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Multipart File upload Spring Boot

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栀梦
栀梦 2020-11-29 23:48

Im using Spring Boot and want to use a Controller to receive a multipart file upload. When sending the file I keep getting the error 415 unsupported content type

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6条回答
  • 温柔的废话
    2020-11-30 00:23 
    @RequestBody MultipartFile[] submissions

    should be 

    @RequestParam("file") MultipartFile[] submissions

    The files are not the request body, they are part of it and there is no built-in HttpMessageConverter that can convert the request to an array of MultiPartFile.

    You can also replace HttpServletRequest with MultipartHttpServletRequest, which gives you access to the headers of the individual parts.

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  • 时光说笑
    2020-11-30 00:31

    In Controller, your method should be;

    @RequestMapping(value = "/upload", method = RequestMethod.POST)
    public ResponseEntity<SaveResponse> uploadAttachment(@RequestParam("file") MultipartFile file, HttpServletRequest request) {
....

    Further, you need to update application.yml (or application.properties) to support maximum file size and request size.

    spring:
    http:
        multipart:
            max-file-size: 5MB
            max-request-size: 20MB
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  • 没有蜡笔的小新
    2020-11-30 00:33 
       @Bean
    MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        factory.setMaxFileSize("5120MB");
        factory.setMaxRequestSize("5120MB");
        return factory.createMultipartConfig();
    }

    put it in class where you are defining beans

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  • 甜味超标
    2020-11-30 00:33 
    @RequestMapping(value="/add/image", method=RequestMethod.POST)
public ResponseEntity upload(@RequestParam("id") Long id, HttpServletResponse response, HttpServletRequest request)
{   
    try {
        MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest)request;
        Iterator<String> it=multipartRequest.getFileNames();
        MultipartFile multipart=multipartRequest.getFile(it.next());
        String fileName=id+".png";
        String imageName = fileName;

        byte[] bytes=multipart.getBytes();
        BufferedOutputStream stream= new BufferedOutputStream(new FileOutputStream("src/main/resources/static/image/book/"+fileName));;

        stream.write(bytes);
        stream.close();
        return new ResponseEntity("upload success", HttpStatus.OK);

    } catch (Exception e) {
        e.printStackTrace();
        return new ResponseEntity("Upload fialed", HttpStatus.BAD_REQUEST);
    }   
}
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  • 旧时难觅i
    2020-11-30 00:34

    You can simply use a controller method like this:

    @RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
@ResponseBody
public ResponseEntity<?> uploadFile(
    @RequestParam("file") MultipartFile file) {

  try {
    // Handle the received file here
    // ...
  }
  catch (Exception e) {
    return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
  }

  return new ResponseEntity<>(HttpStatus.OK);
} // method uploadFile

    Without any additional configurations for Spring Boot.

    Using the following html form client side:

    <html>
<body>
  <form action="/uploadFile" method="POST" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit" value="Upload"> 
  </form>
</body>
</html>

    If you want to set limits on files size you can do it in the application.properties:

    # File size limit
multipart.maxFileSize = 3Mb

# Total request size for a multipart/form-data
multipart.maxRequestSize = 20Mb

    Moreover to send the file with Ajax take a look here: http://blog.netgloo.com/2015/02/08/spring-boot-file-upload-with-ajax/

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  • 面向向阳花
    2020-11-30 00:43

    Latest version of SpringBoot makes uploading multiple files very easy also. On the browser side you just need the standard HTML upload form, but with multiple input elements (one per file to upload, which is very important), all having the same element name (name="files" for the example below)

    Then in your Spring @Controller class on the server all you need is something like this:

    @RequestMapping(value = "/upload", method = RequestMethod.POST)
    public @ResponseBody ResponseEntity<?> upload(
        @RequestParam("files") MultipartFile[] uploadFiles) throws Exception     
{
    ...now loop over all uploadFiles in the array and do what you want
  return new ResponseEntity<>(HttpStatus.OK);
}

    Those are the tricky parts. That is, knowing to create multiple input elements each named "files", and knowing to use a MultipartFile[] (array) as the request parameter are the tricky things to know, but it's just that simple. I won't get into how to process a MultipartFile entry, because there's plenty of docs on that already.

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