Springboot-17-springboot File Upload and download

Single File Upload

1, you need to use Thymeleaf Template: http://www.cnblogs.com/wenbronk/p/6565834.html

Src/main/resource/template/file.html

<! DOCTYPE html>"http://www.w3.org/1999/xhtml"Xmlns:th="http://www.thymeleaf.org"xmlns:sec="Http://www.thymeleaf.org/thymeleaf-extras-springsecurity3"> "POST"Enctype="Multipart/form-data"action="/upload"> <p> files: <input type="file"Name="file"/></p> <p><input type="Submit"Value="Upload"/></p> </form> </body>
File Upload Method
Package Com.iwhere.main.controller;import Java.io.bufferedinputstream;import java.io.BufferedOutputStream; Import Java.io.file;import java.io.fileinputstream;import Java.io.ioexception;import Java.util.List;import Java.util.uuid;import Javax.servlet.servletoutputstream;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import Org.springframework.web.bind.annotation.requestmapping;import Org.springframework.web.bind.annotation.requestmethod;import Org.springframework.web.bind.annotation.requestparam;import Org.springframework.web.bind.annotation.restcontroller;import Org.springframework.web.multipart.MultipartFile; Import Org.springframework.web.multipart.MultipartHttpServletRequest;/** * File Upload controller * * @RestController equivalent to simultaneous @Controller and @responsebody two annotations * * @author Wenbronk * @time April 6, 2017 pm 2:43:03*/@RestController Public classFileuploadcontroller {/** * File Upload * * @return*/@RequestMapping (Value="/upload", method =requestmethod.post) PublicString Handlfileupload (@RequestParam ("file") multipartfile file) {if(File.isempty ()) {return "the file is empty"; }        //reads the contents of the file and writes it to the specified directoryString FileName =File.getoriginalfilename (); //String suffixname = filename.substring (Filename.lastindexof ("."));FileName = Uuid.randomuuid () +"|+=|-|"+FileName; File dest=NewFile ("e:/test/"+fileName); //determine if a directory exists        if(!Dest.getparentfile (). exists ())        {Dest.getparentfile (). Mkdirs (); }        Try{File.transferto (dest); } Catch(IOException e) {return "backstage also don't know why, anyway is upload failed"; }        return "Upload Successful"; }}
Multiple file uploads:
1, Thymeleaf
Src/main/resource/template/multifile.html
<! DOCTYPE html>"http://www.w3.org/1999/xhtml"Xmlns:th="http://www.thymeleaf.org"xmlns:sec="Http://www.thymeleaf.org/thymeleaf-extras-springsecurity3"> "POST"Enctype="Multipart/form-data"action="/batch/upload"> <p> Files 1:<input type="file"Name="file"/></p> <p> file 2:<input type="file"Name="file"/></p> <p> file 3:<input type="file"Name="file"/></p> <p><input type="Submit"Value="Upload"/></p> </form> </body>
2, multi-File Upload method
    /** * Multi-File Upload * Similar to single file upload, traverse * @return*/@RequestMapping (Value="Multiupload", method =requestmethod.post) PublicString handlemultifileupload (httpservletrequest request) {List<MultipartFile> files = ((multiparthttpservletrequest) request). GetFiles ("file");  for(Multipartfile multipartfile:files) {if(Multipartfile.isempty ()) {return "the file is empty"; }            //reads the contents of the file and writes it to the specified directoryString FileName =Multipartfile.getoriginalfilename (); //String suffixname =//filename.substring (Filename.lastindexof ("."));FileName = Uuid.randomuuid () +"|+=|-|"+FileName; File dest=NewFile ("e:/test/"+fileName); //determine if a directory exists            if(!Dest.getparentfile (). exists ())            {Dest.getparentfile (). Mkdirs (); }            Try{Multipartfile.transferto (dest); } Catch(IOException e) {return "backstage also don't know why, anyway is upload failed"; }        }        return "Upload Successful"; }
File download
/** * File Download * * @return*/@RequestMapping ("/download")     PublicString DownLoadFile (httpservletrequest request, httpservletresponse response) {//The file name can be obtained from the request, here for convenience, written deadString FileName ="Rtsch_ex.json"; //String Path = Request.getservletcontext (). Getrealpath ("/");String Path ="e:/test"; File File=NewFile (path, fileName); if(File.exists ()) {//set force download to openResponse.setcontenttype ("Application/force-download"); //garbled file name, using new String () to reverse encodeResponse.AddHeader ("content-disposition","attachment;filename="+fileName); //Read FileBufferedinputstream bi =NULL; Try {                byte[] buffer =New byte[1024x768]; Bi=NewBufferedinputstream (NewFileInputStream (NewFile (""))); Servletoutputstream OutputStream=Response.getoutputstream (); inti =-1;  while(-1! = (i =bi.read (buffer))) {outputstream.write (buffer,0, i); }                return "Download Successful"; } Catch(Exception e) {return "Program Ape really don't know why, anyway, download failed."; } finally {                if(Bi! =NULL) {                    Try{bi.close (); } Catch(IOException e) {e.printstacktrace (); }                }            }        }        return "file does not exist"; }
File download, the most likely to appear garbled file name problem, here using new String () to deserialize,
String downname = new String (Filename.getbytes ("GBK"), "iso8859-1");
There is, of course, a less stable approach:
" UTF-8 "));  
There's another kind of, not very effective.
Springboot-17-springboot File Upload and download