Sending Multipart File as POST parameters with RestTemplate requests

Question

I am working with Spring 3 and RestTemplate  I have basically  two applications and one of them have to post values to the other app  through rest template    When the values to post are Strings  it s work perfect  but when i have to post mixed and complex params  like MultipartFiles  i get an converter exception   As example  i have this   App1 - PostController    RequestMapping method   RequestMethod POST  public String processSubmit  ModelAttribute UploadDTO pUploadDTO           BindingResult pResult  throws URISyntaxException  IOException       URI uri   new URI  http   localhost 8080 app2 file receiver         MultiValueMap lt String  Object gt  mvm   new LinkedMultiValueMap lt String  Object gt         mvm add  param1    TestParameter        mvm add  file   pUploadDTO getFile        MultipartFile      Map result   restTemplate postForObject uri  mvm  Map class       return  redirect postupload       On the other side    i have another web application  App2  that receives the parameters from the App1   App2 - ReceiverController   RequestMapping value     receiver   method     RequestMethod POST    public String processUploadFile           RequestParam value    param1   String param1           RequestParam value    file   MultipartFile file         if  file    null            System out println  Shit     is null          else           System out println  Yes     work done               return  redirect postupload       My application-context xml    lt bean id  restTemplate  class  org springframework web client RestTemplate  gt       lt property name  messageConverters  gt           lt list gt               lt bean class  org springframework http converter ByteArrayHttpMessageConverter    gt               lt bean class  org springframework http converter FormHttpMessageConverter    gt               lt bean class  org springframework http converter StringHttpMessageConverter    gt               lt bean class  org springframework http converter xml SourceHttpMessageConverter    gt           lt  list gt       lt  property gt   lt  bean gt    lt bean id  multipartResolver        class  org springframework web multipart commons CommonsMultipartResolver  gt         lt property name  maxUploadSize  gt             lt value gt 104857600 lt  value gt         lt  property gt         lt property name  maxInMemorySize  gt             lt value gt 4096 lt  value gt         lt  property gt         lt  bean gt      Here is the stack of the exception that i am getting when i do the postForObject of the RestTemplate     org springframework http converter HttpMessageNotWritableException  Could not write request  no suitable HttpMessageConverter found for request type  org springframework web multipart commons CommonsMultipartFile  at org springframework http converter FormHttpMessageConverter writePart FormHttpMessageConverter java 292  at org springframework http converter FormHttpMessageConverter writeParts FormHttpMessageConverter java 252  at org springframework http converter FormHttpMessageConverter writeMultipart FormHttpMessageConverter java 242  at org springframework http converter FormHttpMessageConverter write FormHttpMessageConverter java 194  at org springframework http converter FormHttpMessageConverter write FormHttpMessageConverter java 1  at org springframework web client RestTemplate HttpEntityRequestCallback doWithRequest RestTemplate java 588  at org springframework web client RestTemplate doExecute RestTemplate java 436  at org springframework web client RestTemplate execute RestTemplate java 415  at org springframework web client RestTemplate postForObject RestTemplate java 294  at com yoostar admintool web UploadTestController create UploadTestController java 86  at sun reflect NativeMethodAccessorImpl invoke0 Native Method  at sun reflect NativeMethodAccessorImpl invoke NativeMethodAccessorImpl java 39  at sun reflect DelegatingMethodAccessorImpl invoke DelegatingMethodAccessorImpl java 25  at java lang reflect Method invoke Method java 597  at org springframework web bind annotation support HandlerMethodInvoker invokeHandlerMethod HandlerMethodInvoker java 175  at org springframework web servlet mvc annotation AnnotationMethodHandlerAdapter invokeHandlerMethod AnnotationMethodHandlerAdapter java 421  at org springframework web servlet mvc annotation AnnotationMethodHandlerAdapter handle AnnotationMethodHandlerAdapter java 409  at org springframework web servlet DispatcherServlet doDispatch DispatcherServlet java 774  at org springframework web servlet DispatcherServlet doService DispatcherServlet java 719  at org springframework web servlet FrameworkServlet processRequest FrameworkServlet java 644  at org springframework web servlet FrameworkServlet doPost FrameworkServlet java 560  at javax servlet http HttpServlet service HttpServlet java 637  at javax servlet http HttpServlet service HttpServlet java 717  at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 290  at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206  at org springframework web filter HiddenHttpMethodFilter doFilterInternal HiddenHttpMethodFilter java 77  at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 76  at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 235  at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206  at org apache catalina core StandardWrapperValve invoke StandardWrapperValve java 233  at org apache catalina core StandardContextValve invoke StandardContextValve java 191  at org apache catalina core StandardHostValve invoke StandardHostValve java 127  at org apache catalina valves ErrorReportValve invoke ErrorReportValve java 102  at org apache catalina core StandardEngineValve invoke StandardEngineValve java 109  at org apache catalina connector CoyoteAdapter service CoyoteAdapter java 298  at org apache coyote http11 Http11Processor process Http11Processor java 857  at org apache coyote http11 Http11Protocol Http11ConnectionHandler process Http11Protocol java 588  at org apache tomcat util net JIoEndpoint Worker run JIoEndpoint java 489  at java lang Thread run Thread java 619    So my questions are    Is it possible to send MultipartFile through RestTemplate using POST  Are there some specific converters that I have to use to send this type of objects  I mean is there some MultipartFileHttpMessageConverter to use in my configuration

