SPRINGMVC frame--Common interface image upload interface

I want the image upload interface refers to the server side after the completion of the image upload, return an accessible image address .

The Spring MVC Framework film upload is very simple, as follows

1@RequestMapping (value= "/uploadimg", method=requestmethod.post)2 @ResponseBody3  PublicString uploadimg (@RequestParam (value= "img") multipartfile img) {4File f =NewFile ("/data/images");5     Try{6 Fileutils.copyinputstreamtofile (Img.getinputstream (), f);7}Catch(Exception e) {8 e.printstacktrace ();9     }Ten     return"Upload succeeded"; One}

It's very simple!

1 <formAction= "HTTP://LOCALHOST/COMPONENT/COMMON/UPLOADIMG"Method= "POST"enctype= "Multipart/form-data">2Avatar:<inputtype= "File"name= "img" /><BR/>3     <inputtype= "image"src= "./images/img_submit.gif" />4 </form>

The above is only able to upload files, and we will be able to return a picture address, the image address to be able to directly access in the browser, as follows:

Direct Code It!

Controller layer

1@RequestMapping (value= "/uploadimg", method=requestmethod.post)2 @ResponseBody3  PublicString uploadimg (@RequestParam (value= "img") multipartfile img, httpservletresponse response) {4Jsonobject result =NewJsonobject ();5     BooleanFlag =true;6     Try {7Flag =pictureuploadservice.upload (img, result);8}Catch(Exception e) {9Result.put ("mess", "Call failed");TenFlag =false; One e.printstacktrace (); A     } -Result.put ("Flag", flag); -      theResponse.setcontenttype ("Text/html;charset=utf-8"); -     //troubleshoot cross-domain access issues -Response.setheader ("Access-control-allow-origin", "*"); -      +     returnresult.tostring (); -}

View Code

Service Layer

1 /**2 * Upload Images3  * @paramfile4  * @paramparams5  * @return6  * @throwsException7  */8  Public BooleanUpload (multipartfile file, jsonobject params)throwsexception{9     //Filter the legal file typesTenString FileName =file.getoriginalfilename (); OneString suffix = filename.substring (Filename.lastindexof (".") +1); AString Allowsuffixs = "Gif,jpg,jpeg,bmp,png,ico"; -     if(allowsuffixs.indexof (suffix) = =-1){ -Params.put ("ResultStr", "not support the file type!"); the         return false; -     } -      -     //Get network address, local address header +Properties config =NewProperties (); -Config.load ( This. GetClass (). getClassLoader (). getResourceAsStream ("Config.properties")); +String URLPath = Config.getproperty ("UrlRoot"); AString LocalPath = Config.getproperty ("Localroot"); at      -     //Create a new directory -String uri = File.separator +dateutil.getnowdatestr (file.separator); -File dir =NewFile (LocalPath +URI); -     if(!dir.exists ()) { - dir.mkdirs (); in     } -      to     //Create a new file +String NewFileName =stringutil.getuniquefilename (); -File f =NewFile (Dir.getpath () + file.separator + NewFileName + "." +suffix); the      *     //copy data from the input stream to a new file $ Fileutils.copyinputstreamtofile (File.getinputstream (), f);Panax Notoginseng      -     //Create a Picture object thePicture pic =NewPicture (); + Pic.setlocalpath (F.getabsolutepath ()); A Pic.setname (F.getname ()); thePic.seturl (URLPath + uri.replace ("\ \", "/") + "/" + NewFileName + "." +suffix); +Pic.setaddtime (NewDate ()); -      $     //inserting into a database $     //... -      -Params.put ("ResultStr", Pic.geturl ()); the      -     return true;Wuyi}

View Code

(There is no DAO layer, I configure the domain name of the network address in the properties and the local file storage directory)

There are several places to note to upload files:

• Upload files in Chinese garbled (this is not considered, after all, to achieve is the image upload)
• Limit the size of the upload file (the file is too large to cause the server to be overwhelmed), which we limit in spring MVC configuration file

  1 <Beans:beanID= "Multipartresolver"class= "Org.springframework.web.multipart.commons.CommonsMultipartResolver">2     <Beans:propertyname= "Defaultencoding"value= "Utf-8" />3     <Beans:propertyname= "Maxuploadsize"value= "10485760000" />4     <Beans:propertyname= "Maxinmemorysize"value= "40960" />5 </Beans:bean>

• Limit upload file types (this we process at the service layer)
• If more than 1000 files are saved under a folder, the file access performance will be affected, so the uploaded files should be distributed in a variety of ways, without having to stick to one. I'm slacking off here.Month DayAsDirectory Hierarchy）

  1 /**2 * Get the current date string3  * @paramSeparator4  * @return5  */6  Public Staticstring Getnowdatestr (String separator) {7Calendar now =calendar.getinstance ();8     intYear =Now.get (calendar.year);9     intmonth = Now.get (calendar.month) +1;Ten     intDay =Now.get (calendar.date); One      A     returnYear + separator + month + separator +Day ; -}

• Files saved after successful upload cannot have duplicate names (that is, the file name is unique)

  1 // generate a unique file name 2  Public Static String GetUniqueFileName () {3     String str = uuid.randomuuid (). toString (); 4     return str.replace ("-", "" "); 5 }

The upload image process is as follows:

After clicking Upload, return

Enter the above image address in the browser to access it and then appear

SPRINGMVC frame--Common interface image upload interface