前段时间介绍过jquery uploadify上传插件的使用方法，我在使用中遇到过Http Error 302错误问题，应该会有很多人在使用中遇到过，在此记录下来：

首先http 302是请求被重定向的意思，这就很容易理解了，如果你的uploadify处理上传脚本有session验证，就会出现此错误，因为flash在执行post请求的时候没有包含cookie信息，而服务器的session会根据客户端的cookie来得到SESSIONID。没有提交cookie自然就不能获取到session，然后uploadify就返回了302(请求被重定向)的错误。

解决办法当然是把session_id的值传到服务端：

<ｓｃｒｉｐｔ>$(document).ready(function() {    $('#file_upload').uploadify({     'uploader' : 'uploadify/uploadify.swf',     'ｓｃｒｉｐｔ'  : 'uploadify.php',    'folder'  : 'uploads/file',     'formData': { 'session': '<&#63;php echo session_id();&#63;>'},     'onComplete' : function(event, ID, fileObj, response, data) {      alert(response);     }    }); }); </ｓｃｒｉｐｔ> 

然后在服务器端session验证之前：

if (isset($_POST['session'])){   session_id($_POST['session']);   session_start();//注意此函数要在session_id之后 } 

当然，你也可以直接在url中将session id传过去。

yii中代码如下：

$('#<&#63;php echo $upload_name_id;&#63;>').uploadify({      'buttonText': '选择文件..',      'fileObjName': 'imgFile',      'method': 'post',      'multi': false,      'queueID': 'fileQueue',      /*'uploadLimit': 2,*/      'fileTypeExts': '*.gif;*.png;*.jpg;*.bmp;*.jpeg;',      'buttonImage': '<&#63;php echo $this->_static_public&#63;>/js/uploadify/ｓｅｌｅｃｔ.png',      'formData': {        'sessionId'  : '<&#63;php echo Yii::app()->session->sessionID; &#63;>',        'timestamp'  : '<&#63;php echo time();&#63;>',        'token'    : '<&#63;php echo md5('unique_salt'.time()); &#63;>',        'modelName' : '<&#63;php echo $modelName; &#63;>',        'modelId' : '<&#63;php echo $model->id; &#63;>'      },      'swf': '<&#63;php echo $this->_static_public;&#63;>/js/uploadify/uploadify.swf',      'uploader': '<&#63;php echo $this->createUrl('uploadify/basicexecute')&#63;>',      'onUploadStart': function () {        $('#<&#63;php echo $up_upload_name_id;&#63;> img').remove();        $('#<&#63;php echo $up_upload_name_id;&#63;> a').remove();        $imgHtml = '<img  class="upload_load" src="static/images/upload.gif" align="absmiddle" / alt="jQuery Uploadify 上传插件出现Http Error 302 错误的解决办法_jquery" >';        $('#<&#63;php echo $up_upload_name_id;&#63;>').append($imgHtml);      },        'onUploadSuccess': function(file, data, response) {        $('.upload_load').remove();         var json = $.parseJSON(data);         if (json.state == 'success') {          $("#<&#63;php echo $d_upload_name_id;&#63;>").remove();          $(yt_upload_name_id).val(json.fileId);          $imgHtml ='<p id="<&#63;php echo $d_upload_name_id;&#63;>">';                    $imgHtml += '<a href="<&#63;php echo $this->_baseUrl&#63;>/' + json.file + '" target="_blank">';          $imgHtml += '<img  src="<&#63;php echo $this- alt="jQuery Uploadify 上传插件出现Http Error 302 错误的解决办法_jquery" >_baseUrl&#63;>/'+json.file+'" width="85"    style="max-width:90%" align="absmiddle"/>';          $imgHtml += '</a>';          $imgHtml += '<a href="javascript:uploadifyRemove("' + json.fileId + '","<&#63;php echo $d_upload_name_id;&#63;>","<&#63;php echo $yt_upload_name_id;&#63;>")">删除</a>';          $imgHtml +='</p>';          $('#<&#63;php echo $up_upload_name_id;&#63;>').append($imgHtml);        } else {          alert(json.message);        }      },      'onQueueComplete':function () {        $('.upload_load').remove();      }    }); 

服务端：

if (isset($_POST['sessionId'])) {  $session = Yii::app()->getSession();  $session->close();  $session->sessionID = $_POST['sessionId'];  $session->open();}

ps：jquery上传插件uploadify使用心得(总结)