User · Answer

MultiValueMap lt String  Object gt  parts   new LinkedMultiValueMap lt String  Object gt     parts add  name 1    value 1    parts add  name 2    value 2 1    parts add  name 2    value 2 2    Resource logo   new ClassPathResource   org springframework http converter logo jpg    parts add  logo   logo   Source xml   new StreamSource new StringReader   lt root gt  lt child  gt  lt  root gt      parts add  xml   xml    template postForLocation  http   example com multipart   parts

User · Answer

If you have to send a multipart file that is composed  among other things  by an Object that needs to be converted with a specific HttpMessageConverter and you get the  no suitable HttpMessageConverter  error no matter what you try  you may want to try with this   RestTemplate restTemplate   new RestTemplate    FormHttpMessageConverter converter   new FormHttpMessageConverter     converter addPartConverter new TheRequiredHttpMessageConverter       for example  in my case it was  new MappingJackson2HttpMessageConverter     restTemplate getMessageConverters   add converter     This solved the problem for me with a custom Object that  together with a file  instanceof FileSystemResource  in my case   was part of the multipart file I needed to send  I tried with TrueGuidance s solution  and many others found around the web  to no avail  then I looked at FormHttpMessageConverter s source code and tried this

User · Answer

You may simply use MultipartHttpServletRequest  Example     RequestMapping value    upload    method   RequestMethod POST produces    text html  charset utf-8     ResponseBody  public String upload MultipartHttpServletRequest request    RequestBody MultipartFile file         String responseMessage    OK       MultipartFile file   request getFile  file        String param   request getParameter  param        try           System out println file getOriginalFilename             System out println  some param     param           BufferedReader bufferedReader   new BufferedReader new InputStreamReader file getInputStream    StandardCharsets UTF 8               read file           catch Exception ex           ex printStackTrace            responseMessage    fail              return responseMessage      Where parameters names in request getParameter   must be same with corresponding frontend names   Note  that file extracted via getFile   while other additional parameters extracted via getParameter

User · Answer

A way to solve this without needing to use a FileSystemResource that requires a file on disk  is to use a ByteArrayResource  that way you can send a byte array in your post  this code works with Spring 3 2 3    MultiValueMap lt String  Object gt  map   new LinkedMultiValueMap lt String  Object gt     final String filename  somefile txt   map add  name   filename   map add  filename   filename   ByteArrayResource contentsAsResource   new ByteArrayResource content getBytes  UTF-8                  Override             public String getFilename                    return filename                           map add  file   contentsAsResource   String result   restTemplate postForObject urlForFacade  map  String class     I override the getFilename of the ByteArrayResource because if I don t I get a null pointer exception  apparently it depends on whether the java activation  jar is on the classpath  if it is  it will use the file name to try to determine the content type

User · Answer

One of our guys does something similar with the filesystemresource  try   mvm add  file   new FileSystemResource pUploadDTO getFile         assuming the output of your  getFile is a java File object  that should work the same as ours  which  just has a File parameter

User · Answer

I had to do the same thing that  Luxspes did above  and I am using Spring 4 2 6  Spent quite some time figuring why is ByteArrayResource getting transferred from client to server  but the server is not recognizing it    ByteArrayResource contentsAsResource   new ByteArrayResource byteArr                Override             public String getFilename                    return filename

User · Answer

You have to add the FormHttpMessageConverter to your applicationContext xml to be able to post multipart files    lt bean id  restTemplate  class  org springframework web client RestTemplate  gt       lt property name  messageConverters  gt           lt list gt               lt bean class  org springframework http converter StringHttpMessageConverter    gt               lt bean class  org springframework http converter FormHttpMessageConverter    gt           lt  list gt       lt  property gt   lt  bean gt    See http   docs spring io spring-framework docs current javadoc-api org springframework http converter FormHttpMessageConverter html for examples

