How to convert a multipart file to File

Question

Can any one tell me what is a the best way to convert a multipart file   org springframework web multipart MultipartFile  to File  java io File     In my spring mvc web project i m getting uploaded file as Multipart file I have to convert it to a File io   there fore I can call this image storing service Cloudinary  They only take type  File    I have done so many searches but failed If anybody knows a good standard way please let me know  Thnx

User · Answer

private File convertMultiPartToFile MultipartFile file   throws IOException               File convFile   new File  file getOriginalFilename              FileOutputStream fos   new FileOutputStream  convFile            fos write  file getBytes              fos close            return convFile

User · Answer

The answer by Alex78191 has worked for me   public File getTempFile MultipartFile multipartFile     CommonsMultipartFile commonsMultipartFile    CommonsMultipartFile  multipartFile  FileItem fileItem   commonsMultipartFile getFileItem    DiskFileItem diskFileItem    DiskFileItem  fileItem  String absPath   diskFileItem getStoreLocation   getAbsolutePath    File file   new File absPath      trick to implicitly save on disk small files   lt 10240 bytes by default   if   file exists          file createNewFile        multipartFile transferTo file      return file      For uploading files having size greater than 10240 bytes please change the maxInMemorySize in multipartResolver to 1MB    lt bean id  multipartResolver      class  org springframework web multipart commons CommonsMultipartResolver  gt   lt  -- setting maximum upload size t 20MB -- gt   lt property name  maxUploadSize  value  20971520    gt   lt  -- max size of file in memory  in bytes  -- gt   lt property name  maxInMemorySize  value  1048576    gt   lt  -- 1MB -- gt   lt  bean gt

User · Answer

You can access tempfile in Spring by casting if the class of interface MultipartFile is CommonsMultipartFile   public File getTempFile MultipartFile multipartFile        CommonsMultipartFile commonsMultipartFile    CommonsMultipartFile  multipartFile      FileItem fileItem   commonsMultipartFile getFileItem        DiskFileItem diskFileItem    DiskFileItem  fileItem      String absPath   diskFileItem getStoreLocation   getAbsolutePath        File file   new File absPath          trick to implicitly save on disk small files   lt 10240 bytes by default      if   file exists              file createNewFile            multipartFile transferTo file              return file      To get rid of the trick with files less than 10240 bytes maxInMemorySize property can be set to 0 in  Configuration  EnableWebMvc class  After that  all uploaded files will be stored on disk    Bean name    multipartResolver       public CommonsMultipartResolver createMultipartResolver             CommonsMultipartResolver resolver   new CommonsMultipartResolver            resolver setDefaultEncoding  utf-8            resolver setMaxInMemorySize 0           return resolver

User · Answer

if you don t want to use MultipartFile transferTo    You can write file like this      val dir   File filePackagePath      if   dir exists    dir mkdirs        val file   File   filePackagePath  multipartFile originalFilename    apply           createNewFile              FileOutputStream file  use           it write multipartFile bytes

User · Answer

MultipartFile transferTo File  is nice  but don t forget to clean the temp file after all      ask JVM to ask operating system to create temp file File tempFile   File createTempFile TEMP FILE PREFIX  TEMP FILE POSTFIX       ask JVM to delete it upon JVM exit if you forgot   can t delete due exception tempFile deleteOnExit        transfer MultipartFile to File multipartFile transferTo tempFile       do business logic here result   businessLogic tempFile       tidy up tempFile delete      Check out Razzlero s comment about File deleteOnExit   executed upon JVM exit  which may be extremely rare  details below

User · Answer

small correction on  PetrosTsialiamanis post   new File  multipart getOriginalFilename    this will create file in server location where sometime you will face write permission issues for the user  its not always possible to give write permission to every user who perform action  System getProperty  java io tmpdir   will create temp directory where your file will be created properly  This way you are creating temp folder  where file gets created   later on you can delete file or temp folder   public  static File multipartToFile MultipartFile multipart  String fileName  throws IllegalStateException  IOException       File convFile   new File System getProperty  java io tmpdir       fileName       multipart transferTo convFile       return convFile      put this method in ur common utility and use it like for eg  Utility multipartToFile

User · Answer

You can also use the Apache Commons IO library and the FileUtils class  In case you are using maven you can load it using the above dependency    lt dependency gt       lt groupId gt commons-io lt  groupId gt       lt artifactId gt commons-io lt  artifactId gt       lt version gt 2 4 lt  version gt   lt  dependency gt    The source for the MultipartFile save to disk   File file   new File directory  filename       Create the file using the touch method of the FileUtils class     FileUtils touch file       Write bytes from the multipart file to disk  FileUtils writeByteArrayToFile file  multipartFile getBytes

User · Answer

You can get the content of a MultipartFile by using the getBytes method and you can write to the file using Files newOutputStream     public void write MultipartFile file  Path dir        Path filepath   Paths get dir toString    file getOriginalFilename          try  OutputStream os   Files newOutputStream filepath             os write file getBytes               You can also use the transferTo method   public void multipartFileToFile      MultipartFile multipart       Path dir   throws IOException       Path filepath   Paths get dir toString    multipart getOriginalFilename         multipart transferTo filepath

User · Answer

Although the accepted answer is correct but if you are just trying to upload your image to cloudinary  there s a better way   Map upload   cloudinary uploader   upload multipartFile getBytes    ObjectUtils emptyMap       Where multipartFile is your org springframework web multipart MultipartFile

[java] How to convert a multipart file to File?

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