{
showError("上传目录不存在。");
}
String dirName = context.Request.QueryString["dir"];
if (String.IsNullOrEmpty(dirName)) {
dirName = "image";
}
if (!extTable.ContainsKey(dirName)) {
showError("目录名不正确。");
}
String fileName = imgFile.FileName;
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。");
}
if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(((String)extTable[dirName]).Split(','),fileExt.Substring(1).ToLower()) == -1)
{
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。");
}
//创建文件夹
dirPath += dirName + "/";
saveUrl += dirName + "/";
if (!Directory.Exists(dirPath)) {
Directory.CreateDirectory(dirPath);
}
String ymd = DateTime.Now.ToString("yyyyMMdd",DateTimeFormatInfo.InvariantInfo);
dirPath += ymd + "/";
saveUrl += ymd + "/";
if (!Directory.Exists(dirPath)) {
Directory.CreateDirectory(dirPath);
}
String newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff",DateTimeFormatInfo.InvariantInfo) + fileExt;
String filePath = dirPath + newFileName;
imgFile.SaveAs(filePath);
String fileUrl = saveUrl + newFileName;
Hashtable hash = new Hashtable();
hash["error"] = 0;
hash["url"] = fileUrl;
context.Response.AddHeader("Content-Type","text/html; charset=UTF-8");
context.Response.Write(JsonMapper.ToJson(hash));
context.Response.End();
}
private void showError(string message)
{
Hashtable hash = new Hashtable();
hash["error"] = 1;
hash["message"] = message;
context.Response.AddHeader("Content-Type","text/html; charset=UTF-8");
context.Response.Write(JsonMapper.ToJson(hash));
context.Response.End();
}
public bool IsReusable
{
get
{
return true;
}
}
}