User · Answer

I recently struggled with this issue for 3 days  How the client is sending the request might not be the cause  the server might not be configured to handle multipart requests  This is what I had to do to get it working   pom xml - Added commons-fileupload dependency  download and add the jar to your project if you are not using dependency management such as maven    lt dependency gt     lt groupId gt commons-fileupload lt  groupId gt     lt artifactId gt commons-fileupload lt  artifactId gt     lt version gt   commons-version  lt  version gt   lt  dependency gt    web xml - Add multipart filter and mapping   lt filter gt     lt filter-name gt multipartFilter lt  filter-name gt     lt filter-class gt org springframework web multipart support MultipartFilter lt  filter-class gt   lt  filter gt   lt filter-mapping gt     lt filter-name gt multipartFilter lt  filter-name gt     lt url-pattern gt  springrest   lt  url-pattern gt   lt  filter-mapping gt    app-context xml - Add multipart resolver   lt beans bean id  multipartResolver  class  org springframework web multipart commons CommonsMultipartResolver  gt       lt beans property name  maxUploadSize  gt           lt beans value gt 10000000 lt  beans value gt       lt  beans property gt   lt  beans bean gt    Your Controller   RequestMapping value Constants REQUEST MAPPING ADD IMAGE  method   RequestMethod POST  produces      application json    public  ResponseBody boolean saveStationImage           RequestParam value   Constants MONGO STATION PROFILE IMAGE FILE  MultipartFile file           RequestParam value   Constants MONGO STATION PROFILE IMAGE URI  String imageUri            RequestParam value   Constants MONGO STATION PROFILE IMAGE TYPE  String imageType            RequestParam value   Constants MONGO FIELD STATION ID  String stationId           Do something with file        Return results     Your client  public static Boolean updateStationImage StationImage stationImage        if stationImage    null            Log w TAG     updateStationImage    Station Image object is null  returning             return null             Log d TAG   Uploading      stationImage getImageUri         try           RestTemplate restTemplate   new RestTemplate            FormHttpMessageConverter formConverter   new FormHttpMessageConverter            formConverter setCharset Charset forName  UTF8             restTemplate getMessageConverters   add formConverter           restTemplate getMessageConverters   add new MappingJackson2HttpMessageConverter              restTemplate setRequestFactory new HttpComponentsClientHttpRequestFactory              HttpHeaders httpHeaders   new HttpHeaders            httpHeaders setAccept Collections singletonList MediaType parseMediaType  application json               MultiValueMap lt String  Object gt  parts   new LinkedMultiValueMap lt String  Object gt              parts add Constants STATION PROFILE IMAGE FILE  new FileSystemResource stationImage getImageFile              parts add Constants STATION PROFILE IMAGE URI  stationImage getImageUri             parts add Constants STATION PROFILE IMAGE TYPE  stationImage getImageType             parts add Constants FIELD STATION ID  stationImage getStationId              return restTemplate postForObject Constants REST CLIENT URL ADD IMAGE  parts  Boolean class         catch  Exception e            StringWriter sw   new StringWriter            e printStackTrace new PrintWriter sw             Log e TAG     addStationImage   sw toString                return false      That should do the trick  I added as much information as possible because I spent days  piecing together bits and pieces of the full issue  I hope this will help

User · Answer

I had this issue and found a much simpler solution than using a ByteArrayResource   Simply do   public void loadInvoices MultipartFile invoices  String channel  throws IOException        init         Resource invoicesResource   invoices getResource         LinkedMultiValueMap lt String  Object gt  parts   new LinkedMultiValueMap lt  gt         parts add  file   invoicesResource        HttpHeaders httpHeaders   new HttpHeaders        httpHeaders setContentType MediaType MULTIPART FORM DATA       httpHeaders set  channel   channel        HttpEntity lt LinkedMultiValueMap lt String  Object gt  gt  httpEntity   new HttpEntity lt  gt  parts  httpHeaders        String url   String format   s rest inbound invoices upload   baseUrl        restTemplate postForEntity url  httpEntity  JobData class       It works  and no messing around with the file system or byte arrays

User · Answer

I also ran into the same issue the other day  Google search got me here and several other places  but none gave the solution to this issue   I ended up saving the uploaded file  MultiPartFile  as a tmp file  then use FileSystemResource to upload it via RestTemplate  Here s the code I use   String tempFileName     tmp     multiFile getOriginalFileName    FileOutputStream fo   new FileOutputStream tempFileName    fo write asset getBytes         fo close        parts add  file   new FileSystemResource tempFileName        String response   restTemplate postForObject uploadUrl  parts  String class  authToken  path          clean-up     File f   new File tempFileName       f delete      I am still looking for a more elegant solution to this problem

[spring-mvc] Sending Multipart File as POST parameters with RestTemplate requests

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