关于post文件上传不能返回路径问题的解决方案

一般文件上采用表单提交，设置form的两个属性 method="post"   enctype=”multipart/form-data”

如：

<form method="post"action="http://w.sohu.com/t2/upload.do" enctype=”multipart/form-data”>

         <inputtype="text" name="desc">

         <inputtype="file" name="pic">

 </form>

但附件上传要返回附件的上传地址

由于post提交为同步提交，所以不能回掉附件的URL地址，有人可能会想到ajaxs,但是ajaxs不能设置enctype属性值,所以不能进行附件上传，

终于，发现了问题的解决方法那就是 ajaxFileUpload

只要jsp中导入ajaxFileUpload的js

然后js中

  $.ajaxFileUpload
            (
                {
                    url: '<%=appPath%>/Resource/jsp/fileUp.jsp', //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: 'file1', //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
                    {
                        urlUpload = data.url;
                        $("#url").val(urlUpload);
                        upload();
                    },
                    error: function (data, status, e)//服务器响应失败处理函数
                    {
                        alert(e);
                    }
                }
            )

就可以了，哦对了还要改下ajaxFileUpload的js源码

 uploadHttpData: function( r, type ) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        // If the type is "script", eval it in global context
        if ( type == "script" )
            jQuery.globalEval( data );
        // Get the JavaScript object, if JSON is used.
        if ( type == "json" )
        {
            /*// If you add mimetype in your response,
            // you have to delete the '<pre></pre>' tag.
            // The pre tag in Chrome has attribute, so have to use regex to remove
            var data = r.responseText;
            var rx = new RegExp("<pre.*?>(.*?)</pre>","i");
            var am = rx.exec(data);
            //this is the desired data extracted
            var data = (am) ? am[1] : "";    //the only submatch or empty
            eval( "data = " + data );*/
            data=eval("("+data.replace("<pre>","").replace("</pre>","")+")");
        }
        // evaluate scripts within html
        if ( type == "html" )
            jQuery("<div>").html(data).evalScripts();
        //alert($('param', data).each(function(){alert($(this).attr('value'));}));
        return data;
    }

对于IE9 ，IE10浏览器存在不兼容问题，可修改ajaxFileUpload.js文件

// JavaScript DocumentjQuery.extend({    createUploadIframe: function(id, uri) {   //create frame            var frameId = 'jUploadFrame' + id;                        if(window.ActiveXObject) {            if(jQuery.browser.version=="9.0" || jQuery.browser.version=="10.0"){    var io = document.createElement('iframe');    io.id = frameId;    io.name = frameId;    }else if(jQuery.browser.version=="6.0" || jQuery.browser.version=="7.0" || jQuery.browser.version=="8.0"){     var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');     if(typeof uri== 'boolean'){     io.src = 'javascript:false';     }     else if(typeof uri== 'string'){     io.src = uri;     }    }            }            else {                var io = document.createElement('iframe');                io.id = frameId;                io.name = frameId;            }            io.style.position = 'absolute';            io.style.top = '-1000px';            io.style.left = '-1000px';            document.body.appendChild(io);            return io;       },    createUploadForm: function(id, fileElementId) {  //create form   var formId = 'jUploadForm' + id;  var fileId = 'jUploadFile' + id;  var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');   var oldElement = jQuery('#' + fileElementId);  var newElement = jQuery(oldElement).clone();  jQuery(oldElement).attr('id', fileId);  jQuery(oldElement).before(newElement);  jQuery(oldElement).appendTo(form);  //set attributes  jQuery(form).css('position', 'absolute');  jQuery(form).css('top', '-1200px');  jQuery(form).css('left', '-1200px');  jQuery(form).appendTo('body');    return form;    },    ajaxFileUpload: function(s) {        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout          s = jQuery.extend({}, jQuery.ajaxSettings, s);        var id = s.fileElementId;          var form = jQuery.createUploadForm(id, s.fileElementId);  var io = jQuery.createUploadIframe(id, s.secureuri);  var frameId = 'jUploadFrame' + id;  var formId = 'jUploadForm' + id;                  if( s.global && ! jQuery.active++ )  {   // Watch for a new set of requests   jQuery.event.trigger( "ajaxStart" );  }                    var requestDone = false;        // Create the request object        var xml = {};           if( s.global )        {         jQuery.event.trigger("ajaxSend", [xml, s]);        }                            var uploadCallback = function(isTimeout)  {     // Wait for a response to come back    var io = document.getElementById(frameId);            try    {        if(io.contentWindow)    {      xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;                  xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;          }else if(io.contentDocument)    {      xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;                 xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;    }                  }catch(e)   {    jQuery.handleError(s, xml, null, e);   }            if( xml || isTimeout == "timeout")    {                    requestDone = true;                var status;                try {                    status = isTimeout != "timeout" ? "success" : "error";                    // Make sure that the request was successful or notmodified                    if( status != "error" )     {                        // process the data (runs the xml through httpData regardless of callback)                        var data = jQuery.uploadHttpData( xml, s.dataType );                                                if( s.success )                        {       // ifa local callback was specified, fire it and pass it the data                         s.success( data, status );                        };                                         if( s.global )                        {       // Fire the global callback                         jQuery.event.trigger( "ajaxSuccess", [xml, s] );                        };                                                } else                    {                     jQuery.handleError(s, xml, status);                    }                                        } catch(e)     {                    status = "error";                    jQuery.handleError(s, xml, status, e);                };                                if( s.global )                {     // The request was completed                 jQuery.event.trigger( "ajaxComplete", [xml, s] );                };                                    // Handle the global AJAX counter                if(s.global && ! --jQuery.active)                {                 jQuery.event.trigger("ajaxStop");                };                if(s.complete)                {                  s.complete(xml, status);                } ;                                 jQuery(io).unbind();                setTimeout(function()         { try           {           jQuery(io).remove();           jQuery(form).remove();                      } catch(e)           {           jQuery.handleError(s, xml, null, e);          }                  }, 100);                xml = null;            };        }        // Timeout checker        if( s.timeout > 0 )   {            setTimeout(function(){                                if( !requestDone )                {     // Check to see ifthe request is still happening                 uploadCallback( "timeout" );                }                            }, s.timeout);        }        try   {   var form = jQuery('#' + formId);   jQuery(form).attr('action', s.url);   jQuery(form).attr('method', 'POST');   jQuery(form).attr('target', frameId);            if(form.encoding)   {                form.encoding = 'multipart/form-data';                }            else   {                    form.enctype = 'multipart/form-data';            }               jQuery(form).submit();        } catch(e)   {               jQuery.handleError(s, xml, null, e);        }        if(window.attachEvent){            document.getElementById(frameId).attachEvent('onload', uploadCallback);        }        else{            document.getElementById(frameId).addEventListener('load', uploadCallback, false);        }           return {abort: function () {}};     },    uploadHttpData: function( r, type ) {        var data = !type;        data = type == "xml" || data ? r.responseXML : r.responseText;        // ifthe type is "script", eval it in global context        if( type == "script" )        {         jQuery.globalEval( data );        }                    // Get the JavaScript object, ifJSON is used.        if( type == "json" )        {         eval( "data = " + data );        }                    // evaluate scripts within html        if( type == "html" )        {         jQuery("<div>").html(data).evalScripts();        }                    return data;    }});