异步上传图片-不压缩图片

 <bean id="multipartResolver"        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">        <!-- 设置上传文件的最大尺寸为1MB -->        <property name="maxUploadSize">            <value>10485760</value>        </property>    </bean>

spring.xml

<form action="#" name="myform" method="post">  <input type='file'  id="uploada" name="uploada" size='50'/>  <input type="button" style="width: 5em"  onclick="uploadImages('uploada')" value='上传'/>  <input type='file'  id="uploadb" name="uploadb" size='50'/>  <input type="button" style="width: 5em"  onclick="uploadImages('uploadb')" value='上传'/>  <input type='file'  id="uploadc" name="uploadc" size='50'/>  <input type="button" style="width: 5em"  onclick="uploadImages('uploadc')" value='上传'/>  </form>  

html

function uploadImages(type) {$.ajaxFileUpload({//跟具updateP得到不同的上传文本的ID               url:'${ctx}/pages/Demo/uploadImg.htm?updateP='+type,             //需要链接到服务器地址               secureuri:false,               fileElementId:''+type+'',                         //文件选择框的id属性（必须）               dataType: 'text',                 success: function (data, status){                 var data = eval("("+data+")");if(data.updateP=='uploada'){alert("${ctx}/upload/"+data.fileName);}else if(data.updateP=='uploadb'){alert("${ctx}/upload/"+data.fileName);}else if(data.updateP=='uploadc'){alert("${ctx}/upload/"+data.fileName);}               },               error: function (data, status, e){                     alert('上传失败');               }             }          );}

JS

public ModelAndView uploadImg(HttpServletRequest request, HttpServletResponse response) throws IOException{request.setCharacterEncoding("UTF-8");response.setContentType("text/html;charset=UTF-8");PrintWriter out = response.getWriter();SimpleDateFormat simpleFormat = new SimpleDateFormat("MMddHHmmsss");String generationfileName = simpleFormat.format(new Date())+new Random().nextInt(1000);//保存路径String savePath = "D:/upload";String updateP = request.getParameter("updateP");String fileNameSuffix=null;String fileName= null;if(null!=updateP&&!"".equals(updateP)){try {MultipartFile mf = ((MultipartRequest) request).getFile(updateP);fileName=mf.getOriginalFilename();if(null!=mf&&!"".equals(mf)){fileNameSuffix=fileName.substring(fileName.lastIndexOf(".")+1,fileName.length());SaveFileFromInputStream(mf.getInputStream(),savePath,generationfileName+"."+fileNameSuffix);out.write("{'state':'0','fileName':'"+generationfileName+"."+fileNameSuffix+"','updateP':'"+updateP+"'}");}} catch (Exception e) {out.write("{'state':'1'}");e.printStackTrace();}}return null;}//保存文件   1,文件   2，保存路径 3，文件名称public void SaveFileFromInputStream(InputStream stream,String path,String filename) throws IOException{              FileOutputStream fs=new FileOutputStream( path + "/"+ filename);        byte[] buffer =new byte[1024*1024];        int bytesum = 0;        int byteread = 0;         while ((byteread=stream.read(buffer))!=-1){           bytesum+=byteread;           fs.write(buffer,0,byteread);           fs.flush();        }         fs.close();        stream.close();      }

JAVA

// JavaScript DocumentjQuery.extend({    createUploadIframe: function(id, uri) {   //create frame            var frameId = 'jUploadFrame' + id;            if(window.ActiveXObject) {            if($.browser.version=="9.0" || $.browser.version=="10.0"){                      var io = document.createElement('iframe');                      io.id = frameId;                      io.name = frameId;                  }else if($.browser.version=="6.0" || $.browser.version=="7.0" || $.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;    }});

ajaxfileupload.js