com.fasterxml.jackson.databind.exc.InvalidDefinitionException：无法构造`org.springframework.web.multipart.MultipartFile`的实例

Question

I'm trying to access an uploaded file from the spring boot controller, but I'm getting error

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of springframework.web.multipart.MultipartFile

FormDomain class

public class FormDomain {
     @JsonPropertyDescription
 private MultipartFile fileInput;

public MultipartFile getFileInput() {
    return fileInput;
}

public void setFileInput(MultipartFile fileInput) {
    this.fileInput = fileInput;
}

}

Form Controller Class

@CrossOrigin(origins="*")
@RestController
public class FormController {
      @PostMapping(path="/basicForm")
 public String postResponseController(
              @RequestBody FormDomain loginForm) throws IOException {
         return "file transfer completed successfully";
     }

Angular form

<form #basicForm = "ngForm" (ngSubmit) = "onClickSubmit(basicForm.value)" enctype="multipart/form-data" class="form-horizontal">
    <input type="file" id="file-input" name="fileInput" ngModel (change)="selectFile($event)">
     <button type="submit"> Submit</button>
 </form>

Select File method

 selectFile(event) {
    this.selectedFiles = event.target.files[0];
    console.log(this.selectedFiles);
    }

Angular method that submits form

   onClickSubmit(data) {
             data.fileInput=this.selectedFiles;
        this.http.post("http://localhost:8080/basicForm", data).subscribe( (ob)=>(console.log("subscribe method called")));

  }

How to solve this issue?

Answer 1

That is Not possible with RequestBody annotation.

You can achive with using like below.

public String postResponseController(@RequestParam("multipartFile") MultipartFile multipartFile) throws IOException {
//do somthing
}

I hope this will helpful for you.