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First, Introduction
You need to add the enctype= "Multipart/form-data" property to the form using the form form, in addition to changing the form's submission method to post, method= "POST" as follows.
Ii. examples
1, form file upload
The page code is as follows:
1 <!DOCTYPE HTML>2 <HTML>3 <Head>4 </Head>5 <Body> 6 <formAction= "${pagecontext.request.contextpath}/file/upload.action"Method= "POST"enctype= "Multipart/form-data">7 <DivID= "Contenttable"style= "border:0px;">8 <H1class= "title"style= "font-size:15px; border-bottom:1px solid #DFE3E6;">Import data</H1>9 <Tablewidth= "80%">Ten <TR> One <TDwidth= "20%"Align= "Right"> A Select a file to upload - </TD> - <TDwidth= "70%"ID= "Name_h"title=""style= "Text-align:center;"> the <inputtype= "File"name= "Xlsfile"ID= "Xlsfile" /> - </TD> - </TR> - </Table> + <DivID= "Activitytable"> - <inputID= "Btnsave"type= "Submit"value= "Guide in" /> + </Div> A </Div> at </form> - </Body> - </HTML>
Back-end upload processing code:
1 /**2 * Use SPRINGMVC to process file uploads3 */4@RequestMapping ("Upload")5 @ResponseBody6 Public BooleanUpload (httpservletrequest request, HttpServletResponse response, HttpSession session)throwsunsupportedencodingexception {7String path = Request.getsession (). Getservletcontext (). Getrealpath ("");8Calendar Calendar =calendar.getinstance ();9Calendar.settime (NewDate ());TenRequest.setcharacterencoding ("UTF-8"); OnePath = String.Format ("%s%s%s\\%s\\%s\\%s", Path, "Upload", "file", Calendar.get (calendar. Year), A Calendar.get (Calendar. MONTH), Calendar.get (calendar. Day_of_month)); -File filepath =NewFile (path); - if(!filepath.exists ()) { the filepath.mkdirs (); - } -Multiparthttpservletrequest multipartrequest =(multiparthttpservletrequest) request; - Get Files +Multipartfile multipartfile = Multipartrequest.getfile ("Xlsfile"); -OutputStream OS =NULL; +InputStream is =NULL; AFile UploadFile =NULL; at Try { -is =Multipartfile.getinputstream (); -UploadFile =NewFile (filepath, System.currenttimemillis () + ". xls"); -OS =NewFileOutputStream (uploadfile); -Ioutils.copy (is, OS);//using the Commons-io component for file stream processing - Os.flush (); in}Catch(IOException e) { - e.printstacktrace (); to return false; +}finally{ - ioutils.closequietly (OS); the ioutils.closequietly (IS); * } $ return true;Panax Notoginseng}
2. File download
1 /**2 * Use SPRINGMVC for file download processing3 */4@RequestMapping ({"/template" })5 Public voiddownloadtemplate (httpservletrequest request, httpservletresponse response)6 throwsunsupportedencodingexception {7String path = Request.getsession (). Getservletcontext (). Getrealpath ("");8String filename = "template file. xls";9File File =NewFile (path + "\\file\\templagte\\" +filename);TenString useragent = Request.getheader ("User-agent"); One byte[] bytes = Useragent.contains ("MSIE")? Filename.getbytes (): Filename.getbytes ("UTF-8");//filename.getbytes ("UTF-8") handles Safari's garbled problems AString FileName =NewString (Bytes, "Iso-8859-1"); - //Format the output -Response.setcontenttype ("Multipart/form-data"); theResponse.setheader ("Content-disposition", "attachment;filename=" +fileName); - -InputStream instream =NULL; - Try { +Instream =Newfileinputstream (file); -Ioutils.copy (Instream, Response.getoutputstream ());//using the Commons-io component for file stream processing +}Catch(IOException e) { A e.printstacktrace (); at}finally{ - ioutils.closequietly (instream); -}
Form file upload and file download
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