SPRINGMVC (6) File upload

Last Update:2015-04-15 Source: Internet

Author: User

Tags save file uuid

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SPRINGMVC (6) File upload

We do an example of uploading images, the page (fileupload.jsp) function is as follows: Upload successfully immediately after uploading the image. UPLOAD.JSP:

In the form form, enctype= "Mulitpart/form-data" is required, and method must be post, don't forget it. Specially searched this thing, below is the explanation on the W3cschool website: HTML enctype attribute 1) His role is to set the MIME encoding of the form, by default, this encoding format is application/x-www-form-urlencoded, cannot be used for file upload; only multipart/form-data can be used to transfer the file data completely. 2) enctype= "Multipart/form-data" is to upload binary data; The value of input in the form is passed in 2 binary ways. It is not possible to use Request.getparameter () to get the values of individual form elements when a form request is passed to another JSP or servlet. When uploading using Multipart/form-data, the request sent is different from the normal HTTP, which requires conversion before other parameters can be read. In addition, we need to import two dependent commons packages: Org.apache.commons.fileupload-1.2.0.jarorg.apache.commons.io-1.4.0.jar one, the traditional way of file flowto create a new Fileuploadcontroller, there are two methods:tofile ()---Jump to the uploaded JSP pagefileUpload ()---File Upload out of processing class

@Controller@RequestMapping ("/file")Public class Fileuploadcontroller { @RequestMapping ("/tofile")//Jump to File upload jsp pagePublic String Tofileupload () {return "FileUpload"; } @RequestMapping ("/fileupload")Public String FileUpload (@RequestParam ("file") commonsmultipartfile file,httpservletrequest request, Modelmap model) { //Get original file nameString fileName = File.getoriginalfilename ();System.out.println ("filename:" + filename); //New file nameString newfilename = Uuid.randomuuid () +filename; //upload to whereString Path = "d:/upload/";file F = new file (path);if (!f.exists ()) f.mkdirs ();if (!file.isempty ()) {try {FileOutputStream fos = new FileOutputStream (path+newfilename);InputStream in = File.getinputstream ();int b = 0;While ((B=in.read ())!=-1) {Fos.write (b); }fos.close ();in.close ();} catch (Exception e) {e.printstacktrace (); } }System.out.println ("Imgurl:" + path+newfilename);//Save file Address for JSP page EchoModel.addattribute ("FileUrl", path+newfilename); return "FileUpload"; }
}

Second, the SPRINGMVC provides Multirequestresolver upload methodSpring expands on the HttpServletRequest interface of the Servlet API to allow it to handle file uploads well. The extended interface name is:Org.springframework.web.multipart.MultipartHttpServletRequest
Multiparthttpservletrequest mrequest = (multiparthttpservletrequest) (request);
the parameters can then be read normally: Mrequest.getparameter ("xxx"); We're going to add a fileUpload2 method to the Fileuploadcontroller :

@RequestMapping ("/fileupload2")Public String fileUpload2 (httpservletrequest request,httpservletresponse response) throws exception{commonsmultipartresolver CMR = new Commonsmultipartresolver (Request.getservletcontext ());if (Cmr.ismultipart (Request)) {multiparthttpservletrequest mrequest = (multiparthttpservletrequest) (request);iterator<string> files = mrequest.getfilenames ();While (Files.hasnext ()) {multipartfile mfile = Mrequest.getfile (Files.next ());if (mfile! = null) {String fileName = Uuid.randomuuid () +mfile.getoriginalfilename ();String Path = "d:/upload/" +filename; file LocalFile = new file (path);Mfile.transferto (localfile);Request.setattribute ("FileUrl", path); } } }return "FileUpload";}

So we're done uploading the file.

SPRINGMVC (6) File upload

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