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react + spring boot upload file and form data

i have a case like in my form (front end), i can fill personal data (name, address, DOB) and then i can attach multiple image.

In my spring boot controller :

@RequestMapping(value = "/addCustOrder", method = RequestMethod.POST, consumes = {"multipart/form-data"})
    public String CustomerOrder(@ModelAttribute CustOrderRequest coReq, HttpServletRequest request) {
    System.out.println("debug ************** ");
    System.out.println("ReceiverName :: " + coReq.getReceiverName());
    System.out.println("attachmentFile :: " + coReq.getFileAttachment().length);

My model wrapper :

public class CustOrderRequest {
    private String receiverName;
    private String receiverPhone;
    private String itemDescription;
    private MultipartFile[] fileAttachment;
//setter & getter 

Front end (React) Code :

const payload = JSON.stringify({
    receiverName: values.receiverName,
    receiverPhone: values.receiverPhone,
    itemDescription: values.itemDescription,
    fileAttachment: values.fileAttachment
});, payload)
    .then(r => {
    // success request 

With above example, i always encounter errors. like : Stream closed and zero attachment length / zero attachment size (have switch from array of MultipartFile or List of MultipartFile). please throw some light for this case, as a lot of tutorial out there only for upload the attachment part, not including the form data that user has filled. Thanks before.

tutorial reference : SO MK

Updated front end code :

let fd = new FormData();
fd.append("fileAttachment", values.fileAttachment);
fd.append("receiverName", values.receiverName);, fd)
    .then(r => {
    // success request 

changed the front end code using formdata then got error in backend :

2020-02-07T17:36:10.231+0700 WARN Resolved [org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors
Field error in object 'custOrderRequest' on field 'fileAttachment': rejected value [[object FileList]]; codes [typeMismatch.custOrderRequest.fileAttachment,typeMismatch.fileAttachment,typeMismatch.[Lorg.springframework.web.multipart.MultipartFile;,typeMismatch]; arguments [ codes [custOrderRequest.fileAttachment,fileAttachment]; arguments []; default message [fileAttachment]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'org.springframework.web.multipart.MultipartFile[]' for property 'fileAttachment'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'org.springframework.web.multipart.MultipartFile' for property 'fileAttachment[0]': no matching editors or conversion strategy found]]




First Exception Solution

You are consuming multipart/form-data in your server-side, so you must send data as formData.

Use const formData = new FormData(form); instead of JSON.stringify

Second Exception Solution

Your second exception is for the binding error, you’re trying to bind String into Multipart, it is because of this line

fd.append("fileAttachment", values.fileAttachment);

1- You can set an onChange in the form for file, like onFileChangeHandler

<input type="file" className="form-control" name="file" onChange={this.onFileChangeHandler}/>

2- Set uploaded file in formData and send it (like below code)

Body of onChange can be as follows

onFileChangeHandler = (e) => {
        const formData = new FormData();
        formData.append('file', this.state.selectedFile);
        //Append the rest data then send
           method: 'post',
           url: 'myurl',
           data: formData,
           headers: {'Content-Type': 'multipart/form-data' }
        .then(function (response) {
           //handle success
        function(error) { 
           // handle error 

below link might be useful for your case:

File Upload with React Js (Axios) and Spring REST