前端部分
使用ajaxFileUpload 主要是为了异步上传文件，不需要开启新的页面进行上传！
由于segmentfault不能上传文件，该文件ajaxFileUpload.js的代码在本篇文章的最底部：
由于ajaxFileUpload这个文件已经很久没用更新了，所以增加了handleError: function( s, xhr, status, e )来处理错误，
前端代码如下：
第一个input中的accept属性是为了限制上传的文件属性，其他文件可以去掉该属性
引用两个js文件
<script src="jquery-1.7.1.js" type="text/javascript"></script>
<script src="ajaxfileupload.js" type="text/javascript"></script>上传按钮：
<input type="file" id="upload" name="imagefile" accept="image/png,image/gif" />
<input type="button" value="上传" onclick="return ajaxFileUpload();"/>js代码：
//图片上传
function ajaxFileUpload()
{
$.ajaxFileUpload({
url:'/ai/app/uploadImage',//用于文件上传的服务器端请求地址
secureuri:false ,//一般设置为false
fileElementId:'upload',//文件上传控件的id属性 <input type="file" id="upload" name="upload" />
dataType: 'text',//返回值类型 一般设置为json
success: function (message) //服务器成功响应处理函数
{
layer.alert(message);
$("#tool_icon").val(message);
},
error: function (data, status, e)//服务器响应失败处理函数
{
alert(e);
}
});
return false;
}后端部分
该项目使用的spring框架，需要配置bean，来接受上传的文件
<!-- 上传文件拦截，设置最大上传文件大小 10M=10*1024*1024(B)=10485760 bytes -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="10485760" />
</bean>后端代码
@ResponseBody
@RequestMapping(value="/uploadImage",method=RequestMethod.POST)
public String uploadImage(HttpServletRequest request,@RequestParam("imagefile") MultipartFile file) throws IOException{
String getOriginalFilename = null;
logger.debug("文件原名: " + getOriginalFilename);
logger.debug("文件名称: " + file.getName());
logger.debug("文件长度: " + file.getSize());
logger.debug("文件类型: " + file.getContentType());
if( file.isEmpty()){
logger.error("upload image--------------------------------->failed");
return "please select a image";
}
/**文件在服务器中的实际路径*/
String realPath = request.getSession().getServletContext().getRealPath("/upload");
logger.debug("realPath---------------------------------------->"+realPath);
logger.debug("getOriginalFilename----------------------------->"+file.getOriginalFilename());
/**写入地址中*/
FileUtils.copyInputStreamToFile(file.getInputStream(), new File(realPath,file.getOriginalFilename()));
/**使用原生方法*/
/* byte[] bytes = file.getBytes();
BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(new File("/ai/images/icons/toolLogo/demo.png")));
stream.write(bytes);
stream.close();*/
/**返回文件在服务器中的地址，用于存储入库*/
String resultUrl = "/ai/upload/"+file.getOriginalFilename();
logger.debug("upload image file result----------------------->"+resultUrl);
return resultUrl;
}相关jar包下载：org.apache.commons.io_1.3.2.jar org.apache.commons.fileupload.jar
相关jar包的地址
参考blog：
jQuery插件之ajaxFileUpload
http://blessht.iteye.com/blog/1405057
http://blog.csdn.net/jadyer/article/details/11693705
http://www.cnblogs.com/rollenholt/p/3693087.html
ajaxFileUpload.js 源代码
// JavaScript Document
jQuery.extend({
createUploadIframe: function(id, uri)
{
//create frame
var frameId = 'jUploadFrame' + id;
if(window.ActiveXObject) {
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;
},
handleError: function( s, xhr, status, e ) {
// If a local callback was specified, fire it
if ( s.error ) {
s.error.call( s.context || s, xhr, status, e );
}
// Fire the global callback
if ( s.global ) {
(s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );
}
}
});