ajaxfileupload跨域文件上传会遇到2个问题
1：跨域访问以json，xml格式返回，直接报406
网上查了设置服务器端直接设置header内容Access-Control-Allow-Origin：*
或者
Access-Control-Allow-Origin：www.test.com
起不到作用还是报406
2：跨域获取不到 body中的返回值
ajaxfileupload是通过iframe提交post表单形式实现异步不跳转上传，把值赋值在iframe 中的body标签。如果不涉及到跨域是直接能通过ajaxfileupload.js 92行
io.contentWindow.document.body 或则 io.contentWindow.document.XMLDocument 获取异步返回的值
但是一旦涉及到跨域访问，主流浏览器都是禁止获取值，就算是同域，如localhost:8080 与localhost:8088一样你也获取不到值，真气人啊哈哈。
不过你可以在chrom的debug模式中 敲打 io 能观察到是有返回值的，但是你就是获取不到，浏览器直接抛异常。
原理 详见 http://blog.csdn.net/joyhen/article/details/21631833
目前这个跨域解决方法，只适合主域相同，二级域名不同，或者端口号不同的业务场景，实现页面完全跨域，貌似目前官方也没给出完整方案，这涉及到网页安全问题了。
一.controller层
@RequestMapping(value = "upload.json", method = RequestMethod.POST)
public @ResponseBody Object
upload(/*@RequestParam MultipartFile file,*/
@RequestParam(value = "uploadType", required = false) String uploadType,
HttpServletRequest request, HttpServletResponse response) {
//1.解决跨域访问domain localhost
String damain = "localhost";
String setDomain = "<script>document.domain = \""+damain+"\";</script>";
//2.获取上传文件MultipartFile流对象
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;
Iterator<String> iter = multiRequest.getFileNames();
MultipartFile studentPhoto = null;
while(iter.hasNext()){
studentPhoto = multiRequest.getFile(iter.next());
}
//获取流之后就不要我说了吧，跨域返回 json，xml格式 报406错误 所以返回字符串没问题，如果哪位大神有好的解决方案可以留言
return "文件名称"
}
二. JSP：页面
<div class="aboutBox">
<div >
<p><span>身份证正面：</span>
<span >
<a href="#">选择照片</a>
<input type="file" id="studentPhoto" name="studentPhoto" />
<input type="hidden" value="" id="cardnoPosUrl" name="cardnoPosUrl" />
</span>
</p>
<img src="" id="cardnoPosUrlShow" alt="">
</div>
</div>
三.封装ajaxfileupload 支持单页多图上传
//调用uploadCommon.js
$(".aboutBox").delegate("#studentPhoto","change",function() {
UploadifyFileCommon.uploadOneImage("studentPhoto","cardnoPosUrlShow",'cardnoPosUrl',"personal");
});
//上传图片封装方法 uploadCommon.js
var UploadifyFileCommon = {
/**
* @param FileDivId 上传文件的File 如：<input type="file" id="file" name="file" />
* @param showUrlId 显示图片的img 如： <img src="" id="showImg" alt="">
* @param saveUrlId 保存图片的相对路径 如：/enterprise/1232122.jpg
* @param uploadType 图片的业务类型 如个人图片 personal
* @returns {boolean}
*/
uploadOneImage:function(FileDivId,showUrlId,saveUrlId,uploadType){
//设置domain
document.domain = "localhost";
$.ajaxFileUpload
(
{
url:'http://localhost:8088/upload/upload.json', //用于文件上传的服务器端请求地址
secureuri: false, //一般设置为false
fileElementId: FileDivId, //文件上传空间的id属性 <input type="file" id="file" name="file" />
data: {//加入的文本参数
"uploadType": uploadType
},
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
{
//服务器地址
var serverUrl = "http://www.testimage.com";
if(data=="error"){
alert("上传图片失败");
return false;
}
//回显图片完整地址
$("#"+showUrlId).attr("src",serverUrl+ data);
//赋值图片上传绝对路劲
$("#"+saveUrlId).val(data);
},
error: function (data, status, e)//服务器响应失败处理函数
{
console.log(data);
}
}
);
return false;
}
};
四.修改ajaxfileupload.js 方法uploadhttpData返回值
jQuery.extend({
handleError: function( s, xhr, status, e ) {
// If a local callback was specified, fire it
if ( s.error )
s.error( xhr, status, e );
// If we have some XML response text (e.g. from an AJAX call) then log it in the console
else if(xhr.responseText)
console.log(xhr.responseText);
},
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>');
if(data)
{
for(var i in data)
{
jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
}
}
var oldElement = jQuery('#' + fileElementId);
var newElement = jQuery(oldElement).clone();
jQuery(oldElement).attr('id', fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
/*var oldElement = jQuery('#' + fileElementId);
var newElement = oldElement.clone(true);
newElement[0].files=oldElement[0].files;
oldElement.attr('id', fileId);
oldElement.before(newElement);
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 = 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?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;
}
//去掉html标签，以便返回的json能转换成对象
if(xml.responseText){
xml.responseText = xml.responseText.replace(/<pre[^>]*>|<\/pre>/g,'');
}
}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 );
// evaluate scripts within html
if ( type == "html" )
jQuery("<div>").html(data).evalScripts();*/
//修改原生js代码返回需要的图片上传key 去掉<script>标签内容 解决跨域问题
var reg=/<script[^>]*>.*(?=<\/script>)<\/script>/gi;
data = data.replace(reg,'');
return data;
}
})