Converting File to MultiPartFile

Question

Is there any way to convert a File object to MultiPartFile  So that I can send that object to methods that accept the objects of MultiPartFile interface   File myFile   new File   path to the file txt    MultiPartFile        def  MultiPartFile file      def is   new BufferedInputStream file getInputStream        do something interesting with the stream

User · Answer

import java io File  import java io FileInputStream  import java io IOException   import org apache commons io IOUtils  import org springframework mock web MockMultipartFile  import org springframework web multipart MultipartFile   public static void main String   args            convertFiletoMultiPart               private static void convertFiletoMultiPart             try               File file   new File FILE PATH               if  file exists                      System out println  File Exist   gt      file getName              file getAbsolutePath                               FileInputStream input   new FileInputStream file               MultipartFile multipartFile   new MockMultipartFile  file   file getName     text plain                       IOUtils toByteArray input                System out println  multipartFile   gt      multipartFile isEmpty                                  multipartFile getOriginalFilename              multipartFile getName                                  multipartFile getSize              multipartFile getBytes               catch  IOException e                System out println  Exception   gt      e getLocalizedMessage                       This worked for me

User · Answer

If you can t import MockMultipartFile using import org springframework mock web MockMultipartFile   you need to add the below dependency into pom xml   lt dependency gt       lt groupId gt org springframework boot lt  groupId gt       lt artifactId gt spring-boot-starter-test lt  artifactId gt       lt scope gt test lt  scope gt   lt  dependency gt

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MultipartFile multipartFile   new MockMultipartFile  test xlsx   new FileInputStream new File   home admin test xlsx        This code works fine for me  May be you can have a try

User · Answer

Solution without Mocking class  Java9  and Spring only   FileItem fileItem   new DiskFileItemFactory   createItem  file       Files probeContentType file toPath     false  file getName      try  InputStream in   new FileInputStream file   OutputStream out   fileItem getOutputStream          in transferTo out     catch  Exception e        throw new IllegalArgumentException  Invalid file      e  e      CommonsMultipartFile multipartFile   new CommonsMultipartFile fileItem

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MockMultipartFile exists for this purpose  As in your snippet if the file path is known  the below code works for me   import java nio file Files  import java nio file Path  import java nio file Paths  import org springframework mock web MockMultipartFile   Path path   Paths get   path to the file txt    String name    file txt   String originalFileName    file txt   String contentType    text plain   byte   content   null  try       content   Files readAllBytes path     catch  final IOException e      MultipartFile result   new MockMultipartFile name                       originalFileName  contentType  content

User · Answer

In my case  the  fileItem getOutputStream      wasn t working  Thus I made it myself using IOUtils   File file   new File   path to file    FileItem fileItem   new DiskFileItem  mainFile   Files probeContentType file toPath     false  file getName     int  file length    file getParentFile      try       InputStream input   new FileInputStream file       OutputStream os   fileItem getOutputStream        IOUtils copy input  os          Or faster          IOUtils copy new FileInputStream file   fileItem getOutputStream       catch  IOException ex           do something     MultipartFile multipartFile   new CommonsMultipartFile fileItem

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File file   new File  src test resources validation txt    DiskFileItem fileItem   new DiskFileItem  file    text plain   false  file getName     int  file length     file getParentFile     fileItem getOutputStream    MultipartFile multipartFile   new CommonsMultipartFile fileItem     You need the    fileItem getOutputStream      because it will throw NPE otherwise

User · Answer

File file   new File  src test resources input txt    FileInputStream input   new FileInputStream file   MultipartFile multipartFile   new MockMultipartFile  file               file getName     text plain   IOUtils toByteArray input

User · Answer

It s working for me   File file   path toFile    String mimeType   Files probeContentType path         DiskFileItem fileItem   new DiskFileItem  file   mimeType  false  file getName     int  file length                file getParentFile     fileItem getOutputStream    MultipartFile multipartFile   new CommonsMultipartFile fileItem

User · Answer

This is a solution without creating manually a file on disc    MultipartFile fichier   new MockMultipartFile  fileThatDoesNotExists txt                fileThatDoesNotExists txt                text plain                This is a dummy file content  getBytes StandardCharsets UTF 8

[java] Converting File to MultiPartFile

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