Image upload (ii)

This method requires the form form to be submitted and then jump to the page (no first method is good):

First, the JSP code:

<Divclass= "Tphoto"name= "Head_img"ID= "Head_img">    <inputtype= "File"name= "File"onchange= "Previewimage (this)" />    <DivID= "Preview">        <imgID= "Imghead"Border=0src= ' ${ctx}/static/images/elearning/photo_teacher.png '>    </Div></Div>

Second, JS code:

//image Upload    functionpreviewimage (file) {varMAXWIDTH = 100; varMaxHeight = 100; vardiv = document.getElementById (' preview '); if(File.files && File.files[0]) {div.innerhtml= '  '; varimg = document.getElementById (' Imghead '); Img.onload=function(){                    varRect =Clacimgzoomparam (MAXWIDTH, MaxHeight, Img.offsetwidth, img.offsetheight); Img.width=Rect.width; Img.height=Rect.height; Img.style.marginLeft= rect.left+ ' px '; Img.style.marginTop= rect.top+ ' px '; }              varReader =NewFileReader (); Reader.onload=function(EVT) {IMG.SRC =Evt.target.result;} Reader.readasdataurl (file.files[0]); } Else {            varSfilter= ' Filter:progid:DXImageTransform.Microsoft.AlphaImageLoader (sizingmethod=scale,src= "';            File.select (); varsrc =Document.selection.createRange (). text; Div.innerhtml= '  '; varimg = document.getElementById (' Imghead '); Img.filters.item (' DXImageTransform.Microsoft.AlphaImageLoader '). src =src; varRect =Clacimgzoomparam (MAXWIDTH, MaxHeight, Img.offsetwidth, img.offsetheight); Status= (' rect: ' +rect.top+ ', ' +rect.left+ ', ' +rect.width+ ', ' +rect.height); Div.innerhtml= "<div id=divhead style= ' width:" +rect.width+ "Px;height:" +rect.height+ "Px;margin-top:" +rect.top+ "PX; Margin-left: "+rect.left+" PX; " +sfilter+src+ "\" ></div> "; }    }        functionClacimgzoomparam (MaxWidth, maxheight, width, height) {varparam = {top:0, left:0, Width:width, height:height}; if(Width>maxwidth | | height>maxheight) {Ratewidth= width/MaxWidth; Rateheight= height/MaxHeight; if(Ratewidth >rateheight) {Param.width=MaxWidth; Param.height= Math.Round (Height/ratewidth); } Else{param.width= Math.Round (Width/rateheight); Param.height=MaxHeight; }} param.left= Math.Round ((maxwidth-param.width)/2); Param.top= Math.Round ((maxheight-param.height)/2); returnparam; }

Third, the background Java code:

/*** * @Title: Insert * @Description: NEW *@param @paramparams *@param @paramRequest *@param @return     * @returnMessageresp *@throws     */@RequestMapping ("/insert")     Public ModelandviewInsertmodel Model,Trainerqueryparam params, httpservletrequest request, Multipartfile file{ Modelandview view = new Modelandview (); User u=Sessionutils.getuser (Request.getsession ()); /*** The attributes to be updated in the parameter object passed by the front end are transferred to the corresponding field properties of the model entity class, which can be implemented by a generic conversion **/Trainer Trainer=NewTrainer (); Try{beanutils.copyproperties (trainer, params);//The front is the target, followed by the source object}Catch(illegalaccessexception e) {Throw NewAjaxbusinessexception ("New Error! "); } Catch(InvocationTargetException e) {Throw NewAjaxbusinessexception ("New Error! "); } trainer.setid (Uuidutil.getuuid ()); //IDtrainer.setcorpid (Sessionutils.getcorpid (Request.getsession ())); Try {                       if (!file.isempty ()) {//Get project under Upload resource bundle path, of course this package is already present in the String path = Request.gets                                Ession (). Getservletcontext (). Getrealpath ("Upload/trainer_picture");                The name of the uploaded picture is String fileName = File.getoriginalfilename (); String NewFileName = uuidutil.generateguid () + filename.substring (Filename.lastindexof (".")).                                toLowerCase ();                The following is the conversion of the upload path letter StringBuffer importpath = new StringBuffer ();                                String temp[] = Path.split ("\\\\");                    for (int i = 0; i < temp.length; i++) {importpath.append (temp[i]);                Importpath.append ("/");                } importpath.append (NewFileName);                To see if there is a upload package, no new upload package will be created as the path to the resource upload file TargetFile = new file (path, newfilename);          if (!targetfile.exists ()) {          Targetfile.mkdirs ();                                }//File Upload File.transferto (targetfile);            Trainer.setheadimg (NewFileName); }                        if(Trainerservice.insert (trainer) = = 1) {Resp.setresult ("True"); Resp.setresultdesc ("New success!" "); }        } Catch(Exception e) {Resp.setresult ("False"); Resp.setresultdesc ("New Error!" "); }//Model.addattribute ("Trainerresp", TRAINERRESP);
Model.addattribute ("Srlist", srlist);

View.setviewname ("Views/xxx/manage/xxxinfo");

return view;     }

Image upload (ii)