spring-mvc使用ajaxFileUpload上传文件总是进入error方法

改变其中的js部分：

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")
// eval( "data = " + data );
// data会被加<pre>导致AJAX不走success方法,改为如下形式
// eval("data = \" "+data+" \" ");
data = jQuery.parseJSON(data);
// evaluate scripts within html
if (type == "html")
jQuery("<div>").html(data).find('script').remove();
return data;
},

另外附上源代码：

jQuery.extend({
createUploadIframe : function(id, uri) {
// create frame
var frameId = 'jUploadFrame' + id;
var iframeHtml = '<iframe id="'
+ frameId
+ '" name="'
+ frameId
+ '" style="position:absolute; top:-9999px; left:-9999px"';
if (window.ActiveXObject) {
if (typeof uri == 'boolean') {
iframeHtml += ' src="' + 'javascript:false' + '"';
} else if (typeof uri == 'string') {
iframeHtml += ' src="' + uri + '"';
}
}
iframeHtml += ' />';
jQuery(iframeHtml).appendTo(document.body);
return jQuery('#' + frameId).get(0);
},
createUploadForm : function(id, fileElementId, data) {
// 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>');
// Handle files
if (typeof (fileElementId) == "string") {
fileElementId = [ fileElementId ];
}
for ( var i in fileElementId) {
var oldElement = jQuery('#' + fileElementId[i]);
var newElement = jQuery(oldElement).clone();
jQuery(oldElement).attr('id', fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
}
// Handle data
if (data) {
for ( var i in data) {
jQuery(
'<textarea name="' + i
+ '" style="display:none;">' + data[i]
+ '</textarea>').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) {
// introduce global settings, allowing the client to modify them
// for all requests, not only timeout
s = jQuery.extend({}, jQuery.ajaxSettings, s);
var id = new Date().getTime();
var form = jQuery.createUploadForm(id, s.fileElementId,
(typeof (s.data) == 'undefined' ? false : s.data));
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;
// Watch for a new set of requests
if (s.global && !jQuery.active++) {
jQuery.event.trigger("ajaxStart");
}
var requestDone = false;
// Create the request object
var xml = {};
if (s.global)
jQuery.event.trigger("ajaxSend", [ xml, s ]);
// Wait for a response to come back
var uploadCallback = function(isTimeout) {
var io = document.getElementById(frameId);
try {
if (io.contentWindow) {
xml.responseText = io.contentWindow.document.body ? jQuery(
'<div>').html(
io.contentWindow.document.body.innerHTML)
.text()
: null;
xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument
: io.contentWindow.document;
} else if (io.contentDocument) {
xml.responseText = io.contentWindow.document.body ? jQuery(
'<div>').html(
io.contentWindow.document.body.innerHTML)
.text()
: 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 a local callback was specified, fire it
// and pass it the data
if (s.success)
s.success(data, status);
// Fire the global callback
if (s.global)
jQuery.event.trigger("ajaxSuccess", [ xml,
s ]);
} else
jQuery.handleError(s, xml, status);
} catch (e) {
status = "error";
jQuery.handleError(s, xml, status, e);
}
// The request was completed
if (s.global)
jQuery.event.trigger("ajaxComplete", [ xml, s ]);
// Handle the global AJAX counter
if (s.global && !--jQuery.active)
jQuery.event.trigger("ajaxStop");
// Process result
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() {
// Check to see if the request is still happening
if (!requestDone)
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) {
jQuery(form).attr('encoding', 'multipart/form-data');
} else {
jQuery(form).attr('enctype', 'multipart/form-data');
}
jQuery(form).submit();

} catch (e) {
jQuery.handleError(s, xml, null, e);
}
jQuery('#' + frameId).load(uploadCallback);
return {
abort : function() {
}
};
},
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")
// eval( "data = " + data );
// data会被加<pre>导致AJAX不走success方法,改为如下形式
// eval("data = \" "+data+" \" ");
data = jQuery.parseJSON(data);
// evaluate scripts within html
if (type == "html")
jQuery("<div>").html(data).find('script').remove();
return data;
},
handleError : function(s, xml, status, e) {
// If a local callback was specified, fire it
if (s.error)
s.error(xml, status, e);
// Fire the global callback
if (s.global)
jQuery.event.trigger("ajaxError", [ xml, s, e ]);
}
});