Upload multiple files using ajax and spring mvc
I am trying to upload multile files using FormData and spring.
HTML:
<input type="file" name="img" multiple id="upload-files">
JS code:
var ajaxData = new FormData();
var files = $('#upload-files').prop('files');
for(var i=0;i<files.length;i++){
ajaxData.append('file['+i+']', files[i]);
}
ajaxData.append("file", files);
$http.post('../rest/upload', ajaxData, {
headers: {'Content-Type': undefined },
transformRequest: angular.identity
});
Spring Controller code:
@RequestMapping(value = "/upload", produces="application/json", method = RequestMethod.POST)
@ResponseBody
public String upload(
@RequestParam ArrayList<MultipartFile> files
){
System.out.println(files.size());
return null;
}
However, count of files is coming out to be 0 on submitting the request with multiple files. On using array notation MultipartFile[] files instead of ArrayList , it gives 400, Bad Request.
How to make spring controller work with multiple files? I am unable to find solution on other SO questions.
By default, the DataBinder tries to bind request parameters to target object with convention - the parameter names from the request (the FormData in your case) and in the controller's action must match.
In your case you should rename file[i] to files[i] :
for(var i=0; i < files.length; i++){
ajaxData.append('files[' + i + ']', files[i]);
}
OR rename action's parameter from ArrayList<MultipartFile> files to ArrayList<MultipartFile> file
Also, delete this line ajaxData.append("file", files); (which is right after the for loop), because it is setting a parameter with the same name and some kind of glitch can occur.
Hope this helps.
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