自己使用实例：

1、jsp页面：

<link href="jsp/js/jquery_upload/uploadify.css" rel="stylesheet" type="text/css" /><ｓｃｒｉｐｔ type="text/javascript" src="jsp/js/jquery-1.4.2.min.js"></ｓｃｒｉｐｔ><ｓｃｒｉｐｔ type="text/javascript" src="jsp/js/jquery_upload/swfobject.js"></ｓｃｒｉｐｔ><ｓｃｒｉｐｔ type="text/javascript" src="jsp/js/jquery_upload/jquery.uploadify.v2.1.4.min.js"></ｓｃｒｉｐｔ>//jquery文件上传$(document).ready(function()    {      $("#uploadify").uploadify({        'uploader': 'jsp/js/jquery_upload/uploadify.swf',        'ｓｃｒｉｐｔ': 'uploadFile.svl',        'cancelImg': 'jsp/js/jquery_upload/cancel.png',        'queueID': 'fileQueue',        'auto': false,        'multi': true,        'method':'POST',        'scriptData':{'saveFolder':'stuPhotos'},//GET方式才可生效        'fileExt' :'*.jpg;*.gif;*.png', //控制可上传文件的扩展名        'fileDesc': 'jpg、gif、png文件', //控制可上传文件的扩展名描述，两者需要同时使用         'buttonImg':'jsp/js/jquery_upload/selectBtn.gif',        'width':80,//"浏览"按钮宽度        'onComplete':function(event,ID,fileObj,response,data){         //alert(response) //response为服务器响应数据        },      });}); <td width="200" class="tabIndex" style="height:10px">照片：</td><td><input type="file" name="uploadify" id="uploadify" /><p><a href="javascript:$('#uploadify').uploadifyUpload()">上传</a>| <a href="javascript:$('#uploadify').uploadifyclearQueue()">取消上传</a></p><p id="fileQueue" ></p><input type="hidden" name="stuPhoto" id="stuPhoto" /></td>

2、服务端代码

public class UploadFileUtil extends Httpservlet {private static final long serialVersionUID = 1L;File tmpDir = null;// 初始化上传文件的临时存放目录File saveDir = null;// 初始化上传文件后的保存目录public UploadFileUtil() {super();}protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  try{    if(ServletFileUpload.isMultipartContent(request)){     response.setCharacterEncoding("utf-8");//务必，防止返回文件名是乱码      DiskFileItemFactory dff = new DiskFileItemFactory();//创建该对象     dff.setRepository(tmpDir);//指定上传文件的临时目录     dff.setSizeThreshold(1024000);//指定在内存中缓存数据大小,单位为byte     ServletFileUpload sfu = new ServletFileUpload(dff);//创建该对象     sfu.setFileSizeMax(5000000);//指定单个上传文件的最大尺寸     sfu.setSizeMax(10000000);//指定一次上传多个文件的总尺寸     FileItemIterator fii = sfu.getItemIterator(request);//解析request 请求,并返回FileItemIterator集合     while(fii.hasNext()){      FileItemStream fis = fii.next();//从集合中获得一个文件流      if(!fis.isFormField() && fis.getName().length()>0){//过滤掉表单中非文件域       String fileName = fis.getName();//获取文件名       String extName = "";       if (fileName.lastIndexOf(".") >= 0) {extName = fileName.substring(fileName.lastIndexOf("."));}        BufferedInputStream in = new BufferedInputStream(fis.openStream());//获得文件输入流        String uuidName = UUID.randomUUID().toString().replaceAll("-", "").toUpperCase();//用UUID生成文件名        BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(new File(saveDir+"/"+uuidName+extName)));//获得文件输出流        Streams.copy(in, out, true);//开始把文件写到你指定的上传文件夹      }     }     //jquery上传方式返回     response.getWriter().print("upload success");//成功    }  }catch(Exception e){   response.getWriter().print("upload fail");//失败    e.printStackTrace();  } } public void init() throws ServletException {  super.init();  String serverPath = this.getServletConfig().getServletContext().getRealPath("/");//获取服务器路径   String tmpPath = serverPath+"/tmpUploadsFolder/";   String savePath = serverPath+"/uploadsFolder/";  tmpDir = new File(tmpPath);  saveDir = new File(savePath);  if(!tmpDir.isDirectory())    tmpDir.mkdir();  if(!saveDir.isDirectory())    saveDir.mkdir(); }}