Spring: @ModelAttribute VS @RequestBody

Question

Please correct me if I am wrong. Both can be used for Data Binding.

The question is when to use @ModelAttribute?

@RequestMapping(val         


        

Answer 1

If you want to do file upload, you have to use @ModelAttribute. With @RequestBody, it's not possible. Sample code

@RestController
@RequestMapping(ProductController.BASE_URL)
public class ProductController {

    public static final String BASE_URL = "/api/v1/products";

    private ProductService productService;

    public ProductController(ProductService productService) {
        this.productService = productService;
    }

    @PostMapping
    @ResponseStatus(HttpStatus.CREATED)
    public ProductDTO createProduct(@Valid @ModelAttribute ProductInput productInput) {
        return productService.createProduct(productInput);
    }

}

ProductInput class

@Data
public class ProductInput {

    @NotEmpty(message = "Please provide a name")
    @Size(min = 2, max = 250, message = "Product name should be minimum 2 character and maximum 250 character")
    private String name;

    @NotEmpty(message = "Please provide a product description")
    @Size(min = 2, max = 5000, message = "Product description should be minimum 2 character and maximum 5000 character")
    private String details;

    @Min(value = 0, message = "Price should not be negative")
    private float price;

    @Size(min = 1, max = 10, message = "Product should have minimum 1 image and maximum 10 images")
    private Set<MultipartFile> images;
}