springmvc--File Upload Download

I. File download

//File Download@RequestMapping ("/testresponseentity")     Publicresponseentity<byte[]> Testresponseentity (HttpSession session)throwsioexception{byte[] BODY =NULL; InputStream in= Session.getservletcontext (). getResourceAsStream ("/file/abc.txt"); System.out.println ("InputStream" +In ); Body=New byte[In.available ()];                In.read (body); Httpheaders Headers=Newhttpheaders (); Headers.add ("Content-disposition", "Attachment;filename=abc.txt"); Responseentity<byte[]> response =Newresponseentity<byte[]>(body, headers, httpstatus.ok); returnresponse; }

Two. File Upload

SPRINGMVC provides direct support for file uploads, which is implemented through plug-and-play multipartresolver.

Spring implements the Multipartresolver implementation class with Jakarta Commons FileUpload technology: Commonsmultipartresolver

See below how to implement

1. Introduce the following JAR package

Commons-fileupload.jar

Commons-io.jar (Dependency package for the jar above <-)

In the 2.SPRINGMVC configuration file, configure the following

<id= "Multipartresolver"  class= " Org.springframework.web.multipart.commons.CommonsMultipartResolver ">        <   name= "defaultencoding"  value= "UTF-8"></  Property>        </beans>

3. The foreground code is as follows:

<formAction= "Testfileupload"enctype= "Multipart/form-data"Method= "POST">File:<inputtype= "File"name= "File"><BR>Desc:<inputtype= "text"name= "desc"><BR>    <inputtype= "Submit"value= "Submit">    </form>

4. The background code is as follows:

    // File Upload    @RequestMapping (value= "/testfileupload")    public String testfileupload (@RequestParam ("desc" ) String desc,            @RequestParam (throws  ioexception{        System.out.println ("desc:" + desc);        System.out.println ("file name:" + file.getoriginalfilename ());        System.out.println ("file InputStream" + File.getinputstream ());         return "Success";    }

springmvc--File Upload Download